Three tools with basic schemas and descriptions, but significant gaps in parameter documentation and error handling. health_check and get_app_metadata have minimal descriptions (under 50 chars). fetch_reviews has a longer description but lacks parameter-level guidance on date format validation, error recovery, and output structure. No tool documents its return schema explicitly. Error handling is generic (returns dict with 'error' or 'status' keys) without actionable recovery guidance. No tool annotations (readOnlyHint/destructiveHint) despite clear risk profiles. Parameter descriptions exist but are sparse, e.g., 'lang' and 'country' lack examples or constraints. Overall: functional but below production baseline.

• Expand health_check description to 50-100 chars explaining its purpose: 'Check if the Play Store scraper service is running and ready to fetch reviews. Returns status and current phase.'
• Add explicit output schema documentation to fetch_reviews: 'Returns {status: string, cache_dir: string (path to local cache), reviews_fetched: integer, truncated: boolean}. If error, returns {status: 'error', message: string}.'
• Add tool annotations via FastMCP: @mcp.tool() with readOnlyHint=True for health_check and get_app_metadata; @mcp.tool() with destructiveHint=True for fetch_reviews (writes to cache).
• Enhance error messages with recovery guidance: 'Invalid app_id: {app_id}. Verify the app exists on Google Play Store. Try searching for the app name first.' Include error classification (retryable vs user-fixable).
• Constrain 'lang' and 'country' parameters: add enum or pattern. E.g., lang: 'ISO 639-1 code (e.g., en, es, fr)'; country: 'ISO 3166-1 alpha-2 code (e.g., in, us, gb)'. Or use enums if only a subset is supported.