The server provides 7 YouTube tools with reasonable naming and mostly present descriptions. Tool names follow verb-noun patterns (youtube_search, youtube_get_video, etc.), which is good. However, there are significant gaps: parameter descriptions are sparse or missing for many fields, output schemas are not documented anywhere in the source, and error handling is not visible. The server achieves basic quality but lacks the polish needed for production agent use. Average tool score across 7 tools is 62.

• Document the output schema for every tool. Specify field names, types, and what data is included. Example: 'Returns {items: [{id: string, title: string, viewCount: integer}], totalResults: integer}'.
• Add descriptions to all parameters explaining what they control and why an agent would use them. Replace 'Part: snippet, statistics, contentDetails' with 'Part: which metadata to retrieve. snippet=title+description, statistics=views+likes, contentDetails=duration+definition. Most agents only need snippet.'
• For youtube_get_channel, clarify the parameter relationship: 'Exactly one of channel_id or username must be provided. If both are given, channel_id takes precedence. If neither is given, returns error: missing_channel_identifier.'
• Add error handling to each tool's description. Example: 'May return: not_found (video does not exist), unavailable (no transcript), quota_exceeded (try again later). For quota errors, implement exponential backoff.'
• Add pagination support to youtube_search with explicit next_page_token and result count fields.
• Document hard caps on result limits. Example: 'max_results capped at 50. If more are needed, use page_token to fetch subsequent pages.'
• Validate and document parameter ranges in descriptions: 'max_results must be between 1 and 50 (default: 10). Larger values ignored.'
• Return all IDs and references needed for chaining. If an agent searches for videos and then calls youtube_get_video, ensure search results include video_id, channel_id, and any other fields downstream tools need.