n8n-workflow-builder-mcp

const { describe, it, expect } = require('@jest/globals'); const { validateAndNormalizeWorkflow, SimpleNodeTypes } = require('../../dist/validation/workflowValidator.js'); function makeRegistry() { const reg = new SimpleNodeTypes(); reg.register('n8n-nodes-base.webhook', 2.1, { name: 'Webhook', properties: [] }); reg.register('@n8n/n8n-nodes-langchain.toolVectorStore', 1, { name: 'Vector QA Tool', properties: [] }); reg.register('n8n-nodes-base.set', 3.4, { name: 'Set', properties: [] }); return reg; } describe('Start node inference prefers webhook over AI-only tool', () => { it('chooses webhook as start even if tool appears first in nodes array', () => { const nodeTypes = makeRegistry(); const wf = { name: 'DUMMY_START_WEBHOOK', nodes: [ { id: 'tool-1', name: 'Vector QA', type: '@n8n/n8n-nodes-langchain.toolVectorStore', typeVersion: 1, parameters: {} }, { id: 'webhook-1', name: 'Webhook (input)', type: 'n8n-nodes-base.webhook', typeVersion: 2.1, parameters: {} }, { id: 'set-1', name: 'Prepare', type: 'n8n-nodes-base.set', typeVersion: 3.4, parameters: {} } ], connections: { 'Webhook (input)': { main: [ [{ node: 'Prepare', type: 'main', index: 0 }] ] } } }; const report = validateAndNormalizeWorkflow(wf, nodeTypes); expect(report.startNode).toBe('Webhook (input)'); }); it('fallback prefers head nodes that have outgoing main when no trigger present', () => { const reg = new SimpleNodeTypes(); reg.register('dummy.node', 1, { name: 'Dummy', properties: [] }); const wf = { name: 'DUMMY_FALLBACK', nodes: [ { id: 'a', name: 'A', type: 'dummy.node', typeVersion: 1, parameters: {} }, { id: 'b', name: 'B', type: 'dummy.node', typeVersion: 1, parameters: {} }, { id: 'c', name: 'C', type: 'dummy.node', typeVersion: 1, parameters: {} } ], connections: { A: { main: [[{ node: 'B', type: 'main', index: 0 }]] } } }; const report = validateAndNormalizeWorkflow(wf, reg); expect(report.startNode).toBe('A'); }); });