MCP File System

Implementation Reference

• src/index.ts:174-181 (registration)

  Registers the 'list_allowed_directories' tool. The handler resolves the command-line provided allowed directories and returns them as a newline-separated list in a standardized MCP response format. Schema is empty (no input params).

  server.tool(
      "list_allowed_directories",
      {},
      async () => {
          const resolvedDirs = allowedDirs.map(dir => path.resolve(dir));
          return { content: [{ type: 'text', text: resolvedDirs.join('\n') }] };
      }
  );

• src/index.ts:7-11 (helper)

  Defines the 'allowedDirs' array from command-line arguments (process.argv.slice(2)) and exits with error if none provided. This is used by the tool handler.

  const allowedDirs = process.argv.slice(2);
  if (allowedDirs.length === 0) {
      console.error('Error: No directories specified. Please provide at least one directory path.');
      process.exit(1);
  }