docs: fix connection keys documentation to say "node names" not "node IDs" (#510 ) (#511 )

The documentation incorrectly stated connection keys should be "node IDs" when n8n actually requires "node names". This caused workflow creation failures for AI-generated workflows. Changes: - tools-n8n-manager.ts: "Keys are source node names (the name field, not id)" - n8n-create-workflow.ts: "Keys are source node names (not IDs)" - Fixed example: "Webhook"/"Slack" instead of "webhook_1"/"slack_1" - get-template.ts: clarified "source node names" Closes #510 Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
chore: update n8n to 2.1.4 and bump version to 2.31.2 (#507 )
2026-01-30 22:42:04 +00:00 · 2025-12-26 14:50:58 +01:00 · 2025-12-24 15:15:22 +01:00 · 2025-12-23 18:50:55 +01:00
28 changed files with 864 additions and 331 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,74 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [Unreleased]

+## [2.31.3] - 2025-12-26
+
+### Fixed
+
+**Documentation Bug: Connection Keys Say "Node IDs" but Require "Node Names" (Issue #510)**
+
+Fixed documentation that incorrectly stated connection keys should be "node IDs" when n8n actually requires "node names".
+
+**Problem:**
+The `n8n_create_workflow` documentation and examples showed using node IDs (e.g., `"webhook_1"`) as connection keys, but the validator requires node names (e.g., `"Webhook"`). This caused workflow creation failures and contributed to low success rates for AI-generated workflows.
+
+**Changes:**
+- Updated `tools-n8n-manager.ts` parameter description: "Keys are source node names (the name field, not id)"
+- Updated `n8n-create-workflow.ts` documentation: "Keys are source node names (not IDs)"
+- Fixed example to use `"Webhook"` and `"Slack"` instead of `"webhook_1"` and `"slack_1"`
+- Clarified `get-template.ts` return description
+
+**Before (incorrect):**
+```javascript
+connections: {
+  "webhook_1": { "main": [[{node: "slack_1", ...}]] }  // WRONG
+}
+```
+
+**After (correct):**
+```javascript
+connections: {
+  "Webhook": { "main": [[{node: "Slack", ...}]] }  // CORRECT
+}
+```
+
+**Impact:**
+- AI models following documentation will now generate valid workflows
+- Clear distinction between node `id` (internal identifier) and `name` (connection key)
+- No breaking changes - validator behavior unchanged
+
+## [2.31.2] - 2025-12-24
+
+### Changed
+
+- Updated n8n from 2.0.2 to 2.1.4
+- Updated n8n-core from 2.0.1 to 2.1.3
+- Updated n8n-workflow from 2.0.1 to 2.1.1
+- Updated @n8n/n8n-nodes-langchain from 2.0.1 to 2.1.3
+- Rebuilt node database with 540 nodes (434 from n8n-nodes-base, 106 from @n8n/n8n-nodes-langchain)
+- Refreshed template database with 2,737 workflow templates from n8n.io
+
+## [2.31.1] - 2025-12-23
+
+### Fixed
+
+**mcpTrigger Nodes No Longer Incorrectly Flagged as "Disconnected" (Issue #503)**
+
+Fixed a validation bug where `mcpTrigger` nodes were incorrectly flagged as "disconnected nodes" when using `n8n_update_partial_workflow` or `n8n_update_full_workflow`. This blocked ALL updates to MCP server workflows.
+
+**Root Cause:**
+The `validateWorkflowStructure()` function only checked `main` connections when building the connected nodes set, ignoring AI connection types (`ai_tool`, `ai_languageModel`, `ai_memory`, `ai_embedding`, `ai_vectorStore`). Additionally, trigger nodes were only checked for outgoing connections, but `mcpTrigger` only receives inbound `ai_tool` connections.
+
+**Changes:**
+- Extended connection validation to check all 7 connection types (main, error, ai_tool, ai_languageModel, ai_memory, ai_embedding, ai_vectorStore)
+- Updated trigger node validation to accept either outgoing OR inbound connections
+- Added 7 new tests covering all AI connection types
+
+**Impact:**
+- MCP server workflows can now be updated, renamed, and deactivated normally
+- All `n8n_update_*` operations work correctly for AI workflows
+- No breaking changes for existing workflows
+
 ## [2.31.0] - 2025-12-23

 ### Added
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 [![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-2.0.2-orange.svg)](https://github.com/n8n-io/n8n)
+[![n8n version](https://img.shields.io/badge/n8n-2.1.4-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/data/nodes.db
+++ b/data/nodes.db
--- a/dist/mcp/handlers-n8n-manager.d.ts.map
+++ b/dist/mcp/handlers-n8n-manager.d.ts.map
@@ -1 +1 @@
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+{"version":3,"file":"handlers-n8n-manager.d.ts","sourceRoot":"","sources":["../../src/mcp/handlers-n8n-manager.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,YAAY,EAAE,MAAM,4BAA4B,CAAC;AAE1D,OAAO,EAML,eAAe,EAGhB,MAAM,kBAAkB,CAAC;AAkB1B,OAAO,EAAE,cAAc,EAAE,MAAM,6BAA6B,CAAC;AAC7D,OAAO,EAAE,eAAe,EAA2B,MAAM,2BAA2B,CAAC;AAOrF,OAAO,EAAE,eAAe,EAAE,MAAM,+BAA+B,CAAC;AAqNhE,wBAAgB,0BAA0B,IAAI,MAAM,CAEnD;AAMD,wBAAgB,uBAAuB,gDAEtC;AAKD,wBAAgB,kBAAkB,IAAI,IAAI,CAIzC;AAED,wBAAgB,eAAe,CAAC,OAAO,CAAC,EAAE,eAAe,GAAG,YAAY,GAAG,IAAI,CAgF9E;AAqHD,wBAAsB,oBAAoB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAmF7G;AAED,wBAAsB,iBAAiB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAiC1G;AAED,wBAAsB,wBAAwB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAoDjH;AAED,wBAAsB,0BAA0B,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAmDnH;AAED,wBAAsB,wBAAwB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAyCjH;AAED,wBAAsB,oBAAoB,CACxC,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CA8H1B;AAeD,wBAAsB,oBAAoB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAsC7G;AAED,wBAAsB,mBAAmB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAiE5G;AAED,wBAAsB,sBAAsB,CAC1C,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CA0F1B;AAED,wBAAsB,qBAAqB,CACzC,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CAoK1B;AAQD,wBAAsB,kBAAkB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAwJ3G;AAED,wBAAsB,kBAAkB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CA8H3G;AAED,wBAAsB,oBAAoB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAgD7G;AAED,wBAAsB,qBAAqB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAiC9G;AAID,wBAAsB,iBAAiB,CAAC,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAwG3F;AAkLD,wBAAsB,gBAAgB,CAAC,OAAO,EAAE,GAAG,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAkQxG;AAED,wBAAsB,sBAAsB,CAC1C,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CAsL1B;AA+BD,wBAAsB,oBAAoB,CACxC,IAAI,EAAE,OAAO,EACb,eAAe,EAAE,eAAe,EAChC,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CAoM1B;AAQD,wBAAsB,4BAA4B,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CAyErH"}
--- a/dist/mcp/handlers-n8n-manager.js
+++ b/dist/mcp/handlers-n8n-manager.js
@@ -1024,14 +1024,18 @@ async function handleGetExecution(args, context) {
        const client = ensureApiConfigured(context);
        const schema = zod_1.z.object({
            id: zod_1.z.string(),
-            mode: zod_1.z.enum(['preview', 'summary', 'filtered', 'full']).optional(),
+            mode: zod_1.z.enum(['preview', 'summary', 'filtered', 'full', 'error']).optional(),
            nodeNames: zod_1.z.array(zod_1.z.string()).optional(),
            itemsLimit: zod_1.z.number().optional(),
            includeInputData: zod_1.z.boolean().optional(),
-            includeData: zod_1.z.boolean().optional()
+            includeData: zod_1.z.boolean().optional(),
+            errorItemsLimit: zod_1.z.number().min(0).max(100).optional(),
+            includeStackTrace: zod_1.z.boolean().optional(),
+            includeExecutionPath: zod_1.z.boolean().optional(),
+            fetchWorkflow: zod_1.z.boolean().optional()
        });
        const params = schema.parse(args);
-        const { id, mode, nodeNames, itemsLimit, includeInputData, includeData } = params;
+        const { id, mode, nodeNames, itemsLimit, includeInputData, includeData, errorItemsLimit, includeStackTrace, includeExecutionPath, fetchWorkflow } = params;
        let effectiveMode = mode;
        if (!effectiveMode && includeData !== undefined) {
            effectiveMode = includeData ? 'summary' : undefined;
@@ -1044,13 +1048,28 @@ async function handleGetExecution(args, context) {
                data: execution
            };
        }
+        let workflow;
+        if (effectiveMode === 'error' && fetchWorkflow !== false && execution.workflowId) {
+            try {
+                workflow = await client.getWorkflow(execution.workflowId);
+            }
+            catch (e) {
+                logger_1.logger.debug('Could not fetch workflow for error analysis', {
+                    workflowId: execution.workflowId,
+                    error: e instanceof Error ? e.message : 'Unknown error'
+                });
+            }
+        }
        const filterOptions = {
            mode: effectiveMode,
            nodeNames,
            itemsLimit,
-            includeInputData
+            includeInputData,
+            errorItemsLimit,
+            includeStackTrace,
+            includeExecutionPath
        };
-        const processedExecution = (0, execution_processor_1.processExecution)(execution, filterOptions);
+        const processedExecution = (0, execution_processor_1.processExecution)(execution, filterOptions, workflow);
        return {
            success: true,
            data: processedExecution
--- a/dist/mcp/handlers-n8n-manager.js.map
+++ b/dist/mcp/handlers-n8n-manager.js.map
--- a/dist/mcp/tool-docs/workflow_management/n8n-executions.d.ts.map
+++ b/dist/mcp/tool-docs/workflow_management/n8n-executions.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"n8n-executions.d.ts","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/n8n-executions.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,UAAU,CAAC;AAE7C,eAAO,MAAM,gBAAgB,EAAE,iBA+E9B,CAAC"}
+{"version":3,"file":"n8n-executions.d.ts","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/n8n-executions.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,UAAU,CAAC;AAE7C,eAAO,MAAM,gBAAgB,EAAE,iBAwG9B,CAAC"}
--- a/dist/mcp/tool-docs/workflow_management/n8n-executions.js
+++ b/dist/mcp/tool-docs/workflow_management/n8n-executions.js
@@ -6,13 +6,14 @@ exports.n8nExecutionsDoc = {
    category: 'workflow_management',
    essentials: {
        description: 'Manage workflow executions: get details, list, or delete. Unified tool for all execution operations.',
-        keyParameters: ['action', 'id', 'workflowId', 'status'],
-        example: 'n8n_executions({action: "list", workflowId: "abc123", status: "error"})',
+        keyParameters: ['action', 'id', 'workflowId', 'status', 'mode'],
+        example: 'n8n_executions({action: "get", id: "exec_456", mode: "error"})',
        performance: 'Fast (50-200ms)',
        tips: [
            'action="get": Get execution details by ID',
            'action="list": List executions with filters',
            'action="delete": Delete execution record',
+            'Use mode="error" for efficient failure debugging (80-90% token savings)',
            'Use mode parameter for action=get to control detail level'
        ]
    },
@@ -26,14 +27,26 @@ exports.n8nExecutionsDoc = {
 - preview: Structure only, no data
 - summary: 2 items per node (default)
 - filtered: Custom items limit, optionally filter by node names
- full: All execution data (can be very large)`,
+- full: All execution data (can be very large)
+- error: Optimized for debugging failures - extracts error info, upstream context, and AI suggestions
+
+**Error Mode Features:**
+- Extracts error message, type, and node configuration
+- Samples input data from upstream node (configurable limit)
+- Shows execution path leading to error
+- Provides AI-friendly fix suggestions based on error patterns
+- Token-efficient (80-90% smaller than full mode)`,
        parameters: {
            action: { type: 'string', required: true, description: 'Operation: "get", "list", or "delete"' },
            id: { type: 'string', required: false, description: 'Execution ID (required for action=get or action=delete)' },
-            mode: { type: 'string', required: false, description: 'For action=get: "preview", "summary" (default), "filtered", "full"' },
+            mode: { type: 'string', required: false, description: 'For action=get: "preview", "summary" (default), "filtered", "full", "error"' },
            nodeNames: { type: 'array', required: false, description: 'For action=get with mode=filtered: Filter to specific nodes by name' },
            itemsLimit: { type: 'number', required: false, description: 'For action=get with mode=filtered: Items per node (0=structure, 2=default, -1=unlimited)' },
            includeInputData: { type: 'boolean', required: false, description: 'For action=get: Include input data in addition to output (default: false)' },
+            errorItemsLimit: { type: 'number', required: false, description: 'For action=get with mode=error: Sample items from upstream (default: 2, max: 100)' },
+            includeStackTrace: { type: 'boolean', required: false, description: 'For action=get with mode=error: Include full stack trace (default: false, shows truncated)' },
+            includeExecutionPath: { type: 'boolean', required: false, description: 'For action=get with mode=error: Include execution path (default: true)' },
+            fetchWorkflow: { type: 'boolean', required: false, description: 'For action=get with mode=error: Fetch workflow for accurate upstream detection (default: true)' },
            workflowId: { type: 'string', required: false, description: 'For action=list: Filter by workflow ID' },
            status: { type: 'string', required: false, description: 'For action=list: Filter by status ("success", "error", "waiting")' },
            limit: { type: 'number', required: false, description: 'For action=list: Number of results (1-100, default: 100)' },
@@ -42,10 +55,15 @@ exports.n8nExecutionsDoc = {
            includeData: { type: 'boolean', required: false, description: 'For action=list: Include execution data (default: false)' }
        },
        returns: `Depends on action:
- get: Execution object with data based on mode
+- get (error mode): { errorInfo: { primaryError, upstreamContext, executionPath, suggestions }, summary }
+- get (other modes): Execution object with data based on mode
 - list: { data: [...executions], nextCursor?: string }
 - delete: { success: boolean, message: string }`,
        examples: [
+            '// Debug a failed execution (recommended for errors)\nn8n_executions({action: "get", id: "exec_456", mode: "error"})',
+            '// Debug with more sample data from upstream\nn8n_executions({action: "get", id: "exec_456", mode: "error", errorItemsLimit: 5})',
+            '// Debug with full stack trace\nn8n_executions({action: "get", id: "exec_456", mode: "error", includeStackTrace: true})',
+            '// Debug without workflow fetch (faster but less accurate)\nn8n_executions({action: "get", id: "exec_456", mode: "error", fetchWorkflow: false})',
            '// List recent executions for a workflow\nn8n_executions({action: "list", workflowId: "abc123", limit: 10})',
            '// List failed executions\nn8n_executions({action: "list", status: "error"})',
            '// Get execution summary\nn8n_executions({action: "get", id: "exec_456"})',
@@ -54,7 +72,10 @@ exports.n8nExecutionsDoc = {
            '// Delete an execution\nn8n_executions({action: "delete", id: "exec_456"})'
        ],
        useCases: [
-            'Debug workflow failures (get with mode=full)',
+            'Debug workflow failures efficiently (mode=error) - 80-90% token savings',
+            'Get AI suggestions for fixing common errors',
+            'Analyze input data that caused failure',
+            'Debug workflow failures with full data (mode=full)',
            'Monitor workflow health (list with status filter)',
            'Audit execution history',
            'Clean up old execution records',
@@ -63,18 +84,22 @@ exports.n8nExecutionsDoc = {
        performance: `Response times:
 - list: 50-150ms depending on filters
 - get (preview/summary): 30-100ms
+- get (error): 50-200ms (includes optional workflow fetch)
 - get (full): 100-500ms+ depending on data size
 - delete: 30-80ms`,
        bestPractices: [
-            'Use mode="summary" (default) for debugging - shows enough data',
+            'Use mode="error" for debugging failed executions - 80-90% token savings vs full',
+            'Use mode="summary" (default) for quick inspection',
            'Use mode="filtered" with nodeNames for large workflows',
            'Filter by workflowId when listing to reduce results',
            'Use cursor for pagination through large result sets',
+            'Set fetchWorkflow=false if you already know the workflow structure',
            'Delete old executions to save storage'
        ],
        pitfalls: [
            'Requires N8N_API_URL and N8N_API_KEY configured',
            'mode="full" can return very large responses for complex workflows',
+            'mode="error" fetches workflow by default (adds ~50-100ms), disable with fetchWorkflow=false',
            'Execution must exist or returns 404',
            'Delete is permanent - cannot undo'
        ],
--- a/dist/mcp/tool-docs/workflow_management/n8n-executions.js.map
+++ b/dist/mcp/tool-docs/workflow_management/n8n-executions.js.map
@@ -1 +1 @@
-{"version":3,"file":"n8n-executions.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/n8n-executions.ts"],"names":[],"mappings":";;;AAEa,QAAA,gBAAgB,GAAsB;IACjD,IAAI,EAAE,gBAAgB;IACtB,QAAQ,EAAE,qBAAqB;IAC/B,UAAU,EAAE;QACV,WAAW,EAAE,sGAAsG;QACnH,aAAa,EAAE,CAAC,QAAQ,EAAE,IAAI,EAAE,YAAY,EAAE,QAAQ,CAAC;QACvD,OAAO,EAAE,yEAAyE;QAClF,WAAW,EAAE,iBAAiB;QAC9B,IAAI,EAAE;YACJ,2CAA2C;YAC3C,6CAA6C;YAC7C,0CAA0C;YAC1C,2DAA2D;SAC5D;KACF;IACD,IAAI,EAAE;QACJ,WAAW,EAAE;;;;;;;;;+CAS8B;QAC3C,UAAU,EAAE;YACV,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,IAAI,EAAE,WAAW,EAAE,uCAAuC,EAAE;YAChG,EAAE,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,yDAAyD,EAAE;YAC/G,IAAI,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,oEAAoE,EAAE;YAC5H,SAAS,EAAE,EAAE,IAAI,EAAE,OAAO,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,qEAAqE,EAAE;YACjI,UAAU,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0FAA0F,EAAE;YACxJ,gBAAgB,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,2EAA2E,EAAE;YAChJ,UAAU,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,wCAAwC,EAAE;YACtG,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,mEAAmE,EAAE;YAC7H,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0DAA0D,EAAE;YACnH,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,2DAA2D,EAAE;YACrH,SAAS,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,oDAAoD,EAAE;YACjH,WAAW,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0DAA0D,EAAE;SAC3H;QACD,OAAO,EAAE;;;gDAGmC;QAC5C,QAAQ,EAAE;YACR,6GAA6G;YAC7G,8EAA8E;YAC9E,2EAA2E;YAC3E,2FAA2F;YAC3F,+IAA+I;YAC/I,4EAA4E;SAC7E;QACD,QAAQ,EAAE;YACR,8CAA8C;YAC9C,mDAAmD;YACnD,yBAAyB;YACzB,gCAAgC;YAChC,+BAA+B;SAChC;QACD,WAAW,EAAE;;;;kBAIC;QACd,aAAa,EAAE;YACb,gEAAgE;YAChE,wDAAwD;YACxD,qDAAqD;YACrD,qDAAqD;YACrD,uCAAuC;SACxC;QACD,QAAQ,EAAE;YACR,iDAAiD;YACjD,mEAAmE;YACnE,qCAAqC;YACrC,mCAAmC;SACpC;QACD,YAAY,EAAE,CAAC,kBAAkB,EAAE,mBAAmB,EAAE,uBAAuB,CAAC;KACjF;CACF,CAAC"}
+{"version":3,"file":"n8n-executions.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/n8n-executions.ts"],"names":[],"mappings":";;;AAEa,QAAA,gBAAgB,GAAsB;IACjD,IAAI,EAAE,gBAAgB;IACtB,QAAQ,EAAE,qBAAqB;IAC/B,UAAU,EAAE;QACV,WAAW,EAAE,sGAAsG;QACnH,aAAa,EAAE,CAAC,QAAQ,EAAE,IAAI,EAAE,YAAY,EAAE,QAAQ,EAAE,MAAM,CAAC;QAC/D,OAAO,EAAE,gEAAgE;QACzE,WAAW,EAAE,iBAAiB;QAC9B,IAAI,EAAE;YACJ,2CAA2C;YAC3C,6CAA6C;YAC7C,0CAA0C;YAC1C,yEAAyE;YACzE,2DAA2D;SAC5D;KACF;IACD,IAAI,EAAE;QACJ,WAAW,EAAE;;;;;;;;;;;;;;;;;kDAiBiC;QAC9C,UAAU,EAAE;YACV,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,IAAI,EAAE,WAAW,EAAE,uCAAuC,EAAE;YAChG,EAAE,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,yDAAyD,EAAE;YAC/G,IAAI,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,6EAA6E,EAAE;YACrI,SAAS,EAAE,EAAE,IAAI,EAAE,OAAO,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,qEAAqE,EAAE;YACjI,UAAU,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0FAA0F,EAAE;YACxJ,gBAAgB,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,2EAA2E,EAAE;YAChJ,eAAe,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,mFAAmF,EAAE;YACtJ,iBAAiB,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,4FAA4F,EAAE;YAClK,oBAAoB,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,wEAAwE,EAAE;YACjJ,aAAa,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,gGAAgG,EAAE;YAClK,UAAU,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,wCAAwC,EAAE;YACtG,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,mEAAmE,EAAE;YAC7H,KAAK,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0DAA0D,EAAE;YACnH,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,2DAA2D,EAAE;YACrH,SAAS,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,oDAAoD,EAAE;YACjH,WAAW,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,QAAQ,EAAE,KAAK,EAAE,WAAW,EAAE,0DAA0D,EAAE;SAC3H;QACD,OAAO,EAAE;;;;gDAImC;QAC5C,QAAQ,EAAE;YACR,sHAAsH;YACtH,kIAAkI;YAClI,yHAAyH;YACzH,kJAAkJ;YAClJ,6GAA6G;YAC7G,8EAA8E;YAC9E,2EAA2E;YAC3E,2FAA2F;YAC3F,+IAA+I;YAC/I,4EAA4E;SAC7E;QACD,QAAQ,EAAE;YACR,yEAAyE;YACzE,6CAA6C;YAC7C,wCAAwC;YACxC,oDAAoD;YACpD,mDAAmD;YACnD,yBAAyB;YACzB,gCAAgC;YAChC,+BAA+B;SAChC;QACD,WAAW,EAAE;;;;;kBAKC;QACd,aAAa,EAAE;YACb,iFAAiF;YACjF,mDAAmD;YACnD,wDAAwD;YACxD,qDAAqD;YACrD,qDAAqD;YACrD,oEAAoE;YACpE,uCAAuC;SACxC;QACD,QAAQ,EAAE;YACR,iDAAiD;YACjD,mEAAmE;YACnE,6FAA6F;YAC7F,qCAAqC;YACrC,mCAAmC;SACpC;QACD,YAAY,EAAE,CAAC,kBAAkB,EAAE,mBAAmB,EAAE,uBAAuB,CAAC;KACjF;CACF,CAAC"}
--- a/dist/mcp/tools-n8n-manager.d.ts.map
+++ b/dist/mcp/tools-n8n-manager.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"tools-n8n-manager.d.ts","sourceRoot":"","sources":["../../src/mcp/tools-n8n-manager.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,UAAU,CAAC;AAQ1C,eAAO,MAAM,kBAAkB,EAAE,cAAc,EAmf9C,CAAC"}
+{"version":3,"file":"tools-n8n-manager.d.ts","sourceRoot":"","sources":["../../src/mcp/tools-n8n-manager.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,UAAU,CAAC;AAQ1C,eAAO,MAAM,kBAAkB,EAAE,cAAc,EAogB9C,CAAC"}
--- a/dist/mcp/tools-n8n-manager.js
+++ b/dist/mcp/tools-n8n-manager.js
@@ -336,8 +336,8 @@ exports.n8nManagementTools = [
                },
                mode: {
                    type: 'string',
-                    enum: ['preview', 'summary', 'filtered', 'full'],
-                    description: 'For action=get: preview=structure only, summary=2 items (default), filtered=custom, full=all data'
+                    enum: ['preview', 'summary', 'filtered', 'full', 'error'],
+                    description: 'For action=get: preview=structure only, summary=2 items (default), filtered=custom, full=all data, error=optimized error debugging'
                },
                nodeNames: {
                    type: 'array',
@@ -352,6 +352,22 @@ exports.n8nManagementTools = [
                    type: 'boolean',
                    description: 'For action=get: include input data in addition to output (default: false)'
                },
+                errorItemsLimit: {
+                    type: 'number',
+                    description: 'For action=get with mode=error: sample items from upstream node (default: 2, max: 100)'
+                },
+                includeStackTrace: {
+                    type: 'boolean',
+                    description: 'For action=get with mode=error: include full stack trace (default: false, shows truncated)'
+                },
+                includeExecutionPath: {
+                    type: 'boolean',
+                    description: 'For action=get with mode=error: include execution path leading to error (default: true)'
+                },
+                fetchWorkflow: {
+                    type: 'boolean',
+                    description: 'For action=get with mode=error: fetch workflow for accurate upstream detection (default: true)'
+                },
                limit: {
                    type: 'number',
                    description: 'For action=list: number of executions to return (1-100, default: 100)'
--- a/dist/mcp/tools-n8n-manager.js.map
+++ b/dist/mcp/tools-n8n-manager.js.map
--- a/dist/services/execution-processor.d.ts
+++ b/dist/services/execution-processor.d.ts
@@ -1,8 +1,8 @@
-import { Execution, ExecutionPreview, ExecutionRecommendation, ExecutionFilterOptions, FilteredExecutionResponse } from '../types/n8n-api';
+import { Execution, ExecutionPreview, ExecutionRecommendation, ExecutionFilterOptions, FilteredExecutionResponse, Workflow } from '../types/n8n-api';
 export declare function generatePreview(execution: Execution): {
    preview: ExecutionPreview;
    recommendation: ExecutionRecommendation;
 };
-export declare function filterExecutionData(execution: Execution, options: ExecutionFilterOptions): FilteredExecutionResponse;
-export declare function processExecution(execution: Execution, options?: ExecutionFilterOptions): FilteredExecutionResponse | Execution;
+export declare function filterExecutionData(execution: Execution, options: ExecutionFilterOptions, workflow?: Workflow): FilteredExecutionResponse;
+export declare function processExecution(execution: Execution, options?: ExecutionFilterOptions, workflow?: Workflow): FilteredExecutionResponse | Execution;
 //# sourceMappingURL=execution-processor.d.ts.map
--- a/dist/services/execution-processor.d.ts.map
+++ b/dist/services/execution-processor.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"execution-processor.d.ts","sourceRoot":"","sources":["../../src/services/execution-processor.ts"],"names":[],"mappings":"AAaA,OAAO,EACL,SAAS,EAET,gBAAgB,EAEhB,uBAAuB,EACvB,sBAAsB,EACtB,yBAAyB,EAG1B,MAAM,kBAAkB,CAAC;AA+G1B,wBAAgB,eAAe,CAAC,SAAS,EAAE,SAAS,GAAG;IACrD,OAAO,EAAE,gBAAgB,CAAC;IAC1B,cAAc,EAAE,uBAAuB,CAAC;CACzC,CA2EA;AAoID,wBAAgB,mBAAmB,CACjC,SAAS,EAAE,SAAS,EACpB,OAAO,EAAE,sBAAsB,GAC9B,yBAAyB,CA2J3B;AAMD,wBAAgB,gBAAgB,CAC9B,SAAS,EAAE,SAAS,EACpB,OAAO,GAAE,sBAA2B,GACnC,yBAAyB,GAAG,SAAS,CAOvC"}
+{"version":3,"file":"execution-processor.d.ts","sourceRoot":"","sources":["../../src/services/execution-processor.ts"],"names":[],"mappings":"AAaA,OAAO,EACL,SAAS,EAET,gBAAgB,EAEhB,uBAAuB,EACvB,sBAAsB,EACtB,yBAAyB,EAGzB,QAAQ,EACT,MAAM,kBAAkB,CAAC;AAgH1B,wBAAgB,eAAe,CAAC,SAAS,EAAE,SAAS,GAAG;IACrD,OAAO,EAAE,gBAAgB,CAAC;IAC1B,cAAc,EAAE,uBAAuB,CAAC;CACzC,CA2EA;AAoID,wBAAgB,mBAAmB,CACjC,SAAS,EAAE,SAAS,EACpB,OAAO,EAAE,sBAAsB,EAC/B,QAAQ,CAAC,EAAE,QAAQ,GAClB,yBAAyB,CAsL3B;AAMD,wBAAgB,gBAAgB,CAC9B,SAAS,EAAE,SAAS,EACpB,OAAO,GAAE,sBAA2B,EACpC,QAAQ,CAAC,EAAE,QAAQ,GAClB,yBAAyB,GAAG,SAAS,CAOvC"}
--- a/dist/services/execution-processor.js
+++ b/dist/services/execution-processor.js
@@ -4,6 +4,7 @@ exports.generatePreview = generatePreview;
 exports.filterExecutionData = filterExecutionData;
 exports.processExecution = processExecution;
 const logger_1 = require("../utils/logger");
+const error_execution_processor_1 = require("./error-execution-processor");
 const THRESHOLDS = {
    CHAR_SIZE_BYTES: 2,
    OVERHEAD_PER_OBJECT: 50,
@@ -231,7 +232,7 @@ function truncateItems(items, limit) {
        },
    };
 }
-function filterExecutionData(execution, options) {
+function filterExecutionData(execution, options, workflow) {
    const mode = options.mode || 'summary';
    let itemsLimit = options.itemsLimit !== undefined ? options.itemsLimit : 2;
    if (itemsLimit !== -1) {
@@ -265,6 +266,27 @@ function filterExecutionData(execution, options) {
        response.recommendation = recommendation;
        return response;
    }
+    if (mode === 'error') {
+        const errorAnalysis = (0, error_execution_processor_1.processErrorExecution)(execution, {
+            itemsLimit: options.errorItemsLimit ?? 2,
+            includeStackTrace: options.includeStackTrace ?? false,
+            includeExecutionPath: options.includeExecutionPath !== false,
+            workflow
+        });
+        const runData = execution.data?.resultData?.runData || {};
+        const executedNodes = Object.keys(runData).length;
+        response.errorInfo = errorAnalysis;
+        response.summary = {
+            totalNodes: executedNodes,
+            executedNodes,
+            totalItems: 0,
+            hasMoreData: false
+        };
+        if (execution.data?.resultData?.error) {
+            response.error = execution.data.resultData.error;
+        }
+        return response;
+    }
    if (!execution.data?.resultData?.runData) {
        response.summary = {
            totalNodes: 0,
@@ -350,10 +372,10 @@ function filterExecutionData(execution, options) {
    }
    return response;
 }
-function processExecution(execution, options = {}) {
+function processExecution(execution, options = {}, workflow) {
    if (!options.mode && !options.nodeNames && options.itemsLimit === undefined) {
        return execution;
    }
-    return filterExecutionData(execution, options);
+    return filterExecutionData(execution, options, workflow);
 }
 //# sourceMappingURL=execution-processor.js.map
--- a/dist/services/execution-processor.js.map
+++ b/dist/services/execution-processor.js.map
--- a/dist/services/n8n-validation.d.ts.map
+++ b/dist/services/n8n-validation.d.ts.map
@@ -1 +1 @@
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--- a/dist/services/n8n-validation.js
+++ b/dist/services/n8n-validation.js
@@ -152,17 +152,23 @@ function validateWorkflowStructure(workflow) {
        }
        else if (connectionCount > 0 || executableNodes.length > 1) {
            const connectedNodes = new Set();
+            const ALL_CONNECTION_TYPES = ['main', 'error', 'ai_tool', 'ai_languageModel', 'ai_memory', 'ai_embedding', 'ai_vectorStore'];
            Object.entries(workflow.connections).forEach(([sourceName, connection]) => {
                connectedNodes.add(sourceName);
-                if (connection.main && Array.isArray(connection.main)) {
-                    connection.main.forEach((outputs) => {
-                        if (Array.isArray(outputs)) {
-                            outputs.forEach((target) => {
-                                connectedNodes.add(target.node);
-                            });
-                        }
-                    });
-                }
+                ALL_CONNECTION_TYPES.forEach(connType => {
+                    const connData = connection[connType];
+                    if (connData && Array.isArray(connData)) {
+                        connData.forEach((outputs) => {
+                            if (Array.isArray(outputs)) {
+                                outputs.forEach((target) => {
+                                    if (target?.node) {
+                                        connectedNodes.add(target.node);
+                                    }
+                                });
+                            }
+                        });
+                    }
+                });
            });
            const disconnectedNodes = workflow.nodes.filter(node => {
                if ((0, node_classification_1.isNonExecutableNode)(node.type)) {
@@ -171,7 +177,9 @@ function validateWorkflowStructure(workflow) {
                const isConnected = connectedNodes.has(node.name);
                const isNodeTrigger = (0, node_type_utils_1.isTriggerNode)(node.type);
                if (isNodeTrigger) {
-                    return !workflow.connections?.[node.name];
+                    const hasOutgoingConnections = !!workflow.connections?.[node.name];
+                    const hasInboundConnections = isConnected;
+                    return !hasOutgoingConnections && !hasInboundConnections;
                }
                return !isConnected;
            });
--- a/dist/services/n8n-validation.js.map
+++ b/dist/services/n8n-validation.js.map
--- a/dist/types/n8n-api.d.ts
+++ b/dist/types/n8n-api.d.ts
@@ -267,7 +267,7 @@ export interface McpToolResponse {
    executionId?: string;
    workflowId?: string;
 }
-export type ExecutionMode = 'preview' | 'summary' | 'filtered' | 'full';
+export type ExecutionMode = 'preview' | 'summary' | 'filtered' | 'full' | 'error';
 export interface ExecutionPreview {
    totalNodes: number;
    executedNodes: number;
@@ -296,6 +296,9 @@ export interface ExecutionFilterOptions {
    itemsLimit?: number;
    includeInputData?: boolean;
    fieldsToInclude?: string[];
+    errorItemsLimit?: number;
+    includeStackTrace?: boolean;
+    includeExecutionPath?: boolean;
 }
 export interface FilteredExecutionResponse {
    id: string;
@@ -316,6 +319,7 @@ export interface FilteredExecutionResponse {
    };
    nodes?: Record<string, FilteredNodeData>;
    error?: Record<string, unknown>;
+    errorInfo?: ErrorAnalysis;
 }
 export interface FilteredNodeData {
    executionTime?: number;
@@ -333,4 +337,39 @@ export interface FilteredNodeData {
        };
    };
 }
+export interface ErrorAnalysis {
+    primaryError: {
+        message: string;
+        errorType: string;
+        nodeName: string;
+        nodeType: string;
+        nodeId?: string;
+        nodeParameters?: Record<string, unknown>;
+        stackTrace?: string;
+    };
+    upstreamContext?: {
+        nodeName: string;
+        nodeType: string;
+        itemCount: number;
+        sampleItems: unknown[];
+        dataStructure: Record<string, unknown>;
+    };
+    executionPath?: Array<{
+        nodeName: string;
+        status: 'success' | 'error' | 'skipped';
+        itemCount: number;
+        executionTime?: number;
+    }>;
+    additionalErrors?: Array<{
+        nodeName: string;
+        message: string;
+    }>;
+    suggestions?: ErrorSuggestion[];
+}
+export interface ErrorSuggestion {
+    type: 'fix' | 'investigate' | 'workaround';
+    title: string;
+    description: string;
+    confidence: 'high' | 'medium' | 'low';
+}
 //# sourceMappingURL=n8n-api.d.ts.map
--- a/dist/types/n8n-api.d.ts.map
+++ b/dist/types/n8n-api.d.ts.map
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "n8n-mcp",
-  "version": "2.31.0",
+  "version": "2.31.3",
  "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
  "main": "dist/index.js",
  "types": "dist/index.d.ts",
@@ -141,16 +141,16 @@
  },
  "dependencies": {
    "@modelcontextprotocol/sdk": "1.20.1",
-    "@n8n/n8n-nodes-langchain": "^2.0.1",
+    "@n8n/n8n-nodes-langchain": "^2.1.3",
    "@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": "^2.0.2",
-    "n8n-core": "^2.0.1",
-    "n8n-workflow": "^2.0.1",
+    "n8n": "^2.1.4",
+    "n8n-core": "^2.1.3",
+    "n8n-workflow": "^2.1.1",
    "openai": "^4.77.0",
    "sql.js": "^1.13.0",
    "tslib": "^2.6.2",
--- a/src/mcp/tool-docs/templates/get-template.ts
+++ b/src/mcp/tool-docs/templates/get-template.ts
@@ -42,7 +42,7 @@ export const getTemplateDoc: ToolDocumentation = {
  - url: Link to template on n8n.io
  - workflow: Complete workflow JSON with structure:
    - nodes: Array of node objects (id, name, type, typeVersion, position, parameters)
-    - connections: Object mapping source nodes to targets
+    - connections: Object mapping source node names to targets
    - settings: Workflow configuration (timezone, error handling, etc.)
 - usage: Instructions for using the workflow`,
    examples: [
--- a/src/mcp/tool-docs/workflow_management/n8n-create-workflow.ts
+++ b/src/mcp/tool-docs/workflow_management/n8n-create-workflow.ts
@@ -20,7 +20,7 @@ export const n8nCreateWorkflowDoc: ToolDocumentation = {
    parameters: {
      name: { type: 'string', required: true, description: 'Workflow name' },
      nodes: { type: 'array', required: true, description: 'Array of nodes with id, name, type, typeVersion, position, parameters' },
-      connections: { type: 'object', required: true, description: 'Node connections. Keys are source node IDs' },
+      connections: { type: 'object', required: true, description: 'Node connections. Keys are source node names (not IDs)' },
      settings: { type: 'object', description: 'Optional workflow settings (timezone, error handling, etc.)' }
    },
    returns: 'Minimal summary (id, name, active, nodeCount) for token efficiency. Use n8n_get_workflow with mode "structure" to verify current state if needed.',
@@ -55,8 +55,8 @@ n8n_create_workflow({
    }
  ],
  connections: {
-    "webhook_1": {
-      "main": [[{node: "slack_1", type: "main", index: 0}]]
+    "Webhook": {
+      "main": [[{node: "Slack", type: "main", index: 0}]]
    }
  }
 })`,
--- a/src/mcp/tools-n8n-manager.ts
+++ b/src/mcp/tools-n8n-manager.ts
@@ -46,9 +46,9 @@ export const n8nManagementTools: ToolDefinition[] = [
            }
          }
        },
-        connections: { 
-          type: 'object', 
-          description: 'Workflow connections object. Keys are source node IDs, values define output connections' 
+        connections: {
+          type: 'object',
+          description: 'Workflow connections object. Keys are source node names (the name field, not id), values define output connections'
        },
        settings: {
          type: 'object',
--- a/src/services/n8n-validation.ts
+++ b/src/services/n8n-validation.ts
@@ -248,23 +248,32 @@ export function validateWorkflowStructure(workflow: Partial<Workflow>): string[]
      const connectedNodes = new Set<string>();

      // Collect all nodes that appear in connections (as source or target)
+      // Check ALL connection types, not just 'main' - AI workflows use ai_tool, ai_languageModel, etc.
+      const ALL_CONNECTION_TYPES = ['main', 'error', 'ai_tool', 'ai_languageModel', 'ai_memory', 'ai_embedding', 'ai_vectorStore'] as const;
+
      Object.entries(workflow.connections).forEach(([sourceName, connection]) => {
        connectedNodes.add(sourceName); // Node has outgoing connection

-        if (connection.main && Array.isArray(connection.main)) {
-          connection.main.forEach((outputs) => {
-            if (Array.isArray(outputs)) {
-              outputs.forEach((target) => {
-                connectedNodes.add(target.node); // Node has incoming connection
-              });
-            }
-          });
-        }
+        // Check all connection types for target nodes
+        ALL_CONNECTION_TYPES.forEach(connType => {
+          const connData = (connection as Record<string, unknown>)[connType];
+          if (connData && Array.isArray(connData)) {
+            connData.forEach((outputs) => {
+              if (Array.isArray(outputs)) {
+                outputs.forEach((target: { node: string }) => {
+                  if (target?.node) {
+                    connectedNodes.add(target.node); // Node has incoming connection
+                  }
+                });
+              }
+            });
+          }
+        });
      });

      // Find disconnected nodes (excluding non-executable nodes and triggers)
      // Non-executable nodes (sticky notes) are UI-only and don't need connections
-      // Trigger nodes only need outgoing connections
+      // Trigger nodes need either outgoing connections OR inbound AI connections (for mcpTrigger)
      const disconnectedNodes = workflow.nodes.filter(node => {
        // Skip non-executable nodes (sticky notes, etc.) - they're UI-only annotations
        if (isNonExecutableNode(node.type)) {
@@ -274,9 +283,12 @@ export function validateWorkflowStructure(workflow: Partial<Workflow>): string[]
        const isConnected = connectedNodes.has(node.name);
        const isNodeTrigger = isTriggerNode(node.type);

-        // Trigger nodes only need outgoing connections
+        // Trigger nodes need outgoing connections OR inbound connections (for mcpTrigger)
+        // mcpTrigger is special: it has "trigger" in its name but only receives inbound ai_tool connections
        if (isNodeTrigger) {
-          return !workflow.connections?.[node.name]; // Disconnected if no outgoing connections
+          const hasOutgoingConnections = !!workflow.connections?.[node.name];
+          const hasInboundConnections = isConnected;
+          return !hasOutgoingConnections && !hasInboundConnections; // Disconnected if NEITHER
        }

        // Regular nodes need at least one connection (incoming or outgoing)
--- a/tests/unit/services/n8n-validation.test.ts
+++ b/tests/unit/services/n8n-validation.test.ts
@@ -884,6 +884,260 @@ describe('n8n-validation', () => {
      const errors = validateWorkflowStructure(workflow);
      expect(errors.some(e => e.includes('Invalid connections'))).toBe(true);
    });
+
+    // Issue #503: mcpTrigger nodes should not be flagged as disconnected
+    describe('AI connection types (Issue #503)', () => {
+      it('should NOT flag mcpTrigger as disconnected when it has ai_tool inbound connections', () => {
+        const workflow = {
+          name: 'MCP Server Workflow',
+          nodes: [
+            {
+              id: 'mcp-server',
+              name: 'MCP Server',
+              type: '@n8n/n8n-nodes-langchain.mcpTrigger',
+              typeVersion: 1,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'tool-1',
+              name: 'Get Weather Tool',
+              type: '@n8n/n8n-nodes-langchain.toolWorkflow',
+              typeVersion: 1.3,
+              position: [300, 200] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'tool-2',
+              name: 'Search Tool',
+              type: '@n8n/n8n-nodes-langchain.toolWorkflow',
+              typeVersion: 1.3,
+              position: [300, 400] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'Get Weather Tool': {
+              ai_tool: [[{ node: 'MCP Server', type: 'ai_tool', index: 0 }]],
+            },
+            'Search Tool': {
+              ai_tool: [[{ node: 'MCP Server', type: 'ai_tool', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should NOT flag nodes as disconnected when connected via ai_languageModel', () => {
+        const workflow = {
+          name: 'AI Agent Workflow',
+          nodes: [
+            {
+              id: 'agent-1',
+              name: 'AI Agent',
+              type: '@n8n/n8n-nodes-langchain.agent',
+              typeVersion: 1.6,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'llm-1',
+              name: 'OpenAI Model',
+              type: '@n8n/n8n-nodes-langchain.lmChatOpenAi',
+              typeVersion: 1,
+              position: [300, 300] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'OpenAI Model': {
+              ai_languageModel: [[{ node: 'AI Agent', type: 'ai_languageModel', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should NOT flag nodes as disconnected when connected via ai_memory', () => {
+        const workflow = {
+          name: 'AI Memory Workflow',
+          nodes: [
+            {
+              id: 'agent-1',
+              name: 'AI Agent',
+              type: '@n8n/n8n-nodes-langchain.agent',
+              typeVersion: 1.6,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'memory-1',
+              name: 'Buffer Memory',
+              type: '@n8n/n8n-nodes-langchain.memoryBufferWindow',
+              typeVersion: 1,
+              position: [300, 400] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'Buffer Memory': {
+              ai_memory: [[{ node: 'AI Agent', type: 'ai_memory', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should NOT flag nodes as disconnected when connected via ai_embedding', () => {
+        const workflow = {
+          name: 'Vector Store Workflow',
+          nodes: [
+            {
+              id: 'vs-1',
+              name: 'Vector Store',
+              type: '@n8n/n8n-nodes-langchain.vectorStorePinecone',
+              typeVersion: 1,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'embed-1',
+              name: 'OpenAI Embeddings',
+              type: '@n8n/n8n-nodes-langchain.embeddingsOpenAi',
+              typeVersion: 1,
+              position: [300, 300] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'OpenAI Embeddings': {
+              ai_embedding: [[{ node: 'Vector Store', type: 'ai_embedding', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should NOT flag nodes as disconnected when connected via ai_vectorStore', () => {
+        const workflow = {
+          name: 'Retriever Workflow',
+          nodes: [
+            {
+              id: 'retriever-1',
+              name: 'Vector Store Retriever',
+              type: '@n8n/n8n-nodes-langchain.retrieverVectorStore',
+              typeVersion: 1,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'vs-1',
+              name: 'Pinecone Store',
+              type: '@n8n/n8n-nodes-langchain.vectorStorePinecone',
+              typeVersion: 1,
+              position: [300, 300] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'Pinecone Store': {
+              ai_vectorStore: [[{ node: 'Vector Store Retriever', type: 'ai_vectorStore', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should NOT flag nodes as disconnected when connected via error output', () => {
+        const workflow = {
+          name: 'Error Handling Workflow',
+          nodes: [
+            {
+              id: 'http-1',
+              name: 'HTTP Request',
+              type: 'n8n-nodes-base.httpRequest',
+              typeVersion: 4.2,
+              position: [300, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'set-1',
+              name: 'Handle Error',
+              type: 'n8n-nodes-base.set',
+              typeVersion: 3.4,
+              position: [500, 400] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'HTTP Request': {
+              error: [[{ node: 'Handle Error', type: 'error', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors).toHaveLength(0);
+      });
+
+      it('should still flag truly disconnected nodes in AI workflows', () => {
+        const workflow = {
+          name: 'AI Workflow with Disconnected Node',
+          nodes: [
+            {
+              id: 'agent-1',
+              name: 'AI Agent',
+              type: '@n8n/n8n-nodes-langchain.agent',
+              typeVersion: 1.6,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'llm-1',
+              name: 'OpenAI Model',
+              type: '@n8n/n8n-nodes-langchain.lmChatOpenAi',
+              typeVersion: 1,
+              position: [300, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'disconnected-1',
+              name: 'Disconnected Set',
+              type: 'n8n-nodes-base.set',
+              typeVersion: 3.4,
+              position: [700, 300] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'OpenAI Model': {
+              ai_languageModel: [[{ node: 'AI Agent', type: 'ai_languageModel', index: 0 }]],
+            },
+          },
+        };
+
+        const errors = validateWorkflowStructure(workflow);
+        const disconnectedErrors = errors.filter(e => e.includes('Disconnected'));
+        expect(disconnectedErrors.length).toBeGreaterThan(0);
+        expect(disconnectedErrors[0]).toContain('Disconnected Set');
+      });
+    });
  });

  describe('hasWebhookTrigger', () => {