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MCP- N8N

by fellipesaraiva88
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update-tag

Modify a tag's name in the MCP-N8N server by specifying the client ID, tag ID, and new name to ensure accurate labeling and organization.

Instructions

Update a tag's name.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
clientIdYes
idYes
nameYes

Implementation Reference

  • src/index.ts:1790-1820 (handler)
    MCP tool execution handler for 'update-tag'. Retrieves the N8nClient by clientId, validates it exists, calls client.updateTag(id, name), and returns success or error response.
    case "update-tag": {
  const { clientId, id, name } = args as { clientId: string; id: string; name: 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.updateTag(id, name);
    return {
      content: [{
        type: "text",
        text: `Successfully updated tag:\n${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:770-782 (schema)
    Input schema for the 'update-tag' tool, defined in the ListTools response. Requires clientId, id, and name.
    {
  name: "update-tag",
  description: "Update a tag's name.",
  inputSchema: {
    type: "object",
    properties: {
      clientId: { type: "string" },
      id: { type: "string" },
      name: { type: "string" }
    },
    required: ["clientId", "id", "name"]
  }
},
  • src/index.ts:397-851 (registration)
    The ListToolsRequestSchema handler registers the 'update-tag' tool by including it in the tools array returned.
    server.setRequestHandler(ListToolsRequestSchema, async () => {
  return {
    tools: [
      {
        name: "init-n8n",
        description: "Initialize connection to n8n instance. Use this tool whenever an n8n URL and API key are shared to establish the connection. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            url: { type: "string" },
            apiKey: { type: "string" }
          },
          required: ["url", "apiKey"]
        }
      },
      {
        name: "list-workflows",
        description: "List all workflows from n8n. Use after init-n8n to see available workflows. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "get-workflow",
        description: "Retrieve a workflow by ID. Use after list-workflows to get detailed information about a specific workflow. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "create-workflow",
        description: "Create a new workflow in n8n. Use to set up a new workflow with optional nodes and connections. IMPORTANT: 1) Arguments must be provided as compact, single-line JSON without whitespace or newlines. 2) Must provide full workflow structure including nodes and connections arrays, even if empty. The 'active' property should not be included as it is read-only.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            name: { type: "string" },
            nodes: { type: "array" },
            connections: { type: "object" }
          },
          required: ["clientId", "name"]
        }
      },
      {
        name: "update-workflow",
        description: "Update an existing workflow in n8n. Use after get-workflow to modify a workflow's properties, nodes, or connections. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" },
            workflow: {
              type: "object",
              properties: {
                name: { type: "string" },
                active: { type: "boolean" },
                nodes: { type: "array" },
                connections: { type: "object" },
                settings: { type: "object" }
              }
            }
          },
          required: ["clientId", "id", "workflow"]
        }
      },
      {
        name: "delete-workflow",
        description: "Delete a workflow by ID. This action cannot be undone. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "activate-workflow",
        description: "Activate a workflow by ID. This will enable the workflow to run. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "deactivate-workflow",
        description: "Deactivate a workflow by ID. This will prevent the workflow from running. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "list-projects",
        description: "List all projects from n8n. NOTE: Requires n8n Enterprise license with project management features enabled. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "create-project",
        description: "Create a new project in n8n. NOTE: Requires n8n Enterprise license with project management features enabled. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            name: { type: "string" }
          },
          required: ["clientId", "name"]
        }
      },
      {
        name: "delete-project",
        description: "Delete a project by ID. NOTE: Requires n8n Enterprise license with project management features enabled. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            projectId: { type: "string" }
          },
          required: ["clientId", "projectId"]
        }
      },
      {
        name: "update-project",
        description: "Update a project's name. NOTE: Requires n8n Enterprise license with project management features enabled. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            projectId: { type: "string" },
            name: { type: "string" }
          },
          required: ["clientId", "projectId", "name"]
        }
      },
      {
        name: "list-users",
        description: "Retrieve all users from your instance. Only available for the instance owner.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "create-users",
        description: "Create one or more users in your instance.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            users: {
              type: "array",
              items: {
                type: "object",
                properties: {
                  email: { type: "string" },
                  role: { 
                    type: "string",
                    enum: ["global:admin", "global:member"]
                  }
                },
                required: ["email"]
              }
            }
          },
          required: ["clientId", "users"]
        }
      },
      {
        name: "get-user",
        description: "Get user by ID or email address.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            idOrEmail: { type: "string" }
          },
          required: ["clientId", "idOrEmail"]
        }
      },
      {
        name: "delete-user",
        description: "Delete a user from your instance.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            idOrEmail: { type: "string" }
          },
          required: ["clientId", "idOrEmail"]
        }
      },
      {
        name: "list-variables",
        description: "List all variables from n8n. NOTE: Requires n8n Enterprise license with variable management features enabled. Use after init-n8n to see available variables. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "create-variable",
        description: "Create a new variable in n8n. NOTE: Requires n8n Enterprise license with variable management features enabled. Variables can be used across workflows to store and share data. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            key: { type: "string" },
            value: { type: "string" }
          },
          required: ["clientId", "key", "value"]
        }
      },
      {
        name: "delete-variable",
        description: "Delete a variable by ID. NOTE: Requires n8n Enterprise license with variable management features enabled. Use after list-variables to get the ID of the variable to delete. This action cannot be undone. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "create-credential",
        description: "Create a credential that can be used by nodes of the specified type. The credential type name can be found in the n8n UI when creating credentials (e.g., 'cloudflareApi', 'githubApi', 'slackOAuth2Api'). Use get-credential-schema first to see what fields are required for the credential type you want to create.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            name: { type: "string" },
            type: { type: "string" },
            data: { type: "object" }
          },
          required: ["clientId", "name", "type", "data"]
        }
      },
      {
        name: "delete-credential",
        description: "Delete a credential by ID. You must be the owner of the credentials.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "get-credential-schema",
        description: "Show credential data schema for a specific credential type. The credential type name can be found in the n8n UI when creating credentials (e.g., 'cloudflareApi', 'githubApi', 'slackOAuth2Api'). This will show you what fields are required for creating credentials of this type.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            credentialTypeName: { type: "string" }
          },
          required: ["clientId", "credentialTypeName"]
        }
      },
      // Execution Management Tools
      {
        name: "list-executions",
        description: "Retrieve all executions from your instance with optional filtering.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            includeData: { type: "boolean" },
            status: { 
              type: "string",
              enum: ["error", "success", "waiting"]
            },
            workflowId: { type: "string" },
            limit: { type: "number" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "get-execution",
        description: "Retrieve a specific execution by ID.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "number" },
            includeData: { type: "boolean" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "delete-execution",
        description: "Delete a specific execution by ID.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "number" }
          },
          required: ["clientId", "id"]
        }
      },
      // Tag Management Tools
      {
        name: "create-tag",
        description: "Create a new tag in your instance.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            name: { type: "string" }
          },
          required: ["clientId", "name"]
        }
      },
      {
        name: "list-tags",
        description: "Retrieve all tags from your instance.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            limit: { type: "number" }
          },
          required: ["clientId"]
        }
      },
      {
        name: "get-tag",
        description: "Retrieve a specific tag by ID.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "update-tag",
        description: "Update a tag's name.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" },
            name: { type: "string" }
          },
          required: ["clientId", "id", "name"]
        }
      },
      {
        name: "delete-tag",
        description: "Delete a tag by ID.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            id: { type: "string" }
          },
          required: ["clientId", "id"]
        }
      },
      {
        name: "get-workflow-tags",
        description: "Get tags associated with a workflow.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            workflowId: { type: "string" }
          },
          required: ["clientId", "workflowId"]
        }
      },
      {
        name: "update-workflow-tags",
        description: "Update tags associated with a workflow.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            workflowId: { type: "string" },
            tagIds: {
              type: "array",
              items: {
                type: "object",
                properties: {
                  id: { type: "string" }
                },
                required: ["id"]
              }
            }
          },
          required: ["clientId", "workflowId", "tagIds"]
        }
      },
      // Security Audit Tool
      {
        name: "generate-audit",
        description: "Generate a security audit for your n8n instance.",
        inputSchema: {
          type: "object",
          properties: {
            clientId: { type: "string" },
            daysAbandonedWorkflow: { type: "number" },
            categories: {
              type: "array",
              items: {
                type: "string",
                enum: ["credentials", "database", "nodes", "filesystem", "instance"]
              }
            }
          },
          required: ["clientId"]
        }
      }
    ]
  };
});
  • src/index.ts:317-322 (helper)
    N8nClient.updateTag method: Makes a PUT request to /tags/{id} with new name, implementing the core update logic.
    async updateTag(id: string, name: string): Promise<N8nTag> {
  return this.makeRequest<N8nTag>(`/tags/${id}`, {
    method: 'PUT',
    body: JSON.stringify({ name }),
  });
}

Tool Definition Quality

C2.8/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool updates a tag's name, implying a mutation, but doesn't address permissions, side effects, error conditions, or response format. This is inadequate for a mutation tool with zero annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero wasted words. It's appropriately sized and front-loaded, directly stating the tool's purpose without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (a mutation with 3 required parameters), lack of annotations, and no output schema, the description is incomplete. It doesn't explain parameter roles, behavioral traits, or expected outcomes, making it insufficient for safe and effective use by an agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate for undocumented parameters. It only mentions 'name' as the field to update, ignoring 'clientId' and 'id' parameters entirely. This leaves two required parameters semantically unexplained, failing to add meaningful value beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Update') and the resource ('a tag's name'), providing a specific verb+resource combination. However, it doesn't distinguish this tool from sibling tools like 'update-project' or 'update-workflow' beyond the resource type, which prevents a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing an existing tag ID), exclusions, or comparisons to sibling tools like 'create-tag' or 'delete-tag', leaving the agent without contextual usage instructions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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