Single tool 'echo_tool' with minimal definition. Description is present but generic (18 chars: 'Echo a message as a tool'). Input schema visible with basic type info (string parameter 'message' with description). No output schema documented. No error handling guidance. Tool is trivial (read-only echo) and does not demonstrate production-grade patterns. Naming is verb-based but vague, 'echo' does not convey business value or distinguish from similar tools. No parameter constraints, no pagination, no composition hints.

• Expand tool description to 50 - 150 characters explaining WHAT the tool does, WHEN to use it, and what it returns. Example: 'Echo a message back to the caller. Use this to test connectivity or validate message formatting. Returns the echoed message as a string.'
• Document the output schema explicitly. Specify that the tool returns a string field (e.g., 'result': string) and any metadata (e.g., 'timestamp': ISO 8601 string).
• Add parameter constraints to the 'message' parameter: minimum length, maximum length, allowed character sets. Example: 'message (string, 1 - 1000 chars): The text to echo. Must not contain null bytes.'
• Implement error handling with actionable recovery hints. If message is empty, return: 'Error: message cannot be empty. Provide a non-empty string (1 - 1000 characters).'
• Rename tool to reflect business intent. If this is a connectivity test, call it 'test_connection' or 'health_check'. If it processes text, call it 'process_message' or 'validate_text'.

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

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