n8n MCP Server

Instructions

Implementation Reference

• src/tools/credentials.ts:151-181 (handler)

  The registration and handler implementation for the n8n_update_credential tool. It uses a patch request to update the credential.

    server.registerTool(
      'n8n_update_credential',
      {
        title: 'Update n8n Credential',
        description: `Update an existing credential.
  
  Args:
    - id (string): Credential ID to update
    - name (string, optional): New credential name
    - data (object, optional): Updated credential data
  
  Returns:
    The updated credential (without sensitive data).`,
        inputSchema: UpdateCredentialSchema,
        annotations: {
          readOnlyHint: false,
          destructiveHint: false,
          idempotentHint: true,
          openWorldHint: false
        }
      },
      async (params: z.infer<typeof UpdateCredentialSchema>) => {
        const { id, ...updateData } = params;
        const credential = await patch<N8nCredential>(`/credentials/${id}`, updateData);
        
        return {
          content: [{ type: 'text', text: `✅ Credential updated!\n\n${formatCredential(credential)}` }],
          structuredContent: credential
        };
      }
    );

• src/tools/credentials.ts:7-12 (schema)

  The schema definition import for the UpdateCredential tool.

    UpdateCredentialSchema,
    ListCredentialsSchema,
    CredentialSchemaRequestSchema,
    IdParamSchema,
    TransferToProjectSchema
  } from '../schemas/index.js';