The server has well-structured tool definitions with clear naming, reasonable descriptions, and properly typed input schemas. All three tools follow the verb_noun pattern and have enum constraints where appropriate. However, output schemas are not documented, error handling lacks recovery guidance, and descriptions could be more explicit about prerequisites and state changes. The tools are read-only and well-intentioned, but lack the depth expected for production-grade accessibility testing.

• Document output schemas for all three tools in the ListToolsRequestSchema response. For test_accessibility, specify that the response includes testId (UUID), filePath (string), summary object with violations/passes/incomplete/inapplicable counts, and timestamp (ISO 8601). For list_test_results, specify the array structure and what fields each result object contains (at minimum: fileName, timestamp, url, summary). For get_test_results, specify the structure of AccessibilityTestResult.
• Add error recovery guidance to tool descriptions. E.g., test_accessibility: 'If the URL is invalid, ensure it includes http:// or https://' and 'If the browser fails to initialize, the playwright dependency may be missing.' get_test_results: 'Call list_test_results first to discover available filenames.'
• Enhance test_accessibility description to mention prerequisites and constraints: 'Requires Playwright and axe-core to be installed. May take 10 - 30 seconds per URL depending on page complexity. Supports only publicly accessible URLs.'
• Add explicit idempotency note to test_accessibility: 'Multiple calls with identical parameters will generate new test IDs and timestamps; use includeScreenshot to capture evidence for repeated audits.'
• Add parameter constraint hints to get_test_results fileName: 'Should be a filename returned by list_test_results, typically in the format test-result-<timestamp>.json.' This guides agents on the expected format.
• Document pagination or result limits for list_test_results. If it can return hundreds of files, specify a limit parameter and document the return structure: 'Returns an array of file metadata with at least fileName, timestamp, and url fields. Limit results to 50 by default.'