calculator

name	calculator
description	Evaluate mathematical expressions and unit conversions. Handles arithmetic, percentages, exponents, and common unit conversions (temperature, distance, weight). No external dependencies.
compatibility	Python 3.10+, no external dependencies
metadata	{"author":"SkillEvaluator Maintainers <[e-mail]>"}

Calculator

Evaluate math expressions and perform unit conversions from the command line.

Purpose

Provide a safe, sandboxed calculator for arithmetic expressions and common unit conversions without relying on eval() or external services.

Agent Instructions

1. Read this SKILL.md to understand capabilities.
2. Run scripts/calc.py with the user's expression or conversion.
3. Return the computed result to the user.

Examples

Usage

# Arithmetic expressions
python scripts/calc.py "2 + 3 * 4"
python scripts/calc.py "(100 - 25) / 3"
python scripts/calc.py "2 ** 10"

# Percentage calculations
python scripts/calc.py "15% of 200"

# Unit conversions
python scripts/calc.py "100 celsius to fahrenheit"
python scripts/calc.py "5 miles to km"
python scripts/calc.py "10 kg to lbs"

Output

A single line with the result, e.g.:

Result: 14

For conversions:

100 celsius = 212.0 fahrenheit

Limitations

• No symbolic algebra (no variables, no equations).
• Only supports basic arithmetic operators: +, -, *, /, **, %, parentheses.
• Unit conversions are limited to: celsius/fahrenheit, miles/km, kg/lbs, meters/feet.

Troubleshooting

Problem	Fix
Invalid expression	Check for unsupported operators or variables
Unknown conversion	Use supported units: celsius, fahrenheit, miles, km, kg, lbs, meters, feet