MCP Template

Instructions

Implementation Reference

• src/core/MCPServer.ts:223-229 (handler)

  The handler for the 'update_record' tool. Validates input using UpdateRecordArgsSchema and calls this.dataService.updateRecord to perform the update.

  case 'update_record': {
    return await safeExecute(toolName, async () => {
      const args = validateInput(UpdateRecordArgsSchema, request.params.arguments);
      const record = await this.dataService.updateRecord(args.resourceUri, args.recordId, args.data);
      return record;
    });
  }

• src/core/MCPServer.ts:154-157 (registration)

  Registration of the 'update_record' tool in the list_tools handler, including name, description, and input schema reference.

    name: 'update_record',
    description: 'Update a record in a resource',
    inputSchema: getInputSchema(UpdateRecordArgsSchema),
  },

• src/types/index.ts:87-91 (schema)

  Zod schema defining the input arguments for the update_record tool: resourceUri, recordId, and data.

  export const UpdateRecordArgsSchema = z.object({
    resourceUri: z.string().describe('URI of the resource'),
    recordId: z.string().describe('ID of the record to update'),
    data: z.record(z.unknown()).describe('New record data'),
  });

• src/examples/services/InMemoryDataService.ts:155-178 (helper)

  Implementation of the updateRecord method in the InMemoryDataService, which is called by the tool handler to perform the actual record update in memory.

  public async updateRecord(
    uri: string, 
    id: string, 
    data: Record<string, unknown>
  ): Promise<Record<string, unknown>> {
    this.validateResource(uri);
    
    const resourceData = this.data.get(uri)!;
    const existingRecord = resourceData.get(id);
    
    if (!existingRecord) {
      throw new Error(`Record not found: ${id}`);
    }
    
    const updatedRecord = {
      ...existingRecord,
      ...data,
      id, // Ensure ID doesn't change
      updatedAt: new Date().toISOString()
    };
    
    resourceData.set(id, updatedRecord);
    return updatedRecord;
  }