Four well-named tools with clear, actionable descriptions (avg 156 chars). All tools have input schemas with typed parameters and descriptions. Tool names follow verb_noun pattern (get_*, search_*). Descriptions explain WHAT, WHEN, and output strategy (e.g., 'Returns file path plus preview, NOT full text'). Output schemas are documented in docstrings. Key gaps: no error handling guidance, no parameter constraints (enums/ranges), no security/permission declarations, output schemas not formally specified in JSON Schema format.

• Add formal JSON Schema output definitions to each tool's schema property. E.g., get_info should declare output as {type: 'object', properties: {video_id: {type: 'string'}, title: {type: 'string'}, ...}}.
• Document error scenarios in each tool description. E.g., 'Returns error if URL is invalid, video is private, or captions unavailable. Suggest search_info() to verify video exists.'
• Add 'lang' parameter constraint: enum of supported language codes (en, es, fr, ...) or pattern validation. Document default behavior when language unavailable.
• Add pagination to search_transcript: accept optional 'limit' (1-100, default 20) and 'offset' parameters; return {results: [...], total_count: N, has_more: bool}.
• Declare tool annotations via FastMCP: @mcp.tool(annotations={'readOnlyHint': True}) for get_info/search_transcript/get_segment; @mcp.tool(annotations={'destructiveHint': True}) for get_transcript (writes to disk).