Trace MCP

Instructions

Implementation Reference

• src/tools/scaffold.ts:35-79 (handler)

  Core handler function that generates consumer code (functions, hooks, etc.) from a producer schema based on the specified target format.
  export function scaffoldConsumerFromProducer( producer: ProducerSchema, options: ScaffoldOptions = { target: 'typescript' } ): ScaffoldResult { const { target, includeErrorHandling = true, includeTypes = true, functionPrefix = '', includeJSDoc = true } = options; const toolName = producer.toolName; const functionName = `${functionPrefix}${toCamelCase(toolName)}`; const inputProps = producer.inputSchema.properties || {}; const requiredArgs = producer.inputSchema.required || []; // Generate TypeScript interface for args const argsInterface = generateArgsInterface(toolName, inputProps, requiredArgs); // Generate the function based on target let code: string; let types: string | undefined; let example: string; switch (target) { case 'react-hook': ({ code, types, example } = generateReactHook(toolName, functionName, inputProps, requiredArgs, { includeErrorHandling, includeTypes, includeJSDoc, producer })); break; case 'zustand-action': ({ code, types, example } = generateZustandAction(toolName, functionName, inputProps, requiredArgs, { includeErrorHandling, includeTypes, includeJSDoc, producer })); break; case 'javascript': const jsResult = generateJavaScript(toolName, functionName, inputProps, requiredArgs, { includeErrorHandling, includeJSDoc, producer }); code = jsResult.code; example = jsResult.example; types = undefined; break; case 'typescript': default: ({ code, types, example } = generateTypeScript(toolName, functionName, inputProps, requiredArgs, { includeErrorHandling, includeTypes, includeJSDoc, producer })); break; } return { code, suggestedFilename: `use-${toKebabCase(toolName)}.${target === 'javascript' ? 'js' : 'ts'}`, types, example, }; }
• src/index.ts:73-79 (schema)

  Zod input schema for validating arguments to the scaffold_consumer tool.
  const ScaffoldConsumerInput = z.object({ producerDir: z.string().describe('Path to MCP server source directory'), toolName: z.string().describe('Name of the tool to scaffold consumer for'), target: z.enum(['typescript', 'javascript', 'react-hook', 'zustand-action']).optional().describe('Output target format (default: typescript)'), includeErrorHandling: z.boolean().optional().describe('Include try/catch error handling (default: true)'), includeTypes: z.boolean().optional().describe('Include TypeScript type definitions (default: true)'), });
• src/index.ts:193-207 (registration)

  Registration of the 'scaffold_consumer' tool in the MCP server's listTools response, defining name, description, and input schema.
  { name: 'scaffold_consumer', description: 'Generate consumer code from a producer schema. Creates TypeScript functions, React hooks, or Zustand actions that correctly call MCP tools.', inputSchema: { type: 'object', properties: { producerDir: { type: 'string', description: 'Path to MCP server source directory' }, toolName: { type: 'string', description: 'Name of the tool to scaffold consumer for' }, target: { type: 'string', enum: ['typescript', 'javascript', 'react-hook', 'zustand-action'], description: 'Output target format' }, includeErrorHandling: { type: 'boolean', description: 'Include try/catch error handling' }, includeTypes: { type: 'boolean', description: 'Include TypeScript type definitions' }, }, required: ['producerDir', 'toolName'], }, },
• src/index.ts:405-442 (handler)

  MCP server request handler case for 'scaffold_consumer': parses input, extracts producer schema, invokes core scaffold function, and formats response.
  case 'scaffold_consumer': { const input = ScaffoldConsumerInput.parse(args); log(`Scaffolding consumer for tool: ${input.toolName}`); // Extract producer schemas to find the requested tool const producers = await extractProducerSchemas({ rootDir: input.producerDir }); const producer = producers.find(p => p.toolName === input.toolName); if (!producer) { throw new Error(`Tool "${input.toolName}" not found in ${input.producerDir}`); } const result = scaffoldConsumerFromProducer(producer, { target: input.target || 'typescript', includeErrorHandling: input.includeErrorHandling ?? true, includeTypes: input.includeTypes ?? true, includeJSDoc: true, }); log(`Generated ${input.target || 'typescript'} consumer code`); return { content: [ { type: 'text', text: JSON.stringify({ success: true, toolName: input.toolName, target: input.target || 'typescript', suggestedFilename: result.suggestedFilename, code: result.code, types: result.types, example: result.example, }, null, 2), }, ], }; }