Single tool 'search' has a clear verb-noun name and acceptable parameter schema with types and descriptions. However, the tool description is minimal (23 chars: 'Web search via DuckDuckGo'), falling below the 50-200 char LLM-optimized baseline. No output schema is documented, the code returns raw DDGS results but the MCP tool definition does not specify what fields the agent should expect. No error handling guidance (e.g., what happens on network failure, rate limiting, or empty results). The tool lacks context on when to use it vs alternatives, prerequisites, or what the response structure contains. Parameter descriptions are present but terse (e.g., 'Search query' for 'query', 'Max results (default: 10)' for 'max_results'). The 'period' enum is well-defined but the 'domain' parameter lacks format guidance (should it be 'github.com' or 'site:github.com'?). No tool annotations (readOnlyHint, idempotentHint) despite being a read-only, idempotent operation.

• Expand tool description to 80-150 characters: 'Search the web via DuckDuckGo. Returns ranked results with title, URL, and snippet. Use this to find current information, documentation, or references. Supports time-based filtering (day/week/month/year) and domain-specific searches.'
• Document the output schema explicitly: 'Returns an array of objects, each with: title (string), href (string, full URL), body (string, snippet text). Empty array if no results found.'
• Add error handling guidance: 'If the search returns no results, try broadening the query or removing domain filters. Network timeouts are retryable. Rate limits are rare but may occur with very frequent searches.'
• Clarify the 'domain' parameter: 'Filter results to a specific domain (e.g., github.com). Internally converted to a site: operator. Do not include 'site:' prefix, pass the domain name only.'
• Add tool annotations to the MCP registration: readOnlyHint=true, idempotentHint=true to signal that repeated calls are safe and do not modify state.