The 'echo' tool has a basic schema but lacks substantive description and documentation. The description 'Preserve native definitions' is cryptic and non-actionable (9 chars, well below the 10-char minimum for meaningful descriptions). The tool appears to be a test fixture rather than a production gateway tool. The input schema is present but minimal: a single 'message' string parameter with no description. No output schema is documented. No error handling guidance. The tool name 'echo' is generic and does not convey the tool's role within the MCP gateway context. The risk annotation 'READ_ONLY' is noted but tool annotations (readOnlyHint, etc.) are not visible in the source. This is a minimal stub implementation.

• Expand tool description to 50 - 200 chars explaining: (1) What the tool does in this gateway context, (2) When an LLM should call it (e.g., 'Use this to echo a test message for gateway diagnostics'), (3) What it returns.
• Add a description to the 'message' parameter: e.g., 'The message string to echo back (used for testing gateway connectivity).'
• Document the output schema explicitly, e.g., { 'type': 'object', 'properties': { 'echo': { 'type': 'string', 'description': 'The echoed message' } }, 'required': ['echo'] }.
• Rename 'echo' to a more descriptive name if it has a specific role in the gateway. E.g., 'test_gateway_health', 'echo_message_for_diagnostics', or 'gateway_diagnostics_echo'.
• If this is a test-only tool, move it out of production tool definitions or mark it explicitly as a diagnostic/test tool with instructions for how to enable/disable it.
• If the tool supports the readOnly annotation, register it via the formal MCP toolAnnotations mechanism: use the Tool type's 'annotations' field to register readOnlyHint=true.