Solid filesystem tool suite with complete schemas and consistent descriptions. All 6 tools have proper JSON Schema definitions with typed parameters and descriptions. Tool names follow verb_noun convention (ls, readFile, writeFile, mkdir, rename, rm). Descriptions are concise (10-30 chars) but lack depth on WHEN to use each tool and what happens on error. Parameters are well-typed with enums for encoding. Critical gap: no output schema documentation, no error recovery guidance, and descriptions are below the 50-200 char LLM-optimized baseline. Security is strong (path traversal protection via safe() function), but error messages are generic ('ok' responses lack context).

• Expand tool descriptions to 50-200 chars. Example: 'ls: List files and directories in a folder. Returns name, type (file|dir), size, and modification time. Use this to explore the project structure before reading or writing files.' This tells LLMs WHAT, WHEN, and WHAT to expect.
• Document output schemas in tool definitions. Add a 'returns' field or update descriptions: 'readFile returns the file contents as a string (utf8) or base64-encoded string. Specify encoding parameter to control format.'
• Enhance error messages with recovery guidance. Instead of returning String(e), catch specific errors: 'Path escapes project root. Use a relative path within ' + ROOT + '. Example: ./src/file.txt' or 'File not found. Check the path and try ls() to list available files.'
• Add destructiveHint annotations to rm and writeFile (overwrite mode). Include a confirmation pattern: 'This operation is destructive. Confirm by passing confirm: true parameter, or use a dry-run first.' This prevents accidental data loss.
• Clarify path handling in parameter descriptions. Add: 'path: Relative path from project root (FS_ROOT env var, default cwd). Must not escape root. Symlinks are followed. Absolute paths are rejected.'