Server has 7 tools with complete input schemas and descriptions, but quality is inconsistent. Tool names follow verb_noun convention (list_emails, send_email, etc.), which is good. However, descriptions are generic and lack actionable context for LLM selection. Parameter descriptions exist but are minimal (avg ~40 chars). No output schemas documented. Error handling is present but not recovery-focused. Missing tool annotations (readOnlyHint, destructiveHint). No pagination support despite list tools. Schemas are properly typed but lack constraints (enums, ranges, patterns). Overall: functional but below production baseline.

• Document output schemas for all tools. E.g., list_emails should return {emails: [{id, from, subject, snippet, labels}], total_count}. Include all fields downstream tools need (e.g., email id for modify_email).
• Expand tool descriptions to 80-150 chars. Example: 'List recent emails from inbox. Use this to browse messages; use search_emails for filtered queries. Returns email ID, sender, subject, and snippet.' This guides LLM selection.
• Add pagination: implement offset/limit or cursor-based pagination for list_emails and list_events. Return total_count and next_cursor. Cap default maxResults at 20.
• Add tool annotations in the tool definition: destructiveHint=true for send_email, modify_email, create_event, update_event; readOnlyHint=true for list_emails, search_emails, list_events.
• Add parameter constraints: maxResults min=1, max=100; query as string with pattern guidance; start/end as ISO 8601 date-time with format validation. Use JSON Schema format, pattern, minimum, maximum fields.