Single tool with mixed quality. Tool name 'google_news_search' follows verb_noun pattern correctly. Description is present (89 chars) and adequate but generic, lacks context on when to use this vs other news tools or what distinguishes results. Input schema is well-structured with 7 parameters, all typed as strings, but lacks critical metadata: no required field declaration, no enum constraints for country/language codes despite SerpAPI supporting specific values, no description of what 'topic_token', 'publication_token', 'story_token', 'section_token' actually represent (opaque tokens with no guidance on discovery). Output schema is completely undocumented, no evidence of return type specification in the tool definition. Error handling is present but minimal: returns isError flag but does not provide recovery guidance or categorize errors. No output pagination despite news results being inherently list-like. Tool composition is simple (single-responsibility), but no evidence of idempotent guarantees or safe retry semantics. Code shows parameter validation (isValidGoogleNewsSearchArgs) but function definition not visible, so cannot verify depth. Per-tool score reflects presence of schema and description but absence of output documentation and parameter clarity.

• Document output schema explicitly: declare that results contain { categories: Array<{ name: string, articles: Array<{ title, source, link, date, snippet }> }>, menu_links, timestamp }.
• Convert gl and hl parameters to enums or add constraint descriptions: 'Country code must be one of: us, uk, de, fr, in, ... (full list at https://serpapi.com/docs)', 'Language code must be one of: en, de, fr, es, ...'.
• Add descriptions for token parameters: 'topic_token: Optional. Opaque identifier for a specific news topic (e.g., "DAABCgABBAgDhQANAg=="). Obtain from previous search results or Google News topic URLs.' Similarly for publication_token, story_token, section_token.
• Mark 'q' as required in schema and add validation: 'Search query is mandatory and must be 1-256 characters'.
• Add pagination: introduce 'limit' (default 20, max 100) and 'offset' or 'page' parameters. Document limit in tool description.
• Enhance error messages with recovery guidance: 'Invalid country code: got "xx". Valid codes: us, uk, de, fr, in, ... Try again with one of these.' / 'SerpAPI quota exceeded. Wait 60 seconds before retrying or check account usage at serpapi.com.'
• Add per-parameter descriptions to match baseline (72 chars avg): 'q: Search query (required, 1-256 characters). Examples: "AI breakthrough", "stock market today".' Do this for all 7 parameters.
• Validate SERP_API_KEY presence and basic format at server startup, throw with actionable error message.