YouTube Transcript Explorer has clear, action-oriented tool names and basic parameter descriptions, but suffers from incomplete output schema documentation, missing parameter type constraints, and weak guidance on error recovery. The server defines 4 tools with reasonable naming conventions (all verb-starting: get_*, search_*), but parameter descriptions lack detail on valid ranges, formats, and constraints. No enums for constrained inputs, no pagination support despite transcript length variability, and insufficient documentation of what fields clients should expect in responses. The instructions embedded in the server description are helpful for prompt engineering but do not substitute for per-tool schema and error guidance. Error handling is minimal, no indication of how LLMs should recover from invalid video IDs, missing transcripts, or API failures.

• Add explicit output schemas to each tool documenting field names, types, and meanings. Example for get_transcript: {"transcript": [{"text": string, "start": float, "duration": float}], "video_id": string, "video_title": string, "language": string}.
• Add min/max bounds to numeric parameters. Example: 'start_time (integer, 0 - 86400 seconds), the starting timestamp. Use 0 for the beginning of the video.'
• Document valid URL formats and add error handling. Example: 'Accepts full YouTube URLs (https://www.youtube.com/watch?v=VIDEO_ID), youtu.be short links, or bare video IDs. Returns error 'Invalid video ID or URL format' if unrecognized.'
• Implement and document pagination for transcript results. Add limit and offset parameters to get_transcript, cap results at 500 items per request, and include a total_entries count in the response.
• Add error recovery guidance in tool descriptions. Example: 'If no transcript is found, the tool will return {"error": "No transcript available for this video. Check that subtitles are enabled or try a different language."}. Suggest calling get_video_info first to verify available transcripts.'
• Expand parameter descriptions to 60 - 150 characters with format/constraint examples. Example for query parameter: 'Search term or phrase (case-insensitive, supports multi-word queries). Returns all matching segments with ±context_window seconds of surrounding text.'
• Add a 'language' parameter to tools to allow non-English transcript retrieval, with documentation of supported language codes (en, es, fr, de, etc.) and behavior when a language is unavailable.