Two tools with basic schemas and descriptions, but significant gaps in parameter documentation and output schema clarity. Tool names lack action verbs (wakatime_summaries, wakatime_today are noun-heavy). Descriptions are present but minimal (Japanese text, ~50-80 chars). Parameter descriptions exist but lack format constraints, ranges, and validation guidance. No documented output schema. Error handling is minimal, API errors are raised as generic RuntimeError with no recovery guidance. No tool annotations (readOnlyHint, etc.). Composition is reasonable (two distinct read-only operations), but parameter naming could be clearer (e.g., 'timezone' vs 'tz' inconsistency in implementation).

• Rename tools to verb_noun pattern: 'get_wakatime_summaries' and 'get_wakatime_today'. This signals retrieval intent to LLMs and aligns with 90% of production tools.
• Expand parameter descriptions with format and validation rules: 'start (YYYY-MM-DD, required, must be <= end date, max 365 days in past)' and 'timezone (IANA timezone string, e.g. Asia/Tokyo, UTC; defaults to Asia/Tokyo if omitted)'.
• Document output schema in tool description: 'Returns JSON object with data array. Each element contains: grand_total (object with total_seconds), projects (array of {name, total_seconds}), range (object with date, start, end).'
• Implement error categorization in wakatime_get(): catch Net::HTTPUnauthorized → 'Invalid or missing WAKATIME_API_KEY'; Net::HTTPBadRequest → parse body and return 'Invalid date range: start must be <= end'; Net::HTTPTooManyRequests → 'Rate limited; retry after 60 seconds'.
• Add readOnlyHint annotation to both tools in server.rb: `annotation :readOnly, true` to signal idempotency and safety to agents.