The four arithmetic tools (add, subtract, multiply, divide) have clearly distinct, unambiguous purposes. The only oddity is reverse_string, which is unrelated to arithmetic and slightly muddies the server's scope, though it does not overlap with any other tool.

All tools use lowercase snake_case with a consistent verb-based pattern (add, subtract, multiply, divide, reverse_string). No mixing of conventions or casing styles.

Five tools is well-scoped for a simple calculator. Each operation earns its place and there is no redundancy or bloat.

Core arithmetic is fully covered (add, subtract, multiply, divide), but common calculator operations like modulo, exponent, or square root are missing. reverse_string also feels out of place and suggests an incomplete or inconsistent domain focus.