fix: field normalization, AI connection validation, autofix filter (#581 ) (#638 )

- Normalize name→nodeName and id→nodeId for node-targeting operations in the Zod schema transform, so LLMs using natural field names no longer get "Node not found" errors - Replace hardcoded ALL_CONNECTION_TYPES with dynamic iteration so AI sub-nodes (ai_outputParser, ai_document, ai_textSplitter, etc.) are not flagged as disconnected during save - Add .catchall() to workflowConnectionSchema and extend connection reference validation to cover all connection types, not just main - Fix filterOperationsByFixes ID-vs-name mismatch: typeversion-upgrade operations now include nodeName alongside nodeId, and the filter checks both fields Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
fix: code validator false positives and null property removal (#294 , #293 , #611 ) (#637 )
2026-03-17 16:03:08 +00:00 · 2026-03-15 14:32:14 +01:00 · 2026-03-15 11:26:44 +01:00
55 changed files with 995 additions and 242 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [Unreleased]

+## [2.37.3] - 2026-03-15
+
+### Fixed
+
+- **updateNode `name`/`id` field normalization**: LLMs sending `{type: "updateNode", name: "Code", ...}` instead of `nodeName` no longer get "Node not found" errors. The Zod schema now normalizes `name` → `nodeName` and `id` → `nodeId` for node-targeting operations (updateNode, removeNode, moveNode, enableNode, disableNode)
+- **AI connection types in disconnected-node detection** (Issue #581): Replaced hardcoded 7-type list with dynamic iteration over all connection types present in workflow data. Nodes connected via `ai_outputParser`, `ai_document`, `ai_textSplitter`, `ai_agent`, `ai_chain`, `ai_retriever` are no longer falsely flagged as disconnected during save
+- **Connection schema and reference validation** (Issue #581): Added `.catchall()` to `workflowConnectionSchema` for unknown AI connection types, and extended connection reference validation to check all connection types (not just `main`)
+- **autofix `filterOperationsByFixes` ID-vs-name mismatch**: Typeversion-upgrade operations now include `nodeName` alongside `nodeId`, and the filter checks both fields. Previously, `applyFixes=true` silently dropped all typeversion fixes because `fixedNodes` contained names but the filter only checked `nodeId` (UUID)
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
+## [2.37.2] - 2026-03-15
+
+### Fixed
+
+- **Code validator `$()` false positive** (Issue #294): `$('Previous Node').first().json` no longer triggers "Invalid $ usage detected" warning. Added `(` and `_` to the regex negative lookahead to support standard n8n cross-node references and valid JS identifiers like `$_var`
+- **Code validator helper function return false positive** (Issue #293): `function isValid(item) { return false; }` no longer triggers "Cannot return primitive values directly" error. Added helper function detection to skip primitive return checks when named functions or arrow function assignments are present
+- **Null property removal in diff engine** (Issue #611): `{continueOnFail: null}` no longer causes Zod validation error "Expected boolean, received null". The diff engine now treats `null` values as property deletion (`delete` operator), and documentation updated from `undefined` to `null` for property removal
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
 ## [2.37.1] - 2026-03-14

 ### Fixed
--- 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;AA2HD,wBAAsB,oBAAoB,CAAC,IAAI,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,eAAe,GAAG,OAAO,CAAC,eAAe,CAAC,CA8F7G;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
@@ -288,6 +288,15 @@ async function handleCreateWorkflow(args, context) {
            };
        }
        const workflow = await client.createWorkflow(input);
+        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
+                }
+            };
+        }
        telemetry_1.telemetry.trackWorkflowCreation(workflow, true);
        return {
            success: true,
--- a/dist/mcp/handlers-n8n-manager.js.map
+++ b/dist/mcp/handlers-n8n-manager.js.map
--- a/dist/mcp/handlers-workflow-diff.d.ts.map
+++ b/dist/mcp/handlers-workflow-diff.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"handlers-workflow-diff.d.ts","sourceRoot":"","sources":["../../src/mcp/handlers-workflow-diff.ts"],"names":[],"mappings":"AAMA,OAAO,EAAE,eAAe,EAAE,MAAM,kBAAkB,CAAC;AAMnD,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,cAAc,EAAE,MAAM,6BAA6B,CAAC;AA0D7D,wBAAsB,2BAA2B,CAC/C,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CA6V1B"}
+{"version":3,"file":"handlers-workflow-diff.d.ts","sourceRoot":"","sources":["../../src/mcp/handlers-workflow-diff.ts"],"names":[],"mappings":"AAMA,OAAO,EAAE,eAAe,EAAE,MAAM,kBAAkB,CAAC;AAMnD,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,cAAc,EAAE,MAAM,6BAA6B,CAAC;AAgF7D,wBAAsB,2BAA2B,CAC/C,IAAI,EAAE,OAAO,EACb,UAAU,EAAE,cAAc,EAC1B,OAAO,CAAC,EAAE,eAAe,GACxB,OAAO,CAAC,eAAe,CAAC,CA6Z1B"}
--- a/dist/mcp/handlers-workflow-diff.js
+++ b/dist/mcp/handlers-workflow-diff.js
@@ -50,6 +50,9 @@ function getValidator(repository) {
    }
    return cachedValidator;
 }
+const NODE_TARGETING_OPERATIONS = new Set([
+    'updateNode', 'removeNode', 'moveNode', 'enableNode', 'disableNode'
+]);
 const workflowDiffSchema = zod_1.z.object({
    id: zod_1.z.string(),
    operations: zod_1.z.array(zod_1.z.object({
@@ -64,8 +67,8 @@ const workflowDiffSchema = zod_1.z.object({
        target: zod_1.z.string().optional(),
        from: zod_1.z.string().optional(),
        to: zod_1.z.string().optional(),
-        sourceOutput: zod_1.z.string().optional(),
-        targetInput: zod_1.z.string().optional(),
+        sourceOutput: zod_1.z.union([zod_1.z.string(), zod_1.z.number()]).transform(String).optional(),
+        targetInput: zod_1.z.union([zod_1.z.string(), zod_1.z.number()]).transform(String).optional(),
        sourceIndex: zod_1.z.number().optional(),
        targetIndex: zod_1.z.number().optional(),
        branch: zod_1.z.enum(['true', 'false']).optional(),
@@ -76,6 +79,19 @@ const workflowDiffSchema = zod_1.z.object({
        settings: zod_1.z.any().optional(),
        name: zod_1.z.string().optional(),
        tag: zod_1.z.string().optional(),
+        id: zod_1.z.string().optional(),
+    }).transform((op) => {
+        if (NODE_TARGETING_OPERATIONS.has(op.type)) {
+            if (!op.nodeName && !op.nodeId && op.name) {
+                op.nodeName = op.name;
+                op.name = undefined;
+            }
+            if (!op.nodeId && op.id) {
+                op.nodeId = op.id;
+                op.id = undefined;
+            }
+        }
+        return op;
    })),
    validateOnly: zod_1.z.boolean().optional(),
    continueOnError: zod_1.z.boolean().optional(),
@@ -167,11 +183,12 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
            else {
                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
                    }
@@ -239,6 +256,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
                if (!skipValidation) {
                    return {
                        success: false,
+                        saved: false,
                        error: errorMessage,
                        details: {
                            errors: structureErrors,
@@ -247,7 +265,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
                            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.'
                        }
                    };
                }
@@ -259,6 +277,58 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
        }
        try {
            const updatedWorkflow = await client.updateWorkflow(input.id, diffResult.workflow);
+            let tagWarnings = [];
+            if (diffResult.tagsToAdd?.length || diffResult.tagsToRemove?.length) {
+                try {
+                    const existingTags = Array.isArray(updatedWorkflow.tags)
+                        ? updatedWorkflow.tags.map((t) => typeof t === 'object' ? { id: t.id, name: t.name } : { id: '', name: t })
+                        : [];
+                    const allTags = await client.listTags();
+                    const tagMap = new Map();
+                    for (const t of allTags.data) {
+                        if (t.id)
+                            tagMap.set(t.name.toLowerCase(), t.id);
+                    }
+                    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'}`);
+                            }
+                        }
+                    }
+                    const currentTagIds = new Set();
+                    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);
+                    }
+                    await client.updateWorkflowTags(input.id, Array.from(currentTagIds));
+                }
+                catch (tagError) {
+                    tagWarnings.push(`Tag update failed: ${tagError instanceof Error ? tagError.message : 'Unknown error'}`);
+                    logger_1.logger.warn('Tag operations failed (non-blocking)', tagError);
+                }
+            }
            let finalWorkflow = updatedWorkflow;
            let activationMessage = '';
            try {
@@ -286,6 +356,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
                    logger_1.logger.error('Failed to activate workflow after update', activationError);
                    return {
                        success: false,
+                        saved: true,
                        error: 'Workflow updated successfully but activation failed',
                        details: {
                            workflowUpdated: true,
@@ -303,6 +374,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
                    logger_1.logger.error('Failed to deactivate workflow after update', deactivationError);
                    return {
                        success: false,
+                        saved: true,
                        error: 'Workflow updated successfully but deactivation failed',
                        details: {
                            workflowUpdated: true,
@@ -329,6 +401,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
            }
            return {
                success: true,
+                saved: true,
                data: {
                    id: finalWorkflow.id,
                    name: finalWorkflow.name,
@@ -341,7 +414,7 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
                    applied: diffResult.applied,
                    failed: diffResult.failed,
                    errors: diffResult.errors,
-                    warnings: diffResult.warnings
+                    warnings: mergeWarnings(diffResult.warnings, tagWarnings)
                }
            };
        }
@@ -379,7 +452,9 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
            return {
                success: false,
                error: 'Invalid input',
-                details: { errors: error.errors }
+                details: {
+                    errors: error.errors.map(e => `${e.path.join('.')}: ${e.message}`)
+                }
            };
        }
        logger_1.logger.error('Failed to update partial workflow', error);
@@ -389,6 +464,13 @@ async function handleUpdatePartialWorkflow(args, repository, context) {
        };
    }
 }
+function mergeWarnings(diffWarnings, tagWarnings) {
+    const merged = [
+        ...(diffWarnings || []),
+        ...tagWarnings.map(w => ({ operation: -1, message: w }))
+    ];
+    return merged.length > 0 ? merged : undefined;
+}
 function inferIntentFromOperations(operations) {
    if (!operations || operations.length === 0) {
        return 'Partial workflow update';
--- a/dist/mcp/handlers-workflow-diff.js.map
+++ b/dist/mcp/handlers-workflow-diff.js.map
--- a/dist/mcp/server.d.ts.map
+++ b/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;IA8GvE,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"}
--- a/dist/mcp/server.js
+++ b/dist/mcp/server.js
@@ -124,6 +124,7 @@ class N8NDocumentationMCPServer {
                this.earlyLogger.logCheckpoint(startup_checkpoints_1.STARTUP_CHECKPOINTS.N8N_API_READY);
            }
        });
+        this.initialized.catch(() => { });
        logger_1.logger.info('Initializing n8n Documentation MCP server');
        this.server = new index_js_1.Server({
            name: 'n8n-documentation-mcp',
--- a/dist/mcp/server.js.map
+++ b/dist/mcp/server.js.map
--- a/dist/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.js
+++ b/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'
--- a/dist/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.js.map
+++ b/dist/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.js.map
@@ -1 +1 @@
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+{"version":3,"file":"n8n-update-partial-workflow.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.ts"],"names":[],"mappings":";;;AAEa,QAAA,2BAA2B,GAAsB;IAC5D,IAAI,EAAE,6BAA6B;IACnC,QAAQ,EAAE,qBAAqB;IAC/B,UAAU,EAAE;QACV,WAAW,EAAE,ggBAAggB;QAC7gB,aAAa,EAAE,CAAC,IAAI,EAAE,YAAY,EAAE,iBAAiB,CAAC;QACtD,OAAO,EAAE,6IAA6I;QACtJ,WAAW,EAAE,iBAAiB;QAC9B,IAAI,EAAE;YACJ,gJAAgJ;YAChJ,oGAAoG;YACpG,mDAAmD;YACnD,wCAAwC;YACxC,6BAA6B;YAC7B,6DAA6D;YAC7D,uDAAuD;YACvD,0DAA0D;YAC1D,kCAAkC;YAClC,iFAAiF;YACjF,mDAAmD;YACnD,gGAAgG;YAChG,sGAAsG;YACtG,yIAAyI;SAC1I;KACF;IACD,IAAI,EAAE;QACJ,WAAW,EAAE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;iCAkRgB;QAC7B,UAAU,EAAE;YACV,EAAE,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,QAAQ,EAAE,IAAI,EAAE,WAAW,EAAE,uBAAuB,EAAE;YAC5E,UAAU,EAAE;gBACV,IAAI,EAAE,OAAO;gBACb,QAAQ,EAAE,IAAI;gBACd,WAAW,EAAE,iIAAiI;aAC/I;YACD,YAAY,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,WAAW,EAAE,yDAAyD,EAAE;YACzG,eAAe,EAAE,EAAE,IAAI,EAAE,SAAS,EAAE,WAAW,EAAE,6IAA6I,EAAE;YAChM,MAAM,EAAE,EAAE,IAAI,EAAE,QAAQ,EAAE,WAAW,EAAE,qIAAqI,EAAE;SAC/K;QACD,OAAO,EAAE,uNAAuN;QAChO,QAAQ,EAAE;YACR,mOAAmO;YACnO,wNAAwN;YACxN,kTAAkT;YAClT,0VAA0V;YAC1V,gMAAgM;YAChM,mLAAmL;YACnL,mLAAmL;YACnL,6UAA6U;YAC7U,oMAAoM;YACpM,oYAAoY;YACpY,qJAAqJ;YACrJ,+MAA+M;YAC/M,kSAAkS;YAClS,0LAA0L;YAC1L,wJAAwJ;YACxJ,uDAAuD;YACvD,2MAA2M;YAC3M,wLAAwL;YACxL,+LAA+L;YAC/L,gNAAgN;YAChN,4hBAA4hB;YAC5hB,+WAA+W;YAC/W,qWAAqW;YACrW,uVAAuV;YACvV,qPAAqP;YACrP,0eAA0e;YAC1e,6DAA6D;YAC7D,+JAA+J;YAC/J,+NAA+N;YAC/N,gLAAgL;YAChL,oOAAoO;YACpO,gLAAgL;SACjL;QACD,QAAQ,EAAE;YACR,yCAAyC;YACzC,uDAAuD;YACvD,wDAAwD;YACxD,+CAA+C;YAC/C,+BAA+B;YAC/B,iCAAiC;YACjC,8CAA8C;YAC9C,sBAAsB;YACtB,2BAA2B;YAC3B,yBAAyB;YACzB,iEAAiE;YACjE,+CAA+C;YAC/C,2CAA2C;YAC3C,0CAA0C;YAC1C,+CAA+C;YAC/C,kCAAkC;SACnC;QACD,WAAW,EAAE,8FAA8F;QAC3G,aAAa,EAAE;YACb,kPAAkP;YAClP,iEAAiE;YACjE,+DAA+D;YAC/D,oDAAoD;YACpD,yDAAyD;YACzD,iDAAiD;YACjD,gEAAgE;YAChE,qDAAqD;YACrD,mCAAmC;YACnC,wCAAwC;YACxC,gDAAgD;YAChD,8FAA8F;YAC9F,2EAA2E;YAC3E,6DAA6D;YAC7D,oEAAoE;YACpE,8EAA8E;YAC9E,8DAA8D;YAC9D,8GAA8G;YAC9G,6EAA6E;YAC7E,kFAAkF;SACnF;QACD,QAAQ,EAAE;YACR,uGAAuG;YACvG,wEAAwE;YACxE,6DAA6D;YAC7D,sFAAsF;YACtF,4DAA4D;YAC5D,yEAAyE;YACzE,yFAAyF;YACzF,wFAAwF;YACxF,mGAAmG;YACnG,iFAAiF;YACjF,iNAAiN;YACjN,kKAAkK;YAClK,4EAA4E;YAC5E,yFAAyF;YACzF,4LAA4L;YAC5L,oIAAoI;YACpI,wJAAwJ;YACxJ,+JAA+J;YAC/J,4DAA4D;YAC5D,4JAA4J;YAC5J,2FAA2F;YAC3F,gHAAgH;YAChH,kHAAkH;SACnH;QACD,YAAY,EAAE,CAAC,0BAA0B,EAAE,kBAAkB,EAAE,mBAAmB,EAAE,qBAAqB,CAAC;KAC3G;CACF,CAAC"}
--- a/dist/services/ai-tool-validators.d.ts
+++ b/dist/services/ai-tool-validators.d.ts
@@ -33,8 +33,8 @@ export declare function validateVectorStoreTool(node: WorkflowNode, reverseConne
 export declare function validateWorkflowTool(node: WorkflowNode, reverseConnections?: Map<string, ReverseConnection[]>): ValidationIssue[];
 export declare function validateAIAgentTool(node: WorkflowNode, reverseConnections: Map<string, ReverseConnection[]>): ValidationIssue[];
 export declare function validateMCPClientTool(node: WorkflowNode): ValidationIssue[];
-export declare function validateCalculatorTool(node: WorkflowNode): ValidationIssue[];
-export declare function validateThinkTool(node: WorkflowNode): ValidationIssue[];
+export declare function validateCalculatorTool(_node: WorkflowNode): ValidationIssue[];
+export declare function validateThinkTool(_node: WorkflowNode): ValidationIssue[];
 export declare function validateSerpApiTool(node: WorkflowNode): ValidationIssue[];
 export declare function validateWikipediaTool(node: WorkflowNode): ValidationIssue[];
 export declare function validateSearXngTool(node: WorkflowNode): ValidationIssue[];
--- a/dist/services/ai-tool-validators.d.ts.map
+++ b/dist/services/ai-tool-validators.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"ai-tool-validators.d.ts","sourceRoot":"","sources":["../../src/services/ai-tool-validators.ts"],"names":[],"mappings":"AAmBA,MAAM,WAAW,YAAY;IAC3B,EAAE,EAAE,MAAM,CAAC;IACX,IAAI,EAAE,MAAM,CAAC;IACb,IAAI,EAAE,MAAM,CAAC;IACb,QAAQ,EAAE,CAAC,MAAM,EAAE,MAAM,CAAC,CAAC;IAC3B,UAAU,EAAE,GAAG,CAAC;IAChB,WAAW,CAAC,EAAE,GAAG,CAAC;IAClB,QAAQ,CAAC,EAAE,OAAO,CAAC;IACnB,WAAW,CAAC,EAAE,MAAM,CAAC;CACtB;AAED,MAAM,WAAW,YAAY;IAC3B,IAAI,CAAC,EAAE,MAAM,CAAC;IACd,KAAK,EAAE,YAAY,EAAE,CAAC;IACtB,WAAW,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;IACjC,QAAQ,CAAC,EAAE,GAAG,CAAC;CAChB;AAED,MAAM,WAAW,iBAAiB;IAChC,UAAU,EAAE,MAAM,CAAC;IACnB,UAAU,EAAE,MAAM,CAAC;IACnB,IAAI,EAAE,MAAM,CAAC;IACb,KAAK,EAAE,MAAM,CAAC;CACf;AAED,MAAM,WAAW,eAAe;IAC9B,QAAQ,EAAE,OAAO,GAAG,SAAS,GAAG,MAAM,CAAC;IACvC,MAAM,CAAC,EAAE,MAAM,CAAC;IAChB,QAAQ,CAAC,EAAE,MAAM,CAAC;IAClB,OAAO,EAAE,MAAM,CAAC;IAChB,IAAI,CAAC,EAAE,MAAM,CAAC;CACf;AAMD,wBAAgB,uBAAuB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAuJ7E;AAMD,wBAAgB,gBAAgB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAoCtE;AAMD,wBAAgB,uBAAuB,CACrC,IAAI,EAAE,YAAY,EAClB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,EACpD,QAAQ,EAAE,YAAY,GACrB,eAAe,EAAE,CAmCnB;AAMD,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,YAAY,EAAE,kBAAkB,CAAC,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,GAAG,eAAe,EAAE,CA0BjI;AAMD,wBAAgB,mBAAmB,CACjC,IAAI,EAAE,YAAY,EAClB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,GACnD,eAAe,EAAE,CAmCnB;AAMD,wBAAgB,qBAAqB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA0B3E;AAMD,wBAAgB,sBAAsB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAM5E;AAED,wBAAgB,iBAAiB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAMvE;AAMD,wBAAgB,mBAAmB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAyBzE;AAED,wBAAgB,qBAAqB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA4B3E;AAED,wBAAgB,mBAAmB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA0BzE;AAED,wBAAgB,wBAAwB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAyB9E;AAKD,eAAO,MAAM,kBAAkB;;;;;;;;;;;;;CAarB,CAAC;AAKX,wBAAgB,eAAe,CAAC,QAAQ,EAAE,MAAM,GAAG,OAAO,CAGzD;AAKD,wBAAgB,qBAAqB,CACnC,IAAI,EAAE,YAAY,EAClB,QAAQ,EAAE,MAAM,EAChB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,EACpD,QAAQ,EAAE,YAAY,GACrB,eAAe,EAAE,CAgCnB"}
+{"version":3,"file":"ai-tool-validators.d.ts","sourceRoot":"","sources":["../../src/services/ai-tool-validators.ts"],"names":[],"mappings":"AAmBA,MAAM,WAAW,YAAY;IAC3B,EAAE,EAAE,MAAM,CAAC;IACX,IAAI,EAAE,MAAM,CAAC;IACb,IAAI,EAAE,MAAM,CAAC;IACb,QAAQ,EAAE,CAAC,MAAM,EAAE,MAAM,CAAC,CAAC;IAC3B,UAAU,EAAE,GAAG,CAAC;IAChB,WAAW,CAAC,EAAE,GAAG,CAAC;IAClB,QAAQ,CAAC,EAAE,OAAO,CAAC;IACnB,WAAW,CAAC,EAAE,MAAM,CAAC;CACtB;AAiBD,MAAM,WAAW,YAAY;IAC3B,IAAI,CAAC,EAAE,MAAM,CAAC;IACd,KAAK,EAAE,YAAY,EAAE,CAAC;IACtB,WAAW,EAAE,MAAM,CAAC,MAAM,EAAE,GAAG,CAAC,CAAC;IACjC,QAAQ,CAAC,EAAE,GAAG,CAAC;CAChB;AAED,MAAM,WAAW,iBAAiB;IAChC,UAAU,EAAE,MAAM,CAAC;IACnB,UAAU,EAAE,MAAM,CAAC;IACnB,IAAI,EAAE,MAAM,CAAC;IACb,KAAK,EAAE,MAAM,CAAC;CACf;AAED,MAAM,WAAW,eAAe;IAC9B,QAAQ,EAAE,OAAO,GAAG,SAAS,GAAG,MAAM,CAAC;IACvC,MAAM,CAAC,EAAE,MAAM,CAAC;IAChB,QAAQ,CAAC,EAAE,MAAM,CAAC;IAClB,OAAO,EAAE,MAAM,CAAC;IAChB,IAAI,CAAC,EAAE,MAAM,CAAC;CACf;AAMD,wBAAgB,uBAAuB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAuJ7E;AAMD,wBAAgB,gBAAgB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAoCtE;AAMD,wBAAgB,uBAAuB,CACrC,IAAI,EAAE,YAAY,EAClB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,EACpD,QAAQ,EAAE,YAAY,GACrB,eAAe,EAAE,CAmCnB;AAMD,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,YAAY,EAAE,kBAAkB,CAAC,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,GAAG,eAAe,EAAE,CA0BjI;AAMD,wBAAgB,mBAAmB,CACjC,IAAI,EAAE,YAAY,EAClB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,GACnD,eAAe,EAAE,CAmCnB;AAMD,wBAAgB,qBAAqB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA0B3E;AAMD,wBAAgB,sBAAsB,CAAC,KAAK,EAAE,YAAY,GAAG,eAAe,EAAE,CAG7E;AAED,wBAAgB,iBAAiB,CAAC,KAAK,EAAE,YAAY,GAAG,eAAe,EAAE,CAGxE;AAMD,wBAAgB,mBAAmB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAyBzE;AAED,wBAAgB,qBAAqB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA4B3E;AAED,wBAAgB,mBAAmB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CA0BzE;AAED,wBAAgB,wBAAwB,CAAC,IAAI,EAAE,YAAY,GAAG,eAAe,EAAE,CAyB9E;AAKD,eAAO,MAAM,kBAAkB;;;;;;;;;;;;;CAarB,CAAC;AAKX,wBAAgB,eAAe,CAAC,QAAQ,EAAE,MAAM,GAAG,OAAO,CAGzD;AAKD,wBAAgB,qBAAqB,CACnC,IAAI,EAAE,YAAY,EAClB,QAAQ,EAAE,MAAM,EAChB,kBAAkB,EAAE,GAAG,CAAC,MAAM,EAAE,iBAAiB,EAAE,CAAC,EACpD,QAAQ,EAAE,YAAY,GACrB,eAAe,EAAE,CAgCnB"}
--- a/dist/services/ai-tool-validators.js
+++ b/dist/services/ai-tool-validators.js
@@ -21,9 +21,14 @@ const MIN_DESCRIPTION_LENGTH_MEDIUM = 15;
 const MIN_DESCRIPTION_LENGTH_LONG = 20;
 const MAX_ITERATIONS_WARNING_THRESHOLD = 50;
 const MAX_TOPK_WARNING_THRESHOLD = 20;
+function getToolDescription(node) {
+    return (node.parameters.toolDescription ||
+        node.parameters.description ||
+        node.parameters.options?.description);
+}
 function validateHTTPRequestTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -32,7 +37,7 @@ function validateHTTPRequestTool(node) {
            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,
@@ -154,7 +159,7 @@ function validateHTTPRequestTool(node) {
 }
 function validateCodeTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -184,7 +189,7 @@ function validateCodeTool(node) {
 }
 function validateVectorStoreTool(node, reverseConnections, workflow) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -216,7 +221,7 @@ function validateVectorStoreTool(node, reverseConnections, workflow) {
 }
 function validateWorkflowTool(node, reverseConnections) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -238,7 +243,7 @@ function validateWorkflowTool(node, reverseConnections) {
 }
 function validateAIAgentTool(node, reverseConnections) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -270,7 +275,7 @@ function validateAIAgentTool(node, reverseConnections) {
 }
 function validateMCPClientTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -290,17 +295,15 @@ function validateMCPClientTool(node) {
    }
    return issues;
 }
-function validateCalculatorTool(node) {
-    const issues = [];
-    return issues;
+function validateCalculatorTool(_node) {
+    return [];
 }
-function validateThinkTool(node) {
-    const issues = [];
-    return issues;
+function validateThinkTool(_node) {
+    return [];
 }
 function validateSerpApiTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -321,7 +324,7 @@ function validateSerpApiTool(node) {
 }
 function validateWikipediaTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -345,7 +348,7 @@ function validateWikipediaTool(node) {
 }
 function validateSearXngTool(node) {
    const issues = [];
-    if (!node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'error',
            nodeId: node.id,
@@ -376,7 +379,7 @@ function validateWolframAlphaTool(node) {
            code: 'MISSING_CREDENTIALS'
        });
    }
-    if (!node.parameters.description && !node.parameters.toolDescription) {
+    if (!getToolDescription(node)) {
        issues.push({
            severity: 'info',
            nodeId: node.id,
--- a/dist/services/ai-tool-validators.js.map
+++ b/dist/services/ai-tool-validators.js.map
--- a/dist/services/n8n-api-client.d.ts
+++ b/dist/services/n8n-api-client.d.ts
@@ -36,6 +36,7 @@ export declare class N8nApiClient {
    createTag(tag: Partial<Tag>): Promise<Tag>;
    updateTag(id: string, tag: Partial<Tag>): Promise<Tag>;
    deleteTag(id: string): Promise<void>;
+    updateWorkflowTags(workflowId: string, tagIds: string[]): Promise<Tag[]>;
    getSourceControlStatus(): Promise<SourceControlStatus>;
    pullSourceControl(force?: boolean): Promise<SourceControlPullResult>;
    pushSourceControl(message: string, fileNames?: string[]): Promise<SourceControlPushResult>;
--- a/dist/services/n8n-api-client.d.ts.map
+++ b/dist/services/n8n-api-client.d.ts.map
@@ -1 +1 @@
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+{"version":3,"file":"n8n-api-client.d.ts","sourceRoot":"","sources":["../../src/services/n8n-api-client.ts"],"names":[],"mappings":"AAEA,OAAO,EACL,QAAQ,EACR,kBAAkB,EAClB,oBAAoB,EACpB,SAAS,EACT,mBAAmB,EACnB,qBAAqB,EACrB,UAAU,EACV,oBAAoB,EACpB,sBAAsB,EACtB,GAAG,EACH,aAAa,EACb,eAAe,EACf,mBAAmB,EACnB,cAAc,EACd,QAAQ,EACR,cAAc,EAGd,mBAAmB,EACnB,uBAAuB,EACvB,uBAAuB,EACxB,MAAM,kBAAkB,CAAC;AAS1B,MAAM,WAAW,kBAAkB;IACjC,OAAO,EAAE,MAAM,CAAC;IAChB,MAAM,EAAE,MAAM,CAAC;IACf,OAAO,CAAC,EAAE,MAAM,CAAC;IACjB,UAAU,CAAC,EAAE,MAAM,CAAC;CACrB;AAED,qBAAa,YAAY;IACvB,OAAO,CAAC,MAAM,CAAgB;IAC9B,OAAO,CAAC,UAAU,CAAS;IAC3B,OAAO,CAAC,OAAO,CAAS;IACxB,OAAO,CAAC,WAAW,CAA+B;IAClD,OAAO,CAAC,cAAc,CAA+C;gBAEzD,MAAM,EAAE,kBAAkB;IAqDhC,UAAU,IAAI,OAAO,CAAC,cAAc,GAAG,IAAI,CAAC;YAyBpC,gBAAgB;IAa9B,oBAAoB,IAAI,cAAc,GAAG,IAAI;IAKvC,WAAW,IAAI,OAAO,CAAC,mBAAmB,CAAC;IA6C3C,cAAc,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC;IAU9D,WAAW,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,QAAQ,CAAC;IAS1C,cAAc,CAAC,EAAE,EAAE,MAAM,EAAE,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC;IAsC1E,cAAc,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,QAAQ,CAAC;IAS7C,gBAAgB,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,QAAQ,CAAC;IAS/C,kBAAkB,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,QAAQ,CAAC;IAsBjD,aAAa,CAAC,MAAM,GAAE,kBAAuB,GAAG,OAAO,CAAC,oBAAoB,CAAC;IAU7E,YAAY,CAAC,EAAE,EAAE,MAAM,EAAE,WAAW,UAAQ,GAAG,OAAO,CAAC,SAAS,CAAC;IAwBjE,cAAc,CAAC,MAAM,GAAE,mBAAwB,GAAG,OAAO,CAAC,qBAAqB,CAAC;IAShF,eAAe,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAS1C,cAAc,CAAC,OAAO,EAAE,cAAc,GAAG,OAAO,CAAC,GAAG,CAAC;IAiErD,eAAe,CAAC,MAAM,GAAE,oBAAyB,GAAG,OAAO,CAAC,sBAAsB,CAAC;IASnF,aAAa,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,UAAU,CAAC;IAS9C,gBAAgB,CAAC,UAAU,EAAE,OAAO,CAAC,UAAU,CAAC,GAAG,OAAO,CAAC,UAAU,CAAC;IAStE,gBAAgB,CAAC,EAAE,EAAE,MAAM,EAAE,UAAU,EAAE,OAAO,CAAC,UAAU,CAAC,GAAG,OAAO,CAAC,UAAU,CAAC;IASlF,gBAAgB,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAsB3C,QAAQ,CAAC,MAAM,GAAE,aAAkB,GAAG,OAAO,CAAC,eAAe,CAAC;IAS9D,SAAS,CAAC,GAAG,EAAE,OAAO,CAAC,GAAG,CAAC,GAAG,OAAO,CAAC,GAAG,CAAC;IAS1C,SAAS,CAAC,EAAE,EAAE,MAAM,EAAE,GAAG,EAAE,OAAO,CAAC,GAAG,CAAC,GAAG,OAAO,CAAC,GAAG,CAAC;IAStD,SAAS,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAQpC,kBAAkB,CAAC,UAAU,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,EAAE,GAAG,OAAO,CAAC,GAAG,EAAE,CAAC;IAUxE,sBAAsB,IAAI,OAAO,CAAC,mBAAmB,CAAC;IAStD,iBAAiB,CAAC,KAAK,UAAQ,GAAG,OAAO,CAAC,uBAAuB,CAAC;IASlE,iBAAiB,CACrB,OAAO,EAAE,MAAM,EACf,SAAS,CAAC,EAAE,MAAM,EAAE,GACnB,OAAO,CAAC,uBAAuB,CAAC;IAa7B,YAAY,IAAI,OAAO,CAAC,QAAQ,EAAE,CAAC;IAWnC,cAAc,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC;IAS9D,cAAc,CAAC,EAAE,EAAE,MAAM,EAAE,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC;IAS1E,cAAc,CAAC,EAAE,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAiB/C,OAAO,CAAC,oBAAoB;CAmC7B"}
--- a/dist/services/n8n-api-client.js
+++ b/dist/services/n8n-api-client.js
@@ -196,7 +196,7 @@ class N8nApiClient {
    }
    async activateWorkflow(id) {
        try {
-            const response = await this.client.post(`/workflows/${id}/activate`);
+            const response = await this.client.post(`/workflows/${id}/activate`, {});
            return response.data;
        }
        catch (error) {
@@ -205,7 +205,7 @@ class N8nApiClient {
    }
    async deactivateWorkflow(id) {
        try {
-            const response = await this.client.post(`/workflows/${id}/deactivate`);
+            const response = await this.client.post(`/workflows/${id}/deactivate`, {});
            return response.data;
        }
        catch (error) {
@@ -365,6 +365,15 @@ class N8nApiClient {
            throw (0, n8n_errors_1.handleN8nApiError)(error);
        }
    }
+    async updateWorkflowTags(workflowId, tagIds) {
+        try {
+            const response = await this.client.put(`/workflows/${workflowId}/tags`, tagIds.filter(id => id).map(id => ({ id })));
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
    async getSourceControlStatus() {
        try {
            const response = await this.client.get('/source-control/status');
--- a/dist/services/n8n-api-client.js.map
+++ b/dist/services/n8n-api-client.js.map
--- a/dist/services/n8n-validation.d.ts
+++ b/dist/services/n8n-validation.d.ts
@@ -144,79 +144,227 @@ export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObj
        node: string;
        index: number;
    }>, "many">, "many">>;
+}, "strip", z.ZodArray<z.ZodArray<z.ZodObject<{
+    node: z.ZodString;
+    type: z.ZodString;
+    index: z.ZodNumber;
 }, "strip", z.ZodTypeAny, {
-    error?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    main?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    ai_tool?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    ai_languageModel?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    ai_memory?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    ai_embedding?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
-    ai_vectorStore?: {
-        type: string;
-        node: string;
-        index: number;
-    }[][] | undefined;
+    type: string;
+    node: string;
+    index: number;
 }, {
-    error?: {
+    type: string;
+    node: string;
+    index: number;
+}>, "many">, "many">, z.objectOutputType<{
+    main: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    main?: {
+    }, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    ai_tool?: {
+    }>, "many">, "many">>;
+    error: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    ai_languageModel?: {
+    }, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    ai_memory?: {
+    }>, "many">, "many">>;
+    ai_tool: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    ai_embedding?: {
+    }, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-    ai_vectorStore?: {
+    }>, "many">, "many">>;
+    ai_languageModel: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
        type: string;
        node: string;
        index: number;
-    }[][] | undefined;
-}>>;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_memory: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_embedding: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_vectorStore: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+}, z.ZodArray<z.ZodArray<z.ZodObject<{
+    node: z.ZodString;
+    type: z.ZodString;
+    index: z.ZodNumber;
+}, "strip", z.ZodTypeAny, {
+    type: string;
+    node: string;
+    index: number;
+}, {
+    type: string;
+    node: string;
+    index: number;
+}>, "many">, "many">, "strip">, z.objectInputType<{
+    main: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    error: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_tool: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_languageModel: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_memory: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_embedding: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+    ai_vectorStore: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
+        node: z.ZodString;
+        type: z.ZodString;
+        index: z.ZodNumber;
+    }, "strip", z.ZodTypeAny, {
+        type: string;
+        node: string;
+        index: number;
+    }, {
+        type: string;
+        node: string;
+        index: number;
+    }>, "many">, "many">>;
+}, z.ZodArray<z.ZodArray<z.ZodObject<{
+    node: z.ZodString;
+    type: z.ZodString;
+    index: z.ZodNumber;
+}, "strip", z.ZodTypeAny, {
+    type: string;
+    node: string;
+    index: number;
+}, {
+    type: string;
+    node: string;
+    index: number;
+}>, "many">, "many">, "strip">>>;
 export declare const workflowSettingsSchema: z.ZodObject<{
    executionOrder: z.ZodDefault<z.ZodEnum<["v0", "v1"]>>;
    timezone: z.ZodOptional<z.ZodString>;
--- a/dist/services/n8n-validation.d.ts.map
+++ b/dist/services/n8n-validation.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"n8n-validation.d.ts","sourceRoot":"","sources":["../../src/services/n8n-validation.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,CAAC,EAAE,MAAM,KAAK,CAAC;AACxB,OAAO,EAAE,YAAY,EAAE,kBAAkB,EAAE,QAAQ,EAAE,MAAM,kBAAkB,CAAC;AAM9E,eAAO,MAAM,kBAAkB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAiB7B,CAAC;AAkBH,eAAO,MAAM,wBAAwB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GAUpC,CAAC;AAEF,eAAO,MAAM,sBAAsB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAWjC,CAAC;AAGH,eAAO,MAAM,uBAAuB;;;;;;CAMnC,CAAC;AAGF,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,OAAO,GAAG,YAAY,CAEhE;AAED,wBAAgB,2BAA2B,CAAC,WAAW,EAAE,OAAO,GAAG,kBAAkB,CAEpF;AAED,wBAAgB,wBAAwB,CAAC,QAAQ,EAAE,OAAO,GAAG,CAAC,CAAC,KAAK,CAAC,OAAO,sBAAsB,CAAC,CAElG;AAGD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC,CAsBrF;AAiBD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAAC,QAAQ,CAAC,CAoE5E;AAGD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,MAAM,EAAE,CA6P/E;AAGD,wBAAgB,iBAAiB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAK7D;AAMD,wBAAgB,+BAA+B,CAAC,IAAI,EAAE,YAAY,GAAG,MAAM,EAAE,CA+F5E;AAMD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,GAAG,EAAE,IAAI,EAAE,MAAM,GAAG,MAAM,EAAE,CA0D/E;AAGD,wBAAgB,aAAa,CAAC,QAAQ,EAAE,QAAQ,GAAG,MAAM,GAAG,IAAI,CAmB/D;AAGD,wBAAgB,2BAA2B,IAAI,MAAM,CA6CpD;AAGD,wBAAgB,yBAAyB,CAAC,MAAM,EAAE,MAAM,EAAE,GAAG,MAAM,EAAE,CAmBpE"}
+{"version":3,"file":"n8n-validation.d.ts","sourceRoot":"","sources":["../../src/services/n8n-validation.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,CAAC,EAAE,MAAM,KAAK,CAAC;AACxB,OAAO,EAAE,YAAY,EAAE,kBAAkB,EAAE,QAAQ,EAAE,MAAM,kBAAkB,CAAC;AAM9E,eAAO,MAAM,kBAAkB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAiB7B,CAAC;AAkBH,eAAO,MAAM,wBAAwB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;gCAUpC,CAAC;AAEF,eAAO,MAAM,sBAAsB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAWjC,CAAC;AAGH,eAAO,MAAM,uBAAuB;;;;;;CAMnC,CAAC;AAGF,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,OAAO,GAAG,YAAY,CAEhE;AAED,wBAAgB,2BAA2B,CAAC,WAAW,EAAE,OAAO,GAAG,kBAAkB,CAEpF;AAED,wBAAgB,wBAAwB,CAAC,QAAQ,EAAE,OAAO,GAAG,CAAC,CAAC,KAAK,CAAC,OAAO,sBAAsB,CAAC,CAElG;AAGD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC,CAsBrF;AAiBD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAAC,QAAQ,CAAC,CAoE5E;AAGD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,MAAM,EAAE,CAkQ/E;AAGD,wBAAgB,iBAAiB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAK7D;AAMD,wBAAgB,+BAA+B,CAAC,IAAI,EAAE,YAAY,GAAG,MAAM,EAAE,CA+F5E;AAMD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,GAAG,EAAE,IAAI,EAAE,MAAM,GAAG,MAAM,EAAE,CA0D/E;AAGD,wBAAgB,aAAa,CAAC,QAAQ,EAAE,QAAQ,GAAG,MAAM,GAAG,IAAI,CAmB/D;AAGD,wBAAgB,2BAA2B,IAAI,MAAM,CA6CpD;AAGD,wBAAgB,yBAAyB,CAAC,MAAM,EAAE,MAAM,EAAE,GAAG,MAAM,EAAE,CAmBpE"}
--- a/dist/services/n8n-validation.js
+++ b/dist/services/n8n-validation.js
@@ -47,7 +47,7 @@ exports.workflowConnectionSchema = zod_1.z.record(zod_1.z.object({
    ai_memory: connectionArraySchema.optional(),
    ai_embedding: connectionArraySchema.optional(),
    ai_vectorStore: connectionArraySchema.optional(),
-}));
+}).catchall(connectionArraySchema));
 exports.workflowSettingsSchema = zod_1.z.object({
    executionOrder: zod_1.z.enum(['v0', 'v1']).default('v1'),
    timezone: zod_1.z.string().optional(),
@@ -152,11 +152,10 @@ 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);
-                ALL_CONNECTION_TYPES.forEach(connType => {
-                    const connData = connection[connType];
+                const connectionRecord = connection;
+                Object.values(connectionRecord).forEach((connData) => {
                    if (connData && Array.isArray(connData)) {
                        connData.forEach((outputs) => {
                            if (Array.isArray(outputs)) {
@@ -282,23 +281,28 @@ function validateWorkflowStructure(workflow) {
                    errors.push(`Connection references non-existent node: ${sourceName}`);
                }
            }
-            if (connection.main && Array.isArray(connection.main)) {
-                connection.main.forEach((outputs, outputIndex) => {
-                    if (Array.isArray(outputs)) {
-                        outputs.forEach((target, targetIndex) => {
-                            if (!nodeNames.has(target.node)) {
-                                if (nodeIds.has(target.node)) {
-                                    const correctName = nodeIdToName.get(target.node);
-                                    errors.push(`Connection target uses node ID '${target.node}' but must use node name '${correctName}' (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+            const connectionRecord = connection;
+            Object.values(connectionRecord).forEach((connData) => {
+                if (connData && Array.isArray(connData)) {
+                    connData.forEach((outputs, outputIndex) => {
+                        if (Array.isArray(outputs)) {
+                            outputs.forEach((target, targetIndex) => {
+                                if (!target?.node)
+                                    return;
+                                if (!nodeNames.has(target.node)) {
+                                    if (nodeIds.has(target.node)) {
+                                        const correctName = nodeIdToName.get(target.node);
+                                        errors.push(`Connection target uses node ID '${target.node}' but must use node name '${correctName}' (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+                                    }
+                                    else {
+                                        errors.push(`Connection references non-existent target node: ${target.node} (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+                                    }
                                }
-                                else {
-                                    errors.push(`Connection references non-existent target node: ${target.node} (from ${sourceName}[${outputIndex}][${targetIndex}])`);
-                                }
-                            }
-                        });
-                    }
-                });
-            }
+                            });
+                        }
+                    });
+                }
+            });
        });
    }
    return errors;
--- a/dist/services/n8n-validation.js.map
+++ b/dist/services/n8n-validation.js.map
--- a/dist/services/node-sanitizer.d.ts.map
+++ b/dist/services/node-sanitizer.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"node-sanitizer.d.ts","sourceRoot":"","sources":["../../src/services/node-sanitizer.ts"],"names":[],"mappings":"AAaA,OAAO,EAAE,YAAY,EAAE,MAAM,kBAAkB,CAAC;AAKhD,wBAAgB,YAAY,CAAC,IAAI,EAAE,YAAY,GAAG,YAAY,CAa7D;AAKD,wBAAgB,qBAAqB,CAAC,QAAQ,EAAE,GAAG,GAAG,GAAG,CASxD;AAoND,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,YAAY,GAAG,MAAM,EAAE,CAgEjE"}
+{"version":3,"file":"node-sanitizer.d.ts","sourceRoot":"","sources":["../../src/services/node-sanitizer.ts"],"names":[],"mappings":"AAaA,OAAO,EAAE,YAAY,EAAE,MAAM,kBAAkB,CAAC;AAKhD,wBAAgB,YAAY,CAAC,IAAI,EAAE,YAAY,GAAG,YAAY,CAa7D;AAKD,wBAAgB,qBAAqB,CAAC,QAAQ,EAAE,GAAG,GAAG,GAAG,CASxD;AA6ND,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,YAAY,GAAG,MAAM,EAAE,CAgEjE"}
--- a/dist/services/node-sanitizer.js
+++ b/dist/services/node-sanitizer.js
@@ -17,7 +17,7 @@ function sanitizeWorkflowNodes(workflow) {
    }
    return {
        ...workflow,
-        nodes: workflow.nodes.map((node) => sanitizeNode(node))
+        nodes: workflow.nodes.map(sanitizeNode)
    };
 }
 function isFilterBasedNode(nodeType, typeVersion) {
@@ -66,7 +66,7 @@ function sanitizeFilterConditions(conditions) {
        ...sanitized.options
    };
    if (sanitized.conditions && Array.isArray(sanitized.conditions)) {
-        sanitized.conditions = sanitized.conditions.map((condition) => sanitizeCondition(condition));
+        sanitized.conditions = sanitized.conditions.map(sanitizeCondition);
    }
    return sanitized;
 }
@@ -124,6 +124,10 @@ function inferDataType(operation) {
    if (dateOps.some(op => operation.includes(op))) {
        return 'dateTime';
    }
+    const objectOps = ['empty', 'notEmpty', 'exists', 'notExists'];
+    if (objectOps.includes(operation)) {
+        return 'object';
+    }
    return 'string';
 }
 function isUnaryOperator(operation) {
@@ -132,7 +136,11 @@ function isUnaryOperator(operation) {
        'isNotEmpty',
        'true',
        'false',
-        'isNumeric'
+        'isNumeric',
+        'empty',
+        'notEmpty',
+        'exists',
+        'notExists'
    ];
    return unaryOps.includes(operation);
 }
--- a/dist/services/node-sanitizer.js.map
+++ b/dist/services/node-sanitizer.js.map
--- a/dist/services/node-specific-validators.d.ts.map
+++ b/dist/services/node-specific-validators.d.ts.map
@@ -1 +1 @@
-{"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;IAsFtC,OAAO,CAAC,MAAM,CAAC,oBAAoB;IAuKnC,OAAO,CAAC,MAAM,CAAC,oBAAoB;IA2EnC,MAAM,CAAC,WAAW,CAAC,OAAO,EAAE,qBAAqB,GAAG,IAAI;CAoDzD"}
+{"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"}
--- a/dist/services/node-specific-validators.js
+++ b/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',
--- a/dist/services/node-specific-validators.js.map
+++ b/dist/services/node-specific-validators.js.map
--- a/dist/services/workflow-auto-fixer.d.ts.map
+++ b/dist/services/workflow-auto-fixer.d.ts.map
@@ -1 +1 @@
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+{"version":3,"file":"workflow-auto-fixer.d.ts","sourceRoot":"","sources":["../../src/services/workflow-auto-fixer.ts"],"names":[],"mappings":"AAQA,OAAO,EAAE,wBAAwB,EAA0B,MAAM,sBAAsB,CAAC;AACxF,OAAO,EAAE,qBAAqB,EAAE,MAAM,+BAA+B,CAAC;AAEtE,OAAO,EAAE,cAAc,EAAE,MAAM,6BAA6B,CAAC;AAC7D,OAAO,EACL,qBAAqB,EAGtB,MAAM,wBAAwB,CAAC;AAChC,OAAO,EAAgB,QAAQ,EAAE,MAAM,kBAAkB,CAAC;AAK1D,OAAO,EAAuB,kBAAkB,EAAE,MAAM,yBAAyB,CAAC;AAIlF,MAAM,MAAM,kBAAkB,GAAG,MAAM,GAAG,QAAQ,GAAG,KAAK,CAAC;AAC3D,MAAM,MAAM,OAAO,GACf,mBAAmB,GACnB,wBAAwB,GACxB,qBAAqB,GACrB,sBAAsB,GACtB,sBAAsB,GACtB,qBAAqB,GACrB,mBAAmB,GACnB,yBAAyB,GACzB,yBAAyB,GACzB,yBAAyB,GACzB,uBAAuB,GACvB,8BAA8B,GAC9B,wBAAwB,CAAC;AAE7B,eAAO,MAAM,oBAAoB,EAAE,OAAO,EAMzC,CAAC;AAEF,MAAM,WAAW,aAAa;IAC5B,UAAU,EAAE,OAAO,CAAC;IACpB,QAAQ,CAAC,EAAE,OAAO,EAAE,CAAC;IACrB,mBAAmB,CAAC,EAAE,kBAAkB,CAAC;IACzC,QAAQ,CAAC,EAAE,MAAM,CAAC;CACnB;AAED,MAAM,WAAW,YAAY;IAC3B,IAAI,EAAE,MAAM,CAAC;IACb,KAAK,EAAE,MAAM,CAAC;IACd,IAAI,EAAE,OAAO,CAAC;IACd,MAAM,EAAE,GAAG,CAAC;IACZ,KAAK,EAAE,GAAG,CAAC;IACX,UAAU,EAAE,kBAAkB,CAAC;IAC/B,WAAW,EAAE,MAAM,CAAC;CACrB;AAED,MAAM,WAAW,aAAa;IAC5B,UAAU,EAAE,qBAAqB,EAAE,CAAC;IACpC,KAAK,EAAE,YAAY,EAAE,CAAC;IACtB,OAAO,EAAE,MAAM,CAAC;IAChB,KAAK,EAAE;QACL,KAAK,EAAE,MAAM,CAAC;QACd,MAAM,EAAE,MAAM,CAAC,OAAO,EAAE,MAAM,CAAC,CAAC;QAChC,YAAY,EAAE,MAAM,CAAC,kBAAkB,EAAE,MAAM,CAAC,CAAC;KAClD,CAAC;IACF,kBAAkB,CAAC,EAAE,kBAAkB,EAAE,CAAC;CAC3C;AAED,MAAM,WAAW,eAAgB,SAAQ,qBAAqB;IAC5D,QAAQ,EAAE,MAAM,CAAC;IACjB,MAAM,EAAE,MAAM,CAAC;CAChB;AAKD,wBAAgB,iBAAiB,CAAC,KAAK,EAAE,qBAAqB,GAAG,KAAK,IAAI,eAAe,CAIxF;AAKD,MAAM,WAAW,aAAa;IAC5B,IAAI,EAAE,OAAO,CAAC;IACd,MAAM,CAAC,EAAE,MAAM,CAAC;IAChB,QAAQ,CAAC,EAAE,MAAM,CAAC;IAClB,OAAO,EAAE,MAAM,CAAC;IAChB,WAAW,CAAC,EAAE,KAAK,CAAC;QAClB,QAAQ,EAAE,MAAM,CAAC;QACjB,UAAU,EAAE,MAAM,CAAC;QACnB,MAAM,EAAE,MAAM,CAAC;KAChB,CAAC,CAAC;CACJ;AAED,qBAAa,iBAAiB;IAC5B,OAAO,CAAC,QAAQ,CAAC,aAAa,CAI5B;IACF,OAAO,CAAC,iBAAiB,CAAsC;IAC/D,OAAO,CAAC,cAAc,CAAmC;IACzD,OAAO,CAAC,sBAAsB,CAAuC;IACrE,OAAO,CAAC,gBAAgB,CAAqC;IAC7D,OAAO,CAAC,mBAAmB,CAAoC;gBAEnD,UAAU,CAAC,EAAE,cAAc;IAajC,aAAa,CACjB,QAAQ,EAAE,QAAQ,EAClB,gBAAgB,EAAE,wBAAwB,EAC1C,YAAY,GAAE,qBAAqB,EAAO,EAC1C,MAAM,GAAE,OAAO,CAAC,aAAa,CAAM,GAClC,OAAO,CAAC,aAAa,CAAC;IAgFzB,OAAO,CAAC,4BAA4B;IAqEpC,OAAO,CAAC,uBAAuB;IA8C/B,OAAO,CAAC,uBAAuB;IA0C/B,OAAO,CAAC,oBAAoB;IAkD5B,OAAO,CAAC,uBAAuB;IAwE/B,OAAO,CAAC,uBAAuB;IAsD/B,OAAO,CAAC,cAAc;IAmGtB,OAAO,CAAC,kBAAkB;IAkB1B,OAAO,CAAC,uBAAuB;IAuB/B,OAAO,CAAC,cAAc;IAoCtB,OAAO,CAAC,eAAe;IAwDvB,OAAO,CAAC,sBAAsB;IAgF9B,OAAO,CAAC,cAAc;IA+DtB,OAAO,CAAC,WAAW;IA6EnB,OAAO,CAAC,eAAe;IAqCvB,OAAO,CAAC,eAAe;IA4DvB,OAAO,CAAC,uBAAuB;YA6CjB,0BAA0B;YAoF1B,4BAA4B;CAiF3C"}
--- a/dist/services/workflow-auto-fixer.js
+++ b/dist/services/workflow-auto-fixer.js
@@ -405,7 +405,7 @@ class WorkflowAutoFixer {
        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 || '');
+                return fixedNodes.has(op.nodeName || '') || fixedNodes.has(op.nodeId || '');
            }
            if (op.type === 'replaceConnections') {
                return hasConnectionFixes;
@@ -794,6 +794,7 @@ class WorkflowAutoFixer {
                const operation = {
                    type: 'updateNode',
                    nodeId: node.id,
+                    nodeName: node.name,
                    updates: {
                        typeVersion: parseFloat(latestVersion),
                        parameters: migrationResult.updatedNode.parameters,
--- a/dist/services/workflow-auto-fixer.js.map
+++ b/dist/services/workflow-auto-fixer.js.map
--- a/dist/services/workflow-diff-engine.d.ts
+++ b/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;
--- a/dist/services/workflow-diff-engine.d.ts.map
+++ b/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"}
--- a/dist/services/workflow-diff-engine.js
+++ b/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;
--- a/dist/services/workflow-diff-engine.js.map
+++ b/dist/services/workflow-diff-engine.js.map
--- a/dist/types/n8n-api.d.ts
+++ b/dist/types/n8n-api.d.ts
@@ -259,6 +259,7 @@ export interface WebhookRequest {
 }
 export interface McpToolResponse {
    success: boolean;
+    saved?: boolean;
    data?: unknown;
    error?: string;
    message?: string;
@@ -266,6 +267,7 @@ export interface McpToolResponse {
    details?: Record<string, unknown>;
    executionId?: string;
    workflowId?: string;
+    operationsApplied?: number;
 }
 export type ExecutionMode = 'preview' | 'summary' | 'filtered' | 'full' | 'error';
 export interface ExecutionPreview {
--- a/dist/types/n8n-api.d.ts.map
+++ b/dist/types/n8n-api.d.ts.map
--- a/dist/types/workflow-diff.d.ts
+++ b/dist/types/workflow-diff.d.ts
@@ -137,6 +137,8 @@ export interface WorkflowDiffResult {
    }>;
    shouldActivate?: boolean;
    shouldDeactivate?: boolean;
+    tagsToAdd?: string[];
+    tagsToRemove?: string[];
 }
 export interface NodeReference {
    id?: string;
--- a/dist/types/workflow-diff.d.ts.map
+++ b/dist/types/workflow-diff.d.ts.map
@@ -1 +1 @@
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--- a/dist/types/workflow-diff.js.map
+++ b/dist/types/workflow-diff.js.map
@@ -1 +1 @@
-{"version":3,"file":"workflow-diff.js","sourceRoot":"","sources":["../../src/types/workflow-diff.ts"],"names":[],"mappings":";;AAyMA,0CAIC;AAED,sDAGC;AAED,kDAGC;AAdD,SAAgB,eAAe,CAAC,EAAyB;IAGvD,OAAO,CAAC,SAAS,EAAE,YAAY,EAAE,YAAY,EAAE,UAAU,EAAE,YAAY,EAAE,aAAa,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AAC5G,CAAC;AAED,SAAgB,qBAAqB,CAAC,EAAyB;IAE7D,OAAO,CAAC,eAAe,EAAE,kBAAkB,EAAE,kBAAkB,EAAE,uBAAuB,EAAE,oBAAoB,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AACpI,CAAC;AAED,SAAgB,mBAAmB,CAAC,EAAyB;IAE3D,OAAO,CAAC,gBAAgB,EAAE,YAAY,EAAE,QAAQ,EAAE,WAAW,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AACnF,CAAC"}
+{"version":3,"file":"workflow-diff.js","sourceRoot":"","sources":["../../src/types/workflow-diff.ts"],"names":[],"mappings":";;AA2MA,0CAIC;AAED,sDAGC;AAED,kDAGC;AAdD,SAAgB,eAAe,CAAC,EAAyB;IAGvD,OAAO,CAAC,SAAS,EAAE,YAAY,EAAE,YAAY,EAAE,UAAU,EAAE,YAAY,EAAE,aAAa,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AAC5G,CAAC;AAED,SAAgB,qBAAqB,CAAC,EAAyB;IAE7D,OAAO,CAAC,eAAe,EAAE,kBAAkB,EAAE,kBAAkB,EAAE,uBAAuB,EAAE,oBAAoB,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AACpI,CAAC;AAED,SAAgB,mBAAmB,CAAC,EAAyB;IAE3D,OAAO,CAAC,gBAAgB,EAAE,YAAY,EAAE,QAAQ,EAAE,WAAW,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;AACnF,CAAC"}
--- a/dist/utils/node-type-utils.js
+++ b/dist/utils/node-type-utils.js
@@ -87,12 +87,10 @@ function isTriggerNode(nodeType) {
    if (lowerType.includes('webhook') && !lowerType.includes('respond')) {
        return true;
    }
-    const specificTriggers = [
-        'nodes-base.start',
-        'nodes-base.manualTrigger',
-        'nodes-base.formTrigger'
-    ];
-    return specificTriggers.includes(normalized);
+    if (lowerType.includes('emailread') || lowerType.includes('emailreadimap')) {
+        return true;
+    }
+    return normalized === 'nodes-base.start';
 }
 function isActivatableTrigger(nodeType) {
    return isTriggerNode(nodeType);
--- a/dist/utils/node-type-utils.js.map
+++ b/dist/utils/node-type-utils.js.map
@@ -1 +1 @@
-{"version":3,"file":"node-type-utils.js","sourceRoot":"","sources":["../../src/utils/node-type-utils.ts"],"names":[],"mappings":";;AAcA,8CAMC;AASD,kDAQC;AASD,0CASC;AASD,wCASC;AAKD,gCAGC;AAKD,0CAGC;AAMD,sDAaC;AAUD,sDAwBC;AAkBD,sCAsBC;AAqBD,oDAGC;AAQD,8DAiCC;AAzOD,SAAgB,iBAAiB,CAAC,IAAY;IAC5C,IAAI,CAAC,IAAI;QAAE,OAAO,IAAI,CAAC;IAEvB,OAAO,IAAI;SACR,OAAO,CAAC,mBAAmB,EAAE,aAAa,CAAC;SAC3C,OAAO,CAAC,8BAA8B,EAAE,kBAAkB,CAAC,CAAC;AACjE,CAAC;AASD,SAAgB,mBAAmB,CAAC,IAAY,EAAE,WAAiC;IACjF,IAAI,CAAC,IAAI;QAAE,OAAO,IAAI,CAAC;IAEvB,IAAI,WAAW,KAAK,MAAM,EAAE,CAAC;QAC3B,OAAO,IAAI,CAAC,OAAO,CAAC,eAAe,EAAE,iBAAiB,CAAC,CAAC;IAC1D,CAAC;IAED,OAAO,IAAI,CAAC,OAAO,CAAC,oBAAoB,EAAE,2BAA2B,CAAC,CAAC;AACzE,CAAC;AASD,SAAgB,eAAe,CAAC,IAAY;IAC1C,IAAI,CAAC,IAAI;QAAE,OAAO,EAAE,CAAC;IAGrB,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAG3C,MAAM,KAAK,GAAG,UAAU,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IACpC,OAAO,KAAK,CAAC,KAAK,CAAC,MAAM,GAAG,CAAC,CAAC,IAAI,EAAE,CAAC;AACvC,CAAC;AASD,SAAgB,cAAc,CAAC,IAAY;IACzC,IAAI,CAAC,IAAI,IAAI,CAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC;QAAE,OAAO,IAAI,CAAC;IAG9C,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAG3C,MAAM,KAAK,GAAG,UAAU,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IACpC,OAAO,KAAK,CAAC,CAAC,CAAC,IAAI,IAAI,CAAC;AAC1B,CAAC;AAKD,SAAgB,UAAU,CAAC,IAAY;IACrC,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAC3C,OAAO,UAAU,CAAC,UAAU,CAAC,aAAa,CAAC,CAAC;AAC9C,CAAC;AAKD,SAAgB,eAAe,CAAC,IAAY;IAC1C,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAC3C,OAAO,UAAU,CAAC,UAAU,CAAC,kBAAkB,CAAC,CAAC;AACnD,CAAC;AAMD,SAAgB,qBAAqB,CAAC,IAAY;IAChD,IAAI,CAAC,IAAI,IAAI,OAAO,IAAI,KAAK,QAAQ;QAAE,OAAO,KAAK,CAAC;IAGpD,IAAI,CAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC;QAAE,OAAO,KAAK,CAAC;IAEtC,MAAM,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IAG9B,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC;QAAE,OAAO,KAAK,CAAC;IAGrC,OAAO,KAAK,CAAC,CAAC,CAAC,CAAC,MAAM,GAAG,CAAC,IAAI,KAAK,CAAC,CAAC,CAAC,CAAC,MAAM,GAAG,CAAC,CAAC;AACpD,CAAC;AAUD,SAAgB,qBAAqB,CAAC,IAAY;IAChD,MAAM,UAAU,GAAa,EAAE,CAAC;IAGhC,IAAI,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC,EAAE,CAAC;QACvB,UAAU,CAAC,IAAI,CAAC,iBAAiB,CAAC,IAAI,CAAC,CAAC,CAAC;QAGzC,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;QAC3C,IAAI,UAAU,CAAC,UAAU,CAAC,aAAa,CAAC,EAAE,CAAC;YACzC,UAAU,CAAC,IAAI,CAAC,mBAAmB,CAAC,UAAU,EAAE,MAAM,CAAC,CAAC,CAAC;QAC3D,CAAC;aAAM,IAAI,UAAU,CAAC,UAAU,CAAC,kBAAkB,CAAC,EAAE,CAAC;YACrD,UAAU,CAAC,IAAI,CAAC,mBAAmB,CAAC,UAAU,EAAE,WAAW,CAAC,CAAC,CAAC;QAChE,CAAC;IACH,CAAC;SAAM,CAAC;QAEN,UAAU,CAAC,IAAI,CAAC,cAAc,IAAI,EAAE,CAAC,CAAC;QACtC,UAAU,CAAC,IAAI,CAAC,kBAAkB,IAAI,EAAE,CAAC,CAAC;QAC1C,UAAU,CAAC,IAAI,CAAC,mBAAmB,IAAI,EAAE,CAAC,CAAC;QAC3C,UAAU,CAAC,IAAI,CAAC,4BAA4B,IAAI,EAAE,CAAC,CAAC;IACtD,CAAC;IAGD,OAAO,CAAC,GAAG,IAAI,GAAG,CAAC,UAAU,CAAC,CAAC,CAAC;AAClC,CAAC;AAkBD,SAAgB,aAAa,CAAC,QAAgB;IAC5C,MAAM,UAAU,GAAG,iBAAiB,CAAC,QAAQ,CAAC,CAAC;IAC/C,MAAM,SAAS,GAAG,UAAU,CAAC,WAAW,EAAE,CAAC;IAG3C,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,IAAI,CAAC;IACd,CAAC;IAGD,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,IAAI,CAAC,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QACpE,OAAO,IAAI,CAAC;IACd,CAAC;IAGD,MAAM,gBAAgB,GAAG;QACvB,kBAAkB;QAClB,0BAA0B;QAC1B,wBAAwB;KACzB,CAAC;IAEF,OAAO,gBAAgB,CAAC,QAAQ,CAAC,UAAU,CAAC,CAAC;AAC/C,CAAC;AAqBD,SAAgB,oBAAoB,CAAC,QAAgB;IAEnD,OAAO,aAAa,CAAC,QAAQ,CAAC,CAAC;AACjC,CAAC;AAQD,SAAgB,yBAAyB,CAAC,QAAgB;IACxD,MAAM,UAAU,GAAG,iBAAiB,CAAC,QAAQ,CAAC,CAAC;IAC/C,MAAM,SAAS,GAAG,UAAU,CAAC,WAAW,EAAE,CAAC;IAE3C,IAAI,SAAS,CAAC,QAAQ,CAAC,iBAAiB,CAAC,EAAE,CAAC;QAC1C,OAAO,uDAAuD,CAAC;IACjE,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,iCAAiC,CAAC;IAC3C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,UAAU,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC;QACjE,OAAO,+BAA+B,CAAC;IACzC,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,QAAQ,CAAC,IAAI,UAAU,KAAK,kBAAkB,EAAE,CAAC;QACtE,OAAO,mCAAmC,CAAC;IAC7C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,OAAO,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,OAAO,CAAC,EAAE,CAAC;QAC7F,OAAO,yBAAyB,CAAC;IACnC,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC;QAC/B,OAAO,iCAAiC,CAAC;IAC3C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,uBAAuB,CAAC;IACjC,CAAC;IAED,OAAO,sBAAsB,CAAC;AAChC,CAAC"}
+{"version":3,"file":"node-type-utils.js","sourceRoot":"","sources":["../../src/utils/node-type-utils.ts"],"names":[],"mappings":";;AAcA,8CAMC;AASD,kDAQC;AASD,0CASC;AASD,wCASC;AAKD,gCAGC;AAKD,0CAGC;AAMD,sDAaC;AAUD,sDAwBC;AAkBD,sCAsBC;AAqBD,oDAGC;AAQD,8DAiCC;AAzOD,SAAgB,iBAAiB,CAAC,IAAY;IAC5C,IAAI,CAAC,IAAI;QAAE,OAAO,IAAI,CAAC;IAEvB,OAAO,IAAI;SACR,OAAO,CAAC,mBAAmB,EAAE,aAAa,CAAC;SAC3C,OAAO,CAAC,8BAA8B,EAAE,kBAAkB,CAAC,CAAC;AACjE,CAAC;AASD,SAAgB,mBAAmB,CAAC,IAAY,EAAE,WAAiC;IACjF,IAAI,CAAC,IAAI;QAAE,OAAO,IAAI,CAAC;IAEvB,IAAI,WAAW,KAAK,MAAM,EAAE,CAAC;QAC3B,OAAO,IAAI,CAAC,OAAO,CAAC,eAAe,EAAE,iBAAiB,CAAC,CAAC;IAC1D,CAAC;IAED,OAAO,IAAI,CAAC,OAAO,CAAC,oBAAoB,EAAE,2BAA2B,CAAC,CAAC;AACzE,CAAC;AASD,SAAgB,eAAe,CAAC,IAAY;IAC1C,IAAI,CAAC,IAAI;QAAE,OAAO,EAAE,CAAC;IAGrB,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAG3C,MAAM,KAAK,GAAG,UAAU,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IACpC,OAAO,KAAK,CAAC,KAAK,CAAC,MAAM,GAAG,CAAC,CAAC,IAAI,EAAE,CAAC;AACvC,CAAC;AASD,SAAgB,cAAc,CAAC,IAAY;IACzC,IAAI,CAAC,IAAI,IAAI,CAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC;QAAE,OAAO,IAAI,CAAC;IAG9C,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAG3C,MAAM,KAAK,GAAG,UAAU,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IACpC,OAAO,KAAK,CAAC,CAAC,CAAC,IAAI,IAAI,CAAC;AAC1B,CAAC;AAKD,SAAgB,UAAU,CAAC,IAAY;IACrC,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAC3C,OAAO,UAAU,CAAC,UAAU,CAAC,aAAa,CAAC,CAAC;AAC9C,CAAC;AAKD,SAAgB,eAAe,CAAC,IAAY;IAC1C,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;IAC3C,OAAO,UAAU,CAAC,UAAU,CAAC,kBAAkB,CAAC,CAAC;AACnD,CAAC;AAMD,SAAgB,qBAAqB,CAAC,IAAY;IAChD,IAAI,CAAC,IAAI,IAAI,OAAO,IAAI,KAAK,QAAQ;QAAE,OAAO,KAAK,CAAC;IAGpD,IAAI,CAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC;QAAE,OAAO,KAAK,CAAC;IAEtC,MAAM,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IAG9B,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC;QAAE,OAAO,KAAK,CAAC;IAGrC,OAAO,KAAK,CAAC,CAAC,CAAC,CAAC,MAAM,GAAG,CAAC,IAAI,KAAK,CAAC,CAAC,CAAC,CAAC,MAAM,GAAG,CAAC,CAAC;AACpD,CAAC;AAUD,SAAgB,qBAAqB,CAAC,IAAY;IAChD,MAAM,UAAU,GAAa,EAAE,CAAC;IAGhC,IAAI,IAAI,CAAC,QAAQ,CAAC,GAAG,CAAC,EAAE,CAAC;QACvB,UAAU,CAAC,IAAI,CAAC,iBAAiB,CAAC,IAAI,CAAC,CAAC,CAAC;QAGzC,MAAM,UAAU,GAAG,iBAAiB,CAAC,IAAI,CAAC,CAAC;QAC3C,IAAI,UAAU,CAAC,UAAU,CAAC,aAAa,CAAC,EAAE,CAAC;YACzC,UAAU,CAAC,IAAI,CAAC,mBAAmB,CAAC,UAAU,EAAE,MAAM,CAAC,CAAC,CAAC;QAC3D,CAAC;aAAM,IAAI,UAAU,CAAC,UAAU,CAAC,kBAAkB,CAAC,EAAE,CAAC;YACrD,UAAU,CAAC,IAAI,CAAC,mBAAmB,CAAC,UAAU,EAAE,WAAW,CAAC,CAAC,CAAC;QAChE,CAAC;IACH,CAAC;SAAM,CAAC;QAEN,UAAU,CAAC,IAAI,CAAC,cAAc,IAAI,EAAE,CAAC,CAAC;QACtC,UAAU,CAAC,IAAI,CAAC,kBAAkB,IAAI,EAAE,CAAC,CAAC;QAC1C,UAAU,CAAC,IAAI,CAAC,mBAAmB,IAAI,EAAE,CAAC,CAAC;QAC3C,UAAU,CAAC,IAAI,CAAC,4BAA4B,IAAI,EAAE,CAAC,CAAC;IACtD,CAAC;IAGD,OAAO,CAAC,GAAG,IAAI,GAAG,CAAC,UAAU,CAAC,CAAC,CAAC;AAClC,CAAC;AAkBD,SAAgB,aAAa,CAAC,QAAgB;IAC5C,MAAM,UAAU,GAAG,iBAAiB,CAAC,QAAQ,CAAC,CAAC;IAC/C,MAAM,SAAS,GAAG,UAAU,CAAC,WAAW,EAAE,CAAC;IAG3C,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,IAAI,CAAC;IACd,CAAC;IAGD,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,IAAI,CAAC,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QACpE,OAAO,IAAI,CAAC;IACd,CAAC;IAGD,IAAI,SAAS,CAAC,QAAQ,CAAC,WAAW,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,eAAe,CAAC,EAAE,CAAC;QAC3E,OAAO,IAAI,CAAC;IACd,CAAC;IAID,OAAO,UAAU,KAAK,kBAAkB,CAAC;AAC3C,CAAC;AAqBD,SAAgB,oBAAoB,CAAC,QAAgB;IAEnD,OAAO,aAAa,CAAC,QAAQ,CAAC,CAAC;AACjC,CAAC;AAQD,SAAgB,yBAAyB,CAAC,QAAgB;IACxD,MAAM,UAAU,GAAG,iBAAiB,CAAC,QAAQ,CAAC,CAAC;IAC/C,MAAM,SAAS,GAAG,UAAU,CAAC,WAAW,EAAE,CAAC;IAE3C,IAAI,SAAS,CAAC,QAAQ,CAAC,iBAAiB,CAAC,EAAE,CAAC;QAC1C,OAAO,uDAAuD,CAAC;IACjE,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,iCAAiC,CAAC;IAC3C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,UAAU,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC;QACjE,OAAO,+BAA+B,CAAC;IACzC,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,QAAQ,CAAC,IAAI,UAAU,KAAK,kBAAkB,EAAE,CAAC;QACtE,OAAO,mCAAmC,CAAC;IAC7C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,OAAO,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,IAAI,SAAS,CAAC,QAAQ,CAAC,OAAO,CAAC,EAAE,CAAC;QAC7F,OAAO,yBAAyB,CAAC;IACnC,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC;QAC/B,OAAO,iCAAiC,CAAC;IAC3C,CAAC;IAED,IAAI,SAAS,CAAC,QAAQ,CAAC,SAAS,CAAC,EAAE,CAAC;QAClC,OAAO,uBAAuB,CAAC;IACjC,CAAC;IAED,OAAO,sBAAsB,CAAC;AAChC,CAAC"}
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "n8n-mcp",
-  "version": "2.37.1",
+  "version": "2.37.3",
  "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
  "main": "dist/index.js",
  "types": "dist/index.d.ts",
--- a/src/mcp/handlers-workflow-diff.ts
+++ b/src/mcp/handlers-workflow-diff.ts
@@ -31,6 +31,11 @@ function getValidator(repository: NodeRepository): WorkflowValidator {
  return cachedValidator;
 }

+// Operation types that identify nodes by nodeId/nodeName
+const NODE_TARGETING_OPERATIONS = new Set([
+  'updateNode', 'removeNode', 'moveNode', 'enableNode', 'disableNode'
+]);
+
 // Zod schema for the diff request
 const workflowDiffSchema = z.object({
  id: z.string(),
@@ -63,6 +68,23 @@ const workflowDiffSchema = z.object({
    settings: z.any().optional(),
    name: z.string().optional(),
    tag: z.string().optional(),
+    // Aliases: LLMs often use "id" instead of "nodeId" — accept both
+    id: z.string().optional(),
+  }).transform((op) => {
+    // Normalize common field aliases for node-targeting operations:
+    // - "name" → "nodeName" (LLMs confuse the updateName "name" field with node identification)
+    // - "id" → "nodeId" (natural alias)
+    if (NODE_TARGETING_OPERATIONS.has(op.type)) {
+      if (!op.nodeName && !op.nodeId && op.name) {
+        op.nodeName = op.name;
+        op.name = undefined;
+      }
+      if (!op.nodeId && op.id) {
+        op.nodeId = op.id;
+        op.id = undefined;
+      }
+    }
+    return op;
  })),
  validateOnly: z.boolean().optional(),
  continueOnError: z.boolean().optional(),
--- a/src/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.ts
+++ b/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'
--- a/src/services/n8n-validation.ts
+++ b/src/services/n8n-validation.ts
@@ -49,7 +49,7 @@ export const workflowConnectionSchema = z.record(
    ai_memory: connectionArraySchema.optional(),
    ai_embedding: connectionArraySchema.optional(),
    ai_vectorStore: connectionArraySchema.optional(),
-  })
+  }).catchall(connectionArraySchema) // Allow additional AI connection types (ai_outputParser, ai_document, ai_textSplitter, etc.)
 );

 export const workflowSettingsSchema = z.object({
@@ -248,15 +248,15 @@ 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;
-
+      // Iterate over ALL connection types present in the data — not a hardcoded list —
+      // so that every AI connection type (ai_outputParser, ai_document, ai_textSplitter,
+      // ai_agent, ai_chain, ai_retriever, etc.) is covered automatically.
      Object.entries(workflow.connections).forEach(([sourceName, connection]) => {
        connectedNodes.add(sourceName); // Node has outgoing connection

-        // Check all connection types for target nodes
-        ALL_CONNECTION_TYPES.forEach(connType => {
-          const connData = (connection as Record<string, unknown>)[connType];
+        // Check every connection type key present on this source node
+        const connectionRecord = connection as Record<string, unknown>;
+        Object.values(connectionRecord).forEach((connData) => {
          if (connData && Array.isArray(connData)) {
            connData.forEach((outputs) => {
              if (Array.isArray(outputs)) {
@@ -429,24 +429,29 @@ export function validateWorkflowStructure(workflow: Partial<Workflow>): string[]
        }
      }
      
-      if (connection.main && Array.isArray(connection.main)) {
-        connection.main.forEach((outputs, outputIndex) => {
-          if (Array.isArray(outputs)) {
-            outputs.forEach((target, targetIndex) => {
-              // Check if target exists by name (correct)
-              if (!nodeNames.has(target.node)) {
-                // Check if they're using an ID instead of name
-                if (nodeIds.has(target.node)) {
-                  const correctName = nodeIdToName.get(target.node);
-                  errors.push(`Connection target uses node ID '${target.node}' but must use node name '${correctName}' (from ${sourceName}[${outputIndex}][${targetIndex}])`);
-                } else {
-                  errors.push(`Connection references non-existent target node: ${target.node} (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+      // Check all connection types (main, error, ai_tool, ai_languageModel, etc.)
+      const connectionRecord = connection as Record<string, unknown>;
+      Object.values(connectionRecord).forEach((connData) => {
+        if (connData && Array.isArray(connData)) {
+          connData.forEach((outputs: any, outputIndex: number) => {
+            if (Array.isArray(outputs)) {
+              outputs.forEach((target: any, targetIndex: number) => {
+                if (!target?.node) return;
+                // Check if target exists by name (correct)
+                if (!nodeNames.has(target.node)) {
+                  // Check if they're using an ID instead of name
+                  if (nodeIds.has(target.node)) {
+                    const correctName = nodeIdToName.get(target.node);
+                    errors.push(`Connection target uses node ID '${target.node}' but must use node name '${correctName}' (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+                  } else {
+                    errors.push(`Connection references non-existent target node: ${target.node} (from ${sourceName}[${outputIndex}][${targetIndex}])`);
+                  }
                }
-              }
-            });
-          }
-        });
-      }
+              });
+            }
+          });
+        }
+      });
    });
  }

--- a/src/services/node-specific-validators.ts
+++ b/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',
--- a/src/services/workflow-auto-fixer.ts
+++ b/src/services/workflow-auto-fixer.ts
@@ -671,11 +671,13 @@ export class WorkflowAutoFixer {
    filteredFixes: FixOperation[],
    allFixes: FixOperation[]
  ): WorkflowDiffOperation[] {
+    // fixedNodes contains node names (FixOperation.node = node.name)
    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 || '');
+        // Check both nodeName and nodeId — operations may use either
+        return fixedNodes.has(op.nodeName || '') || fixedNodes.has(op.nodeId || '');
      }
      if (op.type === 'replaceConnections') {
        return hasConnectionFixes;
@@ -1186,10 +1188,11 @@ export class WorkflowAutoFixer {
          description: `Upgrade ${node.name} from v${currentVersion} to v${latestVersion}. ${analysis.reason}`
        });

-        // Create update operation
+        // Create update operation — both nodeId and nodeName needed for fix filtering
        const operation: UpdateNodeOperation = {
          type: 'updateNode',
          nodeId: node.id,
+          nodeName: node.name,
          updates: {
            typeVersion: parseFloat(latestVersion),
            parameters: migrationResult.updatedNode.parameters,
--- a/src/services/workflow-diff-engine.ts
+++ b/src/services/workflow-diff-engine.ts
@@ -1237,15 +1237,21 @@ export class WorkflowDiffEngine {
  private setNestedProperty(obj: any, path: string, value: any): void {
    const keys = path.split('.');
    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; // parent path doesn't exist, nothing to delete
        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;
+    }
  }
 }
--- a/tests/unit/mcp/handlers-workflow-diff.test.ts
+++ b/tests/unit/mcp/handlers-workflow-diff.test.ts
@@ -1001,5 +1001,122 @@ describe('handlers-workflow-diff', () => {
        expect(mockApiClient.updateWorkflowTags).not.toHaveBeenCalled();
      });
    });
+
+    describe('field name normalization', () => {
+      it('should normalize "name" to "nodeName" for updateNode operations', async () => {
+        const testWorkflow = createTestWorkflow();
+        const updatedWorkflow = { ...testWorkflow };
+
+        mockApiClient.getWorkflow.mockResolvedValue(testWorkflow);
+        mockDiffEngine.applyDiff.mockResolvedValue({
+          success: true,
+          workflow: updatedWorkflow,
+          operationsApplied: 1,
+          message: 'Success',
+          errors: [],
+        });
+        mockApiClient.updateWorkflow.mockResolvedValue(updatedWorkflow);
+
+        await handleUpdatePartialWorkflow({
+          id: 'test-workflow-id',
+          operations: [{
+            type: 'updateNode',
+            name: 'HTTP Request',  // LLMs often use "name" instead of "nodeName"
+            updates: { 'parameters.url': 'https://new-url.com' },
+          }],
+        }, mockRepository);
+
+        // Verify the diff engine received nodeName (normalized from name)
+        expect(mockDiffEngine.applyDiff).toHaveBeenCalled();
+        const diffArgs = mockDiffEngine.applyDiff.mock.calls[0][1];
+        expect(diffArgs.operations[0].nodeName).toBe('HTTP Request');
+      });
+
+      it('should normalize "id" to "nodeId" for removeNode operations', async () => {
+        const testWorkflow = createTestWorkflow();
+        const updatedWorkflow = { ...testWorkflow };
+
+        mockApiClient.getWorkflow.mockResolvedValue(testWorkflow);
+        mockDiffEngine.applyDiff.mockResolvedValue({
+          success: true,
+          workflow: updatedWorkflow,
+          operationsApplied: 1,
+          message: 'Success',
+          errors: [],
+        });
+        mockApiClient.updateWorkflow.mockResolvedValue(updatedWorkflow);
+
+        await handleUpdatePartialWorkflow({
+          id: 'test-workflow-id',
+          operations: [{
+            type: 'removeNode',
+            id: 'node2',  // LLMs may use "id" instead of "nodeId"
+          }],
+        }, mockRepository);
+
+        // Verify the diff engine received nodeId (normalized from id)
+        expect(mockDiffEngine.applyDiff).toHaveBeenCalled();
+        const diffArgs = mockDiffEngine.applyDiff.mock.calls[0][1];
+        expect(diffArgs.operations[0].nodeId).toBe('node2');
+      });
+
+      it('should NOT normalize "name" for updateName operations', async () => {
+        const testWorkflow = createTestWorkflow();
+        const updatedWorkflow = { ...testWorkflow };
+
+        mockApiClient.getWorkflow.mockResolvedValue(testWorkflow);
+        mockDiffEngine.applyDiff.mockResolvedValue({
+          success: true,
+          workflow: updatedWorkflow,
+          operationsApplied: 1,
+          message: 'Success',
+          errors: [],
+        });
+        mockApiClient.updateWorkflow.mockResolvedValue(updatedWorkflow);
+
+        await handleUpdatePartialWorkflow({
+          id: 'test-workflow-id',
+          operations: [{
+            type: 'updateName',
+            name: 'New Workflow Name',  // This is the correct field for updateName
+          }],
+        }, mockRepository);
+
+        // Verify "name" stays as "name" (not moved to nodeName) for updateName
+        expect(mockDiffEngine.applyDiff).toHaveBeenCalled();
+        const diffArgs = mockDiffEngine.applyDiff.mock.calls[0][1];
+        expect(diffArgs.operations[0].name).toBe('New Workflow Name');
+        expect(diffArgs.operations[0].nodeName).toBeUndefined();
+      });
+
+      it('should prefer explicit "nodeName" over "name" alias', async () => {
+        const testWorkflow = createTestWorkflow();
+        const updatedWorkflow = { ...testWorkflow };
+
+        mockApiClient.getWorkflow.mockResolvedValue(testWorkflow);
+        mockDiffEngine.applyDiff.mockResolvedValue({
+          success: true,
+          workflow: updatedWorkflow,
+          operationsApplied: 1,
+          message: 'Success',
+          errors: [],
+        });
+        mockApiClient.updateWorkflow.mockResolvedValue(updatedWorkflow);
+
+        await handleUpdatePartialWorkflow({
+          id: 'test-workflow-id',
+          operations: [{
+            type: 'updateNode',
+            nodeName: 'HTTP Request',  // Explicit nodeName provided
+            name: 'Should Be Ignored',  // Should NOT override nodeName
+            updates: { 'parameters.url': 'https://new-url.com' },
+          }],
+        }, mockRepository);
+
+        expect(mockDiffEngine.applyDiff).toHaveBeenCalled();
+        const diffArgs = mockDiffEngine.applyDiff.mock.calls[0][1];
+        expect(diffArgs.operations[0].nodeName).toBe('HTTP Request');
+      });
+    });
  });
 });
--- a/tests/unit/services/n8n-validation.test.ts
+++ b/tests/unit/services/n8n-validation.test.ts
@@ -1096,6 +1096,83 @@ describe('n8n-validation', () => {
        expect(disconnectedErrors).toHaveLength(0);
      });

+      it('should NOT flag nodes as disconnected when connected via ai_outputParser', () => {
+        const workflow = {
+          name: 'AI Output Parser 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: 'parser-1',
+              name: 'Structured Output Parser',
+              type: '@n8n/n8n-nodes-langchain.outputParserStructured',
+              typeVersion: 1,
+              position: [300, 400] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'Structured Output Parser': {
+              ai_outputParser: [[{ node: 'AI Agent', type: 'ai_outputParser', 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_document or ai_textSplitter', () => {
+        const workflow = {
+          name: 'Document Processing Workflow',
+          nodes: [
+            {
+              id: 'vs-1',
+              name: 'Pinecone Vector Store',
+              type: '@n8n/n8n-nodes-langchain.vectorStorePinecone',
+              typeVersion: 1,
+              position: [500, 300] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'doc-1',
+              name: 'Default Data Loader',
+              type: '@n8n/n8n-nodes-langchain.documentDefaultDataLoader',
+              typeVersion: 1,
+              position: [300, 400] as [number, number],
+              parameters: {},
+            },
+            {
+              id: 'splitter-1',
+              name: 'Text Splitter',
+              type: '@n8n/n8n-nodes-langchain.textSplitterRecursiveCharacterTextSplitter',
+              typeVersion: 1,
+              position: [100, 400] as [number, number],
+              parameters: {},
+            },
+          ],
+          connections: {
+            'Default Data Loader': {
+              ai_document: [[{ node: 'Pinecone Vector Store', type: 'ai_document', index: 0 }]],
+            },
+            'Text Splitter': {
+              ai_textSplitter: [[{ node: 'Default Data Loader', type: 'ai_textSplitter', 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',
--- a/tests/unit/services/node-specific-validators.test.ts
+++ b/tests/unit/services/node-specific-validators.test.ts
@@ -1912,6 +1912,55 @@ return [{"json": {"result": result}}]
        });
      });

+      it('should not error on primitive return inside helper functions', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'function isValid(item) { return false; }\nconst items = $input.all();\nreturn items.filter(isValid).map(i => ({json: i.json}));'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        const primitiveErrors = context.errors.filter(e => e.message === 'Cannot return primitive values directly');
+        expect(primitiveErrors).toHaveLength(0);
+      });
+
+      it('should not error on primitive return inside arrow function helpers', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'const isValid = (item) => { return false; };\nreturn $input.all().filter(isValid).map(i => ({json: i.json}));'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        const primitiveErrors = context.errors.filter(e => e.message === 'Cannot return primitive values directly');
+        expect(primitiveErrors).toHaveLength(0);
+      });
+
+      it('should not error on primitive return inside async function helpers', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'async function fetchData(url) { return null; }\nconst data = await fetchData("https://api.example.com");\nreturn [{json: {data}}];'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        const primitiveErrors = context.errors.filter(e => e.message === 'Cannot return primitive values directly');
+        expect(primitiveErrors).toHaveLength(0);
+      });
+
+      it('should still error on primitive return without helper functions', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'return "success";'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        expect(context.errors).toContainEqual(expect.objectContaining({
+          message: 'Cannot return primitive values directly'
+        }));
+      });
+
      it('should error on Python primitive return', () => {
        context.config = {
          language: 'python',
@@ -2038,6 +2087,30 @@ return [{"json": {"result": result}}]
        });
      });

+      it('should not warn about $() node reference syntax', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'const data = $("Previous Node").first().json;\nreturn [{json: data}];'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        const dollarWarnings = context.warnings.filter(w => w.message === 'Invalid $ usage detected');
+        expect(dollarWarnings).toHaveLength(0);
+      });
+
+      it('should not warn about $_ variables', () => {
+        context.config = {
+          language: 'javaScript',
+          jsCode: 'const $_temp = 1;\nreturn [{json: {value: $_temp}}];'
+        };
+
+        NodeSpecificValidators.validateCode(context);
+
+        const dollarWarnings = context.warnings.filter(w => w.message === 'Invalid $ usage detected');
+        expect(dollarWarnings).toHaveLength(0);
+      });
+
      it('should correct helpers usage', () => {
        context.config = {
          language: 'javaScript',
--- a/tests/unit/services/workflow-diff-engine.test.ts
+++ b/tests/unit/services/workflow-diff-engine.test.ts
@@ -4882,4 +4882,111 @@ describe('WorkflowDiffEngine', () => {
      expect(result.workflow.connections['Source Node']['main'][0][0].type).toBe('main');
    });
  });
+
+  describe('null value property deletion', () => {
+    it('should delete a property when value is null', async () => {
+      const node = baseWorkflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      (node as any).continueOnFail = true;
+
+      const operation: UpdateNodeOperation = {
+        type: 'updateNode',
+        nodeName: 'HTTP Request',
+        updates: { continueOnFail: null }
+      };
+
+      const request: WorkflowDiffRequest = {
+        id: 'test-workflow',
+        operations: [operation]
+      };
+
+      const result = await diffEngine.applyDiff(baseWorkflow, request);
+
+      expect(result.success).toBe(true);
+      const updatedNode = result.workflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      expect('continueOnFail' in updatedNode).toBe(false);
+    });
+
+    it('should delete a nested property when value is null', async () => {
+      const node = baseWorkflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      (node as any).parameters = { url: 'https://example.com', authentication: 'basic' };
+
+      const operation: UpdateNodeOperation = {
+        type: 'updateNode',
+        nodeName: 'HTTP Request',
+        updates: { 'parameters.authentication': null }
+      };
+
+      const request: WorkflowDiffRequest = {
+        id: 'test-workflow',
+        operations: [operation]
+      };
+
+      const result = await diffEngine.applyDiff(baseWorkflow, request);
+
+      expect(result.success).toBe(true);
+      const updatedNode = result.workflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      expect((updatedNode as any).parameters.url).toBe('https://example.com');
+      expect('authentication' in (updatedNode as any).parameters).toBe(false);
+    });
+
+    it('should set property normally when value is not null', async () => {
+      const operation: UpdateNodeOperation = {
+        type: 'updateNode',
+        nodeName: 'HTTP Request',
+        updates: { continueOnFail: true }
+      };
+
+      const request: WorkflowDiffRequest = {
+        id: 'test-workflow',
+        operations: [operation]
+      };
+
+      const result = await diffEngine.applyDiff(baseWorkflow, request);
+
+      expect(result.success).toBe(true);
+      const updatedNode = result.workflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      expect((updatedNode as any).continueOnFail).toBe(true);
+    });
+
+    it('should be a no-op when deleting a non-existent property', async () => {
+      const node = baseWorkflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      const originalKeys = Object.keys(node).sort();
+
+      const operation: UpdateNodeOperation = {
+        type: 'updateNode',
+        nodeName: 'HTTP Request',
+        updates: { nonExistentProp: null }
+      };
+
+      const request: WorkflowDiffRequest = {
+        id: 'test-workflow',
+        operations: [operation]
+      };
+
+      const result = await diffEngine.applyDiff(baseWorkflow, request);
+
+      expect(result.success).toBe(true);
+      const updatedNode = result.workflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      expect('nonExistentProp' in updatedNode).toBe(false);
+    });
+
+    it('should skip intermediate object creation when deleting from non-existent parent path', async () => {
+      const operation: UpdateNodeOperation = {
+        type: 'updateNode',
+        nodeName: 'HTTP Request',
+        updates: { 'nonExistent.deeply.nested.prop': null }
+      };
+
+      const request: WorkflowDiffRequest = {
+        id: 'test-workflow',
+        operations: [operation]
+      };
+
+      const result = await diffEngine.applyDiff(baseWorkflow, request);
+
+      expect(result.success).toBe(true);
+      const updatedNode = result.workflow.nodes.find((n: any) => n.name === 'HTTP Request')!;
+      expect('nonExistent' in updatedNode).toBe(false);
+    });
+  });
 });