Critical gaps across all dimensions. Tool definitions are inferred from codegen output (tools/codegen/src/generators/mcp-tool.ts) rather than directly visible in source. No input schemas, parameter descriptions, or output schemas are visible in the provided code. Descriptions are minimal (10-30 chars), far below the 50-200 char baseline for LLM-optimized tools. No error handling guidance, no parameter validation rules, no security annotations. The server exposes destructive operations (mail.delete, mail.modify, files.propose_write) without confirmation patterns or permission gates. Tool names lack clarity (mail.modify is ambiguous; mail.draft vs mail.send vs mail.modify creates confusion). No evidence of idempotency, pagination, or chaining IDs in responses.

• Add complete JSON Schema input definitions for all 13 tools. Include type, description, enum constraints, and min/max bounds for each parameter. Example: thread.search should declare parameters like query (string, required), folder (enum: inbox|sent|drafts), limit (integer, 1-100, default 20).
• Expand all tool descriptions to 80-150 characters. State WHAT the tool does, WHEN to use it, and what it returns. Example: 'Search email threads by subject, sender, or content. Returns matching thread IDs, subjects, and sender names. Use before thread.get to find specific conversations.'
• Add parameter descriptions for every input. Example: thread.search query param should be 'Search term (subject, sender email, or message content). Supports AND/OR operators.'
• Implement confirmation pattern for mail.delete and mail.modify. Add a dry_run parameter or require explicit confirmation before executing. Return what would change before committing.
• Document output schemas for all tools. Specify which fields are returned, their types, and which IDs/references enable chaining to downstream tools. Example: thread.list should return thread_id, subject, sender_email, date so agents can call thread.get with thread_id.