Three tools with complete input schemas and basic descriptions, but significant gaps in parameter documentation and output schema clarity. Tool names lack action verbs (semrushDomain, semrushKeyword, semrushBacklinks instead of get_domain_ranks, analyze_keyword, list_backlinks). Descriptions are present but generic (avg ~80 chars, below 194-char baseline). Parameters have types and enums but lack detailed descriptions explaining constraints, formats, and use cases. No documented output schemas. Error handling is minimal, handlers throw generic errors without recovery guidance. Composition is reasonable (three distinct concerns), but naming conventions deviate from production baselines.

• Rename tools to start with action verbs: 'get_domain_ranks', 'analyze_keyword_difficulty', 'list_backlinks'. This matches production baselines (90% of A+ tools start with verbs) and clarifies intent for LLMs.
• Expand parameter descriptions to explain each enum value and when to use it. E.g., 'operation: "ranks" returns domain traffic and keyword metrics; "competitors" identifies similar domains.' Target 50-150 chars per param.
• Document output schemas for each tool. Specify which fields are returned (e.g., domain_rank, traffic_volume, keyword_count for ranks operation) so agents can chain calls and extract data reliably.
• Implement actionable error messages with recovery hints. E.g., 'Invalid domain format. Expected format: example.com (no http/https). Received: "http://example.com". Please retry with the domain only.'
• Move API key to server-side secret injection via environment variable or vault. Remove the fallback placeholder string and document how to configure SEMRUSH_API_KEY in deployment docs.