This MCP server has severe definition quality issues. Only 2 tools are defined, and both lack critical schema information. The 'fetch_docs' tool has a minimal input schema with only a 'urls' array parameter, but no output schema is documented. The 'list_doc_sources' tool has a description but no visible input schema or output structure. Tool descriptions are present but extremely brief (10-50 chars), falling well below the 50-200 char baseline for LLM-optimized descriptions. No parameter descriptions beyond the top-level array are visible. No error handling guidance is documented. The source code shows the server uses 'mcpdoc' and 'langchain-mcp-adapters' but the actual tool definitions are not visible in the provided code sample, only inferred from the server description.

• Provide full, visible tool definitions in the MCP server code or configuration file. Include explicit registration with JSON Schema input/output definitions for all tools.
• Expand tool descriptions to 100-200 characters. Include: (1) what the tool does, (2) when to call it vs alternatives, (3) key prerequisites, (4) what it returns. Example: 'list_doc_sources: Retrieves a list of available documentation repositories and their metadata (name, URL, last-updated). Call this first to discover which docs are searchable. Returns an array of sources with id, title, description, and access_url.'
• Add detailed output schema documentation. Define the structure of both 'list_doc_sources' (e.g. array of {id, name, url, last_updated}) and 'fetch_docs' (e.g. {url, title, content, sections, status}).
• Document per-parameter constraints. For 'fetch_docs.urls': specify format ('https://' only, or allow http?), length limits (max array size, max URL length), domain whitelist (if any), and timeout behavior (e.g. '5-second timeout per URL').
• Add parameter descriptions. The 'urls' parameter should explain: 'Array of document URLs to fetch (required, max 10 URLs per call). Each URL must be HTTPS and from whitelisted documentation domains. Fetching external URLs is forbidden for security.'
• Implement and document error handling. Return structured errors like: '{"error": "invalid_url", "message": "URL must start with https://. Got: http://example.com", "hint": "Check the protocol and try again"}' and '{"error": "fetch_timeout", "message": "Documentation fetch exceeded 5 seconds.", "hint": "Documentation may be temporarily unavailable. Retry in 10 seconds."}'