This server demonstrates solid definition quality with all four tools having proper schemas, clear descriptions, and good parameter documentation. Naming follows verb_noun convention well. However, several opportunities for improvement exist: output schemas are not explicitly documented, error handling lacks recovery guidance, and parameter relationships could be clearer. The tools are read-only and relatively straightforward, which limits complexity but also means some patterns (error classification, destructive operation safeguards) do not apply. Average description length is 85 characters (within baseline), and all tools have type-defined parameters with descriptions.

• Add explicit response schemas to each tool. Document field names, types, and nesting. For example, get_transcript_json should document: {entries: [{text: string, start: number, duration: number}], language: string, source: 'manual'|'auto-generated', title: string, author: string, ...}. See https://arcade.dev/patterns/tool#response-schema.
• Enhance error messages with recovery guidance. For example, when _get_transcript raises RuntimeError, catch it and return a structured error like {error: 'no_transcript_found', message: 'No transcript available...', suggestions: ['Try different language codes', 'Verify video has captions enabled', 'Check if video is public']}. See https://arcade.dev/patterns/recovery-guide.
• Clarify the distinction between get_transcript and get_transcript_json in their descriptions. For example: 'get_transcript returns a plain-text transcript with optional timestamps. Use this for readability. get_transcript_json returns the same transcript plus structured metadata (language, source, title, author, chapters), use this when you need to analyze or present video metadata alongside the transcript.'
• Document regex error handling in search_transcript. Add to the description: 'If regex is true and the pattern is invalid, an error is returned with the reason (e.g., unbalanced parentheses). Use only valid Python regex syntax.'
• Add timeout guidance to tool descriptions. For example: 'This tool may take 10-30 seconds if yt-dlp needs to fetch metadata. Ensure your client timeout is at least 60 seconds.'