Single tool with adequate naming (audit_pdf_axescheck) and clear description (194 chars, within baseline 34-392 range). Input schema present with proper type and description for pdf_path parameter. However, no output schema documented, LLMs cannot infer what the tool returns or plan downstream actions. No error handling guidance, no parameter validation constraints (e.g., file existence, size limits), and no recovery hints. Risk classification (READ_ONLY) is present but tool lacks idempotent/destructive annotations. Baseline: 90% of A+ tools have documented return types; this tool has none.

• Document the output schema with all fields the tool returns. Example: {"compliance_status": "pass|fail", "violations": [{"rule": "string", "severity": "error|warning", "description": "string"}], "report_url": "string", "timestamp": "ISO 8601 string"}. This enables LLMs to extract and act on results.
• Add parameter validation: 'pdf_path must be an absolute path to an existing PDF file (max 100 MB). Relative paths and URLs are not supported.' This prevents invalid inputs and guides LLM behavior.
• Enhance error handling with recovery hints: 'If the file does not exist, verify the path. If axesCheck is unreachable, retry in 30 seconds. If the PDF is corrupted, try remediate_pdf first.' This guides agent recovery.
• Expand tool description to include: 'Returns a compliance report with violations categorized by Matterhorn Protocol rules. Use this to identify accessibility issues before remediation.' This clarifies when to call the tool and what to expect.
• Migrate from STDIO to HTTP+SSE or Streamable HTTP transport to enable remote deployment and integration with hosted MCP clients. STDIO limits the tool to local-only use cases.