Server defines 6 tools with basic schemas and descriptions. All tools have input schemas with type definitions and parameter descriptions, meeting minimum requirements. However, descriptions are generic and lack LLM-optimized guidance on WHEN to use each tool or HOW they differ. Output schemas are defined in TypeScript interfaces but not exposed in tool registration, LLMs cannot see what fields to expect. No error handling guidance, no parameter constraints (enums, ranges), and no mention of idempotency or side effects. Tool naming follows verb_noun convention (check_domain, explore_name, brainstorm_domains, analyze_domain, search_domains, list_categories), which is good. Parameter naming is clear (domain, name, prompt, count, category, max_price, min_price, tlds, sort, limit). However, descriptions lack actionable detail: 'Check a single domain's availability' does not explain when to use check_domain vs explore_name vs search_domains, or what the response structure contains. No per-parameter constraints (e.g., count defaults to 10 but no min/max stated). search_domains has 6 optional parameters with no guidance on mutual exclusivity or filtering logic. Overall, definitions are functional but below production quality.

• Add output schema documentation to each tool. Include a 'returns' field in the tool definition listing key response fields (e.g., 'Returns: {domain, available, status, purchase_price, renewal_price, premium, cache}') so LLMs know what to expect.
• Expand tool descriptions to 100 - 150 characters with explicit differentiation. Example: 'Check a single domain's availability and pricing. Use this for one domain; use explore_name() to check the same name across multiple TLDs; use search_domains() to filter by category or price range.'
• Add parameter constraints. For brainstorm_domains, specify 'count: 1 - 100 (default 10)'. For search_domains, document valid sort values (e.g., 'price_asc, price_desc, availability') and clarify that filters are AND-combined.
• Implement actionable error messages. Instead of 'Failed to check domain: 404', return 'Domain not found. Try explore_name("example") to check multiple TLDs, or search_domains() to find similar available names.'
• Document idempotency and caching behavior. Add to brainstorm_domains and analyze_domain: 'Results are deterministic and cached for 24 hours. Safe to retry.' This guides agent retry logic.