Three well-named, verb-led tools with clear, detailed descriptions (avg 180+ chars). All parameters have types and descriptions. Output schemas are documented in docstrings. Error handling is present but minimal, no recovery guidance or actionable error messages. Tool composition is sound: each tool has one responsibility. Naming follows verb_noun convention (scan_tests, list_rules, explain_rule). Parameter descriptions include constraints and defaults. Main gaps: no input validation examples, no error classification guidance, no per-item success/failure patterns for batch operations.

• Add explicit input validation to scan_tests: check that path is within a safe root, reject absolute paths outside project, and return 'Path traversal rejected: use relative paths only' with guidance.
• Enhance error responses with recovery hints. E.g., 'path does not exist: /foo/bar. Verify the path is correct and readable. Call scan_tests with a valid directory.' instead of bare error dict.
• Document the Finding dataclass structure in scan_tests docstring: 'Returns findings list with objects {path: str, line: int, rule: str, severity: str, ...}' so LLMs know what fields to extract.
• Add a max_rules parameter to list_rules (default 100) with pagination support, or document that RULES is bounded and safe to return in full.
• Validate rule parameter in explain_rule before lookup: reject empty strings, non-alphanumeric characters, and provide 'Did you mean: <similar_rule>' suggestions on mismatch.