n8n-workflow-tester-safe

Instructions

Implementation Reference

• src/n8n-client.ts:130-135 (handler)

  The core implementation function that adds a node to a workflow by fetching the workflow, appending the node to the nodes array, and updating the workflow via n8n API.

  export async function addNodeToWorkflow(workflowId: string, node: Record<string, unknown>) {
    const workflow = await getWorkflow(workflowId);
    const nodes = Array.isArray(workflow.nodes) ? workflow.nodes : [];
    workflow.nodes = [...nodes, node];
    return await updateWorkflow(workflowId, workflow);
  }

• src/index.ts:77-84 (registration)

  Tool registration defining the tool name, description, and input schema with workflowId (string) and node (object) as required parameters.

    name: 'add_node_to_workflow',
    description: 'Append a node JSON object to an existing workflow.',
    inputSchema: {
      type: 'object',
      properties: { workflowId: { type: 'string' }, node: { type: 'object' } },
      required: ['workflowId', 'node'],
    },
  },

• src/index.ts:240-244 (handler)

  Request handler that validates input arguments using Zod schema, calls the addNodeToWorkflow function, and returns the result as JSON text.

  if (name === 'add_node_to_workflow') {
    const { workflowId, node } = z.object({ workflowId: z.string(), node: z.record(z.unknown()) }).parse(args);
    const updated = await addNodeToWorkflow(workflowId, node);
    return { content: [{ type: 'text', text: JSON.stringify(updated, null, 2) }] };
  }