Server has three tools with reasonable structure and naming. All three tools start with action verbs (sayHello, calculate, getWeatherForecast) and have descriptions. Input schemas are present with type definitions and parameter descriptions. However, there are notable gaps: (1) Output schemas are not documented, the rubric requires 'Document the output schema' as a critical check, but tool responses are not formally specified; (2) Error handling is minimal, no recovery guidance, no categorization of errors as retryable/user-fixable/fatal; (3) The getWeatherForecast tool is only defined in a client example file (client-example.js), not in the main server.ts registration, suggesting it may not actually be registered; (4) Parameter constraints are present (latitude/longitude min/max) but inconsistently applied; (5) No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite all being marked READ_ONLY in the spec. The Zod validation schemas show good intent but are not exposed in tool definitions. Overall, foundation is present but polish and completeness are lacking.

• Document output schema for all tools. E.g. sayHello should explicitly state: 'Returns {content: [{type: string, text: string}]}'.
• Add error handling guidance to tool descriptions. E.g. calculate should state: 'Returns error if operation is invalid or if divide by zero is attempted. Allowed operations: add, subtract, multiply, divide.'
• Register getWeatherForecast as a proper tool in src/server.ts with server.registerTool(). Move it from client-example.js (example only) to actual server implementation.
• Enhance parameter descriptions. Change 'Latitude coordinate' to 'Latitude in degrees (-90 to 90, where negative is South). Example: 40.7128 for New York.'
• Add tool annotations. Use 'readOnlyHint: true' in tool definition metadata to declare safety properties.
• Expose validation constraints in tool descriptions. E.g. calculate description should mention 'Division by zero returns an error.'
• Consider batch variants. If agents will call sayHello multiple times, offer a greetMultiple(names: string[]) variant to reduce round-trips.

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

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