Trace MCP

Instructions

Implementation Reference

• src/index.ts:285-309 (handler)

  MCP CallToolRequest handler case for 'extract_schemas' tool: validates input with Zod schema, invokes extractProducerSchemas, logs progress, and returns JSON result with extracted schemas.
  case 'extract_schemas': { const input = ExtractSchemasInput.parse(args); log(`Extracting schemas from: ${input.rootDir}`); const schemas = await extractProducerSchemas({ rootDir: input.rootDir, include: input.include, exclude: input.exclude, }); log(`Found ${schemas.length} tool definitions`); return { content: [ { type: 'text', text: JSON.stringify({ success: true, count: schemas.length, schemas, }, null, 2), }, ], }; }
• src/index.ts:45-49 (schema)

  Zod input schema validation for the 'extract_schemas' tool parameters.
  const ExtractSchemasInput = z.object({ rootDir: z.string().describe('Root directory of MCP server source code'), include: z.array(z.string()).optional().describe('Glob patterns to include (default: **/*.ts)'), exclude: z.array(z.string()).optional().describe('Glob patterns to exclude (default: node_modules, dist)'), });
• src/index.ts:130-142 (registration)

  Tool registration in ListToolsResponse: defines name, description, and inputSchema for 'extract_schemas'.
  { name: 'extract_schemas', description: 'Extract MCP tool definitions (ProducerSchemas) from server source code. Scans for server.tool() calls and parses their Zod schemas.', inputSchema: { type: 'object', properties: { rootDir: { type: 'string', description: 'Root directory of MCP server source code' }, include: { type: 'array', items: { type: 'string' }, description: 'Glob patterns to include' }, exclude: { type: 'array', items: { type: 'string' }, description: 'Glob patterns to exclude' }, }, required: ['rootDir'], }, },
• src/extract/index.ts:24-44 (helper)

  Core extraction logic: selects language parser (defaults to TypeScript) and delegates schema extraction to parser.extractSchemas.
  export async function extractProducerSchemas( options: ExtractorOptions ): Promise<ProducerSchema[]> { // For backward compatibility, default to TypeScript const language = options.language || 'typescript'; // Get parser from registry if (!hasParser(language)) { throw new Error( `No parser available for language: ${language}. Make sure to call bootstrapLanguageParsers() at startup.` ); } const parser = getParser(language); return parser.extractSchemas({ rootDir: options.rootDir, include: options.include, exclude: options.exclude, }); }