Single tool with reasonable naming and clear parameter structure. Tool name 'get_transcript' follows verb_noun convention appropriately. Schema is visible and typed with Zod validation. However, descriptions are minimal (well under production baseline of 194 chars for tool descriptions and 72 chars for params), missing critical context about when/why to use the tool, and output structure is not formally documented. Error handling exists but lacks recovery guidance. No tool annotations present.

• Expand tool description to 100-200 characters explaining: 'Extracts and returns the full transcript of a YouTube video in the specified language. Use this to get the complete text content of videos for analysis, summarization, or content review. Returns formatted transcript text plus metadata (video ID, language, character count).'
• Document output schema explicitly in code comments or tool description: 'Returns {content: [{type: "text", text: <transcript_string>, metadata: {videoId, language, timestamp, charCount}}], isError: boolean}'. Include sample structure.
• Enhance 'lang' parameter description to: 'ISO 639-1 language code (e.g., 'en' for English, 'ko' for Korean, 'es' for Spanish). Default is 'en'. Transcript availability varies by video and language.'
• Add recovery guidance to error responses. Instead of just the error message, return actionable guidance: 'Invalid YouTube URL: expected youtu.be/xxx or youtube.com?v=xxx format, or 11-character video ID' or 'Transcript not available in requested language. Try en (English) or check YouTube for available languages.'
• Add tool annotations to Zod schema or McpServer registration: mark as readOnlyHint=true and idempotentHint=true to signal safety to LLM.
• Consider supporting batch/multiple transcripts in a single call to reduce round-trips if agents frequently process multiple videos. Alternatively, document expected usage patterns.