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An MCP server that provides tools for extracting, translating, and formatting YouTube video transcripts
YouTube MCP server has significant definition quality gaps. While tool names follow verb_noun conventions (get_transcript, get_multiple_transcripts, translate_transcript, format_transcript, list_available_languages), the definitions lack depth and precision. Descriptions are present but generic and often under 100 characters. Input schemas are visible in the provided summary but critical parameter details are missing from the actual source code inspection, the Makefile, Dockerfile, and shell scripts provided do not contain the actual tool registration code showing schema details. Parameter descriptions exist in the summary but appear to be inferred rather than directly verified in source. No output schemas are documented. Error handling guidance is absent. The server accepts tool definitions but implementation details suggest the tool registration happens in internal/mcp/server.go, which is not fully provided. Based on what can be verified: tool names are consistent and clear, but schema completeness and error handling are weak. This is a community-grade server with functional but underdeveloped tool definitions.
Formats a YouTube video transcript in various formats such as plain text, JSON, or markdown
Extracts transcripts from multiple YouTube videos in a single request with optional continue-on-error handling
Extracts transcript from a YouTube video with support for multiple languages and formatting options
Lists all available language options for a YouTube video's transcript
Translates a YouTube video transcript to a target language
Output schemas not documented. No tool returns a documented schema showing what fields agents can expect (transcript structure, metadata format, translation results, etc.). LLMs cannot plan downstream operations without knowing response structure.
Error handling lacks recovery guidance. No tool description explains what happens on failure (invalid video ID, language not available, translation unavailable, API rate limit) or suggests recovery steps.
Parameter constraints not fully formalized. 'languages' accepts an array of language codes but no description specifies valid codes (ISO 639-1 vs full codes?), ranges, or error behavior for unsupported languages. 'format_type' enum is declared (plain_text, json, markdown) but no rationale or use-case guidance provided.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | D | 50 | <=2025-11-25 | v2 |
| 2026-03-09 | F | 34 | 2024-11-05+ | v1 |
Descriptions under 100 characters lack detail. 'Extracts transcript from a YouTube video with support for multiple languages and formatting options' (89 chars) does not explain WHEN to use this vs get_multiple_transcripts, what the response contains, or any prerequisites (does video need captions enabled?).
Tool chaining IDs not guaranteed in responses. get_transcript may return a transcript, but no documentation specifies whether it includes the video_id, title, channel_name, or other metadata needed for follow-up calls. translate_transcript's response is undocumented, does it include source_language, confidence, timestamp mappings?
Batch vs single-item tool distinction unclear. get_multiple_transcripts accepts an array of video_identifiers. Response structure undefined, does it return per-video status? Partial success handling? If video #3 fails, does the agent retry all 3 or just #3?
Tool registration source incomplete. Tools are referenced in Makefile and shell scripts, but the actual tool definition code in internal/mcp/server.go is not provided for verification. Schema details and registration logic cannot be fully audited.