39 tools with complete schemas and descriptions, but quality is uneven. Most tools have basic 1-2 sentence descriptions (avg ~60 chars, well below the 194-char baseline for A+ tools). Parameter descriptions are present but minimal. No output schemas documented. Error handling is absent, tools return null on API failure with no recovery guidance. Naming is consistent (verb_noun pattern) and clear. No tool annotations (readOnlyHint/destructiveHint) despite clear risk stratification. Missing idempotency guidance for write operations.

• Add output schemas to tool definitions. Document the structure returned by mapVideo, mapPlaylist, etc. so LLMs know what fields to expect and can chain tools correctly.
• Expand tool descriptions to 100-200 chars. Include WHEN to use (vs similar tools), WHAT it returns, and any prerequisites. E.g., 'Get full video metadata (title, duration, view count, etc.). Use this after search() to fetch details for a specific video ID.'
• Implement structured error responses. Instead of returning null, return {error: 'Video not found. Try search() with the video title.', retryable: false}. Guide LLMs on next steps.
• Add tool annotations to MCP tool definitions: readOnlyHint=true for list/get tools, destructiveHint=true for delete tools, idempotentHint=true for idempotent writes. This enables agents to reason about safety and retry logic.
• Document pagination behavior. For list tools, return {items: [...], totalCount: N, nextPageToken: '...'} so agents know when to stop iterating and can fetch all results safely.