fix: code validator false positives and null property removal (#294, #293, #611) (#637)

- Fix $() node reference triggering "Invalid $ usage" warning by adding ( and _ to regex lookahead
- Fix helper function primitive returns triggering "Cannot return primitive values" error
- Fix null values in diff engine causing Zod validation errors — null now deletes properties
- Update property removal docs from undefined to null

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/dependency-check.yml

@@ -59,7 +59,9 @@ jobs:
         run: |
           npm init -y
           # Install from tarball WITHOUT lockfile (simulates npm install n8n-mcp)
-          npm install ./n8n-mcp-*.tgz
+          # Use --ignore-scripts to skip native compilation of transitive deps like isolated-vm
+          # (n8n-mcp only reads node metadata, it doesn't execute n8n nodes at runtime)
+          npm install --ignore-scripts ./n8n-mcp-*.tgz
 
       - name: Verify critical dependency versions
         working-directory: /tmp/fresh-install-test
@@ -75,15 +77,15 @@ jobs:
           echo "Zod version: $ZOD_VERSION"
           echo ""
 
-          # Check MCP SDK version - must be exactly 1.20.1
+          # Check MCP SDK version - must be exactly 1.27.1
           if [[ "$SDK_VERSION" == "not found" ]]; then
             echo "❌ FAILED: Could not determine MCP SDK version!"
             echo "   The dependency may not have been installed correctly."
             exit 1
           fi
-          if [[ "$SDK_VERSION" != "1.20.1" ]]; then
+          if [[ "$SDK_VERSION" != "1.27.1" ]]; then
             echo "❌ FAILED: MCP SDK version mismatch!"
-            echo "   Expected: 1.20.1"
+            echo "   Expected: 1.27.1"
             echo "   Got: $SDK_VERSION"
             echo ""
             echo "This can cause runtime errors. See issues #440, #444, #446, #447, #450"
@@ -98,7 +100,7 @@ jobs:
             exit 1
           fi
           if [[ "$ZOD_VERSION" =~ ^4\. ]]; then
-            echo "❌ FAILED: Zod v4 detected - incompatible with MCP SDK 1.20.1!"
+            echo "❌ FAILED: Zod v4 detected - incompatible with MCP SDK 1.27.1!"
             echo "   Expected: 3.x"
             echo "   Got: $ZOD_VERSION"
             echo ""

.github/workflows/docker-build.yml

@@ -53,13 +53,24 @@ jobs:
     permissions:
       contents: read
       packages: write
-      
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           lfs: true
-        
+
+      - name: Sync runtime version
+        run: |
+          VERSION=$(node -p "require('./package.json').version")
+          node -e "
+            const fs = require('fs');
+            const pkg = JSON.parse(fs.readFileSync('package.runtime.json'));
+            pkg.version = '$VERSION';
+            fs.writeFileSync('package.runtime.json', JSON.stringify(pkg, null, 2) + '\n');
+          "
+          echo "✅ Synced package.runtime.json to version $VERSION"
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
         
@@ -144,13 +155,24 @@ jobs:
     permissions:
       contents: read
       packages: write
-      
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           lfs: true
-        
+
+      - name: Sync runtime version
+        run: |
+          VERSION=$(node -p "require('./package.json').version")
+          node -e "
+            const fs = require('fs');
+            const pkg = JSON.parse(fs.readFileSync('package.runtime.json'));
+            pkg.version = '$VERSION';
+            fs.writeFileSync('package.runtime.json', JSON.stringify(pkg, null, 2) + '\n');
+          "
+          echo "✅ Synced package.runtime.json to version $VERSION"
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
         

.github/workflows/release.yml

@@ -283,8 +283,8 @@ jobs:
       - name: Install dependencies
         run: npm ci
       
-      - name: Build project
-        run: npm run build
+      - name: Build project (server + UI apps)
+        run: npm run build:all
 
       # Database is already built and committed during development
       # Rebuilding here causes segfault due to memory pressure (exit code 139)
@@ -322,8 +322,8 @@ jobs:
       - name: Install dependencies
         run: npm ci
       
-      - name: Build project
-        run: npm run build
+      - name: Build project (server + UI apps)
+        run: npm run build:all
 
       # Database is already built and committed during development
       - name: Verify database exists
@@ -347,6 +347,8 @@ jobs:
           # Copy necessary files
           cp -r dist $PUBLISH_DIR/
           cp -r data $PUBLISH_DIR/
+          mkdir -p $PUBLISH_DIR/ui-apps
+          cp -r ui-apps/dist $PUBLISH_DIR/ui-apps/
           cp README.md $PUBLISH_DIR/
           cp LICENSE $PUBLISH_DIR/
           cp .env.example $PUBLISH_DIR/
@@ -377,7 +379,7 @@ jobs:
           pkg.license = 'MIT';
           pkg.bugs = { url: 'https://github.com/czlonkowski/n8n-mcp/issues' };
           pkg.homepage = 'https://github.com/czlonkowski/n8n-mcp#readme';
-          pkg.files = ['dist/**/*', 'data/nodes.db', '.env.example', 'README.md', 'LICENSE'];
+          pkg.files = ['dist/**/*', 'ui-apps/dist/**/*', 'data/nodes.db', '.env.example', 'README.md', 'LICENSE'];
           delete pkg.private;
           require('fs').writeFileSync('./package.json', JSON.stringify(pkg, null, 2));
           "
@@ -427,7 +429,18 @@ jobs:
             exit 1
           fi
           echo "✅ Sufficient disk space: ${AVAILABLE_GB}GB available"
-      
+
+      - name: Sync runtime version for Docker
+        run: |
+          VERSION=$(node -p "require('./package.json').version")
+          node -e "
+            const fs = require('fs');
+            const pkg = JSON.parse(fs.readFileSync('package.runtime.json'));
+            pkg.version = '$VERSION';
+            fs.writeFileSync('package.runtime.json', JSON.stringify(pkg, null, 2) + '\n');
+          "
+          echo "✅ Synced package.runtime.json to version $VERSION"
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       

.gitignore

@@ -138,5 +138,9 @@ n8n-mcp-wrapper.sh
 # MCP configuration files
 .mcp.json
 
+# UI Apps build output
+ui-apps/dist/
+ui-apps/node_modules/
+
 # Telemetry configuration (user-specific)
 ~/.n8n-mcp/

Dockerfile

@@ -14,7 +14,7 @@ RUN --mount=type=cache,target=/root/.npm \
     echo '{}' > package.json && \
     npm install --no-save typescript@^5.8.3 @types/node@^22.15.30 @types/express@^5.0.3 \
         @modelcontextprotocol/sdk@1.20.1 dotenv@^16.5.0 express@^5.1.0 axios@^1.10.0 \
-        n8n-workflow@^1.96.0 uuid@^11.0.5 @types/uuid@^10.0.0 \
+        n8n-workflow@^2.4.2 uuid@^11.0.5 @types/uuid@^10.0.0 \
         openai@^4.77.0 zod@3.24.1 lru-cache@^11.2.1 @supabase/supabase-js@^2.57.4
 
 # Copy source and build

MEMORY_N8N_UPDATE.md

@@ -18,21 +18,27 @@ npm run update:n8n:check
 # 4. Run update and skip tests (we'll test in CI)
 yes y | npm run update:n8n
 
-# 5. Create feature branch
+# 5. Refresh community nodes (standard practice!)
+npm run fetch:community
+npm run generate:docs
+
+# 6. Create feature branch
 git checkout -b update/n8n-X.X.X
 
-# 6. Update version in package.json (must be HIGHER than latest release!)
+# 7. Update version in package.json (must be HIGHER than latest release!)
 # Edit: "version": "2.XX.X" (not the version from the release list!)
 
-# 7. Update CHANGELOG.md
+# 8. Update CHANGELOG.md
 # - Change version number to match package.json
 # - Update date to today
 # - Update dependency versions
+# - Include community node refresh counts
 
-# 8. Update README badge
+# 9. Update README badge and node counts
 # Edit line 8: Change n8n version badge to new n8n version
+# Update total node count in description (core + community)
 
-# 9. Commit and push
+# 10. Commit and push
 git add -A
 git commit -m "chore: update n8n to X.X.X and bump version to 2.XX.X
 
@@ -41,7 +47,8 @@ git commit -m "chore: update n8n to X.X.X and bump version to 2.XX.X
 - Updated n8n-workflow from X.X.X to X.X.X
 - Updated @n8n/n8n-nodes-langchain from X.X.X to X.X.X
 - Rebuilt node database with XXX nodes (XXX from n8n-nodes-base, XXX from @n8n/n8n-nodes-langchain)
-- Updated README badge with new n8n version
+- Refreshed community nodes (XXX verified + XXX npm)
+- Updated README badge with new n8n version and node counts
 - Updated CHANGELOG with dependency changes
 
 Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
@@ -52,10 +59,10 @@ Co-Authored-By: Claude <noreply@anthropic.com>"
 
 git push -u origin update/n8n-X.X.X
 
-# 10. Create PR
+# 11. Create PR
 gh pr create --title "chore: update n8n to X.X.X" --body "Updates n8n and all related dependencies to the latest versions..."
 
-# 11. After PR is merged, verify release triggered
+# 12. After PR is merged, verify release triggered
 gh release list | head -1
 # If the new version appears, you're done!
 # If not, the version might have already been released - bump version again and create new PR

README.md

@@ -5,11 +5,11 @@
 [![npm version](https://img.shields.io/npm/v/n8n-mcp.svg)](https://www.npmjs.com/package/n8n-mcp)
 [![codecov](https://codecov.io/gh/czlonkowski/n8n-mcp/graph/badge.svg?token=YOUR_TOKEN)](https://codecov.io/gh/czlonkowski/n8n-mcp)
 [![Tests](https://img.shields.io/badge/tests-3336%20passing-brightgreen.svg)](https://github.com/czlonkowski/n8n-mcp/actions)
-[![n8n version](https://img.shields.io/badge/n8n-2.2.3-orange.svg)](https://github.com/n8n-io/n8n)
+[![n8n version](https://img.shields.io/badge/n8n-2.11.4-orange.svg)](https://github.com/n8n-io/n8n)
 [![Docker](https://img.shields.io/badge/docker-ghcr.io%2Fczlonkowski%2Fn8n--mcp-green.svg)](https://github.com/czlonkowski/n8n-mcp/pkgs/container/n8n-mcp)
 [![Deploy on Railway](https://railway.com/button.svg)](https://railway.com/deploy/n8n-mcp?referralCode=n8n-mcp)
 
-A Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Deploy in minutes to give Claude and other AI assistants deep knowledge about n8n's 1,084 workflow automation nodes (537 core + 547 community).
+A Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Deploy in minutes to give Claude and other AI assistants deep knowledge about n8n's 1,239 workflow automation nodes (809 core + 430 community).
 
 ## Overview
 

dist/constants/type-structures.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"type-structures.d.ts","sourceRoot":"","sources":["../../src/constants/type-structures.ts"],"names":[],"mappings":"AAaA,OAAO,KAAK,EAAE,iBAAiB,EAAE,MAAM,cAAc,CAAC;AACtD,OAAO,KAAK,EAAE,aAAa,EAAE,MAAM,0BAA0B,CAAC;AAe9D,eAAO,MAAM,eAAe,EAAE,MAAM,CAAC,iBAAiB,EAAE,aAAa,CAilBpE,CAAC;AAUF,eAAO,MAAM,qBAAqB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CA4GjC,CAAC"}
+{"version":3,"file":"type-structures.d.ts","sourceRoot":"","sources":["../../src/constants/type-structures.ts"],"names":[],"mappings":"AAaA,OAAO,KAAK,EAAE,iBAAiB,EAAE,MAAM,cAAc,CAAC;AACtD,OAAO,KAAK,EAAE,aAAa,EAAE,MAAM,0BAA0B,CAAC;AAe9D,eAAO,MAAM,eAAe,EAAE,MAAM,CAAC,iBAAiB,EAAE,aAAa,CAkmBpE,CAAC;AAUF,eAAO,MAAM,qBAAqB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;CA4GjC,CAAC"}

dist/constants/type-structures.js

@@ -545,6 +545,22 @@ exports.TYPE_STRUCTURES = {
             'One-time import feature',
         ],
     },
+    icon: {
+        type: 'primitive',
+        jsType: 'string',
+        description: 'Icon identifier for visual representation',
+        example: 'fa:envelope',
+        examples: ['fa:envelope', 'fa:user', 'fa:cog', 'file:slack.svg'],
+        validation: {
+            allowEmpty: false,
+            allowExpressions: false,
+        },
+        notes: [
+            'References icon by name or file path',
+            'Supports Font Awesome icons (fa:) and file paths (file:)',
+            'Used for visual customization in UI',
+        ],
+    },
 };
 exports.COMPLEX_TYPE_EXAMPLES = {
     collection: {

dist/database/database-adapter.js

@@ -311,6 +311,17 @@ class SQLJSStatement {
         this.stmt = stmt;
         this.onModify = onModify;
         this.boundParams = null;
+        this.freed = false;
+    }
+    freeStatement() {
+        if (!this.freed && this.stmt) {
+            try {
+                this.stmt.free();
+                this.freed = true;
+            }
+            catch (e) {
+            }
+        }
     }
     run(...params) {
         try {
@@ -331,6 +342,9 @@ class SQLJSStatement {
             this.stmt.reset();
             throw error;
         }
+        finally {
+            this.freeStatement();
+        }
     }
     get(...params) {
         try {
@@ -352,6 +366,9 @@ class SQLJSStatement {
             this.stmt.reset();
             throw error;
         }
+        finally {
+            this.freeStatement();
+        }
     }
     all(...params) {
         try {
@@ -372,6 +389,9 @@ class SQLJSStatement {
             this.stmt.reset();
             throw error;
         }
+        finally {
+            this.freeStatement();
+        }
     }
     iterate(...params) {
         return this.all(...params)[Symbol.iterator]();

dist/database/node-repository.d.ts

@@ -1,10 +1,20 @@
 import { DatabaseAdapter } from './database-adapter';
 import { ParsedNode } from '../parsers/node-parser';
 import { SQLiteStorageService } from '../services/sqlite-storage-service';
+export interface CommunityNodeFields {
+    isCommunity: boolean;
+    isVerified: boolean;
+    authorName?: string;
+    authorGithubUrl?: string;
+    npmPackageName?: string;
+    npmVersion?: string;
+    npmDownloads?: number;
+    communityFetchedAt?: string;
+}
 export declare class NodeRepository {
     private db;
     constructor(dbOrService: DatabaseAdapter | SQLiteStorageService);
-    saveNode(node: ParsedNode): void;
+    saveNode(node: ParsedNode & Partial<CommunityNodeFields>): void;
     getNode(nodeType: string): any;
     getAITools(): any[];
     private safeJsonParse;
@@ -29,6 +39,30 @@ export declare class NodeRepository {
     getAllResources(): Map<string, any[]>;
     getNodePropertyDefaults(nodeType: string): Record<string, any>;
     getDefaultOperationForResource(nodeType: string, resource?: string): string | undefined;
+    getCommunityNodes(options?: {
+        verified?: boolean;
+        limit?: number;
+        orderBy?: 'downloads' | 'name' | 'updated';
+    }): any[];
+    getCommunityStats(): {
+        total: number;
+        verified: number;
+        unverified: number;
+    };
+    hasNodeByNpmPackage(npmPackageName: string): boolean;
+    getNodeByNpmPackage(npmPackageName: string): any | null;
+    deleteCommunityNodes(): number;
+    updateNodeReadme(nodeType: string, readme: string): void;
+    updateNodeAISummary(nodeType: string, summary: object): void;
+    getCommunityNodesWithoutReadme(): any[];
+    getCommunityNodesWithoutAISummary(): any[];
+    getDocumentationStats(): {
+        total: number;
+        withReadme: number;
+        withAISummary: number;
+        needingReadme: number;
+        needingAISummary: number;
+    };
     saveNodeVersion(versionData: {
         nodeType: string;
         version: string;

dist/database/node-repository.d.ts.map

@@ -1 +1 @@
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dist/database/node-repository.js

@@ -19,10 +19,12 @@ class NodeRepository {
         is_webhook, is_versioned, is_tool_variant, tool_variant_of,
         has_tool_variant, version, documentation,
         properties_schema, operations, credentials_required,
-        outputs, output_names
-      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+        outputs, output_names,
+        is_community, is_verified, author_name, author_github_url,
+        npm_package_name, npm_version, npm_downloads, community_fetched_at
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     `);
-        stmt.run(node.nodeType, node.packageName, node.displayName, node.description, node.category, node.style, node.isAITool ? 1 : 0, node.isTrigger ? 1 : 0, node.isWebhook ? 1 : 0, node.isVersioned ? 1 : 0, node.isToolVariant ? 1 : 0, node.toolVariantOf || null, node.hasToolVariant ? 1 : 0, node.version, node.documentation || null, JSON.stringify(node.properties, null, 2), JSON.stringify(node.operations, null, 2), JSON.stringify(node.credentials, null, 2), node.outputs ? JSON.stringify(node.outputs, null, 2) : null, node.outputNames ? JSON.stringify(node.outputNames, null, 2) : null);
+        stmt.run(node.nodeType, node.packageName, node.displayName, node.description, node.category, node.style, node.isAITool ? 1 : 0, node.isTrigger ? 1 : 0, node.isWebhook ? 1 : 0, node.isVersioned ? 1 : 0, node.isToolVariant ? 1 : 0, node.toolVariantOf || null, node.hasToolVariant ? 1 : 0, node.version, node.documentation || null, JSON.stringify(node.properties, null, 2), JSON.stringify(node.operations, null, 2), JSON.stringify(node.credentials, null, 2), node.outputs ? JSON.stringify(node.outputs, null, 2) : null, node.outputNames ? JSON.stringify(node.outputNames, null, 2) : null, node.isCommunity ? 1 : 0, node.isVerified ? 1 : 0, node.authorName || null, node.authorGithubUrl || null, node.npmPackageName || null, node.npmVersion || null, node.npmDownloads || 0, node.communityFetchedAt || null);
     }
     getNode(nodeType) {
         const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(nodeType);
@@ -37,6 +39,14 @@ class NodeRepository {
                 return this.parseNodeRow(originalRow);
             }
         }
+        if (!row) {
+            const caseInsensitiveRow = this.db.prepare(`
+        SELECT * FROM nodes WHERE LOWER(node_type) = LOWER(?)
+      `).get(nodeType);
+            if (caseInsensitiveRow) {
+                return this.parseNodeRow(caseInsensitiveRow);
+            }
+        }
         if (!row)
             return null;
         return this.parseNodeRow(row);
@@ -214,7 +224,20 @@ class NodeRepository {
             credentials: this.safeJsonParse(row.credentials_required, []),
             hasDocumentation: !!row.documentation,
             outputs: row.outputs ? this.safeJsonParse(row.outputs, null) : null,
-            outputNames: row.output_names ? this.safeJsonParse(row.output_names, null) : null
+            outputNames: row.output_names ? this.safeJsonParse(row.output_names, null) : null,
+            isCommunity: Number(row.is_community) === 1,
+            isVerified: Number(row.is_verified) === 1,
+            authorName: row.author_name || null,
+            authorGithubUrl: row.author_github_url || null,
+            npmPackageName: row.npm_package_name || null,
+            npmVersion: row.npm_version || null,
+            npmDownloads: row.npm_downloads || 0,
+            communityFetchedAt: row.community_fetched_at || null,
+            npmReadme: row.npm_readme || null,
+            aiDocumentationSummary: row.ai_documentation_summary
+                ? this.safeJsonParse(row.ai_documentation_summary, null)
+                : null,
+            aiSummaryGeneratedAt: row.ai_summary_generated_at || null,
         };
     }
     getNodeOperations(nodeType, resource) {
@@ -360,6 +383,98 @@ class NodeRepository {
         }
         return undefined;
     }
+    getCommunityNodes(options) {
+        let sql = 'SELECT * FROM nodes WHERE is_community = 1';
+        const params = [];
+        if (options?.verified !== undefined) {
+            sql += ' AND is_verified = ?';
+            params.push(options.verified ? 1 : 0);
+        }
+        switch (options?.orderBy) {
+            case 'downloads':
+                sql += ' ORDER BY npm_downloads DESC';
+                break;
+            case 'updated':
+                sql += ' ORDER BY community_fetched_at DESC';
+                break;
+            case 'name':
+            default:
+                sql += ' ORDER BY display_name';
+        }
+        if (options?.limit) {
+            sql += ' LIMIT ?';
+            params.push(options.limit);
+        }
+        const rows = this.db.prepare(sql).all(...params);
+        return rows.map(row => this.parseNodeRow(row));
+    }
+    getCommunityStats() {
+        const totalResult = this.db.prepare('SELECT COUNT(*) as count FROM nodes WHERE is_community = 1').get();
+        const verifiedResult = this.db.prepare('SELECT COUNT(*) as count FROM nodes WHERE is_community = 1 AND is_verified = 1').get();
+        return {
+            total: totalResult.count,
+            verified: verifiedResult.count,
+            unverified: totalResult.count - verifiedResult.count
+        };
+    }
+    hasNodeByNpmPackage(npmPackageName) {
+        const result = this.db.prepare('SELECT 1 FROM nodes WHERE npm_package_name = ? LIMIT 1').get(npmPackageName);
+        return !!result;
+    }
+    getNodeByNpmPackage(npmPackageName) {
+        const row = this.db.prepare('SELECT * FROM nodes WHERE npm_package_name = ?').get(npmPackageName);
+        if (!row)
+            return null;
+        return this.parseNodeRow(row);
+    }
+    deleteCommunityNodes() {
+        const result = this.db.prepare('DELETE FROM nodes WHERE is_community = 1').run();
+        return result.changes;
+    }
+    updateNodeReadme(nodeType, readme) {
+        const stmt = this.db.prepare(`
+      UPDATE nodes SET npm_readme = ? WHERE node_type = ?
+    `);
+        stmt.run(readme, nodeType);
+    }
+    updateNodeAISummary(nodeType, summary) {
+        const stmt = this.db.prepare(`
+      UPDATE nodes
+      SET ai_documentation_summary = ?, ai_summary_generated_at = datetime('now')
+      WHERE node_type = ?
+    `);
+        stmt.run(JSON.stringify(summary), nodeType);
+    }
+    getCommunityNodesWithoutReadme() {
+        const rows = this.db.prepare(`
+      SELECT * FROM nodes
+      WHERE is_community = 1 AND (npm_readme IS NULL OR npm_readme = '')
+      ORDER BY npm_downloads DESC
+    `).all();
+        return rows.map(row => this.parseNodeRow(row));
+    }
+    getCommunityNodesWithoutAISummary() {
+        const rows = this.db.prepare(`
+      SELECT * FROM nodes
+      WHERE is_community = 1
+        AND npm_readme IS NOT NULL AND npm_readme != ''
+        AND (ai_documentation_summary IS NULL OR ai_documentation_summary = '')
+      ORDER BY npm_downloads DESC
+    `).all();
+        return rows.map(row => this.parseNodeRow(row));
+    }
+    getDocumentationStats() {
+        const total = this.db.prepare('SELECT COUNT(*) as count FROM nodes WHERE is_community = 1').get().count;
+        const withReadme = this.db.prepare("SELECT COUNT(*) as count FROM nodes WHERE is_community = 1 AND npm_readme IS NOT NULL AND npm_readme != ''").get().count;
+        const withAISummary = this.db.prepare("SELECT COUNT(*) as count FROM nodes WHERE is_community = 1 AND ai_documentation_summary IS NOT NULL AND ai_documentation_summary != ''").get().count;
+        return {
+            total,
+            withReadme,
+            withAISummary,
+            needingReadme: total - withReadme,
+            needingAISummary: withReadme - withAISummary
+        };
+    }
     saveNodeVersion(versionData) {
         const stmt = this.db.prepare(`
       INSERT OR REPLACE INTO node_versions (

dist/http-server-single-session.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"http-server-single-session.d.ts","sourceRoot":"","sources":["../src/http-server-single-session.ts"],"names":[],"mappings":";AAMA,OAAO,OAAO,MAAM,SAAS,CAAC;AAoB9B,OAAO,EAAE,eAAe,EAA2B,MAAM,0BAA0B,CAAC;AACpF,OAAO,EAAE,YAAY,EAAE,MAAM,uBAAuB,CAAC;AAuErD,qBAAa,uBAAuB;IAElC,OAAO,CAAC,UAAU,CAA8D;IAChF,OAAO,CAAC,OAAO,CAA0D;IACzE,OAAO,CAAC,eAAe,CAAsE;IAC7F,OAAO,CAAC,eAAe,CAA4D;IACnF,OAAO,CAAC,kBAAkB,CAAyC;IACnE,OAAO,CAAC,OAAO,CAAwB;IACvC,OAAO,CAAC,cAAc,CAAwB;IAC9C,OAAO,CAAC,aAAa,CAAM;IAC3B,OAAO,CAAC,cAAc,CAAkB;IACxC,OAAO,CAAC,SAAS,CAAuB;IACxC,OAAO,CAAC,YAAY,CAA+B;;IAcnD,OAAO,CAAC,mBAAmB;IAmB3B,OAAO,CAAC,sBAAsB;YAqChB,aAAa;IAuC3B,OAAO,CAAC,qBAAqB;IAO7B,OAAO,CAAC,gBAAgB;IAkBxB,OAAO,CAAC,gBAAgB;IASxB,OAAO,CAAC,sBAAsB;IAkC9B,OAAO,CAAC,mBAAmB;YASb,oBAAoB;YAwBpB,oBAAoB;IAwBlC,OAAO,CAAC,iBAAiB;IAsBzB,OAAO,CAAC,aAAa;IA2BrB,OAAO,CAAC,mBAAmB;IAoDrB,aAAa,CACjB,GAAG,EAAE,OAAO,CAAC,OAAO,EACpB,GAAG,EAAE,OAAO,CAAC,QAAQ,EACrB,eAAe,CAAC,EAAE,eAAe,GAChC,OAAO,CAAC,IAAI,CAAC;YAmOF,eAAe;IA8C7B,OAAO,CAAC,SAAS;IAYjB,OAAO,CAAC,gBAAgB;IASlB,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;IAgnBtB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IAkD/B,cAAc,IAAI;QAChB,MAAM,EAAE,OAAO,CAAC;QAChB,SAAS,CAAC,EAAE,MAAM,CAAC;QACnB,GAAG,CAAC,EAAE,MAAM,CAAC;QACb,QAAQ,CAAC,EAAE;YACT,KAAK,EAAE,MAAM,CAAC;YACd,MAAM,EAAE,MAAM,CAAC;YACf,OAAO,EAAE,MAAM,CAAC;YAChB,GAAG,EAAE,MAAM,CAAC;YACZ,UAAU,EAAE,MAAM,EAAE,CAAC;SACtB,CAAC;KACH;IAmDM,kBAAkB,IAAI,YAAY,EAAE;IAoEpC,mBAAmB,CAAC,QAAQ,EAAE,YAAY,EAAE,GAAG,MAAM;CAsG7D"}
+{"version":3,"file":"http-server-single-session.d.ts","sourceRoot":"","sources":["../src/http-server-single-session.ts"],"names":[],"mappings":";AAMA,OAAO,OAAO,MAAM,SAAS,CAAC;AAoB9B,OAAO,EAAE,eAAe,EAA2B,MAAM,0BAA0B,CAAC;AACpF,OAAO,EAAE,YAAY,EAAE,MAAM,uBAAuB,CAAC;AAwErD,qBAAa,uBAAuB;IAElC,OAAO,CAAC,UAAU,CAA8D;IAChF,OAAO,CAAC,OAAO,CAA0D;IACzE,OAAO,CAAC,eAAe,CAAsE;IAC7F,OAAO,CAAC,eAAe,CAA4D;IACnF,OAAO,CAAC,kBAAkB,CAAyC;IACnE,OAAO,CAAC,OAAO,CAAwB;IACvC,OAAO,CAAC,cAAc,CAAwB;IAC9C,OAAO,CAAC,aAAa,CAAM;IAI3B,OAAO,CAAC,cAAc,CAER;IACd,OAAO,CAAC,SAAS,CAAuB;IACxC,OAAO,CAAC,YAAY,CAA+B;;IAcnD,OAAO,CAAC,mBAAmB;IAmB3B,OAAO,CAAC,sBAAsB;YAqChB,aAAa;IAuC3B,OAAO,CAAC,qBAAqB;IAO7B,OAAO,CAAC,gBAAgB;IAkBxB,OAAO,CAAC,gBAAgB;IASxB,OAAO,CAAC,sBAAsB;IAkC9B,OAAO,CAAC,mBAAmB;YASb,oBAAoB;YAwBpB,oBAAoB;IAwBlC,OAAO,CAAC,iBAAiB;IAsBzB,OAAO,CAAC,aAAa;IA2BrB,OAAO,CAAC,mBAAmB;IAoDrB,aAAa,CACjB,GAAG,EAAE,OAAO,CAAC,OAAO,EACpB,GAAG,EAAE,OAAO,CAAC,QAAQ,EACrB,eAAe,CAAC,EAAE,eAAe,GAChC,OAAO,CAAC,IAAI,CAAC;YA0PF,eAAe;IA4D7B,OAAO,CAAC,SAAS;IAYjB,OAAO,CAAC,gBAAgB;IASlB,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;IAgnBtB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;IA2D/B,cAAc,IAAI;QAChB,MAAM,EAAE,OAAO,CAAC;QAChB,SAAS,CAAC,EAAE,MAAM,CAAC;QACnB,GAAG,CAAC,EAAE,MAAM,CAAC;QACb,QAAQ,CAAC,EAAE;YACT,KAAK,EAAE,MAAM,CAAC;YACd,MAAM,EAAE,MAAM,CAAC;YACf,OAAO,EAAE,MAAM,CAAC;YAChB,GAAG,EAAE,MAAM,CAAC;YACZ,UAAU,EAAE,MAAM,EAAE,CAAC;SACtB,CAAC;KACH;IAmDM,kBAAkB,IAAI,YAAY,EAAE;IAoEpC,mBAAmB,CAAC,QAAQ,EAAE,YAAY,EAAE,GAAG,MAAM;CAsG7D"}

dist/http-server-single-session.js

@@ -22,6 +22,7 @@ const crypto_1 = require("crypto");
 const types_js_1 = require("@modelcontextprotocol/sdk/types.js");
 const protocol_version_1 = require("./utils/protocol-version");
 const instance_context_1 = require("./types/instance-context");
+const shared_database_1 = require("./database/shared-database");
 dotenv_1.default.config();
 const DEFAULT_PROTOCOL_VERSION = protocol_version_1.STANDARD_PROTOCOL_VERSION;
 const MAX_SESSIONS = Math.max(1, parseInt(process.env.N8N_MCP_MAX_SESSIONS || '100', 10));
@@ -52,7 +53,7 @@ class SingleSessionHTTPServer {
         this.contextSwitchLocks = new Map();
         this.session = null;
         this.consoleManager = new console_manager_1.ConsoleManager();
-        this.sessionTimeout = 30 * 60 * 1000;
+        this.sessionTimeout = parseInt(process.env.SESSION_TIMEOUT_MINUTES || '5', 10) * 60 * 1000;
         this.authToken = null;
         this.cleanupTimer = null;
         this.validateEnvironment();
@@ -290,6 +291,25 @@ class SingleSessionHTTPServer {
                         return;
                     }
                     logger_1.logger.info('handleRequest: Creating new transport for initialize request');
+                    if (instanceContext?.instanceId) {
+                        const sessionsToRemove = [];
+                        for (const [existingSessionId, context] of Object.entries(this.sessionContexts)) {
+                            if (context?.instanceId === instanceContext.instanceId) {
+                                sessionsToRemove.push(existingSessionId);
+                            }
+                        }
+                        for (const oldSessionId of sessionsToRemove) {
+                            if (!this.transports[oldSessionId]) {
+                                continue;
+                            }
+                            logger_1.logger.info('Cleaning up previous session for instance', {
+                                instanceId: instanceContext.instanceId,
+                                oldSession: oldSessionId,
+                                reason: 'instance_reconnect'
+                            });
+                            await this.removeSession(oldSessionId, 'instance_reconnect');
+                        }
+                    }
                     let sessionIdToUse;
                     const isMultiTenantEnabled = process.env.ENABLE_MULTI_TENANT === 'true';
                     const sessionStrategy = process.env.MULTI_TENANT_SESSION_STRATEGY || 'instance';
@@ -434,12 +454,21 @@ class SingleSessionHTTPServer {
     }
     async resetSessionSSE(res) {
         if (this.session) {
+            const sessionId = this.session.sessionId;
+            logger_1.logger.info('Closing previous session for SSE', { sessionId });
+            if (this.session.server && typeof this.session.server.close === 'function') {
+                try {
+                    await this.session.server.close();
+                }
+                catch (serverError) {
+                    logger_1.logger.warn('Error closing server for SSE session', { sessionId, error: serverError });
+                }
+            }
             try {
-                logger_1.logger.info('Closing previous session for SSE', { sessionId: this.session.sessionId });
                 await this.session.transport.close();
             }
-            catch (error) {
-                logger_1.logger.warn('Error closing previous session:', error);
+            catch (transportError) {
+                logger_1.logger.warn('Error closing transport for SSE session', { sessionId, error: transportError });
             }
         }
         try {
@@ -1014,6 +1043,13 @@ class SingleSessionHTTPServer {
                 });
             });
         }
+        try {
+            await (0, shared_database_1.closeSharedDatabase)();
+            logger_1.logger.info('Shared database closed');
+        }
+        catch (error) {
+            logger_1.logger.warn('Error closing shared database:', error);
+        }
         logger_1.logger.info('Single-Session HTTP server shutdown completed');
     }
     getSessionInfo() {

dist/http-server.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"http-server.d.ts","sourceRoot":"","sources":["../src/http-server.ts"],"names":[],"mappings":";AA0CA,wBAAgB,aAAa,IAAI,MAAM,GAAG,IAAI,CAsB7C;AA+DD,wBAAsB,oBAAoB,kBA+dzC;AAGD,OAAO,QAAQ,cAAc,CAAC;IAC5B,UAAU,yBAAyB;QACjC,WAAW,CAAC,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,GAAG,GAAG,OAAO,CAAC,GAAG,CAAC,CAAC;KACpD;CACF"}
+{"version":3,"file":"http-server.d.ts","sourceRoot":"","sources":["../src/http-server.ts"],"names":[],"mappings":";AAiDA,wBAAgB,aAAa,IAAI,MAAM,GAAG,IAAI,CAsB7C;AAmED,wBAAsB,oBAAoB,kBAsezC;AAGD,OAAO,QAAQ,cAAc,CAAC;IAC5B,UAAU,yBAAyB;QACjC,WAAW,CAAC,IAAI,EAAE,MAAM,EAAE,IAAI,EAAE,GAAG,GAAG,OAAO,CAAC,GAAG,CAAC,CAAC;KACpD;CACF"}

dist/http-server.js

@@ -85,6 +85,9 @@ async function shutdown() {
     }
 }
 async function startFixedHTTPServer() {
+    logger_1.logger.warn('DEPRECATION: startFixedHTTPServer() is deprecated as of v2.31.8. ' +
+        'Use SingleSessionHTTPServer which supports SSE streaming. ' +
+        'See: https://github.com/czlonkowski/n8n-mcp/issues/524');
     validateEnvironment();
     const app = (0, express_1.default)();
     const trustProxy = process.env.TRUST_PROXY ? Number(process.env.TRUST_PROXY) : 0;

dist/index.d.ts

@@ -5,6 +5,8 @@ export { N8NDocumentationMCPServer } from './mcp/server';
 export type { InstanceContext } from './types/instance-context';
 export { validateInstanceContext, isInstanceContext } from './types/instance-context';
 export type { SessionState } from './types/session-state';
+export type { UIAppConfig, UIMetadata } from './mcp/ui/types';
+export { UI_APP_CONFIGS } from './mcp/ui/app-configs';
 export type { Tool, CallToolResult, ListToolsResult } from '@modelcontextprotocol/sdk/types.js';
 import N8NMCPEngine from './mcp-engine';
 export default N8NMCPEngine;

dist/index.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAOA,OAAO,EAAE,YAAY,EAAE,YAAY,EAAE,aAAa,EAAE,MAAM,cAAc,CAAC;AACzE,OAAO,EAAE,uBAAuB,EAAE,MAAM,8BAA8B,CAAC;AACvE,OAAO,EAAE,cAAc,EAAE,MAAM,yBAAyB,CAAC;AACzD,OAAO,EAAE,yBAAyB,EAAE,MAAM,cAAc,CAAC;AAGzD,YAAY,EACV,eAAe,EAChB,MAAM,0BAA0B,CAAC;AAClC,OAAO,EACL,uBAAuB,EACvB,iBAAiB,EAClB,MAAM,0BAA0B,CAAC;AAClC,YAAY,EACV,YAAY,EACb,MAAM,uBAAuB,CAAC;AAG/B,YAAY,EACV,IAAI,EACJ,cAAc,EACd,eAAe,EAChB,MAAM,oCAAoC,CAAC;AAG5C,OAAO,YAAY,MAAM,cAAc,CAAC;AACxC,eAAe,YAAY,CAAC"}
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAOA,OAAO,EAAE,YAAY,EAAE,YAAY,EAAE,aAAa,EAAE,MAAM,cAAc,CAAC;AACzE,OAAO,EAAE,uBAAuB,EAAE,MAAM,8BAA8B,CAAC;AACvE,OAAO,EAAE,cAAc,EAAE,MAAM,yBAAyB,CAAC;AACzD,OAAO,EAAE,yBAAyB,EAAE,MAAM,cAAc,CAAC;AAGzD,YAAY,EACV,eAAe,EAChB,MAAM,0BAA0B,CAAC;AAClC,OAAO,EACL,uBAAuB,EACvB,iBAAiB,EAClB,MAAM,0BAA0B,CAAC;AAClC,YAAY,EACV,YAAY,EACb,MAAM,uBAAuB,CAAC;AAG/B,YAAY,EAAE,WAAW,EAAE,UAAU,EAAE,MAAM,gBAAgB,CAAC;AAC9D,OAAO,EAAE,cAAc,EAAE,MAAM,sBAAsB,CAAC;AAGtD,YAAY,EACV,IAAI,EACJ,cAAc,EACd,eAAe,EAChB,MAAM,oCAAoC,CAAC;AAG5C,OAAO,YAAY,MAAM,cAAc,CAAC;AACxC,eAAe,YAAY,CAAC"}

dist/index.js

@@ -3,7 +3,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.isInstanceContext = exports.validateInstanceContext = exports.N8NDocumentationMCPServer = exports.ConsoleManager = exports.SingleSessionHTTPServer = exports.N8NMCPEngine = void 0;
+exports.UI_APP_CONFIGS = exports.isInstanceContext = exports.validateInstanceContext = exports.N8NDocumentationMCPServer = exports.ConsoleManager = exports.SingleSessionHTTPServer = exports.N8NMCPEngine = void 0;
 var mcp_engine_1 = require("./mcp-engine");
 Object.defineProperty(exports, "N8NMCPEngine", { enumerable: true, get: function () { return mcp_engine_1.N8NMCPEngine; } });
 var http_server_single_session_1 = require("./http-server-single-session");
@@ -15,6 +15,8 @@ Object.defineProperty(exports, "N8NDocumentationMCPServer", { enumerable: true,
 var instance_context_1 = require("./types/instance-context");
 Object.defineProperty(exports, "validateInstanceContext", { enumerable: true, get: function () { return instance_context_1.validateInstanceContext; } });
 Object.defineProperty(exports, "isInstanceContext", { enumerable: true, get: function () { return instance_context_1.isInstanceContext; } });
+var app_configs_1 = require("./mcp/ui/app-configs");
+Object.defineProperty(exports, "UI_APP_CONFIGS", { enumerable: true, get: function () { return app_configs_1.UI_APP_CONFIGS; } });
 const mcp_engine_2 = __importDefault(require("./mcp-engine"));
 exports.default = mcp_engine_2.default;
 //# sourceMappingURL=index.js.map

dist/index.js.map

@@ -1 +1 @@
-{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;;AAOA,2CAAyE;AAAhE,0GAAA,YAAY,OAAA;AACrB,2EAAuE;AAA9D,qIAAA,uBAAuB,OAAA;AAChC,2DAAyD;AAAhD,iHAAA,cAAc,OAAA;AACvB,uCAAyD;AAAhD,mHAAA,yBAAyB,OAAA;AAMlC,6DAGkC;AAFhC,2HAAA,uBAAuB,OAAA;AACvB,qHAAA,iBAAiB,OAAA;AAcnB,8DAAwC;AACxC,kBAAe,oBAAY,CAAC"}
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;;AAOA,2CAAyE;AAAhE,0GAAA,YAAY,OAAA;AACrB,2EAAuE;AAA9D,qIAAA,uBAAuB,OAAA;AAChC,2DAAyD;AAAhD,iHAAA,cAAc,OAAA;AACvB,uCAAyD;AAAhD,mHAAA,yBAAyB,OAAA;AAMlC,6DAGkC;AAFhC,2HAAA,uBAAuB,OAAA;AACvB,qHAAA,iBAAiB,OAAA;AAQnB,oDAAsD;AAA7C,6GAAA,cAAc,OAAA;AAUvB,8DAAwC;AACxC,kBAAe,oBAAY,CAAC"}

dist/loaders/node-loader.d.ts

@@ -6,6 +6,8 @@ export interface LoadedNode {
 export declare class N8nNodeLoader {
     private readonly CORE_PACKAGES;
     loadAllNodes(): Promise<LoadedNode[]>;
+    private resolvePackageDir;
+    private loadNodeModule;
     private loadPackageNodes;
 }
 //# sourceMappingURL=node-loader.d.ts.map

dist/loaders/node-loader.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"node-loader.d.ts","sourceRoot":"","sources":["../../src/loaders/node-loader.ts"],"names":[],"mappings":"AAEA,MAAM,WAAW,UAAU;IACzB,WAAW,EAAE,MAAM,CAAC;IACpB,QAAQ,EAAE,MAAM,CAAC;IACjB,SAAS,EAAE,GAAG,CAAC;CAChB;AAED,qBAAa,aAAa;IACxB,OAAO,CAAC,QAAQ,CAAC,aAAa,CAG5B;IAEI,YAAY,IAAI,OAAO,CAAC,UAAU,EAAE,CAAC;YAmB7B,gBAAgB;CAqD/B"}
+{"version":3,"file":"node-loader.d.ts","sourceRoot":"","sources":["../../src/loaders/node-loader.ts"],"names":[],"mappings":"AAEA,MAAM,WAAW,UAAU;IACzB,WAAW,EAAE,MAAM,CAAC;IACpB,QAAQ,EAAE,MAAM,CAAC;IACjB,SAAS,EAAE,GAAG,CAAC;CAChB;AAED,qBAAa,aAAa;IACxB,OAAO,CAAC,QAAQ,CAAC,aAAa,CAG5B;IAEI,YAAY,IAAI,OAAO,CAAC,UAAU,EAAE,CAAC;IAuB3C,OAAO,CAAC,iBAAiB;IAUzB,OAAO,CAAC,cAAc;YAIR,gBAAgB;CAuD/B"}

dist/loaders/node-loader.js

@@ -28,15 +28,23 @@ class N8nNodeLoader {
         }
         return results;
     }
+    resolvePackageDir(packagePath) {
+        const pkgJsonPath = require.resolve(`${packagePath}/package.json`);
+        return path_1.default.dirname(pkgJsonPath);
+    }
+    loadNodeModule(absolutePath) {
+        return require(absolutePath);
+    }
     async loadPackageNodes(packageName, packagePath, packageJson) {
         const n8nConfig = packageJson.n8n || {};
         const nodes = [];
+        const packageDir = this.resolvePackageDir(packagePath);
         const nodesList = n8nConfig.nodes || [];
         if (Array.isArray(nodesList)) {
             for (const nodePath of nodesList) {
                 try {
-                    const fullPath = require.resolve(`${packagePath}/${nodePath}`);
-                    const nodeModule = require(fullPath);
+                    const fullPath = path_1.default.join(packageDir, nodePath);
+                    const nodeModule = this.loadNodeModule(fullPath);
                     const nodeNameMatch = nodePath.match(/\/([^\/]+)\.node\.(js|ts)$/);
                     const nodeName = nodeNameMatch ? nodeNameMatch[1] : path_1.default.basename(nodePath, '.node.js');
                     const NodeClass = nodeModule.default || nodeModule[nodeName] || Object.values(nodeModule)[0];
@@ -56,8 +64,8 @@ class N8nNodeLoader {
         else {
             for (const [nodeName, nodePath] of Object.entries(nodesList)) {
                 try {
-                    const fullPath = require.resolve(`${packagePath}/${nodePath}`);
-                    const nodeModule = require(fullPath);
+                    const fullPath = path_1.default.join(packageDir, nodePath);
+                    const nodeModule = this.loadNodeModule(fullPath);
                     const NodeClass = nodeModule.default || nodeModule[nodeName] || Object.values(nodeModule)[0];
                     if (NodeClass) {
                         nodes.push({ packageName, nodeName, NodeClass });

dist/loaders/node-loader.js.map

@@ -1 +1 @@
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dist/mcp/handlers-n8n-manager.d.ts.map

@@ -1 +1 @@
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dist/mcp/handlers-n8n-manager.js

@@ -212,7 +212,13 @@ const autofixWorkflowSchema = zod_1.z.object({
         'node-type-correction',
         'webhook-missing-path',
         'typeversion-upgrade',
-        'version-migration'
+        'version-migration',
+        'tool-variant-correction',
+        'connection-numeric-keys',
+        'connection-invalid-type',
+        'connection-id-to-name',
+        'connection-duplicate-removal',
+        'connection-input-index'
     ])).optional(),
     confidenceThreshold: zod_1.z.enum(['high', 'medium', 'low']).optional().default('medium'),
     maxFixes: zod_1.z.number().optional().default(50)

dist/mcp/index.js

@@ -124,6 +124,15 @@ Learn more: https://github.com/czlonkowski/n8n-mcp/blob/main/PRIVACY.md
             checkpoints.push(startup_checkpoints_1.STARTUP_CHECKPOINTS.MCP_HANDSHAKE_STARTING);
             if (mode === 'http') {
                 if (process.env.USE_FIXED_HTTP === 'true') {
+                    logger_1.logger.warn('DEPRECATION WARNING: USE_FIXED_HTTP=true is deprecated as of v2.31.8. ' +
+                        'The fixed HTTP implementation does not support SSE streaming required by clients like OpenAI Codex. ' +
+                        'Please unset USE_FIXED_HTTP to use the modern SingleSessionHTTPServer which supports both JSON-RPC and SSE. ' +
+                        'This option will be removed in a future version. See: https://github.com/czlonkowski/n8n-mcp/issues/524');
+                    console.warn('\n⚠️  DEPRECATION WARNING ⚠️');
+                    console.warn('USE_FIXED_HTTP=true is deprecated as of v2.31.8.');
+                    console.warn('The fixed HTTP implementation does not support SSE streaming.');
+                    console.warn('Please unset USE_FIXED_HTTP to use SingleSessionHTTPServer.');
+                    console.warn('See: https://github.com/czlonkowski/n8n-mcp/issues/524\n');
                     const { startFixedHTTPServer } = await Promise.resolve().then(() => __importStar(require('../http-server')));
                     await startFixedHTTPServer();
                 }

dist/mcp/server.d.ts

@@ -13,6 +13,9 @@ export declare class N8NDocumentationMCPServer {
     private previousToolTimestamp;
     private earlyLogger;
     private disabledToolsCache;
+    private useSharedDatabase;
+    private sharedDbState;
+    private isShutdown;
     constructor(instanceContext?: InstanceContext, earlyLogger?: EarlyErrorLogger);
     close(): Promise<void>;
     private initializeDatabase;
@@ -27,6 +30,7 @@ export declare class N8NDocumentationMCPServer {
     private validateToolParams;
     private validateToolParamsBasic;
     private validateExtractedArgs;
+    private coerceStringifiedJsonParams;
     private listNodes;
     private getNodeInfo;
     private searchNodes;
@@ -40,6 +44,7 @@ export declare class N8NDocumentationMCPServer {
     private rankSearchResults;
     private listAITools;
     private getNodeDocumentation;
+    private safeJsonParse;
     private getDatabaseStatistics;
     private getNodeEssentials;
     private getNode;

dist/mcp/server.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"server.d.ts","sourceRoot":"","sources":["../../src/mcp/server.ts"],"names":[],"mappings":"AA0CA,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,gBAAgB,EAAE,MAAM,iCAAiC,CAAC;AAmGnE,qBAAa,yBAAyB;IACpC,OAAO,CAAC,MAAM,CAAS;IACvB,OAAO,CAAC,EAAE,CAAgC;IAC1C,OAAO,CAAC,UAAU,CAA+B;IACjD,OAAO,CAAC,eAAe,CAAgC;IACvD,OAAO,CAAC,WAAW,CAAgB;IACnC,OAAO,CAAC,KAAK,CAAqB;IAClC,OAAO,CAAC,UAAU,CAAa;IAC/B,OAAO,CAAC,eAAe,CAAC,CAAkB;IAC1C,OAAO,CAAC,YAAY,CAAuB;IAC3C,OAAO,CAAC,qBAAqB,CAAsB;IACnD,OAAO,CAAC,WAAW,CAAiC;IACpD,OAAO,CAAC,kBAAkB,CAA4B;IACtD,OAAO,CAAC,iBAAiB,CAAkB;IAC3C,OAAO,CAAC,aAAa,CAAoC;IACzD,OAAO,CAAC,UAAU,CAAkB;gBAExB,eAAe,CAAC,EAAE,eAAe,EAAE,WAAW,CAAC,EAAE,gBAAgB;IAuGvE,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;YA+Cd,kBAAkB;YAiDlB,wBAAwB;IA0BtC,OAAO,CAAC,kBAAkB;YA6CZ,iBAAiB;IAa/B,OAAO,CAAC,eAAe,CAAkB;YAE3B,sBAAsB;IAgDpC,OAAO,CAAC,gBAAgB;IAqCxB,OAAO,CAAC,aAAa;IA0XrB,OAAO,CAAC,wBAAwB;IAoFhC,OAAO,CAAC,kBAAkB;IAqE1B,OAAO,CAAC,uBAAuB;IAwB/B,OAAO,CAAC,qBAAqB;IAiF7B,OAAO,CAAC,2BAA2B;YA0UrB,SAAS;YA2DT,WAAW;YAkFX,WAAW;YA0CX,cAAc;YA8Md,gBAAgB;IAqD9B,OAAO,CAAC,mBAAmB;IAwE3B,OAAO,CAAC,eAAe;YAsBT,eAAe;IA2L7B,OAAO,CAAC,kBAAkB;IAQ1B,OAAO,CAAC,uBAAuB;IA0D/B,OAAO,CAAC,iBAAiB;YAqFX,WAAW;YAgCX,oBAAoB;IAuFlC,OAAO,CAAC,aAAa;YAQP,qBAAqB;YAwDrB,iBAAiB;YAiKjB,OAAO;YAgDP,cAAc;YAwFd,iBAAiB;IAqC/B,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,eAAe;IAwCvB,OAAO,CAAC,kBAAkB;IAiC1B,OAAO,CAAC,aAAa;IAoCrB,OAAO,CAAC,0BAA0B;IAgClC,OAAO,CAAC,4BAA4B;YAKtB,oBAAoB;IAsDlC,OAAO,CAAC,gBAAgB;YAiBV,SAAS;YA6CT,kBAAkB;YAqElB,uBAAuB;YAsDvB,iBAAiB;IAqE/B,OAAO,CAAC,qBAAqB;IA8C7B,OAAO,CAAC,uBAAuB;IA4D/B,OAAO,CAAC,wBAAwB;IAkChC,OAAO,CAAC,iBAAiB;YAoDX,mBAAmB;YAoEnB,qBAAqB;IAS7B,OAAO,CAAC,SAAS,EAAE,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC;YAS9B,aAAa;YAcb,iBAAiB;YAoBjB,WAAW;YAwBX,eAAe;YAqBf,mBAAmB;YAwBnB,yBAAyB;IA4CvC,OAAO,CAAC,kBAAkB;YAiBZ,gBAAgB;YA6HhB,2BAA2B;YAiE3B,2BAA2B;IAyEnC,GAAG,IAAI,OAAO,CAAC,IAAI,CAAC;IA0BpB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CAgEhC"}

dist/mcp/server.js

@@ -43,12 +43,14 @@ const types_js_1 = require("@modelcontextprotocol/sdk/types.js");
 const fs_1 = require("fs");
 const path_1 = __importDefault(require("path"));
 const tools_1 = require("./tools");
+const ui_1 = require("./ui");
 const tools_n8n_manager_1 = require("./tools-n8n-manager");
 const tools_n8n_friendly_1 = require("./tools-n8n-friendly");
 const workflow_examples_1 = require("./workflow-examples");
 const logger_1 = require("../utils/logger");
 const node_repository_1 = require("../database/node-repository");
 const database_adapter_1 = require("../database/database-adapter");
+const shared_database_1 = require("../database/shared-database");
 const property_filter_1 = require("../services/property-filter");
 const task_templates_1 = require("../services/task-templates");
 const config_validator_1 = require("../services/config-validator");
@@ -80,6 +82,9 @@ class N8NDocumentationMCPServer {
         this.previousToolTimestamp = Date.now();
         this.earlyLogger = null;
         this.disabledToolsCache = null;
+        this.useSharedDatabase = false;
+        this.sharedDbState = null;
+        this.isShutdown = false;
         this.dbHealthChecked = false;
         this.instanceContext = instanceContext;
         this.earlyLogger = earlyLogger || null;
@@ -144,15 +149,29 @@ class N8NDocumentationMCPServer {
         }, {
             capabilities: {
                 tools: {},
+                resources: {},
             },
         });
+        ui_1.UIAppRegistry.load();
         this.setupHandlers();
     }
     async close() {
+        try {
+            await this.initialized;
+        }
+        catch (error) {
+            logger_1.logger.debug('Initialization had failed, proceeding with cleanup', {
+                error: error instanceof Error ? error.message : String(error)
+            });
+        }
         try {
             await this.server.close();
             this.cache.destroy();
-            if (this.db) {
+            if (this.useSharedDatabase && this.sharedDbState) {
+                (0, shared_database_1.releaseSharedDatabase)(this.sharedDbState);
+                logger_1.logger.debug('Released shared database reference');
+            }
+            else if (this.db) {
                 try {
                     this.db.close();
                 }
@@ -166,6 +185,7 @@ class N8NDocumentationMCPServer {
             this.repository = null;
             this.templateService = null;
             this.earlyLogger = null;
+            this.sharedDbState = null;
         }
         catch (error) {
             logger_1.logger.warn('Error closing MCP server', { error: error instanceof Error ? error.message : String(error) });
@@ -177,17 +197,27 @@ class N8NDocumentationMCPServer {
                 this.earlyLogger.logCheckpoint(startup_checkpoints_1.STARTUP_CHECKPOINTS.DATABASE_CONNECTING);
             }
             logger_1.logger.debug('Database initialization starting...', { dbPath });
-            this.db = await (0, database_adapter_1.createDatabaseAdapter)(dbPath);
-            logger_1.logger.debug('Database adapter created');
             if (dbPath === ':memory:') {
+                this.db = await (0, database_adapter_1.createDatabaseAdapter)(dbPath);
+                logger_1.logger.debug('Database adapter created (in-memory mode)');
                 await this.initializeInMemorySchema();
                 logger_1.logger.debug('In-memory schema initialized');
+                this.repository = new node_repository_1.NodeRepository(this.db);
+                this.templateService = new template_service_1.TemplateService(this.db);
+                enhanced_config_validator_1.EnhancedConfigValidator.initializeSimilarityServices(this.repository);
+                this.useSharedDatabase = false;
+            }
+            else {
+                const sharedState = await (0, shared_database_1.getSharedDatabase)(dbPath);
+                this.db = sharedState.db;
+                this.repository = sharedState.repository;
+                this.templateService = sharedState.templateService;
+                this.sharedDbState = sharedState;
+                this.useSharedDatabase = true;
+                logger_1.logger.debug('Using shared database connection');
             }
-            this.repository = new node_repository_1.NodeRepository(this.db);
             logger_1.logger.debug('Node repository initialized');
-            this.templateService = new template_service_1.TemplateService(this.db);
             logger_1.logger.debug('Template service initialized');
-            enhanced_config_validator_1.EnhancedConfigValidator.initializeSimilarityServices(this.repository);
             logger_1.logger.debug('Similarity services initialized');
             if (this.earlyLogger) {
                 this.earlyLogger.logCheckpoint(startup_checkpoints_1.STARTUP_CHECKPOINTS.DATABASE_CONNECTED);
@@ -341,6 +371,7 @@ class N8NDocumentationMCPServer {
                 protocolVersion: negotiationResult.version,
                 capabilities: {
                     tools: {},
+                    resources: {},
                 },
                 serverInfo: {
                     name: 'n8n-documentation-mcp',
@@ -396,6 +427,7 @@ class N8NDocumentationMCPServer {
                     description: tool.description
                 });
             });
+            ui_1.UIAppRegistry.injectToolMeta(tools);
             return { tools };
         });
         this.server.setRequestHandler(types_js_1.CallToolRequestSchema, async (request) => {
@@ -425,6 +457,18 @@ class N8NDocumentationMCPServer {
                 };
             }
             let processedArgs = args;
+            if (typeof args === 'string') {
+                try {
+                    const parsed = JSON.parse(args);
+                    if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) {
+                        processedArgs = parsed;
+                        logger_1.logger.warn(`Coerced stringified args object for tool "${name}"`);
+                    }
+                }
+                catch {
+                    logger_1.logger.warn(`Tool "${name}" received string args that are not valid JSON`);
+                }
+            }
             if (args && typeof args === 'object' && 'output' in args) {
                 try {
                     const possibleNestedData = args.output;
@@ -453,6 +497,7 @@ class N8NDocumentationMCPServer {
                     });
                 }
             }
+            processedArgs = this.coerceStringifiedJsonParams(name, processedArgs);
             try {
                 logger_1.logger.debug(`Executing tool: ${name}`, { args: processedArgs });
                 const startTime = Date.now();
@@ -524,6 +569,13 @@ class N8NDocumentationMCPServer {
                 if (name.startsWith('validate_') && (errorMessage.includes('config') || errorMessage.includes('nodeType'))) {
                     helpfulMessage += '\n\nFor validation tools:\n- nodeType should be a string (e.g., "nodes-base.webhook")\n- config should be an object (e.g., {})';
                 }
+                try {
+                    const argDiag = processedArgs && typeof processedArgs === 'object'
+                        ? Object.entries(processedArgs).map(([k, v]) => `${k}: ${typeof v}`).join(', ')
+                        : `args type: ${typeof processedArgs}`;
+                    helpfulMessage += `\n\n[Diagnostic] Received arg types: {${argDiag}}`;
+                }
+                catch { }
                 return {
                     content: [
                         {
@@ -535,6 +587,39 @@ class N8NDocumentationMCPServer {
                 };
             }
         });
+        this.server.setRequestHandler(types_js_1.ListResourcesRequestSchema, async () => {
+            const apps = ui_1.UIAppRegistry.getAllApps();
+            return {
+                resources: apps
+                    .filter(app => app.html !== null)
+                    .map(app => ({
+                    uri: app.config.uri,
+                    name: app.config.displayName,
+                    description: app.config.description,
+                    mimeType: app.config.mimeType,
+                })),
+            };
+        });
+        this.server.setRequestHandler(types_js_1.ReadResourceRequestSchema, async (request) => {
+            const uri = request.params.uri;
+            const match = uri.match(/^ui:\/\/n8n-mcp\/(.+)$/);
+            if (!match) {
+                throw new Error(`Unknown resource URI: ${uri}`);
+            }
+            const app = ui_1.UIAppRegistry.getAppById(match[1]);
+            if (!app || !app.html) {
+                throw new Error(`UI app not found or not built: ${match[1]}`);
+            }
+            return {
+                contents: [
+                    {
+                        uri: app.config.uri,
+                        mimeType: app.config.mimeType,
+                        text: app.html,
+                    },
+                ],
+            };
+        });
     }
     sanitizeValidationResult(result, toolName) {
         if (!result || typeof result !== 'object') {
@@ -730,6 +815,93 @@ class N8NDocumentationMCPServer {
         }
         return true;
     }
+    coerceStringifiedJsonParams(toolName, args) {
+        if (!args || typeof args !== 'object')
+            return args;
+        const allTools = [...tools_1.n8nDocumentationToolsFinal, ...tools_n8n_manager_1.n8nManagementTools];
+        const tool = allTools.find(t => t.name === toolName);
+        if (!tool?.inputSchema?.properties)
+            return args;
+        const properties = tool.inputSchema.properties;
+        const coerced = { ...args };
+        let coercedAny = false;
+        for (const [key, value] of Object.entries(coerced)) {
+            if (value === undefined || value === null)
+                continue;
+            const propSchema = properties[key];
+            if (!propSchema)
+                continue;
+            const expectedType = propSchema.type;
+            if (!expectedType)
+                continue;
+            const actualType = typeof value;
+            if (expectedType === 'string' && actualType === 'string')
+                continue;
+            if ((expectedType === 'number' || expectedType === 'integer') && actualType === 'number')
+                continue;
+            if (expectedType === 'boolean' && actualType === 'boolean')
+                continue;
+            if (expectedType === 'object' && actualType === 'object' && !Array.isArray(value))
+                continue;
+            if (expectedType === 'array' && Array.isArray(value))
+                continue;
+            if (actualType === 'string') {
+                const trimmed = value.trim();
+                if (expectedType === 'object' && trimmed.startsWith('{')) {
+                    try {
+                        const parsed = JSON.parse(trimmed);
+                        if (typeof parsed === 'object' && parsed !== null && !Array.isArray(parsed)) {
+                            coerced[key] = parsed;
+                            coercedAny = true;
+                        }
+                    }
+                    catch { }
+                    continue;
+                }
+                if (expectedType === 'array' && trimmed.startsWith('[')) {
+                    try {
+                        const parsed = JSON.parse(trimmed);
+                        if (Array.isArray(parsed)) {
+                            coerced[key] = parsed;
+                            coercedAny = true;
+                        }
+                    }
+                    catch { }
+                    continue;
+                }
+                if (expectedType === 'number' || expectedType === 'integer') {
+                    const num = Number(trimmed);
+                    if (!isNaN(num) && trimmed !== '') {
+                        coerced[key] = expectedType === 'integer' ? Math.trunc(num) : num;
+                        coercedAny = true;
+                    }
+                    continue;
+                }
+                if (expectedType === 'boolean') {
+                    if (trimmed === 'true') {
+                        coerced[key] = true;
+                        coercedAny = true;
+                    }
+                    else if (trimmed === 'false') {
+                        coerced[key] = false;
+                        coercedAny = true;
+                    }
+                    continue;
+                }
+            }
+            if (expectedType === 'string' && (actualType === 'number' || actualType === 'boolean')) {
+                coerced[key] = String(value);
+                coercedAny = true;
+                continue;
+            }
+        }
+        if (coercedAny) {
+            logger_1.logger.warn(`Coerced mistyped params for tool "${toolName}"`, {
+                original: Object.fromEntries(Object.entries(args).map(([k, v]) => [k, `${typeof v}: ${typeof v === 'string' ? v.substring(0, 80) : v}`])),
+            });
+        }
+        return coerced;
+    }
     async executeTool(name, args) {
         args = args || {};
         const disabledTools = this.getDisabledTools();
@@ -750,7 +922,11 @@ class N8NDocumentationMCPServer {
             case 'search_nodes':
                 this.validateToolParams(name, args, ['query']);
                 const limit = args.limit !== undefined ? Number(args.limit) || 20 : 20;
-                return this.searchNodes(args.query, limit, { mode: args.mode, includeExamples: args.includeExamples });
+                return this.searchNodes(args.query, limit, {
+                    mode: args.mode,
+                    includeExamples: args.includeExamples,
+                    source: args.source
+                });
             case 'get_node':
                 this.validateToolParams(name, args, ['nodeType']);
                 if (args.mode === 'docs') {
@@ -1089,6 +1265,19 @@ class N8NDocumentationMCPServer {
             }
         }
         try {
+            let sourceFilter = '';
+            const sourceValue = options?.source || 'all';
+            switch (sourceValue) {
+                case 'core':
+                    sourceFilter = 'AND n.is_community = 0';
+                    break;
+                case 'community':
+                    sourceFilter = 'AND n.is_community = 1';
+                    break;
+                case 'verified':
+                    sourceFilter = 'AND n.is_community = 1 AND n.is_verified = 1';
+                    break;
+            }
             const nodes = this.db.prepare(`
         SELECT
           n.*,
@@ -1096,6 +1285,7 @@ class N8NDocumentationMCPServer {
         FROM nodes n
         JOIN nodes_fts ON n.rowid = nodes_fts.rowid
         WHERE nodes_fts MATCH ?
+        ${sourceFilter}
         ORDER BY
           CASE
             WHEN LOWER(n.display_name) = LOWER(?) THEN 0
@@ -1128,15 +1318,28 @@ class N8NDocumentationMCPServer {
             }
             const result = {
                 query,
-                results: scoredNodes.map(node => ({
-                    nodeType: node.node_type,
-                    workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
-                    displayName: node.display_name,
-                    description: node.description,
-                    category: node.category,
-                    package: node.package_name,
-                    relevance: this.calculateRelevance(node, cleanedQuery)
-                })),
+                results: scoredNodes.map(node => {
+                    const nodeResult = {
+                        nodeType: node.node_type,
+                        workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
+                        displayName: node.display_name,
+                        description: node.description,
+                        category: node.category,
+                        package: node.package_name,
+                        relevance: this.calculateRelevance(node, cleanedQuery)
+                    };
+                    if (node.is_community === 1) {
+                        nodeResult.isCommunity = true;
+                        nodeResult.isVerified = node.is_verified === 1;
+                        if (node.author_name) {
+                            nodeResult.authorName = node.author_name;
+                        }
+                        if (node.npm_downloads) {
+                            nodeResult.npmDownloads = node.npm_downloads;
+                        }
+                    }
+                    return nodeResult;
+                }),
                 totalCount: scoredNodes.length
             };
             if (mode !== 'OR') {
@@ -1298,24 +1501,51 @@ class N8NDocumentationMCPServer {
     async searchNodesLIKE(query, limit, options) {
         if (!this.db)
             throw new Error('Database not initialized');
+        let sourceFilter = '';
+        const sourceValue = options?.source || 'all';
+        switch (sourceValue) {
+            case 'core':
+                sourceFilter = 'AND is_community = 0';
+                break;
+            case 'community':
+                sourceFilter = 'AND is_community = 1';
+                break;
+            case 'verified':
+                sourceFilter = 'AND is_community = 1 AND is_verified = 1';
+                break;
+        }
         if (query.startsWith('"') && query.endsWith('"')) {
             const exactPhrase = query.slice(1, -1);
             const nodes = this.db.prepare(`
         SELECT * FROM nodes
-        WHERE node_type LIKE ? OR display_name LIKE ? OR description LIKE ?
+        WHERE (node_type LIKE ? OR display_name LIKE ? OR description LIKE ?)
+        ${sourceFilter}
         LIMIT ?
       `).all(`%${exactPhrase}%`, `%${exactPhrase}%`, `%${exactPhrase}%`, limit * 3);
             const rankedNodes = this.rankSearchResults(nodes, exactPhrase, limit);
             const result = {
                 query,
-                results: rankedNodes.map(node => ({
-                    nodeType: node.node_type,
-                    workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
-                    displayName: node.display_name,
-                    description: node.description,
-                    category: node.category,
-                    package: node.package_name
-                })),
+                results: rankedNodes.map(node => {
+                    const nodeResult = {
+                        nodeType: node.node_type,
+                        workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
+                        displayName: node.display_name,
+                        description: node.description,
+                        category: node.category,
+                        package: node.package_name
+                    };
+                    if (node.is_community === 1) {
+                        nodeResult.isCommunity = true;
+                        nodeResult.isVerified = node.is_verified === 1;
+                        if (node.author_name) {
+                            nodeResult.authorName = node.author_name;
+                        }
+                        if (node.npm_downloads) {
+                            nodeResult.npmDownloads = node.npm_downloads;
+                        }
+                    }
+                    return nodeResult;
+                }),
                 totalCount: rankedNodes.length
             };
             if (options?.includeExamples) {
@@ -1354,21 +1584,35 @@ class N8NDocumentationMCPServer {
         const params = words.flatMap(w => [`%${w}%`, `%${w}%`, `%${w}%`]);
         params.push(limit * 3);
         const nodes = this.db.prepare(`
-      SELECT DISTINCT * FROM nodes 
-      WHERE ${conditions}
+      SELECT DISTINCT * FROM nodes
+      WHERE (${conditions})
+      ${sourceFilter}
       LIMIT ?
     `).all(...params);
         const rankedNodes = this.rankSearchResults(nodes, query, limit);
         const result = {
             query,
-            results: rankedNodes.map(node => ({
-                nodeType: node.node_type,
-                workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
-                displayName: node.display_name,
-                description: node.description,
-                category: node.category,
-                package: node.package_name
-            })),
+            results: rankedNodes.map(node => {
+                const nodeResult = {
+                    nodeType: node.node_type,
+                    workflowNodeType: (0, node_utils_1.getWorkflowNodeType)(node.package_name, node.node_type),
+                    displayName: node.display_name,
+                    description: node.description,
+                    category: node.category,
+                    package: node.package_name
+                };
+                if (node.is_community === 1) {
+                    nodeResult.isCommunity = true;
+                    nodeResult.isVerified = node.is_verified === 1;
+                    if (node.author_name) {
+                        nodeResult.authorName = node.author_name;
+                    }
+                    if (node.npm_downloads) {
+                        nodeResult.npmDownloads = node.npm_downloads;
+                    }
+                }
+                return nodeResult;
+            }),
             totalCount: rankedNodes.length
         };
         if (options?.includeExamples) {
@@ -1545,14 +1789,16 @@ class N8NDocumentationMCPServer {
             throw new Error('Database not initialized');
         const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(nodeType);
         let node = this.db.prepare(`
-      SELECT node_type, display_name, documentation, description 
-      FROM nodes 
+      SELECT node_type, display_name, documentation, description,
+             ai_documentation_summary, ai_summary_generated_at
+      FROM nodes
       WHERE node_type = ?
     `).get(normalizedType);
         if (!node && normalizedType !== nodeType) {
             node = this.db.prepare(`
-        SELECT node_type, display_name, documentation, description 
-        FROM nodes 
+        SELECT node_type, display_name, documentation, description,
+               ai_documentation_summary, ai_summary_generated_at
+        FROM nodes
         WHERE node_type = ?
       `).get(nodeType);
         }
@@ -1560,8 +1806,9 @@ class N8NDocumentationMCPServer {
             const alternatives = (0, node_utils_1.getNodeTypeAlternatives)(normalizedType);
             for (const alt of alternatives) {
                 node = this.db.prepare(`
-          SELECT node_type, display_name, documentation, description 
-          FROM nodes 
+          SELECT node_type, display_name, documentation, description,
+                 ai_documentation_summary, ai_summary_generated_at
+          FROM nodes
           WHERE node_type = ?
         `).get(alt);
                 if (node)
@@ -1571,6 +1818,9 @@ class N8NDocumentationMCPServer {
         if (!node) {
             throw new Error(`Node ${nodeType} not found`);
         }
+        const aiDocSummary = node.ai_documentation_summary
+            ? this.safeJsonParse(node.ai_documentation_summary, null)
+            : null;
         if (!node.documentation) {
             const essentials = await this.getNodeEssentials(nodeType);
             return {
@@ -1590,7 +1840,9 @@ ${essentials?.commonProperties?.length > 0 ?
 ## Note
 Full documentation is being prepared. For now, use get_node_essentials for configuration help.
 `,
-                hasDocumentation: false
+                hasDocumentation: false,
+                aiDocumentationSummary: aiDocSummary,
+                aiSummaryGeneratedAt: node.ai_summary_generated_at || null,
             };
         }
         return {
@@ -1598,8 +1850,18 @@ Full documentation is being prepared. For now, use get_node_essentials for confi
             displayName: node.display_name || 'Unknown Node',
             documentation: node.documentation,
             hasDocumentation: true,
+            aiDocumentationSummary: aiDocSummary,
+            aiSummaryGeneratedAt: node.ai_summary_generated_at || null,
         };
     }
+    safeJsonParse(json, defaultValue = null) {
+        try {
+            return JSON.parse(json);
+        }
+        catch {
+            return defaultValue;
+        }
+    }
     async getDatabaseStatistics() {
         await this.ensureInitialized();
         if (!this.db)
@@ -2799,7 +3061,26 @@ Full documentation is being prepared. For now, use get_node_essentials for confi
         process.stdin.resume();
     }
     async shutdown() {
+        if (this.isShutdown) {
+            logger_1.logger.debug('Shutdown already called, skipping');
+            return;
+        }
+        this.isShutdown = true;
         logger_1.logger.info('Shutting down MCP server...');
+        try {
+            await this.initialized;
+        }
+        catch (error) {
+            logger_1.logger.debug('Initialization had failed, proceeding with cleanup', {
+                error: error instanceof Error ? error.message : String(error)
+            });
+        }
+        try {
+            await this.server.close();
+        }
+        catch (error) {
+            logger_1.logger.error('Error closing MCP server:', error);
+        }
         if (this.cache) {
             try {
                 this.cache.destroy();
@@ -2809,15 +3090,29 @@ Full documentation is being prepared. For now, use get_node_essentials for confi
                 logger_1.logger.error('Error cleaning up cache:', error);
             }
         }
-        if (this.db) {
+        if (this.useSharedDatabase && this.sharedDbState) {
             try {
-                await this.db.close();
+                (0, shared_database_1.releaseSharedDatabase)(this.sharedDbState);
+                logger_1.logger.info('Released shared database reference');
+            }
+            catch (error) {
+                logger_1.logger.error('Error releasing shared database:', error);
+            }
+        }
+        else if (this.db) {
+            try {
+                this.db.close();
                 logger_1.logger.info('Database connection closed');
             }
             catch (error) {
                 logger_1.logger.error('Error closing database:', error);
             }
         }
+        this.db = null;
+        this.repository = null;
+        this.templateService = null;
+        this.earlyLogger = null;
+        this.sharedDbState = null;
     }
 }
 exports.N8NDocumentationMCPServer = N8NDocumentationMCPServer;

dist/mcp/tool-docs/discovery/search-nodes.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"search-nodes.d.ts","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/discovery/search-nodes.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,UAAU,CAAC;AAE7C,eAAO,MAAM,cAAc,EAAE,iBAmD5B,CAAC"}
+{"version":3,"file":"search-nodes.d.ts","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/discovery/search-nodes.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,UAAU,CAAC;AAE7C,eAAO,MAAM,cAAc,EAAE,iBAiE5B,CAAC"}

dist/mcp/tool-docs/discovery/search-nodes.js

@@ -5,50 +5,64 @@ exports.searchNodesDoc = {
     name: 'search_nodes',
     category: 'discovery',
     essentials: {
-        description: 'Text search across node names and descriptions. Returns most relevant nodes first, with frequently-used nodes (HTTP Request, Webhook, Set, Code, Slack) prioritized in results. Searches all 500+ nodes in the database.',
-        keyParameters: ['query', 'mode', 'limit'],
+        description: 'Text search across node names and descriptions. Returns most relevant nodes first, with frequently-used nodes (HTTP Request, Webhook, Set, Code, Slack) prioritized in results. Searches all 800+ nodes including 300+ verified community nodes.',
+        keyParameters: ['query', 'mode', 'limit', 'source', 'includeExamples'],
         example: 'search_nodes({query: "webhook"})',
         performance: '<20ms even for complex queries',
         tips: [
             'OR mode (default): Matches any search word',
             'AND mode: Requires all words present',
             'FUZZY mode: Handles typos and spelling errors',
-            'Use quotes for exact phrases: "google sheets"'
+            'Use quotes for exact phrases: "google sheets"',
+            'Use source="community" to search only community nodes',
+            'Use source="verified" for verified community nodes only'
         ]
     },
     full: {
-        description: 'Full-text search engine for n8n nodes using SQLite FTS5. Searches across node names, descriptions, and aliases. Results are ranked by relevance with commonly-used nodes given priority. Common nodes include: HTTP Request, Webhook, Set, Code, IF, Switch, Merge, SplitInBatches, Slack, Google Sheets.',
+        description: 'Full-text search engine for n8n nodes using SQLite FTS5. Searches across node names, descriptions, and aliases. Results are ranked by relevance with commonly-used nodes given priority. Includes 500+ core nodes and 300+ community nodes. Common core nodes include: HTTP Request, Webhook, Set, Code, IF, Switch, Merge, SplitInBatches, Slack, Google Sheets. Community nodes include verified integrations like BrightData, ScrapingBee, CraftMyPDF, and more.',
         parameters: {
             query: { type: 'string', description: 'Search keywords. Use quotes for exact phrases like "google sheets"', required: true },
             limit: { type: 'number', description: 'Maximum results to return. Default: 20, Max: 100', required: false },
-            mode: { type: 'string', description: 'Search mode: "OR" (any word matches, default), "AND" (all words required), "FUZZY" (typo-tolerant)', required: false }
+            mode: { type: 'string', description: 'Search mode: "OR" (any word matches, default), "AND" (all words required), "FUZZY" (typo-tolerant)', required: false },
+            source: { type: 'string', description: 'Filter by node source: "all" (default, everything), "core" (n8n base nodes only), "community" (community nodes only), "verified" (verified community nodes only)', required: false },
+            includeExamples: { type: 'boolean', description: 'Include top 2 real-world configuration examples from popular templates for each node. Default: false. Adds ~200-400 tokens per node.', required: false }
         },
-        returns: 'Array of node objects sorted by relevance score. Each object contains: nodeType, displayName, description, category, relevance score. Common nodes appear first when relevance is similar.',
+        returns: 'Array of node objects sorted by relevance score. Each object contains: nodeType, displayName, description, category, relevance score. For community nodes, also includes: isCommunity (boolean), isVerified (boolean), authorName (string), npmDownloads (number). Common nodes appear first when relevance is similar.',
         examples: [
             'search_nodes({query: "webhook"}) - Returns Webhook node as top result',
             'search_nodes({query: "database"}) - Returns MySQL, Postgres, MongoDB, Redis, etc.',
             'search_nodes({query: "google sheets", mode: "AND"}) - Requires both words',
             'search_nodes({query: "slak", mode: "FUZZY"}) - Finds Slack despite typo',
             'search_nodes({query: "http api"}) - Finds HTTP Request, GraphQL, REST nodes',
-            'search_nodes({query: "transform data"}) - Finds Set, Code, Function, Item Lists nodes'
+            'search_nodes({query: "transform data"}) - Finds Set, Code, Function, Item Lists nodes',
+            'search_nodes({query: "scraping", source: "community"}) - Find community scraping nodes',
+            'search_nodes({query: "pdf", source: "verified"}) - Find verified community PDF nodes',
+            'search_nodes({query: "brightdata"}) - Find BrightData community node',
+            'search_nodes({query: "slack", includeExamples: true}) - Get Slack with template examples'
         ],
         useCases: [
             'Finding nodes when you know partial names',
             'Discovering nodes by functionality (e.g., "email", "database", "transform")',
             'Handling user typos in node names',
-            'Finding all nodes related to a service (e.g., "google", "aws", "microsoft")'
+            'Finding all nodes related to a service (e.g., "google", "aws", "microsoft")',
+            'Discovering community integrations for specific services',
+            'Finding verified community nodes for enhanced trust'
         ],
         performance: '<20ms for simple queries, <50ms for complex FUZZY searches. Uses FTS5 index for speed',
         bestPractices: [
             'Start with single keywords for broadest results',
             'Use FUZZY mode when users might misspell node names',
             'AND mode works best for 2-3 word searches',
-            'Combine with get_node after finding the right node'
+            'Combine with get_node after finding the right node',
+            'Use source="verified" when recommending community nodes for production',
+            'Check isVerified flag to ensure community node quality'
         ],
         pitfalls: [
             'AND mode searches all fields (name, description) not just node names',
             'FUZZY mode with very short queries (1-2 chars) may return unexpected results',
-            'Exact matches in quotes are case-sensitive'
+            'Exact matches in quotes are case-sensitive',
+            'Community nodes require npm installation (n8n npm install <package-name>)',
+            'Unverified community nodes (isVerified: false) may have limited support'
         ],
         relatedTools: ['get_node to configure found nodes', 'search_templates to find workflow examples', 'validate_node to check configurations']
     }

dist/mcp/tool-docs/discovery/search-nodes.js.map

@@ -1 +1 @@
-{"version":3,"file":"search-nodes.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/discovery/search-nodes.ts"],"names":[],"mappings":";;;AAEa,QAAA,cAAc,GAAsB;IAC/C,IAAI,EAAE,cAAc;IACpB,QAAQ,EAAE,WAAW;IACrB,UAAU,EAAE;QACV,WAAW,EAAE,0NAA0N;QACvO,aAAa,EAAE,CAAC,OAAO,EAAE,MAAM,EAAE,OAAO,CAAC;QACzC,OAAO,EAAE,kCAAkC;QAC3C,WAAW,EAAE,gCAAgC;QAC7C,IAAI,EAAE;YACJ,4CAA4C;YAC5C,sCAAsC;YACtC,+CAA+C;YAC/C,+CAA+C;SAChD;KACF;IACD,IAAI,EAAE;QACJ,WAAW,EAAE,2SAA2S;QACxT,UAAU,EAAE;YACV,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,oEAAoE,EAAE,QAAQ,EAAE,IAAI,EAAE;YAC5H,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,kDAAkD,EAAE,QAAQ,EAAE,KAAK,EAAE;YAC3G,IAAI,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,oGAAoG,EAAE,QAAQ,EAAE,KAAK,EAAE;SAC7J;QACD,OAAO,EAAE,4LAA4L;QACrM,QAAQ,EAAE;YACR,uEAAuE;YACvE,mFAAmF;YACnF,2EAA2E;YAC3E,yEAAyE;YACzE,6EAA6E;YAC7E,uFAAuF;SACxF;QACD,QAAQ,EAAE;YACR,2CAA2C;YAC3C,6EAA6E;YAC7E,mCAAmC;YACnC,6EAA6E;SAC9E;QACD,WAAW,EAAE,uFAAuF;QACpG,aAAa,EAAE;YACb,iDAAiD;YACjD,qDAAqD;YACrD,2CAA2C;YAC3C,oDAAoD;SACrD;QACD,QAAQ,EAAE;YACR,sEAAsE;YACtE,8EAA8E;YAC9E,4CAA4C;SAC7C;QACD,YAAY,EAAE,CAAC,mCAAmC,EAAE,4CAA4C,EAAE,uCAAuC,CAAC;KAC3I;CACF,CAAC"}
+{"version":3,"file":"search-nodes.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/discovery/search-nodes.ts"],"names":[],"mappings":";;;AAEa,QAAA,cAAc,GAAsB;IAC/C,IAAI,EAAE,cAAc;IACpB,QAAQ,EAAE,WAAW;IACrB,UAAU,EAAE;QACV,WAAW,EAAE,kPAAkP;QAC/P,aAAa,EAAE,CAAC,OAAO,EAAE,MAAM,EAAE,OAAO,EAAE,QAAQ,EAAE,iBAAiB,CAAC;QACtE,OAAO,EAAE,kCAAkC;QAC3C,WAAW,EAAE,gCAAgC;QAC7C,IAAI,EAAE;YACJ,4CAA4C;YAC5C,sCAAsC;YACtC,+CAA+C;YAC/C,+CAA+C;YAC/C,uDAAuD;YACvD,yDAAyD;SAC1D;KACF;IACD,IAAI,EAAE;QACJ,WAAW,EAAE,qcAAqc;QACld,UAAU,EAAE;YACV,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,oEAAoE,EAAE,QAAQ,EAAE,IAAI,EAAE;YAC5H,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,kDAAkD,EAAE,QAAQ,EAAE,KAAK,EAAE;YAC3G,IAAI,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,oGAAoG,EAAE,QAAQ,EAAE,KAAK,EAAE;YAC5J,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,kKAAkK,EAAE,QAAQ,EAAE,KAAK,EAAE;YAC5N,eAAe,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,WAAW,EAAE,sIAAsI,EAAE,QAAQ,EAAE,KAAK,EAAE;SAC3M;QACD,OAAO,EAAE,yTAAyT;QAClU,QAAQ,EAAE;YACR,uEAAuE;YACvE,mFAAmF;YACnF,2EAA2E;YAC3E,yEAAyE;YACzE,6EAA6E;YAC7E,uFAAuF;YACvF,wFAAwF;YACxF,sFAAsF;YACtF,sEAAsE;YACtE,0FAA0F;SAC3F;QACD,QAAQ,EAAE;YACR,2CAA2C;YAC3C,6EAA6E;YAC7E,mCAAmC;YACnC,6EAA6E;YAC7E,0DAA0D;YAC1D,qDAAqD;SACtD;QACD,WAAW,EAAE,uFAAuF;QACpG,aAAa,EAAE;YACb,iDAAiD;YACjD,qDAAqD;YACrD,2CAA2C;YAC3C,oDAAoD;YACpD,wEAAwE;YACxE,wDAAwD;SACzD;QACD,QAAQ,EAAE;YACR,sEAAsE;YACtE,8EAA8E;YAC9E,4CAA4C;YAC5C,2EAA2E;YAC3E,yEAAyE;SAC1E;QACD,YAAY,EAAE,CAAC,mCAAmC,EAAE,4CAA4C,EAAE,uCAAuC,CAAC;KAC3I;CACF,CAAC"}

dist/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.js

@@ -195,12 +195,12 @@ Please choose a different name.
 - Can rename a node and add/remove connections using the new name in the same batch
 - Use \`validateOnly: true\` to preview effects before applying
 
-## Removing Properties with undefined
+## Removing Properties with null
 
-To remove a property from a node, set its value to \`undefined\` in the updates object. This is essential when migrating from deprecated properties or cleaning up optional configuration fields.
+To remove a property from a node, set its value to \`null\` in the updates object. This is essential when migrating from deprecated properties or cleaning up optional configuration fields.
 
-### Why Use undefined?
-- **Property removal vs. null**: Setting a property to \`undefined\` removes it completely from the node object, while \`null\` sets the property to a null value
+### Why Use null?
+- **Property removal**: Setting a property to \`null\` removes it completely from the node object
 - **Validation constraints**: Some properties are mutually exclusive (e.g., \`continueOnFail\` and \`onError\`). Simply setting one without removing the other will fail validation
 - **Deprecated property migration**: When n8n deprecates properties, you must remove the old property before the new one will work
 
@@ -212,7 +212,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "HTTP Request",
-    updates: { onError: undefined }
+    updates: { onError: null }
   }]
 });
 
@@ -222,7 +222,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeId: "node_abc",
-    updates: { disabled: undefined }
+    updates: { disabled: null }
   }]
 });
 \`\`\`
@@ -236,7 +236,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "API Request",
-    updates: { "parameters.authentication": undefined }
+    updates: { "parameters.authentication": null }
   }]
 });
 
@@ -246,7 +246,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "HTTP Request",
-    updates: { "parameters.headers": undefined }
+    updates: { "parameters.headers": null }
   }]
 });
 \`\`\`
@@ -272,7 +272,7 @@ n8n_update_partial_workflow({
     type: "updateNode",
     nodeName: "HTTP Request",
     updates: {
-      continueOnFail: undefined,
+      continueOnFail: null,
       onError: "continueErrorOutput"
     }
   }]
@@ -288,15 +288,15 @@ n8n_update_partial_workflow({
     type: "updateNode",
     nodeName: "Data Processor",
     updates: {
-      continueOnFail: undefined,
-      alwaysOutputData: undefined,
-      "parameters.legacy_option": undefined
+      continueOnFail: null,
+      alwaysOutputData: null,
+      "parameters.legacy_option": null
     }
   }]
 });
 \`\`\`
 
-### When to Use undefined
+### When to Use null
 - Removing deprecated properties during migration
 - Cleaning up optional configuration flags
 - Resolving mutual exclusivity validation errors
@@ -342,11 +342,11 @@ n8n_update_partial_workflow({
             '// Rewire AI Agent to use different language model\nn8n_update_partial_workflow({id: "ai9", operations: [{type: "rewireConnection", source: "AI Agent", from: "OpenAI Chat Model", to: "Anthropic Chat Model", sourceOutput: "ai_languageModel"}]})',
             '// Replace all AI tools for an agent\nn8n_update_partial_workflow({id: "ai10", operations: [\n  {type: "removeConnection", source: "Old Tool 1", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "removeConnection", source: "Old Tool 2", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "addConnection", source: "New HTTP Tool", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "addConnection", source: "New Code Tool", target: "AI Agent", sourceOutput: "ai_tool"}\n]})',
             '\n// ============ REMOVING PROPERTIES EXAMPLES ============',
-            '// Remove a simple property\nn8n_update_partial_workflow({id: "rm1", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {onError: undefined}}]})',
-            '// Migrate from deprecated continueOnFail to onError\nn8n_update_partial_workflow({id: "rm2", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {continueOnFail: undefined, onError: "continueErrorOutput"}}]})',
-            '// Remove nested property\nn8n_update_partial_workflow({id: "rm3", operations: [{type: "updateNode", nodeName: "API Request", updates: {"parameters.authentication": undefined}}]})',
-            '// Remove multiple properties\nn8n_update_partial_workflow({id: "rm4", operations: [{type: "updateNode", nodeName: "Data Processor", updates: {continueOnFail: undefined, alwaysOutputData: undefined, "parameters.legacy_option": undefined}}]})',
-            '// Remove entire array property\nn8n_update_partial_workflow({id: "rm5", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {"parameters.headers": undefined}}]})'
+            '// Remove a simple property\nn8n_update_partial_workflow({id: "rm1", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {onError: null}}]})',
+            '// Migrate from deprecated continueOnFail to onError\nn8n_update_partial_workflow({id: "rm2", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {continueOnFail: null, onError: "continueErrorOutput"}}]})',
+            '// Remove nested property\nn8n_update_partial_workflow({id: "rm3", operations: [{type: "updateNode", nodeName: "API Request", updates: {"parameters.authentication": null}}]})',
+            '// Remove multiple properties\nn8n_update_partial_workflow({id: "rm4", operations: [{type: "updateNode", nodeName: "Data Processor", updates: {continueOnFail: null, alwaysOutputData: null, "parameters.legacy_option": null}}]})',
+            '// Remove entire array property\nn8n_update_partial_workflow({id: "rm5", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {"parameters.headers": null}}]})'
         ],
         useCases: [
             'Rewire connections when replacing nodes',
@@ -384,9 +384,9 @@ n8n_update_partial_workflow({
             'Use targetIndex for fallback models (primary=0, fallback=1)',
             'Batch AI component connections in a single operation for atomicity',
             'Validate AI workflows after connection changes to catch configuration errors',
-            'To remove properties, set them to undefined (not null) in the updates object',
+            'To remove properties, set them to null in the updates object',
             'When migrating from deprecated properties, remove the old property and add the new one in the same operation',
-            'Use undefined to resolve mutual exclusivity validation errors between properties',
+            'Use null to resolve mutual exclusivity validation errors between properties',
             'Batch multiple property removals in a single updateNode operation for efficiency'
         ],
         pitfalls: [
@@ -408,8 +408,8 @@ n8n_update_partial_workflow({
             '**Auto-sanitization runs on ALL nodes**: When ANY update is made, ALL nodes in the workflow are sanitized (not just modified ones)',
             '**Auto-sanitization cannot fix everything**: It fixes operator structures and missing metadata, but cannot fix broken connections or branch mismatches',
             '**Corrupted workflows beyond repair**: Workflows in paradoxical states (API returns corrupt, API rejects updates) cannot be fixed via API - must be recreated',
-            'Setting a property to null does NOT remove it - use undefined instead',
-            'When properties are mutually exclusive (e.g., continueOnFail and onError), setting only the new property will fail - you must remove the old one with undefined',
+            'To remove a property, set it to null in the updates object',
+            'When properties are mutually exclusive (e.g., continueOnFail and onError), setting only the new property will fail - you must remove the old one with null',
             'Removing a required property may cause validation errors - check node documentation first',
             'Nested property removal with dot notation only removes the specific nested field, not the entire parent object',
             'Array index notation (e.g., "parameters.headers[0]") is not supported - remove the entire array property instead'

dist/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.js.map

@@ -1 +1 @@
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dist/mcp/tools-n8n-manager.js

@@ -278,7 +278,7 @@ exports.n8nManagementTools = [
     },
     {
         name: 'n8n_autofix_workflow',
-        description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths.`,
+        description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths, connection structure issues (numeric keys, invalid types, ID-to-name, duplicates, out-of-bounds indices).`,
         inputSchema: {
             type: 'object',
             properties: {
@@ -295,7 +295,7 @@ exports.n8nManagementTools = [
                     description: 'Types of fixes to apply (default: all)',
                     items: {
                         type: 'string',
-                        enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration']
+                        enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration', 'tool-variant-correction', 'connection-numeric-keys', 'connection-invalid-type', 'connection-id-to-name', 'connection-duplicate-removal', 'connection-input-index']
                     }
                 },
                 confidenceThreshold: {

dist/mcp/tools.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"tools.d.ts","sourceRoot":"","sources":["../../src/mcp/tools.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,UAAU,CAAC;AAQ1C,eAAO,MAAM,0BAA0B,EAAE,cAAc,EAkatD,CAAC"}
+{"version":3,"file":"tools.d.ts","sourceRoot":"","sources":["../../src/mcp/tools.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,UAAU,CAAC;AAQ1C,eAAO,MAAM,0BAA0B,EAAE,cAAc,EAwatD,CAAC"}

dist/mcp/tools.js

@@ -52,6 +52,12 @@ exports.n8nDocumentationToolsFinal = [
                     description: 'Include top 2 real-world configuration examples from popular templates (default: false)',
                     default: false,
                 },
+                source: {
+                    type: 'string',
+                    enum: ['all', 'core', 'community', 'verified'],
+                    description: 'Filter by node source: all=everything (default), core=n8n base nodes, community=community nodes, verified=verified community nodes only',
+                    default: 'all',
+                },
             },
             required: ['query'],
         },

dist/services/n8n-validation.d.ts

@@ -26,10 +26,10 @@ export declare const workflowNodeSchema: z.ZodObject<{
     parameters: Record<string, unknown>;
     credentials?: Record<string, unknown> | undefined;
     retryOnFail?: boolean | undefined;
+    continueOnFail?: boolean | undefined;
     maxTries?: number | undefined;
     waitBetweenTries?: number | undefined;
     alwaysOutputData?: boolean | undefined;
-    continueOnFail?: boolean | undefined;
     executeOnce?: boolean | undefined;
     disabled?: boolean | undefined;
     notes?: string | undefined;
@@ -43,10 +43,10 @@ export declare const workflowNodeSchema: z.ZodObject<{
     parameters: Record<string, unknown>;
     credentials?: Record<string, unknown> | undefined;
     retryOnFail?: boolean | undefined;
+    continueOnFail?: boolean | undefined;
     maxTries?: number | undefined;
     waitBetweenTries?: number | undefined;
     alwaysOutputData?: boolean | undefined;
-    continueOnFail?: boolean | undefined;
     executeOnce?: boolean | undefined;
     disabled?: boolean | undefined;
     notes?: string | undefined;
@@ -155,6 +155,11 @@ export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObj
         node: string;
         index: number;
     }[][] | undefined;
+    ai_tool?: {
+        type: string;
+        node: string;
+        index: number;
+    }[][] | undefined;
     ai_languageModel?: {
         type: string;
         node: string;
@@ -165,11 +170,6 @@ export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObj
         node: string;
         index: number;
     }[][] | undefined;
-    ai_tool?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
     ai_embedding?: {
         type: string;
         node: string;
@@ -191,6 +191,11 @@ export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObj
         node: string;
         index: number;
     }[][] | undefined;
+    ai_tool?: {
+        type: string;
+        node: string;
+        index: number;
+    }[][] | undefined;
     ai_languageModel?: {
         type: string;
         node: string;
@@ -201,11 +206,6 @@ export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObj
         node: string;
         index: number;
     }[][] | undefined;
-    ai_tool?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
     ai_embedding?: {
         type: string;
         node: string;

dist/services/node-specific-validators.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"node-specific-validators.d.ts","sourceRoot":"","sources":["../../src/services/node-specific-validators.ts"],"names":[],"mappings":"AAOA,OAAO,EAAE,eAAe,EAAE,iBAAiB,EAAE,MAAM,oBAAoB,CAAC;AAExE,MAAM,WAAW,qBAAqB;IACpC,MAAM,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;IAC5B,MAAM,EAAE,eAAe,EAAE,CAAC;IAC1B,QAAQ,EAAE,iBAAiB,EAAE,CAAC;IAC9B,WAAW,EAAE,MAAM,EAAE,CAAC;IACtB,OAAO,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;CAC9B;AAED,qBAAa,sBAAsB;IAIjC,MAAM,CAAC,aAAa,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAqE1D,OAAO,CAAC,MAAM,CAAC,wBAAwB;IAkDvC,OAAO,CAAC,MAAM,CAAC,0BAA0B;IAsBzC,OAAO,CAAC,MAAM,CAAC,0BAA0B;IA4BzC,OAAO,CAAC,MAAM,CAAC,0BAA0B;IA2CzC,MAAM,CAAC,oBAAoB,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAiDjE,OAAO,CAAC,MAAM,CAAC,0BAA0B;IA0BzC,OAAO,CAAC,MAAM,CAAC,wBAAwB;IAkBvC,OAAO,CAAC,MAAM,CAAC,0BAA0B;IAsBzC,OAAO,CAAC,MAAM,CAAC,0BAA0B;IA4BzC,OAAO,CAAC,MAAM,CAAC,yBAAyB;IAwCxC,MAAM,CAAC,cAAc,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAwF3D,MAAM,CAAC,eAAe,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAyG5D,MAAM,CAAC,gBAAgB,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAkI7D,MAAM,CAAC,eAAe,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAmG5D,MAAM,CAAC,aAAa,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IA6F1D,OAAO,CAAC,MAAM,CAAC,gBAAgB;IAkF/B,MAAM,CAAC,mBAAmB,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IAiGhE,MAAM,CAAC,eAAe,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IA6D5D,MAAM,CAAC,YAAY,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;IA8DzD,OAAO,CAAC,MAAM,CAAC,sBAAsB;IAuDrC,OAAO,CAAC,MAAM,CAAC,kBAAkB;IAuDjC,OAAO,CAAC,MAAM,CAAC,uBAAuB;IAyFtC,OAAO,CAAC,MAAM,CAAC,oBAAoB;IAuKnC,OAAO,CAAC,MAAM,CAAC,oBAAoB;IA2EnC,MAAM,CAAC,WAAW,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;CAoDzD"}

dist/services/node-specific-validators.js

@@ -1067,7 +1067,8 @@ class NodeSpecificValidators {
                     fix: 'Wrap in array: return [{json: yourObject}]'
                 });
             }
-            if (/return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
+            const hasHelperFunctions = /(?:function\s+\w+\s*\(|(?:const|let|var)\s+\w+\s*=\s*(?:async\s+)?(?:function|\([^)]*\)\s*=>|\w+\s*=>))/.test(code);
+            if (!hasHelperFunctions && /return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
                 errors.push({
                     type: 'invalid_value',
                     property: 'jsCode',
@@ -1149,7 +1150,7 @@ class NodeSpecificValidators {
             }
         });
         if (language === 'javaScript') {
-            if (/\$(?![a-zA-Z])/.test(code) && !code.includes('${')) {
+            if (/\$(?![a-zA-Z_(])/.test(code) && !code.includes('${')) {
                 warnings.push({
                     type: 'best_practice',
                     message: 'Invalid $ usage detected',

dist/services/workflow-auto-fixer.d.ts

@@ -5,7 +5,8 @@ import { WorkflowDiffOperation } from '../types/workflow-diff';
 import { Workflow } from '../types/n8n-api';
 import { PostUpdateGuidance } from './post-update-validator';
 export type FixConfidenceLevel = 'high' | 'medium' | 'low';
-export type FixType = 'expression-format' | 'typeversion-correction' | 'error-output-config' | 'node-type-correction' | 'webhook-missing-path' | 'typeversion-upgrade' | 'version-migration' | 'tool-variant-correction';
+export type FixType = 'expression-format' | 'typeversion-correction' | 'error-output-config' | 'node-type-correction' | 'webhook-missing-path' | 'typeversion-upgrade' | 'version-migration' | 'tool-variant-correction' | 'connection-numeric-keys' | 'connection-invalid-type' | 'connection-id-to-name' | 'connection-duplicate-removal' | 'connection-input-index';
+export declare const CONNECTION_FIX_TYPES: FixType[];
 export interface AutoFixConfig {
     applyFixes: boolean;
     fixTypes?: FixType[];
@@ -68,6 +69,12 @@ export declare class WorkflowAutoFixer {
     private filterOperationsByFixes;
     private calculateStats;
     private generateSummary;
+    private processConnectionFixes;
+    private fixNumericKeys;
+    private fixIdToName;
+    private fixInvalidTypes;
+    private fixInputIndices;
+    private fixDuplicateConnections;
     private processVersionUpgradeFixes;
     private processVersionMigrationFixes;
 }

dist/services/workflow-auto-fixer.d.ts.map

@@ -1 +1 @@
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dist/services/workflow-auto-fixer.js

@@ -3,9 +3,10 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.WorkflowAutoFixer = void 0;
+exports.WorkflowAutoFixer = exports.CONNECTION_FIX_TYPES = void 0;
 exports.isNodeFormatIssue = isNodeFormatIssue;
 const crypto_1 = __importDefault(require("crypto"));
+const workflow_validator_1 = require("./workflow-validator");
 const node_similarity_service_1 = require("./node-similarity-service");
 const logger_1 = require("../utils/logger");
 const node_version_service_1 = require("./node-version-service");
@@ -13,6 +14,13 @@ const breaking_change_detector_1 = require("./breaking-change-detector");
 const node_migration_service_1 = require("./node-migration-service");
 const post_update_validator_1 = require("./post-update-validator");
 const logger = new logger_1.Logger({ prefix: '[WorkflowAutoFixer]' });
+exports.CONNECTION_FIX_TYPES = [
+    'connection-numeric-keys',
+    'connection-invalid-type',
+    'connection-id-to-name',
+    'connection-duplicate-removal',
+    'connection-input-index'
+];
 function isNodeFormatIssue(issue) {
     return 'nodeName' in issue && 'nodeId' in issue &&
         typeof issue.nodeName === 'string' &&
@@ -72,6 +80,7 @@ class WorkflowAutoFixer {
         if (!fullConfig.fixTypes || fullConfig.fixTypes.includes('version-migration')) {
             await this.processVersionMigrationFixes(workflow, nodeMap, operations, fixes, postUpdateGuidance);
         }
+        this.processConnectionFixes(workflow, validationResult, fullConfig, operations, fixes);
         const filteredFixes = this.filterByConfidence(fixes, fullConfig.confidenceThreshold);
         const filteredOperations = this.filterOperationsByFixes(operations, filteredFixes, fixes);
         const limitedFixes = filteredFixes.slice(0, fullConfig.maxFixes);
@@ -393,10 +402,14 @@ class WorkflowAutoFixer {
     }
     filterOperationsByFixes(operations, filteredFixes, allFixes) {
         const fixedNodes = new Set(filteredFixes.map(f => f.node));
+        const hasConnectionFixes = filteredFixes.some(f => exports.CONNECTION_FIX_TYPES.includes(f.type));
         return operations.filter(op => {
             if (op.type === 'updateNode') {
                 return fixedNodes.has(op.nodeId || '');
             }
+            if (op.type === 'replaceConnections') {
+                return hasConnectionFixes;
+            }
             return true;
         });
     }
@@ -411,7 +424,12 @@ class WorkflowAutoFixer {
                 'webhook-missing-path': 0,
                 'typeversion-upgrade': 0,
                 'version-migration': 0,
-                'tool-variant-correction': 0
+                'tool-variant-correction': 0,
+                'connection-numeric-keys': 0,
+                'connection-invalid-type': 0,
+                'connection-id-to-name': 0,
+                'connection-duplicate-removal': 0,
+                'connection-input-index': 0
             },
             byConfidence: {
                 'high': 0,
@@ -454,11 +472,299 @@ class WorkflowAutoFixer {
         if (stats.byType['tool-variant-correction'] > 0) {
             parts.push(`${stats.byType['tool-variant-correction']} tool variant ${stats.byType['tool-variant-correction'] === 1 ? 'correction' : 'corrections'}`);
         }
+        const connectionIssueCount = (stats.byType['connection-numeric-keys'] || 0) +
+            (stats.byType['connection-invalid-type'] || 0) +
+            (stats.byType['connection-id-to-name'] || 0) +
+            (stats.byType['connection-duplicate-removal'] || 0) +
+            (stats.byType['connection-input-index'] || 0);
+        if (connectionIssueCount > 0) {
+            parts.push(`${connectionIssueCount} connection ${connectionIssueCount === 1 ? 'issue' : 'issues'}`);
+        }
         if (parts.length === 0) {
             return `Fixed ${stats.total} ${stats.total === 1 ? 'issue' : 'issues'}`;
         }
         return `Fixed ${parts.join(', ')}`;
     }
+    processConnectionFixes(workflow, validationResult, config, operations, fixes) {
+        if (!workflow.connections || Object.keys(workflow.connections).length === 0) {
+            return;
+        }
+        const idToNameMap = new Map();
+        const nameSet = new Set();
+        for (const node of workflow.nodes) {
+            idToNameMap.set(node.id, node.name);
+            nameSet.add(node.name);
+        }
+        const conn = JSON.parse(JSON.stringify(workflow.connections));
+        let anyFixed = false;
+        if (!config.fixTypes || config.fixTypes.includes('connection-numeric-keys')) {
+            const numericKeyResult = this.fixNumericKeys(conn);
+            if (numericKeyResult.length > 0) {
+                fixes.push(...numericKeyResult);
+                anyFixed = true;
+            }
+        }
+        if (!config.fixTypes || config.fixTypes.includes('connection-id-to-name')) {
+            const idToNameResult = this.fixIdToName(conn, idToNameMap, nameSet);
+            if (idToNameResult.length > 0) {
+                fixes.push(...idToNameResult);
+                anyFixed = true;
+            }
+        }
+        if (!config.fixTypes || config.fixTypes.includes('connection-invalid-type')) {
+            const invalidTypeResult = this.fixInvalidTypes(conn);
+            if (invalidTypeResult.length > 0) {
+                fixes.push(...invalidTypeResult);
+                anyFixed = true;
+            }
+        }
+        if (!config.fixTypes || config.fixTypes.includes('connection-input-index')) {
+            const inputIndexResult = this.fixInputIndices(conn, validationResult, workflow);
+            if (inputIndexResult.length > 0) {
+                fixes.push(...inputIndexResult);
+                anyFixed = true;
+            }
+        }
+        if (!config.fixTypes || config.fixTypes.includes('connection-duplicate-removal')) {
+            const dedupResult = this.fixDuplicateConnections(conn);
+            if (dedupResult.length > 0) {
+                fixes.push(...dedupResult);
+                anyFixed = true;
+            }
+        }
+        if (anyFixed) {
+            const op = {
+                type: 'replaceConnections',
+                connections: conn
+            };
+            operations.push(op);
+        }
+    }
+    fixNumericKeys(conn) {
+        const fixes = [];
+        const sourceNodes = Object.keys(conn);
+        for (const sourceName of sourceNodes) {
+            const nodeConn = conn[sourceName];
+            const numericKeys = Object.keys(nodeConn).filter(k => /^\d+$/.test(k));
+            if (numericKeys.length === 0)
+                continue;
+            if (!nodeConn['main']) {
+                nodeConn['main'] = [];
+            }
+            for (const numKey of numericKeys) {
+                const index = parseInt(numKey, 10);
+                const entries = nodeConn[numKey];
+                while (nodeConn['main'].length <= index) {
+                    nodeConn['main'].push([]);
+                }
+                const hadExisting = nodeConn['main'][index] && nodeConn['main'][index].length > 0;
+                if (Array.isArray(entries)) {
+                    for (const outputGroup of entries) {
+                        if (Array.isArray(outputGroup)) {
+                            nodeConn['main'][index] = [
+                                ...nodeConn['main'][index],
+                                ...outputGroup
+                            ];
+                        }
+                    }
+                }
+                if (hadExisting) {
+                    logger.warn(`Merged numeric key "${numKey}" into existing main[${index}] on node "${sourceName}" - dedup pass will clean exact duplicates`);
+                }
+                fixes.push({
+                    node: sourceName,
+                    field: `connections.${sourceName}.${numKey}`,
+                    type: 'connection-numeric-keys',
+                    before: numKey,
+                    after: `main[${index}]`,
+                    confidence: hadExisting ? 'medium' : 'high',
+                    description: hadExisting
+                        ? `Merged numeric connection key "${numKey}" into existing main[${index}] on node "${sourceName}"`
+                        : `Converted numeric connection key "${numKey}" to main[${index}] on node "${sourceName}"`
+                });
+                delete nodeConn[numKey];
+            }
+        }
+        return fixes;
+    }
+    fixIdToName(conn, idToNameMap, nameSet) {
+        const fixes = [];
+        const renames = [];
+        const sourceKeys = Object.keys(conn);
+        for (const sourceKey of sourceKeys) {
+            if (idToNameMap.has(sourceKey) && !nameSet.has(sourceKey)) {
+                renames.push({ oldKey: sourceKey, newKey: idToNameMap.get(sourceKey) });
+            }
+        }
+        const newKeyCount = new Map();
+        for (const r of renames) {
+            newKeyCount.set(r.newKey, (newKeyCount.get(r.newKey) || 0) + 1);
+        }
+        const safeRenames = renames.filter(r => {
+            if ((newKeyCount.get(r.newKey) || 0) > 1) {
+                logger.warn(`Skipping ambiguous ID-to-name rename: "${r.oldKey}" → "${r.newKey}" (multiple IDs map to same name)`);
+                return false;
+            }
+            return true;
+        });
+        for (const { oldKey, newKey } of safeRenames) {
+            conn[newKey] = conn[oldKey];
+            delete conn[oldKey];
+            fixes.push({
+                node: newKey,
+                field: `connections.sourceKey`,
+                type: 'connection-id-to-name',
+                before: oldKey,
+                after: newKey,
+                confidence: 'high',
+                description: `Replaced node ID "${oldKey}" with name "${newKey}" as connection source key`
+            });
+        }
+        for (const sourceName of Object.keys(conn)) {
+            const nodeConn = conn[sourceName];
+            for (const outputKey of Object.keys(nodeConn)) {
+                const outputs = nodeConn[outputKey];
+                if (!Array.isArray(outputs))
+                    continue;
+                for (const outputGroup of outputs) {
+                    if (!Array.isArray(outputGroup))
+                        continue;
+                    for (const entry of outputGroup) {
+                        if (entry && entry.node && idToNameMap.has(entry.node) && !nameSet.has(entry.node)) {
+                            const oldNode = entry.node;
+                            const newNode = idToNameMap.get(entry.node);
+                            entry.node = newNode;
+                            fixes.push({
+                                node: sourceName,
+                                field: `connections.${sourceName}.${outputKey}[].node`,
+                                type: 'connection-id-to-name',
+                                before: oldNode,
+                                after: newNode,
+                                confidence: 'high',
+                                description: `Replaced target node ID "${oldNode}" with name "${newNode}" in connection from "${sourceName}"`
+                            });
+                        }
+                    }
+                }
+            }
+        }
+        return fixes;
+    }
+    fixInvalidTypes(conn) {
+        const fixes = [];
+        for (const sourceName of Object.keys(conn)) {
+            const nodeConn = conn[sourceName];
+            for (const outputKey of Object.keys(nodeConn)) {
+                const outputs = nodeConn[outputKey];
+                if (!Array.isArray(outputs))
+                    continue;
+                for (const outputGroup of outputs) {
+                    if (!Array.isArray(outputGroup))
+                        continue;
+                    for (const entry of outputGroup) {
+                        if (entry && entry.type && !workflow_validator_1.VALID_CONNECTION_TYPES.has(entry.type)) {
+                            const oldType = entry.type;
+                            const newType = workflow_validator_1.VALID_CONNECTION_TYPES.has(outputKey) ? outputKey : 'main';
+                            entry.type = newType;
+                            fixes.push({
+                                node: sourceName,
+                                field: `connections.${sourceName}.${outputKey}[].type`,
+                                type: 'connection-invalid-type',
+                                before: oldType,
+                                after: newType,
+                                confidence: 'high',
+                                description: `Fixed invalid connection type "${oldType}" → "${newType}" in connection from "${sourceName}" to "${entry.node}"`
+                            });
+                        }
+                    }
+                }
+            }
+        }
+        return fixes;
+    }
+    fixInputIndices(conn, validationResult, workflow) {
+        const fixes = [];
+        for (const error of validationResult.errors) {
+            if (error.code !== 'INPUT_INDEX_OUT_OF_BOUNDS')
+                continue;
+            const targetNodeName = error.nodeName;
+            if (!targetNodeName)
+                continue;
+            const match = error.message.match(/Input index (\d+).*?has (\d+) main input/);
+            if (!match) {
+                logger.warn(`Could not parse INPUT_INDEX_OUT_OF_BOUNDS error for node "${targetNodeName}": ${error.message}`);
+                continue;
+            }
+            const badIndex = parseInt(match[1], 10);
+            const inputCount = parseInt(match[2], 10);
+            const clampedIndex = inputCount > 1 ? Math.min(badIndex, inputCount - 1) : 0;
+            for (const sourceName of Object.keys(conn)) {
+                const nodeConn = conn[sourceName];
+                for (const outputKey of Object.keys(nodeConn)) {
+                    const outputs = nodeConn[outputKey];
+                    if (!Array.isArray(outputs))
+                        continue;
+                    for (const outputGroup of outputs) {
+                        if (!Array.isArray(outputGroup))
+                            continue;
+                        for (const entry of outputGroup) {
+                            if (entry && entry.node === targetNodeName && entry.index === badIndex) {
+                                entry.index = clampedIndex;
+                                fixes.push({
+                                    node: sourceName,
+                                    field: `connections.${sourceName}.${outputKey}[].index`,
+                                    type: 'connection-input-index',
+                                    before: badIndex,
+                                    after: clampedIndex,
+                                    confidence: 'medium',
+                                    description: `Clamped input index ${badIndex} → ${clampedIndex} for target node "${targetNodeName}" (has ${inputCount} input${inputCount === 1 ? '' : 's'})`
+                                });
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return fixes;
+    }
+    fixDuplicateConnections(conn) {
+        const fixes = [];
+        for (const sourceName of Object.keys(conn)) {
+            const nodeConn = conn[sourceName];
+            for (const outputKey of Object.keys(nodeConn)) {
+                const outputs = nodeConn[outputKey];
+                if (!Array.isArray(outputs))
+                    continue;
+                for (let i = 0; i < outputs.length; i++) {
+                    const outputGroup = outputs[i];
+                    if (!Array.isArray(outputGroup))
+                        continue;
+                    const seen = new Set();
+                    const deduped = [];
+                    for (const entry of outputGroup) {
+                        const key = JSON.stringify({ node: entry.node, type: entry.type, index: entry.index });
+                        if (seen.has(key)) {
+                            fixes.push({
+                                node: sourceName,
+                                field: `connections.${sourceName}.${outputKey}[${i}]`,
+                                type: 'connection-duplicate-removal',
+                                before: entry,
+                                after: null,
+                                confidence: 'high',
+                                description: `Removed duplicate connection from "${sourceName}" to "${entry.node}" (type: ${entry.type}, index: ${entry.index})`
+                            });
+                        }
+                        else {
+                            seen.add(key);
+                            deduped.push(entry);
+                        }
+                    }
+                    outputs[i] = deduped;
+                }
+            }
+        }
+        return fixes;
+    }
     async processVersionUpgradeFixes(workflow, nodeMap, operations, fixes, postUpdateGuidance) {
         if (!this.versionService || !this.migrationService || !this.postUpdateValidator) {
             logger.warn('Version services not initialized. Skipping version upgrade fixes.');

dist/services/workflow-diff-engine.d.ts

@@ -3,6 +3,10 @@ import { Workflow } from '../types/n8n-api';
 export declare class WorkflowDiffEngine {
     private renameMap;
     private warnings;
+    private modifiedNodeIds;
+    private removedNodeNames;
+    private tagsToAdd;
+    private tagsToRemove;
     applyDiff(workflow: Workflow, request: WorkflowDiffRequest): Promise<WorkflowDiffResult>;
     private validateOperation;
     private applyOperation;

dist/services/workflow-diff-engine.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"workflow-diff-engine.d.ts","sourceRoot":"","sources":["../../src/services/workflow-diff-engine.ts"],"names":[],"mappings":"AAMA,OAAO,EAEL,mBAAmB,EACnB,kBAAkB,EAsBnB,MAAM,wBAAwB,CAAC;AAChC,OAAO,EAAE,QAAQ,EAAoC,MAAM,kBAAkB,CAAC;AAQ9E,qBAAa,kBAAkB;IAE7B,OAAO,CAAC,SAAS,CAAkC;IAEnD,OAAO,CAAC,QAAQ,CAAqC;IAK/C,SAAS,CACb,QAAQ,EAAE,QAAQ,EAClB,OAAO,EAAE,mBAAmB,GAC3B,OAAO,CAAC,kBAAkB,CAAC;IA0M9B,OAAO,CAAC,iBAAiB;IAwCzB,OAAO,CAAC,cAAc;IAyDtB,OAAO,CAAC,eAAe;IAwBvB,OAAO,CAAC,kBAAkB;IAuB1B,OAAO,CAAC,kBAAkB;IAoC1B,OAAO,CAAC,gBAAgB;IAQxB,OAAO,CAAC,kBAAkB;IAU1B,OAAO,CAAC,qBAAqB;IAkD7B,OAAO,CAAC,wBAAwB;IAuChC,OAAO,CAAC,wBAAwB;IAmDhC,OAAO,CAAC,YAAY;IA2BpB,OAAO,CAAC,eAAe;IAkCvB,OAAO,CAAC,eAAe;IAwBvB,OAAO,CAAC,aAAa;IAOrB,OAAO,CAAC,eAAe;IAOvB,OAAO,CAAC,gBAAgB;IAWxB,OAAO,CAAC,sBAAsB;IAgD9B,OAAO,CAAC,kBAAkB;IA4C1B,OAAO,CAAC,qBAAqB;IA2C7B,OAAO,CAAC,qBAAqB;IA0B7B,OAAO,CAAC,mBAAmB;IAW3B,OAAO,CAAC,eAAe;IAIvB,OAAO,CAAC,WAAW;IASnB,OAAO,CAAC,cAAc;IAUtB,OAAO,CAAC,wBAAwB;IAchC,OAAO,CAAC,0BAA0B;IAMlC,OAAO,CAAC,qBAAqB;IAM7B,OAAO,CAAC,uBAAuB;IAO/B,OAAO,CAAC,6BAA6B;IAKrC,OAAO,CAAC,0BAA0B;IA0BlC,OAAO,CAAC,0BAA0B;IA0ElC,OAAO,CAAC,uBAAuB;IAe/B,OAAO,CAAC,0BAA0B;IAkElC,OAAO,CAAC,iBAAiB;IAkBzB,OAAO,CAAC,QAAQ;IAsChB,OAAO,CAAC,uBAAuB;IAW/B,OAAO,CAAC,iBAAiB;CAc1B"}
+{"version":3,"file":"workflow-diff-engine.d.ts","sourceRoot":"","sources":["../../src/services/workflow-diff-engine.ts"],"names":[],"mappings":"AAMA,OAAO,EAEL,mBAAmB,EACnB,kBAAkB,EAsBnB,MAAM,wBAAwB,CAAC;AAChC,OAAO,EAAE,QAAQ,EAAoC,MAAM,kBAAkB,CAAC;AAY9E,qBAAa,kBAAkB;IAE7B,OAAO,CAAC,SAAS,CAAkC;IAEnD,OAAO,CAAC,QAAQ,CAAqC;IAErD,OAAO,CAAC,eAAe,CAAqB;IAE5C,OAAO,CAAC,gBAAgB,CAAqB;IAE7C,OAAO,CAAC,SAAS,CAAgB;IACjC,OAAO,CAAC,YAAY,CAAgB;IAK9B,SAAS,CACb,QAAQ,EAAE,QAAQ,EAClB,OAAO,EAAE,mBAAmB,GAC3B,OAAO,CAAC,kBAAkB,CAAC;IAqN9B,OAAO,CAAC,iBAAiB;IAwCzB,OAAO,CAAC,cAAc;IAyDtB,OAAO,CAAC,eAAe;IAwBvB,OAAO,CAAC,kBAAkB;IAuB1B,OAAO,CAAC,kBAAkB;IAoC1B,OAAO,CAAC,gBAAgB;IAQxB,OAAO,CAAC,kBAAkB;IAU1B,OAAO,CAAC,qBAAqB;IAkD7B,OAAO,CAAC,wBAAwB;IA6ChC,OAAO,CAAC,wBAAwB;IAmDhC,OAAO,CAAC,YAAY;IA4BpB,OAAO,CAAC,eAAe;IAwCvB,OAAO,CAAC,eAAe;IA0BvB,OAAO,CAAC,aAAa;IAOrB,OAAO,CAAC,eAAe;IAOvB,OAAO,CAAC,gBAAgB;IAWxB,OAAO,CAAC,sBAAsB;IAwD9B,OAAO,CAAC,kBAAkB;IA6C1B,OAAO,CAAC,qBAAqB;IAuC7B,OAAO,CAAC,qBAAqB;IA0B7B,OAAO,CAAC,mBAAmB;IAW3B,OAAO,CAAC,eAAe;IAIvB,OAAO,CAAC,WAAW;IAYnB,OAAO,CAAC,cAAc;IAatB,OAAO,CAAC,wBAAwB;IAchC,OAAO,CAAC,0BAA0B;IAMlC,OAAO,CAAC,qBAAqB;IAM7B,OAAO,CAAC,uBAAuB;IAO/B,OAAO,CAAC,6BAA6B;IAKrC,OAAO,CAAC,0BAA0B;IA0BlC,OAAO,CAAC,0BAA0B;IA+ElC,OAAO,CAAC,uBAAuB;IAe/B,OAAO,CAAC,0BAA0B;IAkElC,OAAO,CAAC,iBAAiB;IAkBzB,OAAO,CAAC,QAAQ;IAsChB,OAAO,CAAC,uBAAuB;IAW/B,OAAO,CAAC,iBAAiB;CAoB1B"}

dist/services/workflow-diff-engine.js

@@ -10,11 +10,19 @@ class WorkflowDiffEngine {
     constructor() {
         this.renameMap = new Map();
         this.warnings = [];
+        this.modifiedNodeIds = new Set();
+        this.removedNodeNames = new Set();
+        this.tagsToAdd = [];
+        this.tagsToRemove = [];
     }
     async applyDiff(workflow, request) {
         try {
             this.renameMap.clear();
             this.warnings = [];
+            this.modifiedNodeIds.clear();
+            this.removedNodeNames.clear();
+            this.tagsToAdd = [];
+            this.tagsToRemove = [];
             const workflowCopy = JSON.parse(JSON.stringify(workflow));
             const nodeOperationTypes = ['addNode', 'removeNode', 'updateNode', 'moveNode', 'enableNode', 'disableNode'];
             const nodeOperations = [];
@@ -82,7 +90,9 @@ class WorkflowDiffEngine {
                     errors: errors.length > 0 ? errors : undefined,
                     warnings: this.warnings.length > 0 ? this.warnings : undefined,
                     applied: appliedIndices,
-                    failed: failedIndices
+                    failed: failedIndices,
+                    tagsToAdd: this.tagsToAdd.length > 0 ? this.tagsToAdd : undefined,
+                    tagsToRemove: this.tagsToRemove.length > 0 ? this.tagsToRemove : undefined
                 };
             }
             else {
@@ -142,8 +152,15 @@ class WorkflowDiffEngine {
                         };
                     }
                 }
-                workflowCopy.nodes = workflowCopy.nodes.map((node) => (0, node_sanitizer_1.sanitizeNode)(node));
-                logger.debug('Applied full-workflow sanitization to all nodes');
+                if (this.modifiedNodeIds.size > 0) {
+                    workflowCopy.nodes = workflowCopy.nodes.map((node) => {
+                        if (this.modifiedNodeIds.has(node.id)) {
+                            return (0, node_sanitizer_1.sanitizeNode)(node);
+                        }
+                        return node;
+                    });
+                    logger.debug(`Sanitized ${this.modifiedNodeIds.size} modified nodes`);
+                }
                 if (request.validateOnly) {
                     return {
                         success: true,
@@ -162,7 +179,9 @@ class WorkflowDiffEngine {
                     message: `Successfully applied ${operationsApplied} operations (${nodeOperations.length} node ops, ${otherOperations.length} other ops)`,
                     warnings: this.warnings.length > 0 ? this.warnings : undefined,
                     shouldActivate: shouldActivate || undefined,
-                    shouldDeactivate: shouldDeactivate || undefined
+                    shouldDeactivate: shouldDeactivate || undefined,
+                    tagsToAdd: this.tagsToAdd.length > 0 ? this.tagsToAdd : undefined,
+                    tagsToRemove: this.tagsToRemove.length > 0 ? this.tagsToRemove : undefined
                 };
             }
         }
@@ -302,7 +321,7 @@ class WorkflowDiffEngine {
             return `Invalid parameter 'changes'. The updateNode operation requires 'updates' (not 'changes'). Example: {type: "updateNode", nodeId: "abc", updates: {name: "New Name", "parameters.url": "https://example.com"}}`;
         }
         if (!operation.updates) {
-            return `Missing required parameter 'updates'. The updateNode operation requires an 'updates' object containing properties to modify. Example: {type: "updateNode", nodeId: "abc", updates: {name: "New Name"}}`;
+            return `Missing required parameter 'updates'. The updateNode operation requires an 'updates' object. Correct structure: {type: "updateNode", nodeId: "abc-123" OR nodeName: "My Node", updates: {name: "New Name", "parameters.url": "https://example.com"}}`;
         }
         const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
         if (!node) {
@@ -382,12 +401,18 @@ class WorkflowDiffEngine {
         const sourceNode = this.findNode(workflow, operation.source, operation.source);
         const targetNode = this.findNode(workflow, operation.target, operation.target);
         if (!sourceNode) {
+            if (this.removedNodeNames.has(operation.source)) {
+                return `Source node "${operation.source}" was already removed by a prior removeNode operation. Its connections were automatically cleaned up — no separate removeConnection needed.`;
+            }
             const availableNodes = workflow.nodes
                 .map(n => `"${n.name}" (id: ${n.id.substring(0, 8)}...)`)
                 .join(', ');
             return `Source node not found: "${operation.source}". Available nodes: ${availableNodes}. Tip: Use node ID for names with special characters.`;
         }
         if (!targetNode) {
+            if (this.removedNodeNames.has(operation.target)) {
+                return `Target node "${operation.target}" was already removed by a prior removeNode operation. Its connections were automatically cleaned up — no separate removeConnection needed.`;
+            }
             const availableNodes = workflow.nodes
                 .map(n => `"${n.name}" (id: ${n.id.substring(0, 8)}...)`)
                 .join(', ');
@@ -461,34 +486,40 @@ class WorkflowDiffEngine {
             executeOnce: operation.node.executeOnce
         };
         const sanitizedNode = (0, node_sanitizer_1.sanitizeNode)(newNode);
+        this.modifiedNodeIds.add(sanitizedNode.id);
         workflow.nodes.push(sanitizedNode);
     }
     applyRemoveNode(workflow, operation) {
         const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
         if (!node)
             return;
+        this.removedNodeNames.add(node.name);
         const index = workflow.nodes.findIndex(n => n.id === node.id);
         if (index !== -1) {
             workflow.nodes.splice(index, 1);
         }
         delete workflow.connections[node.name];
-        Object.keys(workflow.connections).forEach(sourceName => {
-            const sourceConnections = workflow.connections[sourceName];
-            Object.keys(sourceConnections).forEach(outputName => {
-                sourceConnections[outputName] = sourceConnections[outputName].map(connections => connections.filter(conn => conn.node !== node.name)).filter(connections => connections.length > 0);
-                if (sourceConnections[outputName].length === 0) {
+        for (const [sourceName, sourceConnections] of Object.entries(workflow.connections)) {
+            for (const [outputName, outputConns] of Object.entries(sourceConnections)) {
+                sourceConnections[outputName] = outputConns.map(connections => connections.filter(conn => conn.node !== node.name));
+                const trimmed = sourceConnections[outputName];
+                while (trimmed.length > 0 && trimmed[trimmed.length - 1].length === 0) {
+                    trimmed.pop();
+                }
+                if (trimmed.length === 0) {
                     delete sourceConnections[outputName];
                 }
-            });
+            }
             if (Object.keys(sourceConnections).length === 0) {
                 delete workflow.connections[sourceName];
             }
-        });
+        }
     }
     applyUpdateNode(workflow, operation) {
         const node = this.findNode(workflow, operation.nodeId, operation.nodeName);
         if (!node)
             return;
+        this.modifiedNodeIds.add(node.id);
         if (operation.updates.name && operation.updates.name !== node.name) {
             const oldName = node.name;
             const newName = operation.updates.name;
@@ -521,8 +552,13 @@ class WorkflowDiffEngine {
     }
     resolveSmartParameters(workflow, operation) {
         const sourceNode = this.findNode(workflow, operation.source, operation.source);
-        let sourceOutput = operation.sourceOutput ?? 'main';
+        let sourceOutput = String(operation.sourceOutput ?? 'main');
         let sourceIndex = operation.sourceIndex ?? 0;
+        if (/^\d+$/.test(sourceOutput) && operation.sourceIndex === undefined
+            && operation.branch === undefined && operation.case === undefined) {
+            sourceIndex = parseInt(sourceOutput, 10);
+            sourceOutput = 'main';
+        }
         if (operation.branch !== undefined && operation.sourceIndex === undefined) {
             if (sourceNode?.type === 'n8n-nodes-base.if') {
                 sourceIndex = operation.branch === 'true' ? 0 : 1;
@@ -556,7 +592,7 @@ class WorkflowDiffEngine {
         if (!sourceNode || !targetNode)
             return;
         const { sourceOutput, sourceIndex } = this.resolveSmartParameters(workflow, operation);
-        const targetInput = operation.targetInput ?? sourceOutput;
+        const targetInput = String(operation.targetInput ?? sourceOutput);
         const targetIndex = operation.targetIndex ?? 0;
         if (!workflow.connections[sourceNode.name]) {
             workflow.connections[sourceNode.name] = {};
@@ -581,12 +617,9 @@ class WorkflowDiffEngine {
         const sourceNode = this.findNode(workflow, operation.source, operation.source);
         const targetNode = this.findNode(workflow, operation.target, operation.target);
         if (!sourceNode || !targetNode) {
-            if (operation.ignoreErrors) {
-                return;
-            }
             return;
         }
-        const sourceOutput = operation.sourceOutput || 'main';
+        const sourceOutput = String(operation.sourceOutput ?? 'main');
         const connections = workflow.connections[sourceNode.name]?.[sourceOutput];
         if (!connections)
             return;
@@ -633,19 +666,21 @@ class WorkflowDiffEngine {
         workflow.name = operation.name;
     }
     applyAddTag(workflow, operation) {
-        if (!workflow.tags) {
-            workflow.tags = [];
+        const removeIdx = this.tagsToRemove.indexOf(operation.tag);
+        if (removeIdx !== -1) {
+            this.tagsToRemove.splice(removeIdx, 1);
         }
-        if (!workflow.tags.includes(operation.tag)) {
-            workflow.tags.push(operation.tag);
+        if (!this.tagsToAdd.includes(operation.tag)) {
+            this.tagsToAdd.push(operation.tag);
         }
     }
     applyRemoveTag(workflow, operation) {
-        if (!workflow.tags)
-            return;
-        const index = workflow.tags.indexOf(operation.tag);
-        if (index !== -1) {
-            workflow.tags.splice(index, 1);
+        const addIdx = this.tagsToAdd.indexOf(operation.tag);
+        if (addIdx !== -1) {
+            this.tagsToAdd.splice(addIdx, 1);
+        }
+        if (!this.tagsToRemove.includes(operation.tag)) {
+            this.tagsToRemove.push(operation.tag);
         }
     }
     validateActivateWorkflow(workflow, operation) {
@@ -734,7 +769,10 @@ class WorkflowDiffEngine {
                         return false;
                     }
                     return true;
-                })).filter(conns => conns.length > 0);
+                }));
+                while (filteredConnections.length > 0 && filteredConnections[filteredConnections.length - 1].length === 0) {
+                    filteredConnections.pop();
+                }
                 if (filteredConnections.length === 0) {
                     delete outputs[outputName];
                 }
@@ -818,12 +856,20 @@ class WorkflowDiffEngine {
         let current = obj;
         for (let i = 0; i < keys.length - 1; i++) {
             const key = keys[i];
-            if (!(key in current) || typeof current[key] !== 'object') {
+            if (!(key in current) || typeof current[key] !== 'object' || current[key] === null) {
+                if (value === null)
+                    return;
                 current[key] = {};
             }
             current = current[key];
         }
-        current[keys[keys.length - 1]] = value;
+        const finalKey = keys[keys.length - 1];
+        if (value === null) {
+            delete current[finalKey];
+        }
+        else {
+            current[finalKey] = value;
+        }
     }
 }
 exports.WorkflowDiffEngine = WorkflowDiffEngine;

dist/services/workflow-validator.d.ts

@@ -1,5 +1,6 @@
 import { NodeRepository } from '../database/node-repository';
 import { EnhancedConfigValidator } from './enhanced-config-validator';
+export declare const VALID_CONNECTION_TYPES: Set<string>;
 interface WorkflowNode {
     id: string;
     name: string;
@@ -21,17 +22,7 @@ interface WorkflowNode {
 }
 interface WorkflowConnection {
     [sourceNode: string]: {
-        main?: Array<Array<{
-            node: string;
-            type: string;
-            index: number;
-        }>>;
-        error?: Array<Array<{
-            node: string;
-            type: string;
-            index: number;
-        }>>;
-        ai_tool?: Array<Array<{
+        [outputType: string]: Array<Array<{
             node: string;
             type: string;
             index: number;
@@ -94,6 +85,15 @@ export declare class WorkflowValidator {
     private validateErrorOutputConfiguration;
     private validateAIToolConnection;
     private validateAIToolSource;
+    private getNodeOutputTypes;
+    private validateNotAISubNode;
+    private getShortNodeType;
+    private getConditionalOutputInfo;
+    private validateOutputIndexBounds;
+    private validateConditionalBranchUsage;
+    private validateInputIndexBounds;
+    private flagOrphanedNodes;
+    private validateTriggerReachability;
     private hasCycle;
     private validateExpressions;
     private countExpressionsInObject;

dist/services/workflow-validator.d.ts.map

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dist/services/workflow-validator.js

@@ -3,7 +3,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.WorkflowValidator = void 0;
+exports.WorkflowValidator = exports.VALID_CONNECTION_TYPES = void 0;
 const crypto_1 = __importDefault(require("crypto"));
 const expression_validator_1 = require("./expression-validator");
 const expression_format_validator_1 = require("./expression-format-validator");
@@ -16,6 +16,15 @@ const node_type_utils_1 = require("../utils/node-type-utils");
 const node_classification_1 = require("../utils/node-classification");
 const tool_variant_generator_1 = require("./tool-variant-generator");
 const logger = new logger_1.Logger({ prefix: '[WorkflowValidator]' });
+exports.VALID_CONNECTION_TYPES = new Set([
+    'main',
+    'error',
+    ...ai_node_validator_1.AI_CONNECTION_TYPES,
+    'ai_agent',
+    'ai_chain',
+    'ai_retriever',
+    'ai_reranker',
+]);
 class WorkflowValidator {
     constructor(nodeRepository, nodeValidator) {
         this.nodeRepository = nodeRepository;
@@ -393,51 +402,37 @@ class WorkflowValidator {
                 result.statistics.invalidConnections++;
                 continue;
             }
-            if (outputs.main) {
-                this.validateConnectionOutputs(sourceName, outputs.main, nodeMap, nodeIdMap, result, 'main');
-            }
-            if (outputs.error) {
-                this.validateConnectionOutputs(sourceName, outputs.error, nodeMap, nodeIdMap, result, 'error');
-            }
-            if (outputs.ai_tool) {
-                this.validateAIToolSource(sourceNode, result);
-                this.validateConnectionOutputs(sourceName, outputs.ai_tool, nodeMap, nodeIdMap, result, 'ai_tool');
+            for (const [outputKey, outputConnections] of Object.entries(outputs)) {
+                if (!exports.VALID_CONNECTION_TYPES.has(outputKey)) {
+                    let suggestion = '';
+                    if (/^\d+$/.test(outputKey)) {
+                        suggestion = ` If you meant to use output index ${outputKey}, use main[${outputKey}] instead.`;
+                    }
+                    result.errors.push({
+                        type: 'error',
+                        nodeName: sourceName,
+                        message: `Unknown connection output key "${outputKey}" on node "${sourceName}". Valid keys are: ${[...exports.VALID_CONNECTION_TYPES].join(', ')}.${suggestion}`,
+                        code: 'UNKNOWN_CONNECTION_KEY'
+                    });
+                    result.statistics.invalidConnections++;
+                    continue;
+                }
+                if (!outputConnections || !Array.isArray(outputConnections))
+                    continue;
+                if (outputKey === 'ai_tool') {
+                    this.validateAIToolSource(sourceNode, result);
+                }
+                if (outputKey === 'main') {
+                    this.validateNotAISubNode(sourceNode, result);
+                }
+                this.validateConnectionOutputs(sourceName, outputConnections, nodeMap, nodeIdMap, result, outputKey);
             }
         }
-        const connectedNodes = new Set();
-        Object.keys(workflow.connections).forEach(name => connectedNodes.add(name));
-        Object.values(workflow.connections).forEach(outputs => {
-            if (outputs.main) {
-                outputs.main.flat().forEach(conn => {
-                    if (conn)
-                        connectedNodes.add(conn.node);
-                });
-            }
-            if (outputs.error) {
-                outputs.error.flat().forEach(conn => {
-                    if (conn)
-                        connectedNodes.add(conn.node);
-                });
-            }
-            if (outputs.ai_tool) {
-                outputs.ai_tool.flat().forEach(conn => {
-                    if (conn)
-                        connectedNodes.add(conn.node);
-                });
-            }
-        });
-        for (const node of workflow.nodes) {
-            if (node.disabled || (0, node_classification_1.isNonExecutableNode)(node.type))
-                continue;
-            const isNodeTrigger = (0, node_type_utils_1.isTriggerNode)(node.type);
-            if (!connectedNodes.has(node.name) && !isNodeTrigger) {
-                result.warnings.push({
-                    type: 'warning',
-                    nodeId: node.id,
-                    nodeName: node.name,
-                    message: 'Node is not connected to any other nodes'
-                });
-            }
+        if (profile !== 'minimal') {
+            this.validateTriggerReachability(workflow, result);
+        }
+        else {
+            this.flagOrphanedNodes(workflow, result);
         }
         if (profile !== 'minimal' && this.hasCycle(workflow)) {
             result.errors.push({
@@ -450,6 +445,8 @@ class WorkflowValidator {
         const sourceNode = nodeMap.get(sourceName);
         if (outputType === 'main' && sourceNode) {
             this.validateErrorOutputConfiguration(sourceName, sourceNode, outputs, nodeMap, result);
+            this.validateOutputIndexBounds(sourceNode, outputs, result);
+            this.validateConditionalBranchUsage(sourceNode, outputs, result);
         }
         outputs.forEach((outputConnections, outputIndex) => {
             if (!outputConnections)
@@ -463,6 +460,20 @@ class WorkflowValidator {
                     result.statistics.invalidConnections++;
                     return;
                 }
+                if (connection.type && !exports.VALID_CONNECTION_TYPES.has(connection.type)) {
+                    let suggestion = '';
+                    if (/^\d+$/.test(connection.type)) {
+                        suggestion = ` Numeric types are not valid - use "main", "error", or an AI connection type.`;
+                    }
+                    result.errors.push({
+                        type: 'error',
+                        nodeName: sourceName,
+                        message: `Invalid connection type "${connection.type}" in connection from "${sourceName}" to "${connection.node}". Expected "main", "error", or an AI connection type (ai_tool, ai_languageModel, etc.).${suggestion}`,
+                        code: 'INVALID_CONNECTION_TYPE'
+                    });
+                    result.statistics.invalidConnections++;
+                    return;
+                }
                 const isSplitInBatches = sourceNode && (sourceNode.type === 'n8n-nodes-base.splitInBatches' ||
                     sourceNode.type === 'nodes-base.splitInBatches');
                 if (isSplitInBatches) {
@@ -506,6 +517,9 @@ class WorkflowValidator {
                     if (outputType === 'ai_tool') {
                         this.validateAIToolConnection(sourceName, targetNode, result);
                     }
+                    if (outputType === 'main') {
+                        this.validateInputIndexBounds(sourceName, targetNode, connection, result);
+                    }
                 }
             });
         });
@@ -634,6 +648,254 @@ class WorkflowValidator {
             code: 'INVALID_AI_TOOL_SOURCE'
         });
     }
+    getNodeOutputTypes(nodeType) {
+        const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(nodeType);
+        const nodeInfo = this.nodeRepository.getNode(normalizedType);
+        if (!nodeInfo || !nodeInfo.outputs)
+            return null;
+        const outputs = nodeInfo.outputs;
+        if (!Array.isArray(outputs))
+            return null;
+        for (const output of outputs) {
+            if (typeof output === 'string' && output.startsWith('={{')) {
+                return null;
+            }
+        }
+        return outputs;
+    }
+    validateNotAISubNode(sourceNode, result) {
+        const outputTypes = this.getNodeOutputTypes(sourceNode.type);
+        if (!outputTypes)
+            return;
+        const hasMainOutput = outputTypes.some(t => t === 'main');
+        if (hasMainOutput)
+            return;
+        const aiTypes = outputTypes.filter(t => t !== 'main');
+        const expectedType = aiTypes[0] || 'ai_languageModel';
+        result.errors.push({
+            type: 'error',
+            nodeId: sourceNode.id,
+            nodeName: sourceNode.name,
+            message: `Node "${sourceNode.name}" (${sourceNode.type}) is an AI sub-node that outputs "${expectedType}" connections. ` +
+                `It cannot be used with "main" connections. Connect it to an AI Agent or Chain via "${expectedType}" instead.`,
+            code: 'AI_SUBNODE_MAIN_CONNECTION'
+        });
+    }
+    getShortNodeType(sourceNode) {
+        const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(sourceNode.type);
+        return normalizedType.replace(/^(n8n-)?nodes-base\./, '');
+    }
+    getConditionalOutputInfo(sourceNode) {
+        const shortType = this.getShortNodeType(sourceNode);
+        if (shortType === 'if' || shortType === 'filter') {
+            return { shortType, expectedOutputs: 2 };
+        }
+        if (shortType === 'switch') {
+            const rules = sourceNode.parameters?.rules?.values || sourceNode.parameters?.rules;
+            if (Array.isArray(rules)) {
+                return { shortType, expectedOutputs: rules.length + 1 };
+            }
+            return null;
+        }
+        return null;
+    }
+    validateOutputIndexBounds(sourceNode, outputs, result) {
+        const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(sourceNode.type);
+        const nodeInfo = this.nodeRepository.getNode(normalizedType);
+        if (!nodeInfo || !nodeInfo.outputs)
+            return;
+        let mainOutputCount;
+        if (Array.isArray(nodeInfo.outputs)) {
+            mainOutputCount = nodeInfo.outputs.filter((o) => typeof o === 'string' ? o === 'main' : (o.type === 'main' || !o.type)).length;
+        }
+        else {
+            return;
+        }
+        if (mainOutputCount === 0)
+            return;
+        const conditionalInfo = this.getConditionalOutputInfo(sourceNode);
+        if (conditionalInfo) {
+            mainOutputCount = conditionalInfo.expectedOutputs;
+        }
+        else if (this.getShortNodeType(sourceNode) === 'switch') {
+            return;
+        }
+        if (sourceNode.onError === 'continueErrorOutput') {
+            mainOutputCount += 1;
+        }
+        const maxOutputIndex = outputs.length - 1;
+        if (maxOutputIndex >= mainOutputCount) {
+            for (let i = mainOutputCount; i < outputs.length; i++) {
+                if (outputs[i] && outputs[i].length > 0) {
+                    result.errors.push({
+                        type: 'error',
+                        nodeId: sourceNode.id,
+                        nodeName: sourceNode.name,
+                        message: `Output index ${i} on node "${sourceNode.name}" exceeds its output count (${mainOutputCount}). ` +
+                            `This node has ${mainOutputCount} main output(s) (indices 0-${mainOutputCount - 1}).`,
+                        code: 'OUTPUT_INDEX_OUT_OF_BOUNDS'
+                    });
+                    result.statistics.invalidConnections++;
+                }
+            }
+        }
+    }
+    validateConditionalBranchUsage(sourceNode, outputs, result) {
+        const conditionalInfo = this.getConditionalOutputInfo(sourceNode);
+        if (!conditionalInfo || conditionalInfo.expectedOutputs < 2)
+            return;
+        const { shortType, expectedOutputs } = conditionalInfo;
+        const main0Count = outputs[0]?.length || 0;
+        if (main0Count < 2)
+            return;
+        const hasHigherIndexConnections = outputs.slice(1).some(conns => conns && conns.length > 0);
+        if (hasHigherIndexConnections)
+            return;
+        let message;
+        if (shortType === 'if' || shortType === 'filter') {
+            const isFilter = shortType === 'filter';
+            const displayName = isFilter ? 'Filter' : 'IF';
+            const trueLabel = isFilter ? 'matched' : 'true';
+            const falseLabel = isFilter ? 'unmatched' : 'false';
+            message = `${displayName} node "${sourceNode.name}" has ${main0Count} connections on the "${trueLabel}" branch (main[0]) ` +
+                `but no connections on the "${falseLabel}" branch (main[1]). ` +
+                `All ${main0Count} target nodes execute together on the "${trueLabel}" branch, ` +
+                `while the "${falseLabel}" branch has no effect. ` +
+                `Split connections: main[0] for ${trueLabel}, main[1] for ${falseLabel}.`;
+        }
+        else {
+            message = `Switch node "${sourceNode.name}" has ${main0Count} connections on output 0 ` +
+                `but no connections on any other outputs (1-${expectedOutputs - 1}). ` +
+                `All ${main0Count} target nodes execute together on output 0, ` +
+                `while other switch branches have no effect. ` +
+                `Distribute connections across outputs to match switch rules.`;
+        }
+        result.warnings.push({
+            type: 'warning',
+            nodeId: sourceNode.id,
+            nodeName: sourceNode.name,
+            message,
+            code: 'CONDITIONAL_BRANCH_FANOUT'
+        });
+    }
+    validateInputIndexBounds(sourceName, targetNode, connection, result) {
+        const normalizedType = node_type_normalizer_1.NodeTypeNormalizer.normalizeToFullForm(targetNode.type);
+        const nodeInfo = this.nodeRepository.getNode(normalizedType);
+        if (!nodeInfo)
+            return;
+        const shortType = normalizedType.replace(/^(n8n-)?nodes-base\./, '');
+        let mainInputCount = 1;
+        if (shortType === 'merge' || shortType === 'compareDatasets') {
+            mainInputCount = 2;
+        }
+        if (nodeInfo.isTrigger || (0, node_type_utils_1.isTriggerNode)(targetNode.type)) {
+            mainInputCount = 0;
+        }
+        if (mainInputCount > 0 && connection.index >= mainInputCount) {
+            result.errors.push({
+                type: 'error',
+                nodeName: targetNode.name,
+                message: `Input index ${connection.index} on node "${targetNode.name}" exceeds its input count (${mainInputCount}). ` +
+                    `Connection from "${sourceName}" targets input ${connection.index}, but this node has ${mainInputCount} main input(s) (indices 0-${mainInputCount - 1}).`,
+                code: 'INPUT_INDEX_OUT_OF_BOUNDS'
+            });
+            result.statistics.invalidConnections++;
+        }
+    }
+    flagOrphanedNodes(workflow, result) {
+        const connectedNodes = new Set();
+        for (const [sourceName, outputs] of Object.entries(workflow.connections)) {
+            connectedNodes.add(sourceName);
+            for (const outputConns of Object.values(outputs)) {
+                if (!Array.isArray(outputConns))
+                    continue;
+                for (const conns of outputConns) {
+                    if (!conns)
+                        continue;
+                    for (const conn of conns) {
+                        if (conn)
+                            connectedNodes.add(conn.node);
+                    }
+                }
+            }
+        }
+        for (const node of workflow.nodes) {
+            if (node.disabled || (0, node_classification_1.isNonExecutableNode)(node.type))
+                continue;
+            if ((0, node_type_utils_1.isTriggerNode)(node.type))
+                continue;
+            if (!connectedNodes.has(node.name)) {
+                result.warnings.push({
+                    type: 'warning',
+                    nodeId: node.id,
+                    nodeName: node.name,
+                    message: 'Node is not connected to any other nodes'
+                });
+            }
+        }
+    }
+    validateTriggerReachability(workflow, result) {
+        const adjacency = new Map();
+        for (const [sourceName, outputs] of Object.entries(workflow.connections)) {
+            if (!adjacency.has(sourceName))
+                adjacency.set(sourceName, new Set());
+            for (const outputConns of Object.values(outputs)) {
+                if (Array.isArray(outputConns)) {
+                    for (const conns of outputConns) {
+                        if (!conns)
+                            continue;
+                        for (const conn of conns) {
+                            if (conn) {
+                                adjacency.get(sourceName).add(conn.node);
+                                if (!adjacency.has(conn.node))
+                                    adjacency.set(conn.node, new Set());
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        const triggerNodes = [];
+        for (const node of workflow.nodes) {
+            if ((0, node_type_utils_1.isTriggerNode)(node.type) && !node.disabled) {
+                triggerNodes.push(node.name);
+            }
+        }
+        if (triggerNodes.length === 0) {
+            this.flagOrphanedNodes(workflow, result);
+            return;
+        }
+        const reachable = new Set();
+        const queue = [...triggerNodes];
+        for (const t of triggerNodes)
+            reachable.add(t);
+        while (queue.length > 0) {
+            const current = queue.shift();
+            const neighbors = adjacency.get(current);
+            if (neighbors) {
+                for (const neighbor of neighbors) {
+                    if (!reachable.has(neighbor)) {
+                        reachable.add(neighbor);
+                        queue.push(neighbor);
+                    }
+                }
+            }
+        }
+        for (const node of workflow.nodes) {
+            if (node.disabled || (0, node_classification_1.isNonExecutableNode)(node.type))
+                continue;
+            if ((0, node_type_utils_1.isTriggerNode)(node.type))
+                continue;
+            if (!reachable.has(node.name)) {
+                result.warnings.push({
+                    type: 'warning',
+                    nodeId: node.id,
+                    nodeName: node.name,
+                    message: 'Node is not reachable from any trigger node'
+                });
+            }
+        }
+    }
     hasCycle(workflow) {
         const visited = new Set();
         const recursionStack = new Set();
@@ -657,23 +919,13 @@ class WorkflowValidator {
             const connections = workflow.connections[nodeName];
             if (connections) {
                 const allTargets = [];
-                if (connections.main) {
-                    connections.main.flat().forEach(conn => {
-                        if (conn)
-                            allTargets.push(conn.node);
-                    });
-                }
-                if (connections.error) {
-                    connections.error.flat().forEach(conn => {
-                        if (conn)
-                            allTargets.push(conn.node);
-                    });
-                }
-                if (connections.ai_tool) {
-                    connections.ai_tool.flat().forEach(conn => {
-                        if (conn)
-                            allTargets.push(conn.node);
-                    });
+                for (const outputConns of Object.values(connections)) {
+                    if (Array.isArray(outputConns)) {
+                        outputConns.flat().forEach(conn => {
+                            if (conn)
+                                allTargets.push(conn.node);
+                        });
+                    }
                 }
                 const currentNodeType = nodeTypeMap.get(nodeName);
                 const isLoopNode = loopNodeTypes.includes(currentNodeType || '');

dist/telemetry/batch-processor.d.ts

@@ -12,6 +12,8 @@ export declare class TelemetryBatchProcessor {
     private flushTimes;
     private deadLetterQueue;
     private readonly maxDeadLetterSize;
+    private eventListeners;
+    private started;
     constructor(supabase: SupabaseClient | null, isEnabled: () => boolean);
     start(): void;
     stop(): void;

dist/telemetry/batch-processor.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"batch-processor.d.ts","sourceRoot":"","sources":["../../src/telemetry/batch-processor.ts"],"names":[],"mappings":"AAKA,OAAO,EAAE,cAAc,EAAE,MAAM,uBAAuB,CAAC;AACvD,OAAO,EAAE,cAAc,EAAE,iBAAiB,EAAE,sBAAsB,EAAoB,gBAAgB,EAAE,MAAM,mBAAmB,CAAC;AAoClI,qBAAa,uBAAuB;IA2BhC,OAAO,CAAC,QAAQ;IAChB,OAAO,CAAC,SAAS;IA3BnB,OAAO,CAAC,UAAU,CAAC,CAAiB;IACpC,OAAO,CAAC,gBAAgB,CAAkB;IAC1C,OAAO,CAAC,mBAAmB,CAAkB;IAC7C,OAAO,CAAC,mBAAmB,CAAkB;IAC7C,OAAO,CAAC,cAAc,CAA0B;IAChD,OAAO,CAAC,OAAO,CAQb;IACF,OAAO,CAAC,UAAU,CAAgB;IAClC,OAAO,CAAC,eAAe,CAAuE;IAC9F,OAAO,CAAC,QAAQ,CAAC,iBAAiB,CAAO;IAEzC,OAAO,CAAC,cAAc,CAIf;IACP,OAAO,CAAC,OAAO,CAAkB;gBAGvB,QAAQ,EAAE,cAAc,GAAG,IAAI,EAC/B,SAAS,EAAE,MAAM,OAAO;IAQlC,KAAK,IAAI,IAAI;IA0Cb,IAAI,IAAI,IAAI;IAyBN,KAAK,CAAC,MAAM,CAAC,EAAE,cAAc,EAAE,EAAE,SAAS,CAAC,EAAE,iBAAiB,EAAE,EAAE,SAAS,CAAC,EAAE,sBAAsB,EAAE,GAAG,OAAO,CAAC,IAAI,CAAC;YAgD9G,WAAW;YAmDX,cAAc;YAuDd,cAAc;YAiEd,gBAAgB;IAgD9B,OAAO,CAAC,aAAa;IAarB,OAAO,CAAC,oBAAoB;IAiB5B,OAAO,CAAC,oBAAoB;YAmBd,sBAAsB;IAgCpC,OAAO,CAAC,eAAe;IAiBvB,UAAU,IAAI,gBAAgB,GAAG;QAAE,mBAAmB,EAAE,GAAG,CAAC;QAAC,mBAAmB,EAAE,MAAM,CAAA;KAAE;IAW1F,YAAY,IAAI,IAAI;CAarB"}

dist/telemetry/batch-processor.js

@@ -33,26 +33,36 @@ class TelemetryBatchProcessor {
         this.flushTimes = [];
         this.deadLetterQueue = [];
         this.maxDeadLetterSize = 100;
+        this.eventListeners = {};
+        this.started = false;
         this.circuitBreaker = new telemetry_error_1.TelemetryCircuitBreaker();
     }
     start() {
         if (!this.isEnabled() || !this.supabase)
             return;
+        if (this.started) {
+            logger_1.logger.debug('Telemetry batch processor already started, skipping');
+            return;
+        }
         this.flushTimer = setInterval(() => {
             this.flush();
         }, telemetry_types_1.TELEMETRY_CONFIG.BATCH_FLUSH_INTERVAL);
         if (typeof this.flushTimer === 'object' && 'unref' in this.flushTimer) {
             this.flushTimer.unref();
         }
-        process.on('beforeExit', () => this.flush());
-        process.on('SIGINT', () => {
+        this.eventListeners.beforeExit = () => this.flush();
+        this.eventListeners.sigint = () => {
             this.flush();
             process.exit(0);
-        });
-        process.on('SIGTERM', () => {
+        };
+        this.eventListeners.sigterm = () => {
             this.flush();
             process.exit(0);
-        });
+        };
+        process.on('beforeExit', this.eventListeners.beforeExit);
+        process.on('SIGINT', this.eventListeners.sigint);
+        process.on('SIGTERM', this.eventListeners.sigterm);
+        this.started = true;
         logger_1.logger.debug('Telemetry batch processor started');
     }
     stop() {
@@ -60,6 +70,17 @@ class TelemetryBatchProcessor {
             clearInterval(this.flushTimer);
             this.flushTimer = undefined;
         }
+        if (this.eventListeners.beforeExit) {
+            process.removeListener('beforeExit', this.eventListeners.beforeExit);
+        }
+        if (this.eventListeners.sigint) {
+            process.removeListener('SIGINT', this.eventListeners.sigint);
+        }
+        if (this.eventListeners.sigterm) {
+            process.removeListener('SIGTERM', this.eventListeners.sigterm);
+        }
+        this.eventListeners = {};
+        this.started = false;
         logger_1.logger.debug('Telemetry batch processor stopped');
     }
     async flush(events, workflows, mutations) {

dist/types/index.d.ts

@@ -30,6 +30,11 @@ export interface ToolDefinition {
         additionalProperties?: boolean | Record<string, any>;
     };
     annotations?: ToolAnnotations;
+    _meta?: {
+        ui?: {
+            resourceUri?: string;
+        };
+    };
 }
 export interface ResourceDefinition {
     uri: string;

dist/types/index.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../src/types/index.ts"],"names":[],"mappings":"AACA,cAAc,cAAc,CAAC;AAC7B,cAAc,mBAAmB,CAAC;AAClC,cAAc,oBAAoB,CAAC;AACnC,cAAc,iBAAiB,CAAC;AAEhC,MAAM,WAAW,eAAe;IAC9B,IAAI,EAAE,MAAM,CAAC;IACb,IAAI,EAAE,MAAM,CAAC;IACb,SAAS,CAAC,EAAE,MAAM,CAAC;CACpB;AAMD,MAAM,WAAW,eAAe;IAE9B,KAAK,CAAC,EAAE,MAAM,CAAC;IAEf,YAAY,CAAC,EAAE,OAAO,CAAC;IAEvB,eAAe,CAAC,EAAE,OAAO,CAAC;IAE1B,cAAc,CAAC,EAAE,OAAO,CAAC;IAEzB,aAAa,CAAC,EAAE,OAAO,CAAC;CACzB;AAED,MAAM,WAAW,cAAc;IAC7B,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,EAAE,MAAM,CAAC;IACpB,WAAW,EAAE;QACX,IAAI,EAAE,MAAM,CAAC;QACb,UAAU,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAChC,QAAQ,CAAC,EAAE,MAAM,EAAE,CAAC;QACpB,oBAAoB,CAAC,EAAE,OAAO,GAAG,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;KACtD,CAAC;IACF,YAAY,CAAC,EAAE;QACb,IAAI,EAAE,MAAM,CAAC;QACb,UAAU,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAChC,QAAQ,CAAC,EAAE,MAAM,EAAE,CAAC;QACpB,oBAAoB,CAAC,EAAE,OAAO,GAAG,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;KACtD,CAAC;IAEF,WAAW,CAAC,EAAE,eAAe,CAAC;CAC/B;AAED,MAAM,WAAW,kBAAkB;IACjC,GAAG,EAAE,MAAM,CAAC;IACZ,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,CAAC,EAAE,MAAM,CAAC;IACrB,QAAQ,CAAC,EAAE,MAAM,CAAC;CACnB;AAED,MAAM,WAAW,gBAAgB;IAC/B,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,CAAC,EAAE,MAAM,CAAC;IACrB,SAAS,CAAC,EAAE,KAAK,CAAC;QAChB,IAAI,EAAE,MAAM,CAAC;QACb,WAAW,CAAC,EAAE,MAAM,CAAC;QACrB,QAAQ,CAAC,EAAE,OAAO,CAAC;KACpB,CAAC,CAAC;CACJ"}
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../src/types/index.ts"],"names":[],"mappings":"AACA,cAAc,cAAc,CAAC;AAC7B,cAAc,mBAAmB,CAAC;AAClC,cAAc,oBAAoB,CAAC;AACnC,cAAc,iBAAiB,CAAC;AAEhC,MAAM,WAAW,eAAe;IAC9B,IAAI,EAAE,MAAM,CAAC;IACb,IAAI,EAAE,MAAM,CAAC;IACb,SAAS,CAAC,EAAE,MAAM,CAAC;CACpB;AAMD,MAAM,WAAW,eAAe;IAE9B,KAAK,CAAC,EAAE,MAAM,CAAC;IAEf,YAAY,CAAC,EAAE,OAAO,CAAC;IAEvB,eAAe,CAAC,EAAE,OAAO,CAAC;IAE1B,cAAc,CAAC,EAAE,OAAO,CAAC;IAEzB,aAAa,CAAC,EAAE,OAAO,CAAC;CACzB;AAED,MAAM,WAAW,cAAc;IAC7B,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,EAAE,MAAM,CAAC;IACpB,WAAW,EAAE;QACX,IAAI,EAAE,MAAM,CAAC;QACb,UAAU,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAChC,QAAQ,CAAC,EAAE,MAAM,EAAE,CAAC;QACpB,oBAAoB,CAAC,EAAE,OAAO,GAAG,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;KACtD,CAAC;IACF,YAAY,CAAC,EAAE;QACb,IAAI,EAAE,MAAM,CAAC;QACb,UAAU,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;QAChC,QAAQ,CAAC,EAAE,MAAM,EAAE,CAAC;QACpB,oBAAoB,CAAC,EAAE,OAAO,GAAG,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;KACtD,CAAC;IAEF,WAAW,CAAC,EAAE,eAAe,CAAC;IAC9B,KAAK,CAAC,EAAE;QACN,EAAE,CAAC,EAAE;YACH,WAAW,CAAC,EAAE,MAAM,CAAC;SACtB,CAAC;KACH,CAAC;CACH;AAED,MAAM,WAAW,kBAAkB;IACjC,GAAG,EAAE,MAAM,CAAC;IACZ,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,CAAC,EAAE,MAAM,CAAC;IACrB,QAAQ,CAAC,EAAE,MAAM,CAAC;CACnB;AAED,MAAM,WAAW,gBAAgB;IAC/B,IAAI,EAAE,MAAM,CAAC;IACb,WAAW,CAAC,EAAE,MAAM,CAAC;IACrB,SAAS,CAAC,EAAE,KAAK,CAAC;QAChB,IAAI,EAAE,MAAM,CAAC;QACb,WAAW,CAAC,EAAE,MAAM,CAAC;QACrB,QAAQ,CAAC,EAAE,OAAO,CAAC;KACpB,CAAC,CAAC;CACJ"}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.33.0",
+  "version": "2.37.2",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -16,6 +16,8 @@
   },
   "scripts": {
     "build": "tsc -p tsconfig.build.json",
+    "build:ui": "cd ui-apps && npm install && npm run build",
+    "build:all": "npm run build:ui && npm run build",
     "rebuild": "node dist/scripts/rebuild.js",
     "rebuild:optimized": "node dist/scripts/rebuild-optimized.js",
     "validate": "node dist/scripts/validate.js",
@@ -123,6 +125,7 @@
   "homepage": "https://github.com/czlonkowski/n8n-mcp#readme",
   "files": [
     "dist/**/*",
+    "ui-apps/dist/**/*",
     "data/nodes.db",
     ".env.example",
     "README.md",
@@ -149,17 +152,17 @@
     "vitest": "^3.2.4"
   },
   "dependencies": {
-    "@modelcontextprotocol/sdk": "1.20.1",
-    "@n8n/n8n-nodes-langchain": "^2.2.2",
+    "@modelcontextprotocol/sdk": "^1.27.1",
+    "@n8n/n8n-nodes-langchain": "^2.11.2",
     "@supabase/supabase-js": "^2.57.4",
     "dotenv": "^16.5.0",
     "express": "^5.1.0",
     "express-rate-limit": "^7.1.5",
     "form-data": "^4.0.5",
     "lru-cache": "^11.2.1",
-    "n8n": "^2.2.3",
-    "n8n-core": "^2.2.2",
-    "n8n-workflow": "^2.2.2",
+    "n8n": "^2.11.4",
+    "n8n-core": "^2.11.1",
+    "n8n-workflow": "^2.11.1",
     "openai": "^4.77.0",
     "sql.js": "^1.13.0",
     "tslib": "^2.6.2",
@@ -172,6 +175,7 @@
     "better-sqlite3": "^11.10.0"
   },
   "overrides": {
-    "pyodide": "0.26.4"
+    "pyodide": "0.26.4",
+    "isolated-vm": "npm:empty-npm-package@1.0.0"
   }
 }

package.runtime.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp-runtime",
-  "version": "2.29.5",
+  "version": "2.33.2",
   "description": "n8n MCP Server Runtime Dependencies Only",
   "private": true,
   "dependencies": {

src/community/documentation-generator.ts

@@ -57,12 +57,14 @@ export interface DocumentationGeneratorConfig {
   timeout?: number;
   /** Max tokens for response (default: 2000) */
   maxTokens?: number;
+  /** Temperature for generation (default: 0.3, set to undefined to omit) */
+  temperature?: number;
 }
 
 /**
  * Default configuration
  */
-const DEFAULT_CONFIG: Required<Omit<DocumentationGeneratorConfig, 'baseUrl'>> = {
+const DEFAULT_CONFIG: Required<Omit<DocumentationGeneratorConfig, 'baseUrl' | 'temperature'>> = {
   model: 'qwen3-4b-thinking-2507',
   apiKey: 'not-needed',
   timeout: 60000,
@@ -78,6 +80,7 @@ export class DocumentationGenerator {
   private model: string;
   private maxTokens: number;
   private timeout: number;
+  private temperature?: number;
 
   constructor(config: DocumentationGeneratorConfig) {
     const fullConfig = { ...DEFAULT_CONFIG, ...config };
@@ -90,6 +93,7 @@ export class DocumentationGenerator {
     this.model = fullConfig.model;
     this.maxTokens = fullConfig.maxTokens;
     this.timeout = fullConfig.timeout;
+    this.temperature = fullConfig.temperature;
   }
 
   /**
@@ -101,8 +105,8 @@ export class DocumentationGenerator {
 
       const completion = await this.client.chat.completions.create({
         model: this.model,
-        max_tokens: this.maxTokens,
-        temperature: 0.3, // Lower temperature for more consistent output
+        max_completion_tokens: this.maxTokens,
+        ...(this.temperature !== undefined ? { temperature: this.temperature } : {}),
         messages: [
           {
             role: 'system',
@@ -321,7 +325,7 @@ Guidelines:
     try {
       const completion = await this.client.chat.completions.create({
         model: this.model,
-        max_tokens: 10,
+        max_completion_tokens: 200,
         messages: [
           {
             role: 'user',
@@ -353,10 +357,15 @@ export function createDocumentationGenerator(): DocumentationGenerator {
   const baseUrl = process.env.N8N_MCP_LLM_BASE_URL || 'http://localhost:1234/v1';
   const model = process.env.N8N_MCP_LLM_MODEL || 'qwen3-4b-thinking-2507';
   const timeout = parseInt(process.env.N8N_MCP_LLM_TIMEOUT || '60000', 10);
+  const apiKey = process.env.N8N_MCP_LLM_API_KEY || process.env.OPENAI_API_KEY;
+  // Only set temperature for local LLM servers; cloud APIs like OpenAI may not support custom values
+  const isLocalServer = !baseUrl.includes('openai.com') && !baseUrl.includes('anthropic.com');
 
   return new DocumentationGenerator({
     baseUrl,
     model,
     timeout,
+    ...(apiKey ? { apiKey } : {}),
+    ...(isLocalServer ? { temperature: 0.3 } : {}),
   });
 }

src/constants/type-structures.ts

@@ -5,7 +5,7 @@
  * These structures define the expected data format, JavaScript type,
  * validation rules, and examples for each property type.
  *
- * Based on n8n-workflow v1.120.3 NodePropertyTypes
+ * Based on n8n-workflow v2.4.2 NodePropertyTypes
  *
  * @module constants/type-structures
  * @since 2.23.0
@@ -15,7 +15,7 @@ import type { NodePropertyTypes } from 'n8n-workflow';
 import type { TypeStructure } from '../types/type-structures';
 
 /**
- * Complete type structure definitions for all 22 NodePropertyTypes
+ * Complete type structure definitions for all 23 NodePropertyTypes
  *
  * Each entry defines:
  * - type: Category (primitive/object/collection/special)
@@ -620,6 +620,23 @@ export const TYPE_STRUCTURES: Record<NodePropertyTypes, TypeStructure> = {
 			'One-time import feature',
 		],
 	},
+
+	icon: {
+		type: 'primitive',
+		jsType: 'string',
+		description: 'Icon identifier for visual representation',
+		example: 'fa:envelope',
+		examples: ['fa:envelope', 'fa:user', 'fa:cog', 'file:slack.svg'],
+		validation: {
+			allowEmpty: false,
+			allowExpressions: false,
+		},
+		notes: [
+			'References icon by name or file path',
+			'Supports Font Awesome icons (fa:) and file paths (file:)',
+			'Used for visual customization in UI',
+		],
+	},
 };
 
 /**

src/database/database-adapter.ts

@@ -419,12 +419,36 @@ class BetterSQLiteStatement implements PreparedStatement {
 
 /**
  * Statement wrapper for sql.js
+ *
+ * IMPORTANT: sql.js requires explicit memory management via Statement.free().
+ * This wrapper automatically frees statement memory after each operation
+ * to prevent memory leaks during sustained traffic.
+ *
+ * See: https://sql.js.org/documentation/Statement.html
+ * "After calling db.prepare() you must manually free the assigned memory
+ *  by calling Statement.free()."
  */
 class SQLJSStatement implements PreparedStatement {
   private boundParams: any = null;
-  
+  private freed: boolean = false;
+
   constructor(private stmt: any, private onModify: () => void) {}
-  
+
+  /**
+   * Free the underlying sql.js statement memory.
+   * Safe to call multiple times - subsequent calls are no-ops.
+   */
+  private freeStatement(): void {
+    if (!this.freed && this.stmt) {
+      try {
+        this.stmt.free();
+        this.freed = true;
+      } catch (e) {
+        // Statement may already be freed or invalid - ignore
+      }
+    }
+  }
+
   run(...params: any[]): RunResult {
     try {
       if (params.length > 0) {
@@ -433,10 +457,10 @@ class SQLJSStatement implements PreparedStatement {
           this.stmt.bind(this.boundParams);
         }
       }
-      
+
       this.stmt.run();
       this.onModify();
-      
+
       // sql.js doesn't provide changes/lastInsertRowid easily
       return {
         changes: 1, // Assume success means 1 change
@@ -445,9 +469,12 @@ class SQLJSStatement implements PreparedStatement {
     } catch (error) {
       this.stmt.reset();
       throw error;
+    } finally {
+      // Free statement memory after write operation completes
+      this.freeStatement();
     }
   }
-  
+
   get(...params: any[]): any {
     try {
       if (params.length > 0) {
@@ -456,21 +483,24 @@ class SQLJSStatement implements PreparedStatement {
           this.stmt.bind(this.boundParams);
         }
       }
-      
+
       if (this.stmt.step()) {
         const result = this.stmt.getAsObject();
         this.stmt.reset();
         return this.convertIntegerColumns(result);
       }
-      
+
       this.stmt.reset();
       return undefined;
     } catch (error) {
       this.stmt.reset();
       throw error;
+    } finally {
+      // Free statement memory after read operation completes
+      this.freeStatement();
     }
   }
-  
+
   all(...params: any[]): any[] {
     try {
       if (params.length > 0) {
@@ -479,17 +509,20 @@ class SQLJSStatement implements PreparedStatement {
           this.stmt.bind(this.boundParams);
         }
       }
-      
+
       const results: any[] = [];
       while (this.stmt.step()) {
         results.push(this.convertIntegerColumns(this.stmt.getAsObject()));
       }
-      
+
       this.stmt.reset();
       return results;
     } catch (error) {
       this.stmt.reset();
       throw error;
+    } finally {
+      // Free statement memory after read operation completes
+      this.freeStatement();
     }
   }
   

src/database/shared-database.ts

@@ -0,0 +1,203 @@
+/**
+ * Shared Database Manager - Singleton for cross-session database connection
+ *
+ * This module implements a singleton pattern to share a single database connection
+ * across all MCP server sessions. This prevents memory leaks caused by each session
+ * creating its own database connection (~900MB per session).
+ *
+ * Memory impact: Reduces per-session memory from ~900MB to near-zero by sharing
+ * a single ~68MB database connection across all sessions.
+ *
+ * Issue: https://github.com/czlonkowski/n8n-mcp/issues/XXX
+ */
+
+import path from 'path';
+import { DatabaseAdapter, createDatabaseAdapter } from './database-adapter';
+import { NodeRepository } from './node-repository';
+import { TemplateService } from '../templates/template-service';
+import { EnhancedConfigValidator } from '../services/enhanced-config-validator';
+import { logger } from '../utils/logger';
+
+/**
+ * Shared database state - holds the singleton connection and services
+ */
+export interface SharedDatabaseState {
+  db: DatabaseAdapter;
+  repository: NodeRepository;
+  templateService: TemplateService;
+  dbPath: string;
+  refCount: number;
+  initialized: boolean;
+}
+
+// Module-level singleton state
+let sharedState: SharedDatabaseState | null = null;
+let initializationPromise: Promise<SharedDatabaseState> | null = null;
+
+/**
+ * Get or create the shared database connection
+ *
+ * Thread-safe initialization using a promise lock pattern.
+ * Multiple concurrent calls will wait for the same initialization.
+ *
+ * @param dbPath - Path to the SQLite database file
+ * @returns Shared database state with connection and services
+ */
+export async function getSharedDatabase(dbPath: string): Promise<SharedDatabaseState> {
+  // Normalize to a canonical absolute path so that callers using different
+  // relative or join-based paths (e.g. "./data/nodes.db" vs an absolute path)
+  // resolve to the same string and do not trigger a false "different path" error.
+  const normalizedPath = dbPath === ':memory:' ? dbPath : path.resolve(dbPath);
+
+  // If already initialized with the same path, increment ref count and return
+  if (sharedState && sharedState.initialized && sharedState.dbPath === normalizedPath) {
+    sharedState.refCount++;
+    logger.debug('Reusing shared database connection', {
+      refCount: sharedState.refCount,
+      dbPath: normalizedPath
+    });
+    return sharedState;
+  }
+
+  // If already initialized with a DIFFERENT path, this is a configuration error
+  if (sharedState && sharedState.initialized && sharedState.dbPath !== normalizedPath) {
+    logger.error('Attempted to initialize shared database with different path', {
+      existingPath: sharedState.dbPath,
+      requestedPath: normalizedPath
+    });
+    throw new Error(`Shared database already initialized with different path: ${sharedState.dbPath}`);
+  }
+
+  // If initialization is in progress, wait for it
+  if (initializationPromise) {
+    try {
+      const state = await initializationPromise;
+      state.refCount++;
+      logger.debug('Reusing shared database (waited for init)', {
+        refCount: state.refCount,
+        dbPath: normalizedPath
+      });
+      return state;
+    } catch (error) {
+      // Initialization failed while we were waiting, clear promise and rethrow
+      initializationPromise = null;
+      throw error;
+    }
+  }
+
+  // Start new initialization
+  initializationPromise = initializeSharedDatabase(normalizedPath);
+
+  try {
+    const state = await initializationPromise;
+    // Clear the promise on success to allow future re-initialization after close
+    initializationPromise = null;
+    return state;
+  } catch (error) {
+    // Clear promise on failure to allow retry
+    initializationPromise = null;
+    throw error;
+  }
+}
+
+/**
+ * Initialize the shared database connection and services
+ */
+async function initializeSharedDatabase(dbPath: string): Promise<SharedDatabaseState> {
+  logger.info('Initializing shared database connection', { dbPath });
+
+  const db = await createDatabaseAdapter(dbPath);
+  const repository = new NodeRepository(db);
+  const templateService = new TemplateService(db);
+
+  // Initialize similarity services for enhanced validation
+  EnhancedConfigValidator.initializeSimilarityServices(repository);
+
+  sharedState = {
+    db,
+    repository,
+    templateService,
+    dbPath,
+    refCount: 1,
+    initialized: true
+  };
+
+  logger.info('Shared database initialized successfully', {
+    dbPath,
+    refCount: sharedState.refCount
+  });
+
+  return sharedState;
+}
+
+/**
+ * Release a reference to the shared database
+ *
+ * Decrements the reference count. Does NOT close the database
+ * as it's shared across all sessions for the lifetime of the process.
+ *
+ * @param state - The shared database state to release
+ */
+export function releaseSharedDatabase(state: SharedDatabaseState): void {
+  if (!state || !sharedState) {
+    return;
+  }
+
+  // Guard against double-release (refCount going negative)
+  if (sharedState.refCount <= 0) {
+    logger.warn('Attempted to release shared database with refCount already at or below 0', {
+      refCount: sharedState.refCount
+    });
+    return;
+  }
+
+  sharedState.refCount--;
+  logger.debug('Released shared database reference', {
+    refCount: sharedState.refCount
+  });
+
+  // Note: We intentionally do NOT close the database even when refCount hits 0
+  // The database should remain open for the lifetime of the process to handle
+  // new sessions. Only process shutdown should close it.
+}
+
+/**
+ * Force close the shared database (for graceful shutdown only)
+ *
+ * This should only be called during process shutdown, not during normal
+ * session cleanup. Closing the database would break other active sessions.
+ */
+export async function closeSharedDatabase(): Promise<void> {
+  if (!sharedState) {
+    return;
+  }
+
+  logger.info('Closing shared database connection', {
+    refCount: sharedState.refCount
+  });
+
+  try {
+    sharedState.db.close();
+  } catch (error) {
+    logger.warn('Error closing shared database', {
+      error: error instanceof Error ? error.message : String(error)
+    });
+  }
+
+  sharedState = null;
+  initializationPromise = null;
+}
+
+/**
+ * Check if shared database is initialized
+ */
+export function isSharedDatabaseInitialized(): boolean {
+  return sharedState !== null && sharedState.initialized;
+}
+
+/**
+ * Get current reference count (for debugging/monitoring)
+ */
+export function getSharedDatabaseRefCount(): number {
+  return sharedState?.refCount ?? 0;
+}

src/http-server-single-session.ts

@@ -26,6 +26,7 @@ import {
 } from './utils/protocol-version';
 import { InstanceContext, validateInstanceContext } from './types/instance-context';
 import { SessionState } from './types/session-state';
+import { closeSharedDatabase } from './database/shared-database';
 
 dotenv.config();
 
@@ -106,7 +107,12 @@ export class SingleSessionHTTPServer {
   private session: Session | null = null;  // Keep for SSE compatibility
   private consoleManager = new ConsoleManager();
   private expressServer: any;
-  private sessionTimeout = 30 * 60 * 1000; // 30 minutes
+  // Session timeout reduced from 30 minutes to 5 minutes for faster cleanup
+  // Configurable via SESSION_TIMEOUT_MINUTES environment variable
+  // This prevents memory buildup from stale sessions
+  private sessionTimeout = parseInt(
+    process.env.SESSION_TIMEOUT_MINUTES || '5', 10
+  ) * 60 * 1000;
   private authToken: string | null = null;
   private cleanupTimer: NodeJS.Timeout | null = null;
   
@@ -492,6 +498,29 @@ export class SingleSessionHTTPServer {
           // For initialize requests: always create new transport and server
           logger.info('handleRequest: Creating new transport for initialize request');
 
+          // EAGER CLEANUP: Remove existing sessions for the same instance
+          // This prevents memory buildup when clients reconnect without proper cleanup
+          if (instanceContext?.instanceId) {
+            const sessionsToRemove: string[] = [];
+            for (const [existingSessionId, context] of Object.entries(this.sessionContexts)) {
+              if (context?.instanceId === instanceContext.instanceId) {
+                sessionsToRemove.push(existingSessionId);
+              }
+            }
+            for (const oldSessionId of sessionsToRemove) {
+              // Double-check session still exists (may have been cleaned by concurrent request)
+              if (!this.transports[oldSessionId]) {
+                continue;
+              }
+              logger.info('Cleaning up previous session for instance', {
+                instanceId: instanceContext.instanceId,
+                oldSession: oldSessionId,
+                reason: 'instance_reconnect'
+              });
+              await this.removeSession(oldSessionId, 'instance_reconnect');
+            }
+          }
+
           // Generate session ID based on multi-tenant configuration
           let sessionIdToUse: string;
 
@@ -677,11 +706,25 @@ export class SingleSessionHTTPServer {
   private async resetSessionSSE(res: express.Response): Promise<void> {
     // Clean up old session if exists
     if (this.session) {
+      const sessionId = this.session.sessionId;
+      logger.info('Closing previous session for SSE', { sessionId });
+
+      // Close server first to free resources (database, cache timer, etc.)
+      // This mirrors the cleanup pattern in removeSession() (issue #542)
+      // Handle server close errors separately so transport close still runs
+      if (this.session.server && typeof this.session.server.close === 'function') {
+        try {
+          await this.session.server.close();
+        } catch (serverError) {
+          logger.warn('Error closing server for SSE session', { sessionId, error: serverError });
+        }
+      }
+
+      // Close transport last - always attempt even if server.close() failed
       try {
-        logger.info('Closing previous session for SSE', { sessionId: this.session.sessionId });
         await this.session.transport.close();
-      } catch (error) {
-        logger.warn('Error closing previous session:', error);
+      } catch (transportError) {
+        logger.warn('Error closing transport for SSE session', { sessionId, error: transportError });
       }
     }
     
@@ -1408,7 +1451,16 @@ export class SingleSessionHTTPServer {
         });
       });
     }
-    
+
+    // Close the shared database connection (only during process shutdown)
+    // This must happen after all sessions are closed
+    try {
+      await closeSharedDatabase();
+      logger.info('Shared database closed');
+    } catch (error) {
+      logger.warn('Error closing shared database:', error);
+    }
+
     logger.info('Single-Session HTTP server shutdown completed');
   }
   

src/index.ts

@@ -22,6 +22,10 @@ export type {
   SessionState
 } from './types/session-state';
 
+// UI module exports
+export type { UIAppConfig, UIMetadata } from './mcp/ui/types';
+export { UI_APP_CONFIGS } from './mcp/ui/app-configs';
+
 // Re-export MCP SDK types for convenience
 export type {
   Tool,

src/loaders/node-loader.ts

@@ -31,24 +31,44 @@ export class N8nNodeLoader {
     return results;
   }
 
+  /**
+   * Resolve the absolute directory of an installed package.
+   * Uses require.resolve on package.json (always exported) and strips the filename.
+   */
+  private resolvePackageDir(packagePath: string): string {
+    const pkgJsonPath = require.resolve(`${packagePath}/package.json`);
+    return path.dirname(pkgJsonPath);
+  }
+
+  /**
+   * Load a node module by absolute file path, bypassing package.json "exports".
+   * Some packages (e.g. @n8n/n8n-nodes-langchain >=2.9) restrict exports but
+   * still list node files in the n8n.nodes array — we need direct filesystem access.
+   */
+  private loadNodeModule(absolutePath: string): any {
+    return require(absolutePath);
+  }
+
   private async loadPackageNodes(packageName: string, packagePath: string, packageJson: any): Promise<LoadedNode[]> {
     const n8nConfig = packageJson.n8n || {};
     const nodes: LoadedNode[] = [];
-    
+    const packageDir = this.resolvePackageDir(packagePath);
+
     // Check if nodes is an array or object
     const nodesList = n8nConfig.nodes || [];
-    
+
     if (Array.isArray(nodesList)) {
       // Handle array format (n8n-nodes-base uses this)
       for (const nodePath of nodesList) {
         try {
-          const fullPath = require.resolve(`${packagePath}/${nodePath}`);
-          const nodeModule = require(fullPath);
-          
+          // Resolve absolute path directly to bypass package exports restrictions
+          const fullPath = path.join(packageDir, nodePath);
+          const nodeModule = this.loadNodeModule(fullPath);
+
           // Extract node name from path (e.g., "dist/nodes/Slack/Slack.node.js" -> "Slack")
           const nodeNameMatch = nodePath.match(/\/([^\/]+)\.node\.(js|ts)$/);
           const nodeName = nodeNameMatch ? nodeNameMatch[1] : path.basename(nodePath, '.node.js');
-          
+
           // Handle default export and various export patterns
           const NodeClass = nodeModule.default || nodeModule[nodeName] || Object.values(nodeModule)[0];
           if (NodeClass) {
@@ -65,9 +85,9 @@ export class N8nNodeLoader {
       // Handle object format (for other packages)
       for (const [nodeName, nodePath] of Object.entries(nodesList)) {
         try {
-          const fullPath = require.resolve(`${packagePath}/${nodePath as string}`);
-          const nodeModule = require(fullPath);
-          
+          const fullPath = path.join(packageDir, nodePath as string);
+          const nodeModule = this.loadNodeModule(fullPath);
+
           // Handle default export and various export patterns
           const NodeClass = nodeModule.default || nodeModule[nodeName] || Object.values(nodeModule)[0];
           if (NodeClass) {
@@ -81,7 +101,7 @@ export class N8nNodeLoader {
         }
       }
     }
-    
+
     return nodes;
   }
 }

src/mcp/handlers-n8n-manager.ts

@@ -424,7 +424,13 @@ const autofixWorkflowSchema = z.object({
     'node-type-correction',
     'webhook-missing-path',
     'typeversion-upgrade',
-    'version-migration'
+    'version-migration',
+    'tool-variant-correction',
+    'connection-numeric-keys',
+    'connection-invalid-type',
+    'connection-id-to-name',
+    'connection-duplicate-removal',
+    'connection-input-index'
   ])).optional(),
   confidenceThreshold: z.enum(['high', 'medium', 'low']).optional().default('medium'),
   maxFixes: z.number().optional().default(50)
@@ -513,6 +519,17 @@ export async function handleCreateWorkflow(args: unknown, context?: InstanceCont
     // Create workflow (n8n API expects node types in FULL form)
     const workflow = await client.createWorkflow(input);
 
+    // Defensive check: ensure the API returned a valid workflow with an ID
+    if (!workflow || !workflow.id) {
+      return {
+        success: false,
+        error: 'Workflow creation failed: n8n API returned an empty or invalid response. Verify your N8N_API_URL points to the correct /api/v1 endpoint and that the n8n instance supports workflow creation.',
+        details: {
+          response: workflow ? { keys: Object.keys(workflow) } : null
+        }
+      };
+    }
+
     // Track successful workflow creation
     telemetry.trackWorkflowCreation(workflow, true);
 

src/mcp/handlers-workflow-diff.ts

@@ -5,7 +5,7 @@
 
 import { z } from 'zod';
 import { McpToolResponse } from '../types/n8n-api';
-import { WorkflowDiffRequest, WorkflowDiffOperation } from '../types/workflow-diff';
+import { WorkflowDiffRequest, WorkflowDiffOperation, WorkflowDiffValidationError } from '../types/workflow-diff';
 import { WorkflowDiffEngine } from '../services/workflow-diff-engine';
 import { getN8nApiClient } from './handlers-n8n-manager';
 import { N8nApiError, getUserFriendlyErrorMessage } from '../utils/n8n-errors';
@@ -48,8 +48,8 @@ const workflowDiffSchema = z.object({
     target: z.string().optional(),
     from: z.string().optional(),  // For rewireConnection
     to: z.string().optional(),    // For rewireConnection
-    sourceOutput: z.string().optional(),
-    targetInput: z.string().optional(),
+    sourceOutput: z.union([z.string(), z.number()]).transform(String).optional(),
+    targetInput: z.union([z.string(), z.number()]).transform(String).optional(),
     sourceIndex: z.number().optional(),
     targetIndex: z.number().optional(),
     // Smart parameters (Phase 1 UX improvement)
@@ -178,11 +178,12 @@ export async function handleUpdatePartialWorkflow(
         // Complete failure - return error
         return {
           success: false,
+          saved: false,
           error: 'Failed to apply diff operations',
+          operationsApplied: diffResult.operationsApplied,
           details: {
             errors: diffResult.errors,
             warnings: diffResult.warnings,
-            operationsApplied: diffResult.operationsApplied,
             applied: diffResult.applied,
             failed: diffResult.failed
           }
@@ -265,6 +266,7 @@ export async function handleUpdatePartialWorkflow(
         if (!skipValidation) {
           return {
             success: false,
+            saved: false,
             error: errorMessage,
             details: {
               errors: structureErrors,
@@ -273,7 +275,7 @@ export async function handleUpdatePartialWorkflow(
               applied: diffResult.applied,
               recoveryGuidance: recoverySteps,
               note: 'Operations were applied but created an invalid workflow structure. The workflow was NOT saved to n8n to prevent UI rendering errors.',
-              autoSanitizationNote: 'Auto-sanitization runs on all nodes during updates to fix operator structures and add missing metadata. However, it cannot fix all issues (e.g., broken connections, branch mismatches). Use the recovery guidance above to resolve remaining issues.'
+              autoSanitizationNote: 'Auto-sanitization runs on modified nodes during updates to fix operator structures and add missing metadata. However, it cannot fix all issues (e.g., broken connections, branch mismatches). Use the recovery guidance above to resolve remaining issues.'
             }
           };
         }
@@ -289,6 +291,63 @@ export async function handleUpdatePartialWorkflow(
     try {
       const updatedWorkflow = await client.updateWorkflow(input.id, diffResult.workflow!);
 
+      // Handle tag operations via dedicated API (#599)
+      let tagWarnings: string[] = [];
+      if (diffResult.tagsToAdd?.length || diffResult.tagsToRemove?.length) {
+        try {
+          // Get existing tags from the updated workflow
+          const existingTags: Array<{ id: string; name: string }> = Array.isArray(updatedWorkflow.tags)
+            ? updatedWorkflow.tags.map((t: any) => typeof t === 'object' ? { id: t.id, name: t.name } : { id: '', name: t })
+            : [];
+
+          // Resolve tag names to IDs
+          const allTags = await client.listTags();
+          const tagMap = new Map<string, string>();
+          for (const t of allTags.data) {
+            if (t.id) tagMap.set(t.name.toLowerCase(), t.id);
+          }
+
+          // Create any tags that don't exist yet
+          for (const tagName of (diffResult.tagsToAdd || [])) {
+            if (!tagMap.has(tagName.toLowerCase())) {
+              try {
+                const newTag = await client.createTag({ name: tagName });
+                if (newTag.id) tagMap.set(tagName.toLowerCase(), newTag.id);
+              } catch (createErr) {
+                tagWarnings.push(`Failed to create tag "${tagName}": ${createErr instanceof Error ? createErr.message : 'Unknown error'}`);
+              }
+            }
+          }
+
+          // Compute final tag set — resolve string-type tags via tagMap
+          const currentTagIds = new Set<string>();
+          for (const et of existingTags) {
+            if (et.id) {
+              currentTagIds.add(et.id);
+            } else {
+              const resolved = tagMap.get(et.name.toLowerCase());
+              if (resolved) currentTagIds.add(resolved);
+            }
+          }
+
+          for (const tagName of (diffResult.tagsToAdd || [])) {
+            const tagId = tagMap.get(tagName.toLowerCase());
+            if (tagId) currentTagIds.add(tagId);
+          }
+
+          for (const tagName of (diffResult.tagsToRemove || [])) {
+            const tagId = tagMap.get(tagName.toLowerCase());
+            if (tagId) currentTagIds.delete(tagId);
+          }
+
+          // Update workflow tags via dedicated API
+          await client.updateWorkflowTags(input.id, Array.from(currentTagIds));
+        } catch (tagError) {
+          tagWarnings.push(`Tag update failed: ${tagError instanceof Error ? tagError.message : 'Unknown error'}`);
+          logger.warn('Tag operations failed (non-blocking)', tagError);
+        }
+      }
+
       // Handle activation/deactivation if requested
       let finalWorkflow = updatedWorkflow;
       let activationMessage = '';
@@ -319,6 +378,7 @@ export async function handleUpdatePartialWorkflow(
           logger.error('Failed to activate workflow after update', activationError);
           return {
             success: false,
+            saved: true,
             error: 'Workflow updated successfully but activation failed',
             details: {
               workflowUpdated: true,
@@ -334,6 +394,7 @@ export async function handleUpdatePartialWorkflow(
           logger.error('Failed to deactivate workflow after update', deactivationError);
           return {
             success: false,
+            saved: true,
             error: 'Workflow updated successfully but deactivation failed',
             details: {
               workflowUpdated: true,
@@ -363,6 +424,7 @@ export async function handleUpdatePartialWorkflow(
 
       return {
         success: true,
+        saved: true,
         data: {
           id: finalWorkflow.id,
           name: finalWorkflow.name,
@@ -375,7 +437,7 @@ export async function handleUpdatePartialWorkflow(
           applied: diffResult.applied,
           failed: diffResult.failed,
           errors: diffResult.errors,
-          warnings: diffResult.warnings
+          warnings: mergeWarnings(diffResult.warnings, tagWarnings)
         }
       };
     } catch (error) {
@@ -413,7 +475,9 @@ export async function handleUpdatePartialWorkflow(
       return {
         success: false,
         error: 'Invalid input',
-        details: { errors: error.errors }
+        details: {
+          errors: error.errors.map(e => `${e.path.join('.')}: ${e.message}`)
+        }
       };
     }
 
@@ -425,6 +489,21 @@ export async function handleUpdatePartialWorkflow(
   }
 }
 
+/**
+ * Merge diff engine warnings with tag operation warnings into a single array.
+ * Returns undefined when there are no warnings to keep the response clean.
+ */
+function mergeWarnings(
+  diffWarnings: WorkflowDiffValidationError[] | undefined,
+  tagWarnings: string[]
+): WorkflowDiffValidationError[] | undefined {
+  const merged: WorkflowDiffValidationError[] = [
+    ...(diffWarnings || []),
+    ...tagWarnings.map(w => ({ operation: -1, message: w }))
+  ];
+  return merged.length > 0 ? merged : undefined;
+}
+
 /**
  * Infer intent from operations when not explicitly provided
  */

src/mcp/server.ts

@@ -1,19 +1,23 @@
 import { Server } from '@modelcontextprotocol/sdk/server/index.js';
 import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
-import { 
-  CallToolRequestSchema, 
+import {
+  CallToolRequestSchema,
   ListToolsRequestSchema,
   InitializeRequestSchema,
+  ListResourcesRequestSchema,
+  ReadResourceRequestSchema,
 } from '@modelcontextprotocol/sdk/types.js';
 import { existsSync, promises as fs } from 'fs';
 import path from 'path';
 import { n8nDocumentationToolsFinal } from './tools';
+import { UIAppRegistry } from './ui';
 import { n8nManagementTools } from './tools-n8n-manager';
 import { makeToolsN8nFriendly } from './tools-n8n-friendly';
 import { getWorkflowExampleString } from './workflow-examples';
 import { logger } from '../utils/logger';
 import { NodeRepository } from '../database/node-repository';
 import { DatabaseAdapter, createDatabaseAdapter } from '../database/database-adapter';
+import { getSharedDatabase, releaseSharedDatabase, SharedDatabaseState } from '../database/shared-database';
 import { PropertyFilter } from '../services/property-filter';
 import { TaskTemplates } from '../services/task-templates';
 import { ConfigValidator } from '../services/config-validator';
@@ -150,6 +154,9 @@ export class N8NDocumentationMCPServer {
   private previousToolTimestamp: number = Date.now();
   private earlyLogger: EarlyErrorLogger | null = null;
   private disabledToolsCache: Set<string> | null = null;
+  private useSharedDatabase: boolean = false;  // Track if using shared DB for cleanup
+  private sharedDbState: SharedDatabaseState | null = null;  // Reference to shared DB state for release
+  private isShutdown: boolean = false;  // Prevent double-shutdown
 
   constructor(instanceContext?: InstanceContext, earlyLogger?: EarlyErrorLogger) {
     this.instanceContext = instanceContext;
@@ -203,6 +210,13 @@ export class N8NDocumentationMCPServer {
       }
     });
 
+    // Attach a no-op catch handler to prevent Node.js from flagging this as an
+    // unhandled rejection in the interval between construction and the first
+    // await of this.initialized (via ensureInitialized). This does NOT suppress
+    // the error: the original this.initialized promise still rejects, and
+    // ensureInitialized() will re-throw it when awaited.
+    this.initialized.catch(() => {});
+
     logger.info('Initializing n8n Documentation MCP server');
     
     this.server = new Server(
@@ -231,10 +245,12 @@ export class N8NDocumentationMCPServer {
       {
         capabilities: {
           tools: {},
+          resources: {},
         },
       }
     );
 
+    UIAppRegistry.load();
     this.setupHandlers();
   }
 
@@ -245,18 +261,39 @@ export class N8NDocumentationMCPServer {
    * Order of cleanup:
    * 1. Close MCP server connection
    * 2. Destroy cache (clears entries AND stops cleanup timer)
-   * 3. Close database connection
+   * 3. Release shared database OR close dedicated connection
    * 4. Null out references to help GC
+   *
+   * IMPORTANT: For shared databases, we only release the reference (decrement refCount),
+   * NOT close the database. The database stays open for other sessions.
+   * For in-memory databases (tests), we close the dedicated connection.
    */
   async close(): Promise<void> {
+    // Wait for initialization to complete (or fail) before cleanup
+    // This prevents race conditions where close runs while init is in progress
+    try {
+      await this.initialized;
+    } catch (error) {
+      // Initialization failed - that's OK, we still need to clean up
+      logger.debug('Initialization had failed, proceeding with cleanup', {
+        error: error instanceof Error ? error.message : String(error)
+      });
+    }
+
     try {
       await this.server.close();
 
       // Use destroy() not clear() - also stops the cleanup timer
       this.cache.destroy();
 
-      // Close database connection before nullifying reference
-      if (this.db) {
+      // Handle database cleanup based on whether it's shared or dedicated
+      if (this.useSharedDatabase && this.sharedDbState) {
+        // Shared database: release reference, don't close
+        // The database stays open for other sessions
+        releaseSharedDatabase(this.sharedDbState);
+        logger.debug('Released shared database reference');
+      } else if (this.db) {
+        // Dedicated database (in-memory for tests): close it
         try {
           this.db.close();
         } catch (dbError) {
@@ -271,6 +308,7 @@ export class N8NDocumentationMCPServer {
       this.repository = null;
       this.templateService = null;
       this.earlyLogger = null;
+      this.sharedDbState = null;
     } catch (error) {
       // Log but don't throw - cleanup should be best-effort
       logger.warn('Error closing MCP server', { error: error instanceof Error ? error.message : String(error) });
@@ -286,23 +324,32 @@ export class N8NDocumentationMCPServer {
 
       logger.debug('Database initialization starting...', { dbPath });
 
-      this.db = await createDatabaseAdapter(dbPath);
-      logger.debug('Database adapter created');
-
-      // If using in-memory database for tests, initialize schema
+      // For in-memory databases (tests), create a dedicated connection
+      // For regular databases, use the shared connection to prevent memory leaks
       if (dbPath === ':memory:') {
+        this.db = await createDatabaseAdapter(dbPath);
+        logger.debug('Database adapter created (in-memory mode)');
         await this.initializeInMemorySchema();
         logger.debug('In-memory schema initialized');
+        this.repository = new NodeRepository(this.db);
+        this.templateService = new TemplateService(this.db);
+        // Initialize similarity services for enhanced validation
+        EnhancedConfigValidator.initializeSimilarityServices(this.repository);
+        this.useSharedDatabase = false;
+      } else {
+        // Use shared database connection to prevent ~900MB memory leak per session
+        // See: Memory leak fix - database was being duplicated per session
+        const sharedState = await getSharedDatabase(dbPath);
+        this.db = sharedState.db;
+        this.repository = sharedState.repository;
+        this.templateService = sharedState.templateService;
+        this.sharedDbState = sharedState;
+        this.useSharedDatabase = true;
+        logger.debug('Using shared database connection');
       }
 
-      this.repository = new NodeRepository(this.db);
       logger.debug('Node repository initialized');
-
-      this.templateService = new TemplateService(this.db);
       logger.debug('Template service initialized');
-
-      // Initialize similarity services for enhanced validation
-      EnhancedConfigValidator.initializeSimilarityServices(this.repository);
       logger.debug('Similarity services initialized');
 
       // Checkpoint: Database connected (v2.18.3)
@@ -528,6 +575,7 @@ export class N8NDocumentationMCPServer {
         protocolVersion: negotiationResult.version,
         capabilities: {
           tools: {},
+          resources: {},
         },
         serverInfo: {
           name: 'n8n-documentation-mcp',
@@ -610,6 +658,7 @@ export class N8NDocumentationMCPServer {
         });
       });
       
+      UIAppRegistry.injectToolMeta(tools);
       return { tools };
     });
 
@@ -645,9 +694,23 @@ export class N8NDocumentationMCPServer {
         };
       }
 
+      // Safeguard: if the entire args object arrives as a JSON string, parse it.
+      // Some MCP clients may serialize the arguments object itself.
+      let processedArgs: Record<string, any> | undefined = args;
+      if (typeof args === 'string') {
+        try {
+          const parsed = JSON.parse(args as unknown as string);
+          if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) {
+            processedArgs = parsed;
+            logger.warn(`Coerced stringified args object for tool "${name}"`);
+          }
+        } catch {
+          logger.warn(`Tool "${name}" received string args that are not valid JSON`);
+        }
+      }
+
       // Workaround for n8n's nested output bug
       // Check if args contains nested 'output' structure from n8n's memory corruption
-      let processedArgs = args;
       if (args && typeof args === 'object' && 'output' in args) {
         try {
           const possibleNestedData = args.output;
@@ -678,7 +741,13 @@ export class N8NDocumentationMCPServer {
           });
         }
       }
-      
+
+      // Workaround for Claude Desktop / Claude.ai MCP client bugs that
+      // serialize parameters with wrong types. Coerces ALL mismatched types
+      // (string↔object, string↔number, string↔boolean, etc.) using the
+      // tool's inputSchema as the source of truth.
+      processedArgs = this.coerceStringifiedJsonParams(name, processedArgs);
+
       try {
         logger.debug(`Executing tool: ${name}`, { args: processedArgs });
         const startTime = Date.now();
@@ -739,7 +808,7 @@ export class N8NDocumentationMCPServer {
         if (name.startsWith('validate_') && structuredContent !== null) {
           mcpResponse.structuredContent = structuredContent;
         }
-        
+
         return mcpResponse;
       } catch (error) {
         logger.error(`Error executing tool ${name}`, error);
@@ -766,7 +835,7 @@ export class N8NDocumentationMCPServer {
 
         // Provide more helpful error messages for common n8n issues
         let helpfulMessage = `Error executing tool ${name}: ${errorMessage}`;
-        
+
         if (errorMessage.includes('required') || errorMessage.includes('missing')) {
           helpfulMessage += '\n\nNote: This error often occurs when the AI agent sends incomplete or incorrectly formatted parameters. Please ensure all required fields are provided with the correct types.';
         } else if (errorMessage.includes('type') || errorMessage.includes('expected')) {
@@ -774,12 +843,20 @@ export class N8NDocumentationMCPServer {
         } else if (errorMessage.includes('Unknown category') || errorMessage.includes('not found')) {
           helpfulMessage += '\n\nNote: The requested resource or category was not found. Please check the available options.';
         }
-        
+
         // For n8n schema errors, add specific guidance
         if (name.startsWith('validate_') && (errorMessage.includes('config') || errorMessage.includes('nodeType'))) {
           helpfulMessage += '\n\nFor validation tools:\n- nodeType should be a string (e.g., "nodes-base.webhook")\n- config should be an object (e.g., {})';
         }
-        
+
+        // Include diagnostic info about received args to help debug client issues
+        try {
+          const argDiag = processedArgs && typeof processedArgs === 'object'
+            ? Object.entries(processedArgs).map(([k, v]) => `${k}: ${typeof v}`).join(', ')
+            : `args type: ${typeof processedArgs}`;
+          helpfulMessage += `\n\n[Diagnostic] Received arg types: {${argDiag}}`;
+        } catch { /* ignore diagnostic errors */ }
+
         return {
           content: [
             {
@@ -791,6 +868,46 @@ export class N8NDocumentationMCPServer {
         };
       }
     });
+
+    // Handle ListResources for UI apps
+    this.server.setRequestHandler(ListResourcesRequestSchema, async () => {
+      const apps = UIAppRegistry.getAllApps();
+      return {
+        resources: apps
+          .filter(app => app.html !== null)
+          .map(app => ({
+            uri: app.config.uri,
+            name: app.config.displayName,
+            description: app.config.description,
+            mimeType: app.config.mimeType,
+          })),
+      };
+    });
+
+    // Handle ReadResource for UI apps
+    this.server.setRequestHandler(ReadResourceRequestSchema, async (request) => {
+      const uri = request.params.uri;
+      // Parse ui://n8n-mcp/{id} pattern
+      const match = uri.match(/^ui:\/\/n8n-mcp\/(.+)$/);
+      if (!match) {
+        throw new Error(`Unknown resource URI: ${uri}`);
+      }
+
+      const app = UIAppRegistry.getAppById(match[1]);
+      if (!app || !app.html) {
+        throw new Error(`UI app not found or not built: ${match[1]}`);
+      }
+
+      return {
+        contents: [
+          {
+            uri: app.config.uri,
+            mimeType: app.config.mimeType,
+            text: app.html,
+          },
+        ],
+      };
+    });
   }
 
   /**
@@ -1043,6 +1160,109 @@ export class N8NDocumentationMCPServer {
     return true;
   }
 
+  /**
+   * Coerce mistyped parameters back to their expected types.
+   * Workaround for Claude Desktop / Claude.ai MCP client bugs that serialize
+   * parameters incorrectly (objects as strings, numbers as strings, etc.).
+   *
+   * Handles ALL type mismatches based on the tool's inputSchema:
+   *   string→object, string→array   : JSON.parse
+   *   string→number, string→integer : Number()
+   *   string→boolean                : "true"/"false" parsing
+   *   number→string, boolean→string : .toString()
+   */
+  private coerceStringifiedJsonParams(
+    toolName: string,
+    args: Record<string, any> | undefined
+  ): Record<string, any> | undefined {
+    if (!args || typeof args !== 'object') return args;
+
+    const allTools = [...n8nDocumentationToolsFinal, ...n8nManagementTools];
+    const tool = allTools.find(t => t.name === toolName);
+    if (!tool?.inputSchema?.properties) return args;
+
+    const properties = tool.inputSchema.properties;
+    const coerced = { ...args };
+    let coercedAny = false;
+
+    for (const [key, value] of Object.entries(coerced)) {
+      if (value === undefined || value === null) continue;
+
+      const propSchema = (properties as any)[key];
+      if (!propSchema) continue;
+      const expectedType = propSchema.type;
+      if (!expectedType) continue;
+
+      const actualType = typeof value;
+
+      // Already correct type — skip
+      if (expectedType === 'string' && actualType === 'string') continue;
+      if ((expectedType === 'number' || expectedType === 'integer') && actualType === 'number') continue;
+      if (expectedType === 'boolean' && actualType === 'boolean') continue;
+      if (expectedType === 'object' && actualType === 'object' && !Array.isArray(value)) continue;
+      if (expectedType === 'array' && Array.isArray(value)) continue;
+
+      // --- Coercion: string value → expected type ---
+      if (actualType === 'string') {
+        const trimmed = (value as string).trim();
+
+        if (expectedType === 'object' && trimmed.startsWith('{')) {
+          try {
+            const parsed = JSON.parse(trimmed);
+            if (typeof parsed === 'object' && parsed !== null && !Array.isArray(parsed)) {
+              coerced[key] = parsed;
+              coercedAny = true;
+            }
+          } catch { /* keep original */ }
+          continue;
+        }
+
+        if (expectedType === 'array' && trimmed.startsWith('[')) {
+          try {
+            const parsed = JSON.parse(trimmed);
+            if (Array.isArray(parsed)) {
+              coerced[key] = parsed;
+              coercedAny = true;
+            }
+          } catch { /* keep original */ }
+          continue;
+        }
+
+        if (expectedType === 'number' || expectedType === 'integer') {
+          const num = Number(trimmed);
+          if (!isNaN(num) && trimmed !== '') {
+            coerced[key] = expectedType === 'integer' ? Math.trunc(num) : num;
+            coercedAny = true;
+          }
+          continue;
+        }
+
+        if (expectedType === 'boolean') {
+          if (trimmed === 'true') { coerced[key] = true; coercedAny = true; }
+          else if (trimmed === 'false') { coerced[key] = false; coercedAny = true; }
+          continue;
+        }
+      }
+
+      // --- Coercion: number/boolean value → expected string ---
+      if (expectedType === 'string' && (actualType === 'number' || actualType === 'boolean')) {
+        coerced[key] = String(value);
+        coercedAny = true;
+        continue;
+      }
+    }
+
+    if (coercedAny) {
+      logger.warn(`Coerced mistyped params for tool "${toolName}"`, {
+        original: Object.fromEntries(
+          Object.entries(args).map(([k, v]) => [k, `${typeof v}: ${typeof v === 'string' ? v.substring(0, 80) : v}`])
+        ),
+      });
+    }
+
+    return coerced;
+  }
+
   async executeTool(name: string, args: any): Promise<any> {
     // Ensure args is an object and validate it
     args = args || {};
@@ -3910,8 +4130,33 @@ Full documentation is being prepared. For now, use get_node_essentials for confi
   }
   
   async shutdown(): Promise<void> {
+    // Prevent double-shutdown
+    if (this.isShutdown) {
+      logger.debug('Shutdown already called, skipping');
+      return;
+    }
+    this.isShutdown = true;
+
     logger.info('Shutting down MCP server...');
-    
+
+    // Wait for initialization to complete (or fail) before cleanup
+    // This prevents race conditions where shutdown runs while init is in progress
+    try {
+      await this.initialized;
+    } catch (error) {
+      // Initialization failed - that's OK, we still need to clean up
+      logger.debug('Initialization had failed, proceeding with cleanup', {
+        error: error instanceof Error ? error.message : String(error)
+      });
+    }
+
+    // Close MCP server connection (for consistency with close() method)
+    try {
+      await this.server.close();
+    } catch (error) {
+      logger.error('Error closing MCP server:', error);
+    }
+
     // Clean up cache timers to prevent memory leaks
     if (this.cache) {
       try {
@@ -3921,15 +4166,31 @@ Full documentation is being prepared. For now, use get_node_essentials for confi
         logger.error('Error cleaning up cache:', error);
       }
     }
-    
-    // Close database connection if it exists
-    if (this.db) {
+
+    // Handle database cleanup based on whether it's shared or dedicated
+    // For shared databases, we only release the reference (decrement refCount)
+    // For dedicated databases (in-memory for tests), we close the connection
+    if (this.useSharedDatabase && this.sharedDbState) {
       try {
-        await this.db.close();
+        releaseSharedDatabase(this.sharedDbState);
+        logger.info('Released shared database reference');
+      } catch (error) {
+        logger.error('Error releasing shared database:', error);
+      }
+    } else if (this.db) {
+      try {
+        this.db.close();
         logger.info('Database connection closed');
       } catch (error) {
         logger.error('Error closing database:', error);
       }
     }
+
+    // Null out references to help garbage collection
+    this.db = null;
+    this.repository = null;
+    this.templateService = null;
+    this.earlyLogger = null;
+    this.sharedDbState = null;
   }
 }

src/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.ts

@@ -194,12 +194,12 @@ Please choose a different name.
 - Can rename a node and add/remove connections using the new name in the same batch
 - Use \`validateOnly: true\` to preview effects before applying
 
-## Removing Properties with undefined
+## Removing Properties with null
 
-To remove a property from a node, set its value to \`undefined\` in the updates object. This is essential when migrating from deprecated properties or cleaning up optional configuration fields.
+To remove a property from a node, set its value to \`null\` in the updates object. This is essential when migrating from deprecated properties or cleaning up optional configuration fields.
 
-### Why Use undefined?
-- **Property removal vs. null**: Setting a property to \`undefined\` removes it completely from the node object, while \`null\` sets the property to a null value
+### Why Use null?
+- **Property removal**: Setting a property to \`null\` removes it completely from the node object
 - **Validation constraints**: Some properties are mutually exclusive (e.g., \`continueOnFail\` and \`onError\`). Simply setting one without removing the other will fail validation
 - **Deprecated property migration**: When n8n deprecates properties, you must remove the old property before the new one will work
 
@@ -211,7 +211,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "HTTP Request",
-    updates: { onError: undefined }
+    updates: { onError: null }
   }]
 });
 
@@ -221,7 +221,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeId: "node_abc",
-    updates: { disabled: undefined }
+    updates: { disabled: null }
   }]
 });
 \`\`\`
@@ -235,7 +235,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "API Request",
-    updates: { "parameters.authentication": undefined }
+    updates: { "parameters.authentication": null }
   }]
 });
 
@@ -245,7 +245,7 @@ n8n_update_partial_workflow({
   operations: [{
     type: "updateNode",
     nodeName: "HTTP Request",
-    updates: { "parameters.headers": undefined }
+    updates: { "parameters.headers": null }
   }]
 });
 \`\`\`
@@ -271,7 +271,7 @@ n8n_update_partial_workflow({
     type: "updateNode",
     nodeName: "HTTP Request",
     updates: {
-      continueOnFail: undefined,
+      continueOnFail: null,
       onError: "continueErrorOutput"
     }
   }]
@@ -287,15 +287,15 @@ n8n_update_partial_workflow({
     type: "updateNode",
     nodeName: "Data Processor",
     updates: {
-      continueOnFail: undefined,
-      alwaysOutputData: undefined,
-      "parameters.legacy_option": undefined
+      continueOnFail: null,
+      alwaysOutputData: null,
+      "parameters.legacy_option": null
     }
   }]
 });
 \`\`\`
 
-### When to Use undefined
+### When to Use null
 - Removing deprecated properties during migration
 - Cleaning up optional configuration flags
 - Resolving mutual exclusivity validation errors
@@ -341,11 +341,11 @@ n8n_update_partial_workflow({
       '// Rewire AI Agent to use different language model\nn8n_update_partial_workflow({id: "ai9", operations: [{type: "rewireConnection", source: "AI Agent", from: "OpenAI Chat Model", to: "Anthropic Chat Model", sourceOutput: "ai_languageModel"}]})',
       '// Replace all AI tools for an agent\nn8n_update_partial_workflow({id: "ai10", operations: [\n  {type: "removeConnection", source: "Old Tool 1", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "removeConnection", source: "Old Tool 2", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "addConnection", source: "New HTTP Tool", target: "AI Agent", sourceOutput: "ai_tool"},\n  {type: "addConnection", source: "New Code Tool", target: "AI Agent", sourceOutput: "ai_tool"}\n]})',
       '\n// ============ REMOVING PROPERTIES EXAMPLES ============',
-      '// Remove a simple property\nn8n_update_partial_workflow({id: "rm1", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {onError: undefined}}]})',
-      '// Migrate from deprecated continueOnFail to onError\nn8n_update_partial_workflow({id: "rm2", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {continueOnFail: undefined, onError: "continueErrorOutput"}}]})',
-      '// Remove nested property\nn8n_update_partial_workflow({id: "rm3", operations: [{type: "updateNode", nodeName: "API Request", updates: {"parameters.authentication": undefined}}]})',
-      '// Remove multiple properties\nn8n_update_partial_workflow({id: "rm4", operations: [{type: "updateNode", nodeName: "Data Processor", updates: {continueOnFail: undefined, alwaysOutputData: undefined, "parameters.legacy_option": undefined}}]})',
-      '// Remove entire array property\nn8n_update_partial_workflow({id: "rm5", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {"parameters.headers": undefined}}]})'
+      '// Remove a simple property\nn8n_update_partial_workflow({id: "rm1", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {onError: null}}]})',
+      '// Migrate from deprecated continueOnFail to onError\nn8n_update_partial_workflow({id: "rm2", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {continueOnFail: null, onError: "continueErrorOutput"}}]})',
+      '// Remove nested property\nn8n_update_partial_workflow({id: "rm3", operations: [{type: "updateNode", nodeName: "API Request", updates: {"parameters.authentication": null}}]})',
+      '// Remove multiple properties\nn8n_update_partial_workflow({id: "rm4", operations: [{type: "updateNode", nodeName: "Data Processor", updates: {continueOnFail: null, alwaysOutputData: null, "parameters.legacy_option": null}}]})',
+      '// Remove entire array property\nn8n_update_partial_workflow({id: "rm5", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {"parameters.headers": null}}]})'
     ],
     useCases: [
       'Rewire connections when replacing nodes',
@@ -383,9 +383,9 @@ n8n_update_partial_workflow({
       'Use targetIndex for fallback models (primary=0, fallback=1)',
       'Batch AI component connections in a single operation for atomicity',
       'Validate AI workflows after connection changes to catch configuration errors',
-      'To remove properties, set them to undefined (not null) in the updates object',
+      'To remove properties, set them to null in the updates object',
       'When migrating from deprecated properties, remove the old property and add the new one in the same operation',
-      'Use undefined to resolve mutual exclusivity validation errors between properties',
+      'Use null to resolve mutual exclusivity validation errors between properties',
       'Batch multiple property removals in a single updateNode operation for efficiency'
     ],
     pitfalls: [
@@ -407,8 +407,8 @@ n8n_update_partial_workflow({
       '**Auto-sanitization runs on ALL nodes**: When ANY update is made, ALL nodes in the workflow are sanitized (not just modified ones)',
       '**Auto-sanitization cannot fix everything**: It fixes operator structures and missing metadata, but cannot fix broken connections or branch mismatches',
       '**Corrupted workflows beyond repair**: Workflows in paradoxical states (API returns corrupt, API rejects updates) cannot be fixed via API - must be recreated',
-      'Setting a property to null does NOT remove it - use undefined instead',
-      'When properties are mutually exclusive (e.g., continueOnFail and onError), setting only the new property will fail - you must remove the old one with undefined',
+      'To remove a property, set it to null in the updates object',
+      'When properties are mutually exclusive (e.g., continueOnFail and onError), setting only the new property will fail - you must remove the old one with null',
       'Removing a required property may cause validation errors - check node documentation first',
       'Nested property removal with dot notation only removes the specific nested field, not the entire parent object',
       'Array index notation (e.g., "parameters.headers[0]") is not supported - remove the entire array property instead'

src/mcp/tools-n8n-manager.ts

@@ -284,7 +284,7 @@ export const n8nManagementTools: ToolDefinition[] = [
   },
   {
     name: 'n8n_autofix_workflow',
-    description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths.`,
+    description: `Automatically fix common workflow validation errors. Preview fixes or apply them. Fixes expression format, typeVersion, error output config, webhook paths, connection structure issues (numeric keys, invalid types, ID-to-name, duplicates, out-of-bounds indices).`,
     inputSchema: {
       type: 'object',
       properties: {
@@ -301,7 +301,7 @@ export const n8nManagementTools: ToolDefinition[] = [
           description: 'Types of fixes to apply (default: all)',
           items: {
             type: 'string',
-            enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration']
+            enum: ['expression-format', 'typeversion-correction', 'error-output-config', 'node-type-correction', 'webhook-missing-path', 'typeversion-upgrade', 'version-migration', 'tool-variant-correction', 'connection-numeric-keys', 'connection-invalid-type', 'connection-id-to-name', 'connection-duplicate-removal', 'connection-input-index']
           }
         },
         confidenceThreshold: {

src/mcp/ui/app-configs.ts

@@ -0,0 +1,36 @@
+import type { UIAppConfig } from './types';
+
+export const UI_APP_CONFIGS: UIAppConfig[] = [
+  {
+    id: 'operation-result',
+    displayName: 'Operation Result',
+    description: 'Visual summary of workflow operations (create, update, delete, test)',
+    uri: 'ui://n8n-mcp/operation-result',
+    mimeType: 'text/html;profile=mcp-app',
+    toolPatterns: [
+      'n8n_create_workflow',
+      'n8n_update_full_workflow',
+      'n8n_update_partial_workflow',
+      'n8n_delete_workflow',
+      'n8n_test_workflow',
+      'n8n_autofix_workflow',
+      // n8n_deploy_template disabled: Claude.ai renders blank content for this tool
+    ],
+  },
+  {
+    id: 'validation-summary',
+    displayName: 'Validation Summary',
+    description: 'Visual summary of node and workflow validation results',
+    uri: 'ui://n8n-mcp/validation-summary',
+    mimeType: 'text/html;profile=mcp-app',
+    toolPatterns: [
+      'validate_node',
+      'validate_workflow',
+      'n8n_validate_workflow',
+    ],
+  },
+  // workflow-list, execution-history, health-dashboard disabled:
+  // Claude.ai does not render these apps (shows collapsed accordions).
+  // The server sets _meta correctly on the wire but the host ignores it.
+  // Re-enable once the host-side issue is resolved.
+];

src/mcp/ui/index.ts

@@ -0,0 +1,3 @@
+export type { UIAppConfig, UIMetadata, UIAppEntry } from './types';
+export { UI_APP_CONFIGS } from './app-configs';
+export { UIAppRegistry } from './registry';

src/mcp/ui/registry.ts

@@ -0,0 +1,90 @@
+import { existsSync, readFileSync } from 'fs';
+import path from 'path';
+import { logger } from '../../utils/logger';
+import type { UIAppConfig, UIAppEntry } from './types';
+import { UI_APP_CONFIGS } from './app-configs';
+
+export class UIAppRegistry {
+  private static entries: Map<string, UIAppEntry> = new Map();
+  private static toolIndex: Map<string, UIAppEntry> = new Map();
+  private static loaded = false;
+
+  static load(): void {
+    // Resolve dist directory relative to package root
+    // In production: package-root/ui-apps/dist/
+    // __dirname will be src/mcp/ui or dist/mcp/ui
+    const packageRoot = path.resolve(__dirname, '..', '..', '..');
+    const distDir = path.join(packageRoot, 'ui-apps', 'dist');
+
+    this.entries.clear();
+    this.toolIndex.clear();
+
+    for (const config of UI_APP_CONFIGS) {
+      let html: string | null = null;
+      const htmlPath = path.join(distDir, config.id, 'index.html');
+
+      if (existsSync(htmlPath)) {
+        try {
+          html = readFileSync(htmlPath, 'utf-8');
+          logger.info(`Loaded UI app: ${config.id}`);
+        } catch (err) {
+          logger.warn(`Failed to read UI app HTML: ${config.id}`, err);
+        }
+      }
+
+      const entry: UIAppEntry = { config, html };
+      this.entries.set(config.id, entry);
+
+      // Build tool -> entry index
+      for (const pattern of config.toolPatterns) {
+        this.toolIndex.set(pattern, entry);
+      }
+    }
+
+    this.loaded = true;
+    logger.info(`UI App Registry loaded: ${this.entries.size} apps, ${this.toolIndex.size} tool mappings`);
+  }
+
+  static getAppForTool(toolName: string): UIAppEntry | null {
+    if (!this.loaded) return null;
+    return this.toolIndex.get(toolName) ?? null;
+  }
+
+  static getAppById(id: string): UIAppEntry | null {
+    if (!this.loaded) return null;
+    return this.entries.get(id) ?? null;
+  }
+
+  static getAllApps(): UIAppEntry[] {
+    if (!this.loaded) return [];
+    return Array.from(this.entries.values());
+  }
+
+  /**
+   * Enrich tool definitions with _meta.ui.resourceUri for tools that have
+   * a matching UI app. Per MCP ext-apps spec, this goes on the tool
+   * definition (tools/list), not the tool call response.
+   *
+   * Sets both nested (_meta.ui.resourceUri) and flat (_meta["ui/resourceUri"])
+   * keys for compatibility with hosts that read either format.
+   */
+  static injectToolMeta(tools: Array<{ name: string; [key: string]: any }>): void {
+    if (!this.loaded) return;
+    for (const tool of tools) {
+      const entry = this.toolIndex.get(tool.name);
+      if (entry && entry.html) {
+        tool._meta = {
+          ui: { resourceUri: entry.config.uri },
+          'ui/resourceUri': entry.config.uri,
+        };
+      }
+    }
+  }
+
+  /** Reset registry state. Intended for testing only. */
+  static reset(): void {
+    this.entries.clear();
+    this.toolIndex.clear();
+    this.loaded = false;
+  }
+}

src/mcp/ui/types.ts

@@ -0,0 +1,23 @@
+/**
+ * MCP Apps UI type definitions
+ */
+
+export interface UIAppConfig {
+  id: string;
+  displayName: string;
+  description: string;
+  uri: string;
+  mimeType: string;
+  toolPatterns: string[];
+}
+
+export interface UIMetadata {
+  ui: {
+    resourceUri: string;
+  };
+}
+
+export interface UIAppEntry {
+  config: UIAppConfig;
+  html: string | null;
+}

src/scripts/generate-community-docs.ts

@@ -11,6 +11,7 @@
  * Environment variables:
  *   N8N_MCP_LLM_BASE_URL  - LLM server URL (default: http://localhost:1234/v1)
  *   N8N_MCP_LLM_MODEL     - LLM model name (default: qwen3-4b-thinking-2507)
+ *   N8N_MCP_LLM_API_KEY   - LLM API key (falls back to OPENAI_API_KEY; default: 'not-needed')
  *   N8N_MCP_LLM_TIMEOUT   - Request timeout in ms (default: 60000)
  *   N8N_MCP_DB_PATH       - Database path (default: ./data/nodes.db)
  */
@@ -81,6 +82,7 @@ Options:
 Environment Variables:
   N8N_MCP_LLM_BASE_URL    LLM server URL (default: http://localhost:1234/v1)
   N8N_MCP_LLM_MODEL       LLM model name (default: qwen3-4b-thinking-2507)
+  N8N_MCP_LLM_API_KEY     LLM API key (falls back to OPENAI_API_KEY; default: 'not-needed')
   N8N_MCP_LLM_TIMEOUT     Request timeout in ms (default: 60000)
   N8N_MCP_DB_PATH         Database path (default: ./data/nodes.db)
 

src/services/ai-tool-validators.ts

@@ -28,6 +28,21 @@ export interface WorkflowNode {
   typeVersion?: number;
 }
 
+/**
+ * Get tool description from node, checking all possible property locations.
+ * Different n8n tool types store descriptions in different places:
+ * - toolDescription: HTTP Request Tool, Vector Store Tool
+ * - description: Workflow Tool, Code Tool, AI Agent Tool
+ * - options.description: SerpApi, Wikipedia, SearXNG
+ */
+function getToolDescription(node: WorkflowNode): string | undefined {
+  return (
+    node.parameters.toolDescription ||
+    node.parameters.description ||
+    node.parameters.options?.description
+  );
+}
+
 export interface WorkflowJson {
   name?: string;
   nodes: WorkflowNode[];
@@ -58,7 +73,7 @@ export function validateHTTPRequestTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -66,7 +81,7 @@ export function validateHTTPRequestTool(node: WorkflowNode): ValidationIssue[] {
       message: `HTTP Request Tool "${node.name}" has no toolDescription. Add a clear description to help the LLM know when to use this API.`,
       code: 'MISSING_TOOL_DESCRIPTION'
     });
-  } else if (node.parameters.toolDescription.trim().length < MIN_DESCRIPTION_LENGTH_MEDIUM) {
+  } else if (getToolDescription(node)!.trim().length < MIN_DESCRIPTION_LENGTH_MEDIUM) {
     issues.push({
       severity: 'warning',
       nodeId: node.id,
@@ -214,8 +229,8 @@ export function validateHTTPRequestTool(node: WorkflowNode): ValidationIssue[] {
 export function validateCodeTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
-  // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  // 1. Check toolDescription (REQUIRED) - check all possible locations
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -261,7 +276,7 @@ export function validateVectorStoreTool(
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -302,7 +317,7 @@ export function validateWorkflowTool(node: WorkflowNode, reverseConnections?: Ma
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -337,7 +352,7 @@ export function validateAIAgentTool(
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -378,7 +393,7 @@ export function validateMCPClientTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -406,20 +421,14 @@ export function validateMCPClientTool(node: WorkflowNode): ValidationIssue[] {
  * 7-8. Simple Tools (Calculator, Think) Validators
  * From spec lines 1868-2009
  */
-export function validateCalculatorTool(node: WorkflowNode): ValidationIssue[] {
-  const issues: ValidationIssue[] = [];
-
-  // Calculator Tool has a built-in description and is self-explanatory
-  // toolDescription is optional - no validation needed
-  return issues;
+export function validateCalculatorTool(_node: WorkflowNode): ValidationIssue[] {
+  // Calculator Tool has a built-in description - no validation needed
+  return [];
 }
 
-export function validateThinkTool(node: WorkflowNode): ValidationIssue[] {
-  const issues: ValidationIssue[] = [];
-
-  // Think Tool has a built-in description and is self-explanatory
-  // toolDescription is optional - no validation needed
-  return issues;
+export function validateThinkTool(_node: WorkflowNode): ValidationIssue[] {
+  // Think Tool has a built-in description - no validation needed
+  return [];
 }
 
 /**
@@ -430,7 +439,7 @@ export function validateSerpApiTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -457,7 +466,7 @@ export function validateWikipediaTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -487,7 +496,7 @@ export function validateSearXngTool(node: WorkflowNode): ValidationIssue[] {
   const issues: ValidationIssue[] = [];
 
   // 1. Check toolDescription (REQUIRED)
-  if (!node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'error',
       nodeId: node.id,
@@ -526,7 +535,7 @@ export function validateWolframAlphaTool(node: WorkflowNode): ValidationIssue[]
   }
 
   // 2. Check description (INFO)
-  if (!node.parameters.description && !node.parameters.toolDescription) {
+  if (!getToolDescription(node)) {
     issues.push({
       severity: 'info',
       nodeId: node.id,

src/services/n8n-api-client.ts

@@ -254,7 +254,7 @@ export class N8nApiClient {
 
   async activateWorkflow(id: string): Promise<Workflow> {
     try {
-      const response = await this.client.post(`/workflows/${id}/activate`);
+      const response = await this.client.post(`/workflows/${id}/activate`, {});
       return response.data;
     } catch (error) {
       throw handleN8nApiError(error);
@@ -263,7 +263,7 @@ export class N8nApiClient {
 
   async deactivateWorkflow(id: string): Promise<Workflow> {
     try {
-      const response = await this.client.post(`/workflows/${id}/deactivate`);
+      const response = await this.client.post(`/workflows/${id}/deactivate`, {});
       return response.data;
     } catch (error) {
       throw handleN8nApiError(error);
@@ -493,6 +493,15 @@ export class N8nApiClient {
     }
   }
 
+  async updateWorkflowTags(workflowId: string, tagIds: string[]): Promise<Tag[]> {
+    try {
+      const response = await this.client.put(`/workflows/${workflowId}/tags`, tagIds.filter(id => id).map(id => ({ id })));
+      return response.data;
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
   // Source Control Management (Enterprise feature)
   async getSourceControlStatus(): Promise<SourceControlStatus> {
     try {

src/services/node-sanitizer.ts

@@ -41,7 +41,7 @@ export function sanitizeWorkflowNodes(workflow: any): any {
 
   return {
     ...workflow,
-    nodes: workflow.nodes.map((node: any) => sanitizeNode(node))
+    nodes: workflow.nodes.map(sanitizeNode)
   };
 }
 
@@ -121,9 +121,7 @@ function sanitizeFilterConditions(conditions: any): any {
 
   // Sanitize conditions array
   if (sanitized.conditions && Array.isArray(sanitized.conditions)) {
-    sanitized.conditions = sanitized.conditions.map((condition: any) =>
-      sanitizeCondition(condition)
-    );
+    sanitized.conditions = sanitized.conditions.map(sanitizeCondition);
   }
 
   return sanitized;
@@ -214,18 +212,25 @@ function inferDataType(operation: string): string {
     return 'boolean';
   }
 
-  // Number operations
+  // Number operations (partial match to catch variants like "greaterThan" containing "gt")
   const numberOps = ['isNumeric', 'gt', 'gte', 'lt', 'lte'];
   if (numberOps.some(op => operation.includes(op))) {
     return 'number';
   }
 
-  // Date operations
+  // Date operations (partial match to catch variants like "isAfter" containing "after")
   const dateOps = ['after', 'before', 'afterDate', 'beforeDate'];
   if (dateOps.some(op => operation.includes(op))) {
     return 'dateTime';
   }
 
+  // Object operations: empty/notEmpty/exists/notExists are generic object-level checks
+  // (distinct from isEmpty/isNotEmpty which are boolean-typed operations)
+  const objectOps = ['empty', 'notEmpty', 'exists', 'notExists'];
+  if (objectOps.includes(operation)) {
+    return 'object';
+  }
+
   // Default to string
   return 'string';
 }
@@ -239,7 +244,11 @@ function isUnaryOperator(operation: string): boolean {
     'isNotEmpty',
     'true',
     'false',
-    'isNumeric'
+    'isNumeric',
+    'empty',
+    'notEmpty',
+    'exists',
+    'notExists'
   ];
   return unaryOps.includes(operation);
 }

src/services/node-specific-validators.ts

@@ -1374,8 +1374,11 @@ export class NodeSpecificValidators {
         });
       }
       
-      // Check for primitive return
-      if (/return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
+      // Skip primitive return check when helper functions are present,
+      // since we can't distinguish top-level vs nested returns without AST.
+      // Matches: function name(), const/let/var name = [async] function/arrow
+      const hasHelperFunctions = /(?:function\s+\w+\s*\(|(?:const|let|var)\s+\w+\s*=\s*(?:async\s+)?(?:function|\([^)]*\)\s*=>|\w+\s*=>))/.test(code);
+      if (!hasHelperFunctions && /return\s+(true|false|null|undefined|\d+|['"`])/m.test(code)) {
         errors.push({
           type: 'invalid_value',
           property: 'jsCode',
@@ -1487,7 +1490,7 @@ export class NodeSpecificValidators {
     // Check for common variable mistakes
     if (language === 'javaScript') {
       // Using $ without proper variable
-      if (/\$(?![a-zA-Z])/.test(code) && !code.includes('${')) {
+      if (/\$(?![a-zA-Z_(])/.test(code) && !code.includes('${')) {
         warnings.push({
           type: 'best_practice',
           message: 'Invalid $ usage detected',

src/services/type-structure-service.ts

@@ -90,7 +90,7 @@ export class TypeStructureService {
 	/**
 	 * Get all type structure definitions
 	 *
-	 * Returns a record of all 22 NodePropertyTypes with their structures.
+	 * Returns a record of all 23 NodePropertyTypes with their structures.
 	 * Useful for documentation, validation setup, or UI generation.
 	 *
 	 * @returns Record mapping all types to their structures

src/services/workflow-auto-fixer.ts

@@ -6,13 +6,14 @@
  */
 
 import crypto from 'crypto';
-import { WorkflowValidationResult } from './workflow-validator';
+import { WorkflowValidationResult, VALID_CONNECTION_TYPES } from './workflow-validator';
 import { ExpressionFormatIssue } from './expression-format-validator';
 import { NodeSimilarityService } from './node-similarity-service';
 import { NodeRepository } from '../database/node-repository';
 import {
   WorkflowDiffOperation,
-  UpdateNodeOperation
+  UpdateNodeOperation,
+  ReplaceConnectionsOperation
 } from '../types/workflow-diff';
 import { WorkflowNode, Workflow } from '../types/n8n-api';
 import { Logger } from '../utils/logger';
@@ -30,9 +31,22 @@ export type FixType =
   | 'error-output-config'
   | 'node-type-correction'
   | 'webhook-missing-path'
-  | 'typeversion-upgrade'     // Proactive version upgrades
-  | 'version-migration'       // Smart version migrations with breaking changes
-  | 'tool-variant-correction'; // Fix base nodes used as AI tools when Tool variant exists
+  | 'typeversion-upgrade'           // Proactive version upgrades
+  | 'version-migration'             // Smart version migrations with breaking changes
+  | 'tool-variant-correction'       // Fix base nodes used as AI tools when Tool variant exists
+  | 'connection-numeric-keys'       // "0","1" keys → main[0], main[1]
+  | 'connection-invalid-type'       // type:"0" → type:"main"
+  | 'connection-id-to-name'         // node ID refs → node name refs
+  | 'connection-duplicate-removal'  // Dedup identical connection entries
+  | 'connection-input-index';       // Out-of-bounds input index → clamped
+
+export const CONNECTION_FIX_TYPES: FixType[] = [
+  'connection-numeric-keys',
+  'connection-invalid-type',
+  'connection-id-to-name',
+  'connection-duplicate-removal',
+  'connection-input-index'
+];
 
 export interface AutoFixConfig {
   applyFixes: boolean;
@@ -175,6 +189,9 @@ export class WorkflowAutoFixer {
       await this.processVersionMigrationFixes(workflow, nodeMap, operations, fixes, postUpdateGuidance);
     }
 
+    // Process connection structure fixes (HIGH/MEDIUM confidence)
+    this.processConnectionFixes(workflow, validationResult, fullConfig, operations, fixes);
+
     // Filter by confidence threshold
     const filteredFixes = this.filterByConfidence(fixes, fullConfig.confidenceThreshold);
     const filteredOperations = this.filterOperationsByFixes(operations, filteredFixes, fixes);
@@ -655,10 +672,14 @@ export class WorkflowAutoFixer {
     allFixes: FixOperation[]
   ): WorkflowDiffOperation[] {
     const fixedNodes = new Set(filteredFixes.map(f => f.node));
+    const hasConnectionFixes = filteredFixes.some(f => CONNECTION_FIX_TYPES.includes(f.type));
     return operations.filter(op => {
       if (op.type === 'updateNode') {
         return fixedNodes.has(op.nodeId || '');
       }
+      if (op.type === 'replaceConnections') {
+        return hasConnectionFixes;
+      }
       return true;
     });
   }
@@ -677,7 +698,12 @@ export class WorkflowAutoFixer {
         'webhook-missing-path': 0,
         'typeversion-upgrade': 0,
         'version-migration': 0,
-        'tool-variant-correction': 0
+        'tool-variant-correction': 0,
+        'connection-numeric-keys': 0,
+        'connection-invalid-type': 0,
+        'connection-id-to-name': 0,
+        'connection-duplicate-removal': 0,
+        'connection-input-index': 0
       },
       byConfidence: {
         'high': 0,
@@ -730,6 +756,16 @@ export class WorkflowAutoFixer {
       parts.push(`${stats.byType['tool-variant-correction']} tool variant ${stats.byType['tool-variant-correction'] === 1 ? 'correction' : 'corrections'}`);
     }
 
+    const connectionIssueCount =
+      (stats.byType['connection-numeric-keys'] || 0) +
+      (stats.byType['connection-invalid-type'] || 0) +
+      (stats.byType['connection-id-to-name'] || 0) +
+      (stats.byType['connection-duplicate-removal'] || 0) +
+      (stats.byType['connection-input-index'] || 0);
+    if (connectionIssueCount > 0) {
+      parts.push(`${connectionIssueCount} connection ${connectionIssueCount === 1 ? 'issue' : 'issues'}`);
+    }
+
     if (parts.length === 0) {
       return `Fixed ${stats.total} ${stats.total === 1 ? 'issue' : 'issues'}`;
     }
@@ -737,6 +773,370 @@ export class WorkflowAutoFixer {
     return `Fixed ${parts.join(', ')}`;
   }
 
+  /**
+   * Process connection structure fixes.
+   * Deep-clones workflow.connections, applies fixes in order:
+   * numeric keys → ID-to-name → invalid type → input index → dedup
+   * Emits a single ReplaceConnectionsOperation if any corrections were made.
+   */
+  private processConnectionFixes(
+    workflow: Workflow,
+    validationResult: WorkflowValidationResult,
+    config: AutoFixConfig,
+    operations: WorkflowDiffOperation[],
+    fixes: FixOperation[]
+  ): void {
+    if (!workflow.connections || Object.keys(workflow.connections).length === 0) {
+      return;
+    }
+
+    // Build lookup maps
+    const idToNameMap = new Map<string, string>();
+    const nameSet = new Set<string>();
+    for (const node of workflow.nodes) {
+      idToNameMap.set(node.id, node.name);
+      nameSet.add(node.name);
+    }
+
+    // Deep-clone connections
+    const conn: any = JSON.parse(JSON.stringify(workflow.connections));
+    let anyFixed = false;
+
+    // 1. Fix numeric source keys ("0" → main[0])
+    if (!config.fixTypes || config.fixTypes.includes('connection-numeric-keys')) {
+      const numericKeyResult = this.fixNumericKeys(conn);
+      if (numericKeyResult.length > 0) {
+        fixes.push(...numericKeyResult);
+        anyFixed = true;
+      }
+    }
+
+    // 2. Fix ID-to-name references (source keys and .node values)
+    if (!config.fixTypes || config.fixTypes.includes('connection-id-to-name')) {
+      const idToNameResult = this.fixIdToName(conn, idToNameMap, nameSet);
+      if (idToNameResult.length > 0) {
+        fixes.push(...idToNameResult);
+        anyFixed = true;
+      }
+    }
+
+    // 3. Fix invalid connection types
+    if (!config.fixTypes || config.fixTypes.includes('connection-invalid-type')) {
+      const invalidTypeResult = this.fixInvalidTypes(conn);
+      if (invalidTypeResult.length > 0) {
+        fixes.push(...invalidTypeResult);
+        anyFixed = true;
+      }
+    }
+
+    // 4. Fix out-of-bounds input indices
+    if (!config.fixTypes || config.fixTypes.includes('connection-input-index')) {
+      const inputIndexResult = this.fixInputIndices(conn, validationResult, workflow);
+      if (inputIndexResult.length > 0) {
+        fixes.push(...inputIndexResult);
+        anyFixed = true;
+      }
+    }
+
+    // 5. Dedup identical connection entries
+    if (!config.fixTypes || config.fixTypes.includes('connection-duplicate-removal')) {
+      const dedupResult = this.fixDuplicateConnections(conn);
+      if (dedupResult.length > 0) {
+        fixes.push(...dedupResult);
+        anyFixed = true;
+      }
+    }
+
+    if (anyFixed) {
+      const op: ReplaceConnectionsOperation = {
+        type: 'replaceConnections',
+        connections: conn
+      };
+      operations.push(op);
+    }
+  }
+
+  /**
+   * Fix numeric connection output keys ("0", "1" → main[0], main[1])
+   */
+  private fixNumericKeys(conn: any): FixOperation[] {
+    const fixes: FixOperation[] = [];
+    const sourceNodes = Object.keys(conn);
+
+    for (const sourceName of sourceNodes) {
+      const nodeConn = conn[sourceName];
+      const numericKeys = Object.keys(nodeConn).filter(k => /^\d+$/.test(k));
+
+      if (numericKeys.length === 0) continue;
+
+      // Ensure main array exists
+      if (!nodeConn['main']) {
+        nodeConn['main'] = [];
+      }
+
+      for (const numKey of numericKeys) {
+        const index = parseInt(numKey, 10);
+        const entries = nodeConn[numKey];
+
+        // Extend main array if needed (fill gaps with empty arrays)
+        while (nodeConn['main'].length <= index) {
+          nodeConn['main'].push([]);
+        }
+
+        // Merge entries into main[index]
+        const hadExisting = nodeConn['main'][index] && nodeConn['main'][index].length > 0;
+        if (Array.isArray(entries)) {
+          for (const outputGroup of entries) {
+            if (Array.isArray(outputGroup)) {
+              nodeConn['main'][index] = [
+                ...nodeConn['main'][index],
+                ...outputGroup
+              ];
+            }
+          }
+        }
+
+        if (hadExisting) {
+          logger.warn(`Merged numeric key "${numKey}" into existing main[${index}] on node "${sourceName}" - dedup pass will clean exact duplicates`);
+        }
+
+        fixes.push({
+          node: sourceName,
+          field: `connections.${sourceName}.${numKey}`,
+          type: 'connection-numeric-keys',
+          before: numKey,
+          after: `main[${index}]`,
+          confidence: hadExisting ? 'medium' : 'high',
+          description: hadExisting
+            ? `Merged numeric connection key "${numKey}" into existing main[${index}] on node "${sourceName}"`
+            : `Converted numeric connection key "${numKey}" to main[${index}] on node "${sourceName}"`
+        });
+
+        delete nodeConn[numKey];
+      }
+    }
+
+    return fixes;
+  }
+
+  /**
+   * Fix node ID references in connections (replace IDs with names)
+   */
+  private fixIdToName(
+    conn: any,
+    idToNameMap: Map<string, string>,
+    nameSet: Set<string>
+  ): FixOperation[] {
+    const fixes: FixOperation[] = [];
+
+    // Build rename plan for source keys, then check for collisions
+    const renames: Array<{ oldKey: string; newKey: string }> = [];
+    const sourceKeys = Object.keys(conn);
+    for (const sourceKey of sourceKeys) {
+      if (idToNameMap.has(sourceKey) && !nameSet.has(sourceKey)) {
+        renames.push({ oldKey: sourceKey, newKey: idToNameMap.get(sourceKey)! });
+      }
+    }
+
+    // Check for collisions among renames (two IDs mapping to the same name)
+    const newKeyCount = new Map<string, number>();
+    for (const r of renames) {
+      newKeyCount.set(r.newKey, (newKeyCount.get(r.newKey) || 0) + 1);
+    }
+    const safeRenames = renames.filter(r => {
+      if ((newKeyCount.get(r.newKey) || 0) > 1) {
+        logger.warn(`Skipping ambiguous ID-to-name rename: "${r.oldKey}" → "${r.newKey}" (multiple IDs map to same name)`);
+        return false;
+      }
+      return true;
+    });
+
+    for (const { oldKey, newKey } of safeRenames) {
+      conn[newKey] = conn[oldKey];
+      delete conn[oldKey];
+      fixes.push({
+        node: newKey,
+        field: `connections.sourceKey`,
+        type: 'connection-id-to-name',
+        before: oldKey,
+        after: newKey,
+        confidence: 'high',
+        description: `Replaced node ID "${oldKey}" with name "${newKey}" as connection source key`
+      });
+    }
+
+    // Fix .node values that are node IDs
+    for (const sourceName of Object.keys(conn)) {
+      const nodeConn = conn[sourceName];
+      for (const outputKey of Object.keys(nodeConn)) {
+        const outputs = nodeConn[outputKey];
+        if (!Array.isArray(outputs)) continue;
+        for (const outputGroup of outputs) {
+          if (!Array.isArray(outputGroup)) continue;
+          for (const entry of outputGroup) {
+            if (entry && entry.node && idToNameMap.has(entry.node) && !nameSet.has(entry.node)) {
+              const oldNode = entry.node;
+              const newNode = idToNameMap.get(entry.node)!;
+              entry.node = newNode;
+              fixes.push({
+                node: sourceName,
+                field: `connections.${sourceName}.${outputKey}[].node`,
+                type: 'connection-id-to-name',
+                before: oldNode,
+                after: newNode,
+                confidence: 'high',
+                description: `Replaced target node ID "${oldNode}" with name "${newNode}" in connection from "${sourceName}"`
+              });
+            }
+          }
+        }
+      }
+    }
+
+    return fixes;
+  }
+
+  /**
+   * Fix invalid connection types in entries (e.g., type:"0" → type:"main")
+   */
+  private fixInvalidTypes(conn: any): FixOperation[] {
+    const fixes: FixOperation[] = [];
+
+    for (const sourceName of Object.keys(conn)) {
+      const nodeConn = conn[sourceName];
+      for (const outputKey of Object.keys(nodeConn)) {
+        const outputs = nodeConn[outputKey];
+        if (!Array.isArray(outputs)) continue;
+        for (const outputGroup of outputs) {
+          if (!Array.isArray(outputGroup)) continue;
+          for (const entry of outputGroup) {
+            if (entry && entry.type && !VALID_CONNECTION_TYPES.has(entry.type)) {
+              const oldType = entry.type;
+              // Use the parent output key if it's valid, otherwise default to "main"
+              const newType = VALID_CONNECTION_TYPES.has(outputKey) ? outputKey : 'main';
+              entry.type = newType;
+              fixes.push({
+                node: sourceName,
+                field: `connections.${sourceName}.${outputKey}[].type`,
+                type: 'connection-invalid-type',
+                before: oldType,
+                after: newType,
+                confidence: 'high',
+                description: `Fixed invalid connection type "${oldType}" → "${newType}" in connection from "${sourceName}" to "${entry.node}"`
+              });
+            }
+          }
+        }
+      }
+    }
+
+    return fixes;
+  }
+
+  /**
+   * Fix out-of-bounds input indices (clamp to valid range)
+   */
+  private fixInputIndices(
+    conn: any,
+    validationResult: WorkflowValidationResult,
+    workflow: Workflow
+  ): FixOperation[] {
+    const fixes: FixOperation[] = [];
+
+    // Parse INPUT_INDEX_OUT_OF_BOUNDS errors from validation
+    for (const error of validationResult.errors) {
+      if (error.code !== 'INPUT_INDEX_OUT_OF_BOUNDS') continue;
+
+      const targetNodeName = error.nodeName;
+      if (!targetNodeName) continue;
+
+      // Extract the bad index and input count from the error message
+      const match = error.message.match(/Input index (\d+).*?has (\d+) main input/);
+      if (!match) {
+        logger.warn(`Could not parse INPUT_INDEX_OUT_OF_BOUNDS error for node "${targetNodeName}": ${error.message}`);
+        continue;
+      }
+
+      const badIndex = parseInt(match[1], 10);
+      const inputCount = parseInt(match[2], 10);
+
+      // For multi-input nodes, clamp to max valid index; for single-input, reset to 0
+      const clampedIndex = inputCount > 1 ? Math.min(badIndex, inputCount - 1) : 0;
+
+      // Find and fix the bad index in connections
+      for (const sourceName of Object.keys(conn)) {
+        const nodeConn = conn[sourceName];
+        for (const outputKey of Object.keys(nodeConn)) {
+          const outputs = nodeConn[outputKey];
+          if (!Array.isArray(outputs)) continue;
+          for (const outputGroup of outputs) {
+            if (!Array.isArray(outputGroup)) continue;
+            for (const entry of outputGroup) {
+              if (entry && entry.node === targetNodeName && entry.index === badIndex) {
+                entry.index = clampedIndex;
+                fixes.push({
+                  node: sourceName,
+                  field: `connections.${sourceName}.${outputKey}[].index`,
+                  type: 'connection-input-index',
+                  before: badIndex,
+                  after: clampedIndex,
+                  confidence: 'medium',
+                  description: `Clamped input index ${badIndex} → ${clampedIndex} for target node "${targetNodeName}" (has ${inputCount} input${inputCount === 1 ? '' : 's'})`
+                });
+              }
+            }
+          }
+        }
+      }
+    }
+
+    return fixes;
+  }
+
+  /**
+   * Remove duplicate connection entries (same node, type, index)
+   */
+  private fixDuplicateConnections(conn: any): FixOperation[] {
+    const fixes: FixOperation[] = [];
+
+    for (const sourceName of Object.keys(conn)) {
+      const nodeConn = conn[sourceName];
+      for (const outputKey of Object.keys(nodeConn)) {
+        const outputs = nodeConn[outputKey];
+        if (!Array.isArray(outputs)) continue;
+        for (let i = 0; i < outputs.length; i++) {
+          const outputGroup = outputs[i];
+          if (!Array.isArray(outputGroup)) continue;
+
+          const seen = new Set<string>();
+          const deduped: any[] = [];
+
+          for (const entry of outputGroup) {
+            const key = JSON.stringify({ node: entry.node, type: entry.type, index: entry.index });
+            if (seen.has(key)) {
+              fixes.push({
+                node: sourceName,
+                field: `connections.${sourceName}.${outputKey}[${i}]`,
+                type: 'connection-duplicate-removal',
+                before: entry,
+                after: null,
+                confidence: 'high',
+                description: `Removed duplicate connection from "${sourceName}" to "${entry.node}" (type: ${entry.type}, index: ${entry.index})`
+              });
+            } else {
+              seen.add(key);
+              deduped.push(entry);
+            }
+          }
+
+          outputs[i] = deduped;
+        }
+      }
+    }
+
+    return fixes;
+  }
+
   /**
    * Process version upgrade fixes (proactive upgrades to latest versions)
    * HIGH confidence for non-breaking upgrades, MEDIUM for upgrades with auto-migratable changes