This server has only 2 tools (echo, health), both READ_ONLY, with minimal schema documentation and generic descriptions. Tool names lack action verbs and fail to communicate intent clearly. No visible parameter descriptions, no structured output schemas, and no error handling guidance. The server emphasizes infrastructure (Fastify, auth, metrics) over tool quality. Based on conservative rubric calibration, a 38 reflects major definition gaps across both tools.

• Rename 'echo' to 'send_echo' or 'echo_message' (verb_noun pattern). Rename 'health' to 'get_health' or 'check_health'. This immediately improves LLM intent inference.
• Provide full source code for src/tools/echo.ts and src/tools/health.ts showing explicit tool registration with McpServer.tool() or equivalent, including input schemas, descriptions, and output type hints.
• Add parameter descriptions for every input (e.g., 'message' for echo should have a description like 'The text to echo back to the caller'). All parameters must be typed.
• Document output schemas as JSON Schema or in tool descriptions. For echo, specify: returns {text: string, timestamp: string, ...}. For health, specify: returns {status: 'ok'|'degraded'|'error', checks: {...}}.
• Add error handling guidance. E.g., for echo: 'If the message is empty, return error: "Message cannot be empty."' For health: 'If a check fails, include its name and reason in the response; return status=degraded rather than failing entirely.'
• Include idempotency and state-mutation hints in descriptions. Both tools are READ_ONLY (good), but document this explicitly: 'This tool does not modify any state.'
• For health check, define what metrics are included (latency, dependency health, memory usage, etc.) so LLMs know when to call it and what to expect.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry