The server has a focused domain (health monitoring) with clear, action-oriented tool names. All 6 tools are explicitly registered with descriptions and JSON Schema input parameters. However, several definition-quality issues prevent a higher score: (1) Parameter descriptions are minimal or absent for several tools, the 'name' parameter appears in 4 tools with identical 1-line descriptions that could be more specific about format/constraints; (2) Output schemas are not documented, tool return types are inferred from code (CheckerSummary, etc.) but not visible in the tool definitions or rubric source; (3) Error handling guidance is minimal, tools like get_checker and get_check_history offer no recovery hints if a checker is not found; (4) No pagination guidance for get_check_history despite accepting limit/offset parameters; (5) Tool descriptions are functional but could better explain when/why to use each tool relative to others (e.g., difference between get_health_states, get_unhealthy_checkers, and running specific get_checker calls). The read-only vs. write distinction and separation into two files (HealthieTools.cs and HealthieActionTools.cs) is excellent architecture but not reflected in tool naming to guide agent selection.

• Document output schemas for all tools. For each tool, add a 'returns' section to the tool definition specifying the structure of CheckerSummary or other return types, including all fields the LLM might use downstream.
• Enhance 'name' parameter descriptions. Expand from 'The name of the component, as reported by get_health_states' to 'The unique name of the component (case-sensitive string, 1-255 characters, alphanumeric + hyphen). Retrieved via get_health_states.' Add constraints like max length, allowed characters, case sensitivity.
• Add error recovery hints to tool descriptions. For get_checker, get_check_history, run_check, and reset_checker, add: 'If checker not found, call get_health_states to verify the component name.' This mirrors the error message in code and guides LLM recovery.
• Document pagination limits for get_check_history. Specify: 'Returns up to 100 entries (default 20). Use limit and offset to page through history. Returns total_count to enable pagination UI.' Then expose total_count in the output schema.
• Consider adding a 'dry_run' parameter to run_check and reset_checker. Allow LLMs to preview side effects before committing: 'dry_run: boolean (optional, defaults to false), if true, shows what would change without executing.' This is especially valuable for reset_checker (irreversible operation).
• Distinguish read vs. write operations in tool names or descriptions. Prefix write tools with 'set_' or 'trigger_' (e.g., trigger_check, set_checker_healthy), or add '[WRITE]' to the tool description start. Current names are unclear to LLMs unfamiliar with the domain.