The server has 4 well-intentioned tools with adequate naming (verb_noun pattern observed: ping, list_files, read_text_file, fetch_json) and documented input schemas. However, critical gaps remain: tool descriptions lack consistency and depth, parameter descriptions are sparse or missing entirely, output schemas are not documented anywhere, and error handling guidance is minimal. The codebase shows good internal engineering (validation, logging, error classes) but does not expose this quality to the agent interface. STDIO transport caps protocol readiness at 50 regardless. For definitionQuality, this averages to 58 due to moderate naming (+70), weak descriptions (+50), weak schemas (+55), and weak error handling (+50).

• Document output schema for each tool in the MCP definition. For list_files, specify: 'Returns a list of file/directory objects, each with: {"name": string, "type": "file"|"directory", "size": number (bytes)}'. For read_text_file, state: 'Returns the file contents as a UTF-8 string.' For fetch_json, state: 'Returns the parsed JSON response as an object (structure depends on the API endpoint).'
• Expand tool descriptions to 50-200 chars with context on WHEN to use and WHAT the tool does. Example: 'List all files and directories in the sandbox. Use this first to discover available content before reading specific files. Returns file metadata including name and type.'
• Add tool annotations to the MCP schema (readOnlyHint: true for all tools) so agents understand safe retry semantics.
• Add limit and offset parameters to list_files to support pagination, with sensible defaults (limit=20, offset=0) and a max of 1000. Document: 'For sandboxes with many files, use limit and offset to paginate results.'
• Enhance error messages in fetch_json to include recovery hints. Example: 'Invalid URL scheme. Supported schemes: http, https.' or 'Request timed out after {timeout}s. Try increasing timeout or checking network connectivity.'
• Add minLength and maxLength constraints to string parameters for input validation. Example: path minLength=1, maxLength=2048; url maxLength=8192.
• Document parameter dependencies and edge cases. Example: 'If path does not exist, returns empty list. If path is a file, raises NotADirectoryError.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry