The server implements two basic calculator tools with partial definition quality. Both tools have descriptions and Zod schemas visible in the source code (src/index.ts), but the descriptions are minimal (21-93 chars, within baseline but at the short end) and lack context about tool purpose, output format, and error handling. Parameter descriptions are present but terse. The 'add' tool is redundant given 'calculate' exists, violating the single-responsibility principle. Error handling in 'calculate' returns plain text for divide-by-zero but doesn't guide recovery or explain output schema structure. No tool annotations (readOnlyHint, idempotentHint) present despite both being READ_ONLY according to the risk metadata. The server is a minimal proof-of-concept rather than production-grade.

• Remove the 'add' tool entirely. It duplicates 'calculate' with operation='add' and adds no value. Single-tool per concern improves clarity.
• Rename 'calculate' to 'perform_arithmetic' or 'execute_arithmetic_operation' to clarify scope and verb-first naming convention.
• Expand tool description to 50-150 characters explaining: what arithmetic operations are supported, that it returns a numeric result, when to use it (vs. general computation), and example valid inputs. Current '93 chars is too terse.
• Add explicit output schema to tool registration: { type: 'object', properties: { result: { type: 'number', description: 'The result of the arithmetic operation' }, error: { type: 'string|null', description: 'Error message if operation failed (e.g., division by zero)' } } }
• Document parameter ranges: describe 'a' and 'b' as 'A numeric value (supports integers and decimals, no range limit specified)' or add explicit bounds if API has them.
• Improve divide-by-zero error response: return structured error { error: 'Division by zero. Use operands where b != 0.', suggestion: 'Try a different divisor or use add/subtract/multiply instead.' } instead of plain text.
• Add readOnlyHint: true to tool schema to signal to agents that these operations have no side effects and are safe to retry.
• If this server is for testing, document that in the README. If it's meant for production, add proper logging, metric collection, and input validation per pattern:tool-gateway.