This MCP server exhibits significant definition quality gaps across all six tools. While schemas are present and validly structured, descriptions are severely deficient (averaging 15-20 characters, well below the 194-character baseline), parameter descriptions are entirely absent, and tool naming lacks clarity. The server demonstrates basic protocol correctness but fails to meet production standards for LLM-facing tool design. Tools lack actionable guidance, context for selection, and parameter constraints that would help an LLM use them correctly.

• Expand each tool description to 50 - 200 characters, following pattern: 'WHAT the tool does, WHEN to use it, WHAT it returns.' E.g., 'echo' → 'Returns the input message unchanged. Use to test connectivity or echo user feedback. Returns {text: string}.'
• Add non-empty descriptions to EVERY parameter. Format: '<param name>: <type>. <constraint/format>. E.g. for greet: 'name: the user name (string, 1 - 50 chars). style: greeting tone (enum: casual|formal).'
• Document output schema for each tool as a structured object. E.g., 'geocode returns {latitude: number, longitude: number, address: string}' so agent can extract coordinates.
• Rename tools to verb_noun pattern: echo → echo_message, greet → greet_user, config → get_server_config, whoami → get_caller_identity. Improves LLM parsing.
• Remove duplicate 'echo' tool. Consolidate into a single definition used by both example servers.
• Add error handling guidance: 'On invalid coordinates, returns error 400: Invalid lat/lon. Latitude must be -90 to 90; longitude must be -180 to 180.'
• For geocode, document: 'Accuracy depends on address format. Unmatched addresses may return approximate coordinates. No official rate limit; recommended max 10 calls/second.'
• For whoami, specify output: 'Returns {user_id: string, email: string, roles: [string]}. Extracts sub, email, cognito:groups from JWT claims.'
• For config, specify output: 'Returns {debug: boolean, version: string, features: [string]}. Call before other tools to check feature availability.'

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

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