This TypeScript MCP SDK demonstrates solid tool definition practices with complete schemas and reasonable descriptions for all 4 tools. All tools are READ_ONLY arithmetic/math functions with proper Zod schema validation. Naming follows verb_noun convention (calculate, power, sqrt, factorial). Descriptions are present and adequate (28-75 characters), though on the shorter end for complex parameter relationships. All parameters have proper type definitions and descriptions. However, the tool set is narrow (math-only), lacking natural identifier acceptance and some error-recovery guidance expected in production tools. The SDK itself is well-structured with generator-based handlers and streamable HTTP transport, but the example tools don't fully exercise best practices around error handling, pagination, or complex composition patterns.

• Expand descriptions to 50-150 characters and include explicit WHEN guidance: 'Calculate power(base, exponent) for exponential growth, compound interest, or scientific notation. Faster than repeated multiplication. Use this instead of calculate with repeated operations.'
• Add error recovery hints to descriptions: 'sqrt: If input is negative, will return NaN or error. Check constraints before calling. Alternatively, use absolute value via calculate tool.'
• Document return type in tool descriptions: 'Returns a numeric result as a TextResponse. Can be chained into subsequent calculate calls if needed.'
• State input constraints in plain English within parameter descriptions: 'n: Integer factorial argument. Must be 0 - 20 inclusive. Values > 20 will cause overflow or timeout. Try smaller values or use logarithmic approximation.'
• Implement structured error responses that classify errors: retryable (rate limit, timeout) vs user-fixable (invalid enum value, out-of-range) vs fatal (schema mismatch). This requires extending the handler to return ErrorResponse with a 'classification' field.
• Add idempotentHint and readOnlyHint tool annotations to clarify that all four tools are side-effect-free and safe to retry multiple times without consequence.

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

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