Function startMCPServer

src/entrypoints/mcp.ts:35–196

(
  cwd: string,
  debug: boolean,
  verbose: boolean,
)

const MCP_COMMANDS: Command[] = [review]

export async function startMCPServer(
  cwd: string,
  debug: boolean,
  verbose: boolean,
): Promise<void> {
  // Use size-limited LRU cache for readFileState to prevent unbounded memory growth
  // 100 files and 25MB limit should be sufficient for MCP server operations
  const READ_FILE_STATE_CACHE_SIZE = 100
  const readFileStateCache = createFileStateCacheWithSizeLimit(
    READ_FILE_STATE_CACHE_SIZE,
  )
  setCwd(cwd)
  const server = new Server(
    {
      name: 'claude/tengu',
      version: MACRO.VERSION,
    },
    {
      capabilities: {
        tools: {},
      },
    },
  )

  server.setRequestHandler(
    ListToolsRequestSchema,
    async (): Promise<ListToolsResult> => {
      // TODO: Also re-expose any MCP tools
      const toolPermissionContext = getEmptyToolPermissionContext()
      const tools = getTools(toolPermissionContext)
      return {
        tools: await Promise.all(
          tools.map(async tool => {
            let outputSchema: ToolOutput | undefined
            if (tool.outputSchema) {
              const convertedSchema = zodToJsonSchema(tool.outputSchema)
              // MCP SDK requires outputSchema to have type: "object" at root level
              // Skip schemas with anyOf/oneOf at root (from z.union, z.discriminatedUnion, etc.)
              // See: https://github.com/anthropics/claude-code/issues/8014
              if (
                typeof convertedSchema === 'object' &&
                convertedSchema !== null &&
                'type' in convertedSchema &&
                convertedSchema.type === 'object'
              ) {
                outputSchema = convertedSchema as ToolOutput
              }
            }
            return {
              ...tool,
              description: await tool.prompt({
                getToolPermissionContext: async () => toolPermissionContext,
                tools,
                agents: [],
              }),
              inputSchema: zodToJsonSchema(tool.inputSchema) as ToolInput,
              outputSchema,
            }