DocSearch has 3 tools with explicit FastMCP registration and visible input schemas, but significant description and schema quality gaps limit confidence. Tool naming follows verb-noun convention (register_, list_, search_) which is good, but descriptions lack crucial LLM guidance. Two tools have minimal parameter descriptions, and output schemas are not formally documented. Error handling exists but is generic. The server would benefit from richer parameter documentation, explicit output schema definitions, and more actionable error messages.

• Add parameter constraints to search_docs 'library' field: either document it as a free-form string that triggers auto-discovery, or define an enum of supported libraries with the note 'Unknown libraries will be auto-discovered via DuckDuckGo.'
• Expand list_supported_libraries description to: 'Returns the names of all pre-registered and auto-discovered libraries. Call this before search_docs to see which libraries are available, or use search_docs directly, it auto-discovers unknown libraries.'
• Document output schemas formally. For search_docs, define: 'Returns: {content: string (concatenated text from fetched pages), sources: [string] (URLs of fetched pages), error: string (null if successful)}'. For register_new_library: 'Returns: {success: boolean, message: string, library_name: string, base_url: string}'.
• Remove inline example values from descriptions. Instead, add pattern constraints to parameters. E.g., for base_url: type=string, pattern='^https?://', description='Valid HTTP(S) URL of the documentation root. Must be reachable and serve HTML documentation.'
• Add validation and error guidance: 'Invalid base_url, must be an HTTP(S) URL. If the URL is unreachable, the library will be auto-discovered on first search_docs call.' Return structured error: {error: 'invalid_url', message: '...', field: 'base_url'} so agents can self-correct.
• Convert search_docs error responses to structured JSON: {error: 'library_not_found|no_results|fetch_failed', message: '...', recovery: 'Try search_docs with a different query, or use register_new_library to add the library manually.'}