Single tool 'check_repo_health' has a comprehensive, well-written description (380+ chars) that clearly states WHAT it does, WHEN to use it, and prerequisites. Input schema is properly defined with Zod, both parameters have descriptions. However, output schema is NOT documented, the tool returns JSON.stringify(result) but the structure of 'result' is never defined in the visible code. Error handling is present and actionable (distinguishes GithubNotFoundError, GithubApiError with rate-limit guidance). Tool naming follows verb_noun pattern. Main gap: no documented output schema, which prevents LLMs from planning downstream operations or extracting specific fields reliably.

• Document the output schema explicitly. Add a TypeScript interface or JSON Schema comment showing the structure: { score: number (0-100), verdict: string, reasoning: string, metrics: {...} }. This enables LLMs to extract and chain results.
• Enhance input validation error messages. Instead of 'must be valid GitHub path segments', return: 'Invalid owner: must be 1-39 alphanumeric chars, hyphens, or underscores. Got: "<actual_value>"'. This guides LLM self-correction.
• Add a note in the tool description about rate limits and retry behavior. E.g., 'Unauthenticated GitHub API: 60 requests/hour/IP. If rate-limited, the error includes reset time; retry after that window.'
• Consider adding a 'timeout' parameter or documenting the expected response time. Agents need to know if this call might hang or if it's guaranteed fast.
• Migrate from STDIO to HTTP+SSE or Streamable HTTP transport to enable remote deployment and integration with hosted MCP clients.