MCP- N8N

Instructions

Implementation Reference

• src/index.ts:1758-1788 (handler)

  Primary MCP tool handler for 'get-tag'. Retrieves the N8nClient by clientId, calls getTag(id), formats response as JSON or error.

  case "get-tag": {
    const { clientId, id } = args as { clientId: string; id: string };
    const client = clients.get(clientId);
    if (!client) {
      return {
        content: [{
          type: "text",
          text: "Client not initialized. Please run init-n8n first.",
        }],
        isError: true
      };
    }
  
    try {
      const tag = await client.getTag(id);
      return {
        content: [{
          type: "text",
          text: JSON.stringify(tag, null, 2),
        }]
      };
    } catch (error) {
      return {
        content: [{
          type: "text",
          text: error instanceof Error ? error.message : "Unknown error occurred",
        }],
        isError: true
      };
    }
  }

• src/index.ts:313-315 (helper)

  N8nClient helper method implementing the core logic: API GET request to /tags/{id}.

  async getTag(id: string): Promise<N8nTag> {
    return this.makeRequest<N8nTag>(`/tags/${id}`);
  }

• src/index.ts:759-769 (registration)

  Tool registration entry in ListTools response, defining name, description, and input schema.

    name: "get-tag",
    description: "Retrieve a specific tag by ID.",
    inputSchema: {
      type: "object",
      properties: {
        clientId: { type: "string" },
        id: { type: "string" }
      },
      required: ["clientId", "id"]
    }
  },

• src/index.ts:79-84 (schema)

  TypeScript interface defining the structure of a N8nTag object used in getTag response.

  interface N8nTag {
    id: string;
    name: string;
    createdAt?: string;
    updatedAt?: string;
  }