Server has 8 tools with basic schemas and descriptions, but significant quality gaps. All tools have descriptions (good), but most are under 100 chars and lack actionable context. Parameter descriptions are minimal or missing context about constraints, formats, and dependencies. No output schemas documented. Error handling is absent, tools will fail silently or return raw API errors. No input validation guidance. Naming is generally clear (verb_noun pattern), but some descriptions are vague ('Fetch calendar events' lacks detail on filtering, pagination, or return structure). No tool annotations (readOnlyHint, destructiveHint). create_calendar_event is a WRITE operation but has no confirmation/dry-run pattern. Time tools (get_date_in_iso_format, sum_to_date) have format-specific descriptions but no validation rules stated. Overall: functional but below production baseline.

• Document output schemas for all tools. E.g., list_calendars returns [{id: string, summary: string}], get_calendar_events returns [{id, summary, start, end}]. Include these in docstrings or a separate schema file.
• Add destructiveHint annotation to create_calendar_event and implement a dry_run parameter or confirmation step before executing writes.
• Enhance parameter descriptions with explicit format rules: 'start_time (ISO 8601 with timezone, e.g., 2025-01-15T14:30:00+01:00). Must be before end_time.'
• Implement pagination for list_calendars and list_tasks: add limit (default 20, max 100) and offset parameters; return total_count and next_offset in response.
• Add error handling with actionable recovery messages. E.g., if CALENDAR_ID env var is missing, return 'CALENDAR_ID not set. Set it via environment or pass calendar_id parameter.' If API call fails, return 'Google Calendar API error: {reason}. Check credentials or network.'