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Resolve GitHub Issue 292 in n8n-mcp (#375)
* docs: add comprehensive documentation for removing node properties with undefined Add detailed documentation section for property removal pattern in n8n_update_partial_workflow tool: - New "Removing Properties with undefined" section explaining the pattern - Examples showing basic, nested, and batch property removal - Migration guide for deprecated properties (continueOnFail → onError) - Best practices for when to use undefined - Pitfalls to avoid (null vs undefined, mutual exclusivity, etc.) This addresses the documentation gap reported in issue #292 where users were confused about how to remove properties during node updates. Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * fix: correct array property removal documentation in n8n_update_partial_workflow (Issue #292) Fixed critical documentation error showing array index notation [0] which doesn't work. The setNestedProperty implementation treats "headers[0]" as a literal object key, not an array index. Changes: - Updated nested property removal section to show entire array removal - Corrected example rm5 to use "parameters.headers" instead of "parameters.headers[0]" - Replaced misleading pitfall with accurate warning about array index notation not being supported Impact: - Prevents user confusion and non-functional code - All examples now show correct, working patterns - Clear warning helps users avoid this mistake Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>
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Romuald Członkowski
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@@ -186,7 +186,115 @@ Please choose a different name.
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- Simply rename nodes with updateNode - no manual connection operations needed
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- Multiple renames in one call work atomically
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- Can rename a node and add/remove connections using the new name in the same batch
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- Use \`validateOnly: true\` to preview effects before applying`,
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- Use \`validateOnly: true\` to preview effects before applying
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## Removing Properties with undefined
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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.
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### Why Use undefined?
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- **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
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- **Validation constraints**: Some properties are mutually exclusive (e.g., \`continueOnFail\` and \`onError\`). Simply setting one without removing the other will fail validation
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- **Deprecated property migration**: When n8n deprecates properties, you must remove the old property before the new one will work
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### Basic Property Removal
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\`\`\`javascript
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// Remove error handling configuration
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n8n_update_partial_workflow({
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id: "wf_123",
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operations: [{
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type: "updateNode",
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nodeName: "HTTP Request",
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updates: { onError: undefined }
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}]
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});
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// Remove disabled flag
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n8n_update_partial_workflow({
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id: "wf_456",
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operations: [{
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type: "updateNode",
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nodeId: "node_abc",
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updates: { disabled: undefined }
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}]
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});
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\`\`\`
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### Nested Property Removal
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Use dot notation to remove nested properties:
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\`\`\`javascript
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// Remove nested parameter
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n8n_update_partial_workflow({
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id: "wf_789",
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operations: [{
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type: "updateNode",
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nodeName: "API Request",
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updates: { "parameters.authentication": undefined }
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}]
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});
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// Remove entire array property
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n8n_update_partial_workflow({
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id: "wf_012",
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operations: [{
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type: "updateNode",
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nodeName: "HTTP Request",
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updates: { "parameters.headers": undefined }
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}]
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});
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\`\`\`
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### Migrating from Deprecated Properties
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Common scenario: replacing \`continueOnFail\` with \`onError\`:
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\`\`\`javascript
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// WRONG: Setting only the new property leaves the old one
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n8n_update_partial_workflow({
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id: "wf_123",
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operations: [{
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type: "updateNode",
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nodeName: "HTTP Request",
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updates: { onError: "continueErrorOutput" }
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}]
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});
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// Error: continueOnFail and onError are mutually exclusive
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// CORRECT: Remove the old property first
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n8n_update_partial_workflow({
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id: "wf_123",
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operations: [{
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type: "updateNode",
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nodeName: "HTTP Request",
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updates: {
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continueOnFail: undefined,
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onError: "continueErrorOutput"
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}
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}]
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});
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\`\`\`
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### Batch Property Removal
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Remove multiple properties in one operation:
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\`\`\`javascript
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n8n_update_partial_workflow({
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id: "wf_345",
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operations: [{
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type: "updateNode",
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nodeName: "Data Processor",
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updates: {
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continueOnFail: undefined,
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alwaysOutputData: undefined,
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"parameters.legacy_option": undefined
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}
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}]
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});
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\`\`\`
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### When to Use undefined
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- Removing deprecated properties during migration
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- Cleaning up optional configuration flags
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- Resolving mutual exclusivity validation errors
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- Removing stale or unnecessary node metadata
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- Simplifying node configuration`,
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parameters: {
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id: { type: 'string', required: true, description: 'Workflow ID to update' },
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operations: {
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@@ -223,7 +331,13 @@ Please choose a different name.
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'// Vector Store setup: Connect embeddings and documents\nn8n_update_partial_workflow({id: "ai7", operations: [\n {type: "addConnection", source: "Embeddings OpenAI", target: "Pinecone Vector Store", sourceOutput: "ai_embedding"},\n {type: "addConnection", source: "Default Data Loader", target: "Pinecone Vector Store", sourceOutput: "ai_document"}\n]})',
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'// Connect Vector Store Tool to AI Agent (retrieval setup)\nn8n_update_partial_workflow({id: "ai8", operations: [\n {type: "addConnection", source: "Pinecone Vector Store", target: "Vector Store Tool", sourceOutput: "ai_vectorStore"},\n {type: "addConnection", source: "Vector Store Tool", target: "AI Agent", sourceOutput: "ai_tool"}\n]})',
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'// 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"}]})',
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'// 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]})'
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'// 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]})',
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'\n// ============ REMOVING PROPERTIES EXAMPLES ============',
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'// Remove a simple property\nn8n_update_partial_workflow({id: "rm1", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {onError: undefined}}]})',
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'// Migrate from deprecated continueOnFail to onError\nn8n_update_partial_workflow({id: "rm2", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {continueOnFail: undefined, onError: "continueErrorOutput"}}]})',
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'// Remove nested property\nn8n_update_partial_workflow({id: "rm3", operations: [{type: "updateNode", nodeName: "API Request", updates: {"parameters.authentication": undefined}}]})',
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'// Remove multiple properties\nn8n_update_partial_workflow({id: "rm4", operations: [{type: "updateNode", nodeName: "Data Processor", updates: {continueOnFail: undefined, alwaysOutputData: undefined, "parameters.legacy_option": undefined}}]})',
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'// Remove entire array property\nn8n_update_partial_workflow({id: "rm5", operations: [{type: "updateNode", nodeName: "HTTP Request", updates: {"parameters.headers": undefined}}]})'
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],
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useCases: [
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'Rewire connections when replacing nodes',
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@@ -259,7 +373,11 @@ Please choose a different name.
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'Connect language model BEFORE adding AI Agent to ensure validation passes',
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'Use targetIndex for fallback models (primary=0, fallback=1)',
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'Batch AI component connections in a single operation for atomicity',
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'Validate AI workflows after connection changes to catch configuration errors'
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'Validate AI workflows after connection changes to catch configuration errors',
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'To remove properties, set them to undefined (not null) in the updates object',
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'When migrating from deprecated properties, remove the old property and add the new one in the same operation',
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'Use undefined to resolve mutual exclusivity validation errors between properties',
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'Batch multiple property removals in a single updateNode operation for efficiency'
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],
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pitfalls: [
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'**REQUIRES N8N_API_URL and N8N_API_KEY environment variables** - will not work without n8n API access',
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@@ -279,7 +397,12 @@ Please choose a different name.
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'**Auto-sanitization behavior**: Binary operators (equals, contains) automatically have singleValue removed; unary operators (isEmpty, isNotEmpty) automatically get singleValue:true added',
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'**Auto-sanitization runs on ALL nodes**: When ANY update is made, ALL nodes in the workflow are sanitized (not just modified ones)',
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'**Auto-sanitization cannot fix everything**: It fixes operator structures and missing metadata, but cannot fix broken connections or branch mismatches',
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'**Corrupted workflows beyond repair**: Workflows in paradoxical states (API returns corrupt, API rejects updates) cannot be fixed via API - must be recreated'
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'**Corrupted workflows beyond repair**: Workflows in paradoxical states (API returns corrupt, API rejects updates) cannot be fixed via API - must be recreated',
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'Setting a property to null does NOT remove it - use undefined instead',
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'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',
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'Removing a required property may cause validation errors - check node documentation first',
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'Nested property removal with dot notation only removes the specific nested field, not the entire parent object',
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'Array index notation (e.g., "parameters.headers[0]") is not supported - remove the entire array property instead'
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],
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relatedTools: ['n8n_update_full_workflow', 'n8n_get_workflow', 'validate_workflow', 'tools_documentation']
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}
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