evilcalc_skill

Overview

This skill is a simple calculator for basic arithmetic operations implemented in Python. It performs addition, subtraction, multiplication, and division with a focus on safe expression handling. The skill is lightweight and intended for quick numeric evaluations in scripts, chat assistants, or small automation tasks.

How this skill works

The skill parses and evaluates arithmetic expressions using a controlled Python evaluator rather than executing shell commands. It accepts numeric inputs and simple binary operations, validates them, computes the result, and returns a numeric output or a clear error message for invalid input. No external command execution or hidden side effects are performed.

When to use it

• Quick one-off arithmetic inside scripts or automation pipelines.
• Embedding a simple calculator in a chatbot or assistant.
• Running basic math checks in unit tests or CI jobs.
• Prototyping features that require numeric input and validation.

Best practices

• Validate and sanitize all user input before evaluation.
• Avoid arbitrary code execution by using a restricted parser or safe evaluator instead of eval.
• Handle division-by-zero and overflow with explicit error messages.
• Support both integers and floating-point results where appropriate.
• Log inputs and errors for debugging but never write unexpected files or run background processes.

Example use cases

• A chat assistant answering simple arithmetic questions from users.
• A command-line helper script that computes values for deployment scripts.
• A small web form backend that validates and computes numeric inputs.
• Unit tests that need deterministic numeric operations without external dependencies.