Four well-defined tools with complete input schemas and detailed descriptions in Portuguese. All tools have proper enum constraints and parameter descriptions. However, output schemas are not documented in the visible code, and error handling guidance is minimal. Tool names follow verb_noun pattern (comex_*) but lack action verbs (get_, list_, search_). Descriptions are comprehensive (150-250 chars) and domain-specific, exceeding baseline quality. No security issues detected (read-only operations, no secrets in params). Composition is clean, each tool has a single responsibility.

• Rename tools to start with action verbs: 'comex_trade_flow' → 'search_trade_flow' or 'get_trade_flow'; 'comex_freight_cost' → 'get_freight_cost'; 'comex_data_caveats' → 'list_data_caveats'; 'comex_resolve_code' → 'resolve_code' (already acceptable).
• Document output schemas for all four tools. Add a 'returns' section to each tool definition showing the structure of the response object (e.g., array of {year, month, country, ncm, value_usd, weight_kg, density, caveats_applied}).
• Add error handling guidance to descriptions. E.g., 'If no results match the filters, returns empty array. If NCM code is invalid, returns error with valid NCM prefixes.' Include recovery hints like 'Try comex_resolve_code to validate country codes.'
• Enforce and document result limits in tool descriptions. E.g., 'Returns up to 50 rows by default (max 500). Use limit parameter to control. For large datasets, results are not paginated, apply filters to reduce size.'
• Add per-parameter min/max constraints in descriptions. E.g., 'limit: integer, 1 - 500 (default 50)' and 'years: array of integers, 1997 - 2025' to match rubric baseline for constrained input.