n8n MCP Server

Instructions

Implementation Reference

• src/index.ts:1526-1556 (handler)

  MCP server tool handler for 'delete-credential'. Validates client, calls N8nClient.deleteCredential(id), and returns success or error response.

  case "delete-credential": {
    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 result = await client.deleteCredential(id);
      return {
        content: [{
          type: "text",
          text: `Successfully deleted credential:\n${JSON.stringify(result, null, 2)}`,
        }]
      };
    } catch (error) {
      return {
        content: [{
          type: "text",
          text: error instanceof Error ? error.message : "Unknown error occurred",
        }],
        isError: true
      };
    }
  }

• src/index.ts:369-373 (helper)

  N8nClient method implementing the delete credential API call via DELETE /credentials/{id}.

  async deleteCredential(id: string): Promise<any> {
    return this.makeRequest(`/credentials/${id}`, {
      method: 'DELETE',
    });
  }

• src/index.ts:665-676 (registration)

  Tool registration in the ListTools response, defining name, description, and input schema requiring clientId and id.

  {
    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"]
    }
  },

• src/index.ts:668-675 (schema)

  Input schema for delete-credential tool, specifying clientId and credential id as required string parameters.

  inputSchema: {
    type: "object",
    properties: {
      clientId: { type: "string" },
      id: { type: "string" }
    },
    required: ["clientId", "id"]
  }