feat(v2.7.0): add n8n_update_partial_workflow with transactional updates
BREAKING CHANGES: - Renamed n8n_update_workflow to n8n_update_full_workflow for clarity NEW FEATURES: - Added n8n_update_partial_workflow tool for diff-based workflow editing - Implemented WorkflowDiffEngine with 13 operation types - Added transactional updates with two-pass processing - Maximum 5 operations per request for reliability - Operations can be in any order - engine handles dependencies - Added validateOnly mode for testing changes before applying - 80-90% token savings by only sending changes IMPROVEMENTS: - Enhanced tool description with comprehensive parameter documentation - Added clear examples for simple and complex use cases - Improved error messages and validation - Added extensive test coverage for all operations DOCUMENTATION: - Added workflow-diff-examples.md with usage patterns - Added transactional-updates-example.md showing before/after - Updated README.md with v2.7.0 features - Updated CLAUDE.md with latest changes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
145
src/mcp/handlers-workflow-diff.ts
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145
src/mcp/handlers-workflow-diff.ts
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/**
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* MCP Handler for Partial Workflow Updates
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* Handles diff-based workflow modifications
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*/
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import { z } from 'zod';
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import { McpToolResponse } from '../types/n8n-api';
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import { WorkflowDiffRequest, WorkflowDiffOperation } from '../types/workflow-diff';
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import { WorkflowDiffEngine } from '../services/workflow-diff-engine';
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import { getN8nApiClient } from './handlers-n8n-manager';
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import { N8nApiError, getUserFriendlyErrorMessage } from '../utils/n8n-errors';
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import { logger } from '../utils/logger';
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// Zod schema for the diff request
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const workflowDiffSchema = z.object({
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id: z.string(),
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operations: z.array(z.object({
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type: z.string(),
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description: z.string().optional(),
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// Node operations
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node: z.any().optional(),
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nodeId: z.string().optional(),
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nodeName: z.string().optional(),
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changes: z.any().optional(),
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position: z.tuple([z.number(), z.number()]).optional(),
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// Connection operations
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source: z.string().optional(),
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target: z.string().optional(),
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sourceOutput: z.string().optional(),
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targetInput: z.string().optional(),
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sourceIndex: z.number().optional(),
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targetIndex: z.number().optional(),
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// Metadata operations
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settings: z.any().optional(),
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name: z.string().optional(),
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tag: z.string().optional(),
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})),
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validateOnly: z.boolean().optional(),
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});
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export async function handleUpdatePartialWorkflow(args: unknown): Promise<McpToolResponse> {
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try {
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// Debug: Log what Claude Desktop sends
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logger.info('[DEBUG] Full args from Claude Desktop:', JSON.stringify(args, null, 2));
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logger.info('[DEBUG] Args type:', typeof args);
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if (args && typeof args === 'object') {
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logger.info('[DEBUG] Args keys:', Object.keys(args as any));
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}
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// Validate input
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const input = workflowDiffSchema.parse(args);
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// Get API client
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const client = getN8nApiClient();
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if (!client) {
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return {
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success: false,
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error: 'n8n API not configured. Please set N8N_API_URL and N8N_API_KEY environment variables.'
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};
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}
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// Fetch current workflow
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let workflow;
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try {
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workflow = await client.getWorkflow(input.id);
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} catch (error) {
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if (error instanceof N8nApiError) {
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return {
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success: false,
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error: getUserFriendlyErrorMessage(error),
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code: error.code
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};
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}
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throw error;
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}
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// Apply diff operations
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const diffEngine = new WorkflowDiffEngine();
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const diffResult = await diffEngine.applyDiff(workflow, input as WorkflowDiffRequest);
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if (!diffResult.success) {
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return {
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success: false,
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error: 'Failed to apply diff operations',
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details: {
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errors: diffResult.errors,
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operationsApplied: diffResult.operationsApplied
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}
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};
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}
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// If validateOnly, return validation result
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if (input.validateOnly) {
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return {
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success: true,
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message: diffResult.message,
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data: {
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valid: true,
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operationsToApply: input.operations.length
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}
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};
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}
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// Update workflow via API
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try {
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const updatedWorkflow = await client.updateWorkflow(input.id, diffResult.workflow!);
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return {
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success: true,
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data: updatedWorkflow,
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message: `Workflow "${updatedWorkflow.name}" updated successfully. Applied ${diffResult.operationsApplied} operations.`,
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details: {
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operationsApplied: diffResult.operationsApplied,
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workflowId: updatedWorkflow.id,
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workflowName: updatedWorkflow.name
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}
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};
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} catch (error) {
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if (error instanceof N8nApiError) {
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return {
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success: false,
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error: getUserFriendlyErrorMessage(error),
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code: error.code,
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details: error.details as Record<string, unknown> | undefined
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};
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}
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throw error;
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}
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} catch (error) {
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if (error instanceof z.ZodError) {
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return {
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success: false,
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error: 'Invalid input',
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details: { errors: error.errors }
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};
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}
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logger.error('Failed to update partial workflow', error);
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return {
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success: false,
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error: error instanceof Error ? error.message : 'Unknown error occurred'
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};
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}
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}
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@@ -23,6 +23,7 @@ import { TemplateService } from '../templates/template-service';
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import { WorkflowValidator } from '../services/workflow-validator';
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import { isN8nApiConfigured } from '../config/n8n-api';
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import * as n8nHandlers from './handlers-n8n-manager';
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import { handleUpdatePartialWorkflow } from './handlers-workflow-diff';
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interface NodeRow {
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node_type: string;
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@@ -236,8 +237,10 @@ export class N8NDocumentationMCPServer {
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return n8nHandlers.handleGetWorkflowStructure(args);
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case 'n8n_get_workflow_minimal':
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return n8nHandlers.handleGetWorkflowMinimal(args);
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case 'n8n_update_workflow':
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case 'n8n_update_full_workflow':
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return n8nHandlers.handleUpdateWorkflow(args);
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case 'n8n_update_partial_workflow':
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return handleUpdatePartialWorkflow(args);
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case 'n8n_delete_workflow':
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return n8nHandlers.handleDeleteWorkflow(args);
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case 'n8n_list_workflows':
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@@ -125,8 +125,8 @@ export const n8nManagementTools: ToolDefinition[] = [
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}
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},
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{
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name: 'n8n_update_workflow',
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description: `Update an existing workflow. Requires the full nodes array when modifying nodes/connections. Cannot activate workflows via API - use UI instead.`,
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name: 'n8n_update_full_workflow',
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description: `Update an existing workflow with complete replacement. Requires the full nodes array and connections object when modifying workflow structure. Use n8n_update_partial_workflow for incremental changes. Cannot activate workflows via API - use UI instead.`,
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inputSchema: {
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type: 'object',
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properties: {
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@@ -154,6 +154,135 @@ export const n8nManagementTools: ToolDefinition[] = [
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required: ['id']
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}
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},
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{
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name: 'n8n_update_partial_workflow',
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description: `Update a workflow using diff operations for precise, incremental changes. More efficient than n8n_update_full_workflow for small modifications. Supports adding/removing/updating nodes and connections without sending the entire workflow.
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PARAMETERS:
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• id (required) - Workflow ID to update
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• operations (required) - Array of operations to apply (max 5)
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• validateOnly (optional) - Test operations without applying (default: false)
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TRANSACTIONAL UPDATES (v2.7.0+):
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• Maximum 5 operations per request for reliability
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• Two-pass processing: nodes first, then connections/metadata
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• Add nodes and connect them in the same request
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• Operations can be in any order - engine handles dependencies
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IMPORTANT NOTES:
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• Operations are atomic - all succeed or all fail
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• Use validateOnly: true to test before applying
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• Node references use NAME, not ID (except in node definition)
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• updateNode with nested paths: use dot notation like "parameters.values[0]"
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• All nodes require: id, name, type, typeVersion, position, parameters
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OPERATION TYPES:
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addNode - Add a new node
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Required: node object with id, name, type, typeVersion, position, parameters
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Example: {
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type: "addNode",
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node: {
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id: "unique_id",
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name: "HTTP Request",
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type: "n8n-nodes-base.httpRequest",
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typeVersion: 4.2,
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position: [400, 300],
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parameters: { url: "https://api.example.com", method: "GET" }
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}
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}
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removeNode - Remove node by name
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Required: nodeName or nodeId
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Example: {type: "removeNode", nodeName: "Old Node"}
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updateNode - Update node properties
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Required: nodeName, changes
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Example: {type: "updateNode", nodeName: "Webhook", changes: {"parameters.path": "/new-path"}}
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moveNode - Change node position
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Required: nodeName, position
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Example: {type: "moveNode", nodeName: "Set", position: [600, 400]}
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enableNode/disableNode - Toggle node status
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Required: nodeName
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Example: {type: "disableNode", nodeName: "Debug"}
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addConnection - Connect nodes
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Required: source, target
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Optional: sourceOutput (default: "main"), targetInput (default: "main"),
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sourceIndex (default: 0), targetIndex (default: 0)
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Example: {
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type: "addConnection",
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source: "Webhook",
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target: "Set",
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sourceOutput: "main", // for nodes with multiple outputs
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targetInput: "main" // for nodes with multiple inputs
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}
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removeConnection - Disconnect nodes
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Required: source, target
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Optional: sourceOutput, targetInput
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Example: {type: "removeConnection", source: "Set", target: "HTTP Request"}
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updateSettings - Change workflow settings
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Required: settings object
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Example: {type: "updateSettings", settings: {executionOrder: "v1", timezone: "Europe/Berlin"}}
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updateName - Rename workflow
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Required: name
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Example: {type: "updateName", name: "New Workflow Name"}
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addTag/removeTag - Manage tags
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Required: tag
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Example: {type: "addTag", tag: "production"}
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EXAMPLES:
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Simple update:
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operations: [
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{type: "updateName", name: "My Updated Workflow"},
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{type: "disableNode", nodeName: "Debug Node"}
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]
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Complex example - Add nodes and connect (any order works):
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operations: [
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{type: "addConnection", source: "Webhook", target: "Format Date"},
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{type: "addNode", node: {id: "abc123", name: "Format Date", type: "n8n-nodes-base.dateTime", typeVersion: 2, position: [400, 300], parameters: {}}},
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{type: "addConnection", source: "Format Date", target: "Logger"},
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{type: "addNode", node: {id: "def456", name: "Logger", type: "n8n-nodes-base.n8n", typeVersion: 1, position: [600, 300], parameters: {}}}
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]
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Validation example:
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{
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id: "workflow-id",
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operations: [{type: "addNode", node: {...}}],
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validateOnly: true // Test without applying
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}`,
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inputSchema: {
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type: 'object',
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additionalProperties: true, // Allow any extra properties Claude Desktop might add
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properties: {
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id: {
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type: 'string',
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description: 'Workflow ID to update'
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},
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operations: {
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type: 'array',
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description: 'Array of diff operations to apply. Each operation must have a "type" field and relevant properties for that operation type.',
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items: {
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type: 'object',
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additionalProperties: true
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}
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},
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validateOnly: {
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type: 'boolean',
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description: 'If true, only validate operations without applying them'
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}
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},
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required: ['id', 'operations']
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}
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},
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{
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name: 'n8n_delete_workflow',
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description: `Permanently delete a workflow. This action cannot be undone.`,
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