Server has 8 tools with complete schemas and descriptions. Naming follows verb_noun convention (youtube_*). Descriptions are present and substantive (100-250 chars avg), explaining WHAT and WHEN. However, parameter descriptions lack actionable constraints (enums, ranges, formats). Output schemas are not documented. Error handling is absent, no recovery guidance, no validation feedback. Missing idempotency hints on write operations. No tool annotations (readOnlyHint/destructiveHint). Composition is sound: tools are single-responsibility and chainable (video_id flows through multiple tools). Security: no visible credential leakage, but no audit logging or permission gates shown.

• Add enum constraints to parameters: dimensions=['day', 'month', 'overall'], privacy_status=['public', 'unlisted', 'private']. Replace description examples with formal JSON Schema enums.
• Document output schemas for all tools. E.g., youtube_channel_stats returns {subscriber_count: int, view_count: int, video_count: int, channel_name: str, ...}. Include field types and descriptions.
• Add error handling documentation: 'Raises: VideoNotFoundError (404, retryable=false), video_id does not exist or is private. Try youtube_list_videos() to find valid IDs.' Include actionable recovery steps.
• Add tool annotations: mark youtube_update_video with destructiveHint=true and idempotentHint=false. Mark read-only tools with readOnlyHint=true. This enables agents to reason about side effects.
• Implement pagination: youtube_list_videos and youtube_get_comments should return {items: [...], total_count: int, next_cursor: str|null}. Accept limit (1-50) and cursor parameters.