This GitHub MCP server provides 9 tools with explicit schemas and descriptions in Go/mcp-go. All tools have descriptions (in Japanese) and registered schemas via mcp.NewTool(). However, there are systematic gaps: (1) descriptions are terse and lack actionable context for LLM selection; (2) no output schemas are documented anywhere in the source; (3) array parameter 'files' in push_files lacks item-type specification; (4) no error handling guidance visible; (5) no mention of pagination limits for search_repositories; (6) parameters lack format/constraint details (e.g., branch names, file paths); (7) descriptions are in Japanese, reducing clarity for non-Japanese-speaking LLM operators. The tool naming is consistently strong (verb_noun pattern, e.g., 'search_repositories', 'create_pull_request'). Schemas are present but incomplete, every tool has required/non-required flags, but no numeric bounds, enums, or item schemas for arrays. The 'files' array in push_files is a critical gap: LLMs cannot infer the structure of array items without documentation.

• Add explicit output schemas for every tool. Document as a JSON Schema in code comments or a separate schema file. Example for create_repository: {repo_id: string, owner: string, name: string, url: string, private: boolean}.
• Expand descriptions to 100 - 200 characters. Include: WHAT does it do? WHEN should I call it vs similar tools? WHAT IDs/refs do I need first? Example: 'Create a new GitHub repository. Requires authentication. Returns repo_id needed for subsequent file/PR operations. Limit 1 repo per minute; use batch tools for bulk operations.'
• Translate descriptions to English (or provide both). Japanese descriptions are inaccessible to most LLM operators and reduce discoverability.
• Add item schema to 'files' array in push_files. Document the expected structure: [{operation: 'create'|'update'|'delete', path: string, content?: string, sha?: string}]. Include example.
• Add pagination bounds: search_repositories per_page default 20, max 100. Add total_count and next_cursor to response schema so LLMs know when to paginate.
• Document error responses for each tool. Map common GitHub API errors to actionable guidance. E.g., 'Repository not found (404). Check owner/repo names are correct. Call search_repositories() to find the repo.'
• Add confirmation pattern to create_repository and fork_repository. Either support a 'dry_run' parameter or require explicit confirmation parameter to prevent accidental state changes.
• Convert free-form parameters to enums where appropriate. E.g., create_pull_request_review 'event': enum ['APPROVE', 'REQUEST_CHANGES', 'COMMENT'].