Single tool 'audit_url' has a well-structured schema with 8 parameters, all typed and described. Description is clear and action-oriented (94 chars, within 10-1024 baseline). Parameter descriptions are present and specific (e.g., 'Base URL to audit', 'Routes to audit'). However, output schema is not documented in the source, the tool returns audit findings but the response structure is not visible. No error handling guidance documented. Tool naming follows verb_noun pattern ('audit_url') and is unambiguous. Risk classification (READ_ONLY) is correct. Missing: output schema documentation, error recovery guidance, pagination/limit constraints on results.

• Document the complete output schema: list the fields returned (e.g., findings[], each with id, type, severity, description, fix, affected_elements), total_findings count, audit_duration_ms, and any pagination cursors. Include example response structure.
• Add error handling guidance to tool description: 'On network timeout, retry with fewer routes. On invalid URL, verify base URL is reachable. On Chrome failure, check CHROME environment variable and available system memory.'
• Constrain 'viewports' parameter: replace free-form string with an array of preset enums (e.g., ['mobile', 'tablet', 'desktop']) or structured objects [{width: 375, height: 667}, {width: 1280, height: 720}].
• Add explicit bounds to 'parallel' parameter: document valid range (e.g., 1 - 16) and explain trade-offs (more workers = faster but higher memory). Update description to 'Number of parallel worker browsers (1 - 16, default: auto-scaled to cores)'.
• Add pagination support: if audit findings can be large, accept a 'limit' parameter (default 50, max 500) and return a 'next_cursor' field for continuation. Document in description: 'Results are paginated; use limit and next_cursor for large audits.'