Five tools with clear verb-noun naming (search_, describe_, fetch_, check_, topup_). All have descriptions (avg 180 chars, within 10-1024 baseline). Input schemas present with Zod types and descriptions. However, output schemas are NOT documented, LLMs cannot predict response structure. Parameter descriptions are adequate but lack format constraints (e.g., endpoint path pattern, param value ranges). Error handling exists but lacks recovery guidance. fetch_data and topup_credits have concerning design: fetch_data accepts open-ended params object (no validation hints), and topup_credits returns an error response for a free tool, which is confusing.

• Document output schemas for all tools. E.g., search_endpoints returns {endpoints: [{path, description, price, service}], total_count}. Use JSDoc or TypeScript interfaces visible in the schema registration.
• Add validation and constraints to fetch_data params. Either accept a typed object with known fields (path_params, query_params) or document which params are required/optional per endpoint via describe_endpoint.
• Refactor topup_credits response: return {ok: true, topup_url, min_amount_usd, next_step} on success. Reserve ok:false for actual errors (e.g., invalid amount).
• Add pagination to search_endpoints: accept limit (default 20, max 100) and offset parameters. Return {endpoints: [...], total_count, has_more}.
• Enhance error messages with recovery hints. E.g., 'Insufficient credits (need $5, have $2). Call check_balance() to verify, then topup_credits() to add funds.'