Calculator

This calculator is functionally correct but unsafe to run in environments where untrusted users or untrusted inputs can supply expressions. The immediate risk is arbitrary code execution via Python eval despite the attempt to restrict globals. Before installing or enabling this skill for agents that handle external input, either: (1) replace the eval-based evaluator with a safe expression evaluator (parse the expression to an AST and whitelist node types and function names, or use a vetted math-expression library such as numexpr, sympy's parsing with controlled locals, or a dedicated sandboxed evaluator), (2) add strict input validation that only allows digits, operators, parentheses, percent signs, and the exact function names listed (and rejects any '.' or '__' tokens and alphabetic characters outside the whitelist), or (3) run the script in a hardened sandbox where it has no access to sensitive files/credentials. If you are not comfortable with code changes, avoid using this skill in unattended or high-privilege agents. If you want, I can produce a patched version that evaluates expressions safely (AST-based whitelist) or suggest specific libraries and code examples for a secure implementation.