Good foundation with 19 well-defined tools across GitHub's core APIs (issues, PRs, repos, search). All tools have descriptions (10-200 chars) and proper JSON Schema inputs with typed parameters and enums. However, output schemas are undocumented, the server provides no schema definitions for tool responses, forcing LLMs to infer structure. Error handling lacks recovery guidance. Several tools accept array parameters (assignees, labels) without batch operation consolidation. The 'hello' test tool is unnecessary in production. Tool naming follows verb_noun pattern consistently (get_*, create_*, search_*, list_*, update_*). Parameter descriptions are present but often generic; many lack constraints on format/range. Missing: documented output types, error recovery paths, rate-limit guidance, and dry-run/confirmation for destructive ops.

• Document output schemas for all tools. For list_issues, return: [{ issue_number, title, state, body, assignees, labels, created_at, updated_at, url }] and indicate total_count or next_page_url for pagination.
• Add error case documentation to each tool description. Example: 'Errors: Returns 404 if issue not found (try search_issues first), 403 if no permission to view, 422 if invalid state transition.'
• Implement dry-run or confirmation for destructive ops. Example: add optional 'dry_run' param (boolean, default false). When true, return what would happen without executing. For merge_pull_request, require explicit 'confirm=true' param to prevent accidental merges.
• Standardize parameter naming: rename 'pullNumber' to 'pull_number' in all PR tools for consistency with issue_number. This matches Arcade pattern:tool-naming.
• Add search_code batch variant or extend tools accepting arrays to clarify batching behavior. Document: 'To apply 5 labels to multiple issues, call update_issue once per issue with labels array. Consider future batch_update_issues for high-volume operations.'
• Remove or feature-gate 'hello' test tool. If needed for diagnostics, gate behind MCP_ENABLE_DEBUG_TOOLS env var.
• For search tools (search_issues, search_code, search_repositories, search_users), clarify pagination limits. Document: 'Results are capped at 100 per page; GitHub API enforces this limit. Use page param to fetch beyond first 100 results. For >1000 results, GitHub search may time out, narrow query scope.'