Server exposes 2 tools with STDIO transport only (hard cap 50). Tool definitions are present in source code with schemas and descriptions, but multiple critical issues undermine quality: (1) Input schemas visible and structurally sound for both tools, but descriptions are functional rather than LLM-optimized; (2) The server chains multiple complex operations (download → split → transcribe → write article) but exposes only 2 low-level tools that require orchestration via FastAgent chains rather than simple, composable interfaces; (3) prepare_youtube_video combines download AND normalization AND splitting, violates single-responsibility principle; (4) No error handling guidance for LLMs (e.g., what if video is too large, transcription fails, path is invalid); (5) Return types are documented in description text but not in structured schemas; (6) No output schema formally declared; (7) Security concern: video_path_str is user input with no validation against path traversal; (8) STDIO transport means this server is not remotely accessible and cannot be used with hosted MCP clients, architectural limitation.

• Split prepare_youtube_video into three separate tools: (1) download_youtube_video(url: str) -> {video_path: str, title: str, duration_seconds: int}; (2) split_video(video_path: str, part_mb: int) -> {base_dir: str, parts: [{index: int, filename: str, size_mb: float}]}. This aligns with single-responsibility principle and allows agents to retry individual steps.
• Add formal output schemas to tool definitions. Document transcribe_video_file return as {transcript: string, duration_seconds: int, word_count: int, language: string} or similar. This enables LLM planning.
• Validate video_path_str against path traversal: resolve to absolute path, verify it's within YOUTUBE_MCP_BASE_DIR, and reject if it escapes that boundary.
• Add error recovery guidance. Replace 'Error: File not found at {path}' with 'Error: Video file not found at {path}. Ensure prepare_youtube_video was called first, or verify the path with list_video_files tool.'
• Document part_mb bounds: add 'min: 1, max: 500' to schema and note in description: 'Typical range 5 - 100 MB. Smaller parts increase total count (slower processing, more LLM calls); larger parts may exceed memory limits.'
• Migrate from STDIO to HTTP+SSE or Streamable HTTP transport to enable remote access and hosted client compatibility.
• Document idempotency: 'Calling prepare_youtube_video twice with the same URL returns the same parts directory. Calling transcribe_video_file twice with the same video_path returns the cached transcript without re-processing.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry