This server exposes 10 tools across 4 fixture agents (inbox-triage, metrics-reporter, repo-janitor, weather-scout). All tools have basic descriptions and parameter schemas visible in the source. However, critical gaps undermine production readiness: (1) Parameter descriptions are minimal or absent, most params lack detail on format, constraints, or valid values. (2) Output schemas are not documented, tools return strings with no structured schema declared. (3) Error handling is absent, no guidance on recovery, retryability, or actionable error messages. (4) No input validation or constraint enforcement visible. (5) Destructive tools (delete_message, prune_branches) lack confirmation/dry-run patterns. These are fixture/eval tools, not production implementations, which explains the minimal quality, but scored as-is, they fall well below production baseline.

• Document output schemas for all tools. E.g., summarize_inbox should return {summary: string, thread_count: int, unread_count: int} instead of a bare string.
• Expand parameter descriptions to include format, constraints, and valid values. E.g., 'kind' → 'Chart type (line, bar, pie, area)'; 'older_than_days' → 'Age threshold in days (1-365, default 30)'.
• Add confirmation/dry-run pattern to delete_message and prune_branches. E.g., add a 'confirm' boolean parameter or a separate 'preview_delete_message' tool.
• Implement error handling with actionable messages. E.g., 'Folder not found. Available folders: INBOX, SENT, DRAFTS' instead of generic errors.
• Add input validation with clear error feedback. Use enums for constrained fields (kind: [line, bar, pie]), min/max for numeric fields, and regex patterns for strings.