inboxfewer demonstrates above-average definition quality with 23 tools covering Google Calendar, Docs, and Drive integrations. Strengths: all tools have clear, action-based names (verb_noun pattern); descriptions are substantive (100-250 chars typical); input parameters include types and descriptions; account/resource ID parameters are consistently named. Weaknesses: output schemas are not documented in the source code; no error handling guidance visible; destructive operations (delete_events, delete_files) lack confirmation patterns; several parameters could benefit from enum constraints (eventType, role, format) but are documented as free-form strings; tool descriptions lack explicit 'WHEN to use this vs similar tools' guidance (e.g., difference between calendar_list_events and calendar_get_events). Per-tool analysis shows strong consistency across the 23 tools, but absence of visible output schema definitions and error recovery guidance prevents a higher score.

• Document output schemas for all 23 tools. For each, specify return type (object/array), fields, types, and descriptions. Example: calendar_create_event should return { eventId: string, calendarId: string, summary: string, start: string, end: string, ... }.
• Add error handling guidance to tool descriptions. Example: 'If the event is not found, returns {error: "notFound", suggestion: "Call calendar_list_events() to find the correct event ID."}' Provide retryable vs. fatal classifications.
• Replace free-form string parameters with JSON Schema enums. For calendar_create_event.eventType, define: {"enum": ["default", "outOfOffice", "focusTime", "workingLocation"]}. Same for format, role, and type across all tools.
• Add WHEN-TO-USE hints to tool descriptions. Example for calendar_list_events: 'Use this to search for events in a date range with optional query. If you have specific event IDs, use calendar_get_events instead.' Repeat for all ambiguous pairs.
• Implement dry-run or confirmation flow for destructive tools. calendar_delete_events and drive_delete_files should support a dry_run: true parameter that returns 'Will delete X items. Call with dry_run=false to confirm.' or add a separate confirm_delete step.
• Add pagination cursor support. calendar_list_events and drive_list_files should accept pageToken (in) and return nextPageToken (out) for scrolling large result sets without fetching everything at once.
• Document response chaining. calendar_create_event description: 'Returns eventId and calendarId so you can immediately pass them to calendar_update_event or calendar_delete_events.' Similar notes for drive_upload_file, drive_create_folder, etc.