Single tool with decent naming and schema structure, but significant gaps in descriptions, parameter documentation, output schema visibility, and error handling. The tool name 'get-pull-request-data' is clear and verb-prefixed, following naming conventions. However, parameter descriptions are minimal (owner: 'GitHub repository owner' is 27 chars, acceptable but bare), and the optional token parameter exposes a credential as a tool parameter, a critical security violation. No documented output schema, no pagination support despite potentially large result sets, and error handling merely returns error text without recovery guidance. The helper functions fetch reviews but don't include them in the return type (getAllPullRequestInfo returns {details, diff, comments} but not reviews), indicating incomplete implementation.

• Move GitHub token to server-side configuration (environment variable or vault) and remove 'token' parameter from tool definition. Initialize Octokit once at startup with the injected token.
• Document the output schema explicitly in code comments and in tool description. Specify that response contains {details: PullRequestDetails, diff: string, comments: Comment[]}. Include sample field names and types an LLM should expect.
• Add pagination support: accept optional 'page' (default 1) and 'limit' (default 20, max 100) parameters. Return {results, page, limit, total_count, has_next} to allow LLMs to fetch subsequent pages.
• Fix getAllPullRequestInfo to include reviews in the return object. Either add reviews to the response or update the tool description to remove 'and reviews' from the promise.
• Enhance error handling with actionable guidance. For 'Not Found', return 'Pull request not found. Verify owner and repo exist and PR number is correct.' For rate limits, return 'API rate limited. Try again in 60 seconds.' For auth errors, return 'Invalid or missing GitHub credentials.'
• Add per-parameter constraints in descriptions: 'owner: GitHub org/user name (1-39 chars, alphanumeric and hyphens)'; 'pullNumber: positive integer, typically 1 - 10000'; 'token: optional GitHub PAT with repo:read scope (if provided; else uses default token)'.
• Cap the number of comments returned (e.g., first 50) and include a 'has_more_comments' flag. Large PRs with hundreds of comments would overflow context.