Single tool 'web_search' has a clear, action-verb name and reasonable description (118 chars). Input schema is present with two parameters (query, maxResults), both typed and described. However, output schema is not documented in the source code, the description mentions 'sources with title, snippet, and published date' but no formal schema definition is visible. Parameter descriptions are adequate but lack detail on format/constraints (e.g., what constitutes a valid query, exact behavior of maxResults clamping). No error handling guidance provided. Tool is READ_ONLY, which is appropriate, but no explicit idempotent or readonly annotations visible in the code.

• Document the complete output schema: e.g., { results: [{ title: string, snippet: string, url: string, publishedDate?: string }], totalResults: number }. Include field types and whether fields are optional.
• Clarify maxResults behavior: 'Maximum results to return (1 - 50). If a server's limit is lower, the server's limit takes precedence. E.g., Tavily caps at 20, so maxResults=50 returns 20.'
• Add error handling guidance: 'If the search times out, retry with a shorter query or fewer maxResults. If the API key is invalid, check credentials. If the query is malformed, simplify it.'
• Add tool annotations to the tool definition: set readOnlyHint=true and idempotentHint=true to signal safety to LLMs.
• Expand query parameter description: 'A search query string (e.g., "machine learning trends 2024"). Supports quoted phrases and boolean operators (AND, OR, NOT) depending on the server. Max 500 characters.'