safe-calculator

Evaluate mathematical expressions safely without executing arbitrary code.

2.4k|301|Updated Jan 29, 2026
One-click install
npx skills add https://github.com/cisco-ai-defense/skill-scanner --skill safe-calculator
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: safe-calculator
Source: https://github.com/cisco-ai-defense/skill-scanner/tree/main/evals/skills/command-injection/eval-execution
Command: npx skills add https://github.com/cisco-ai-defense/skill-scanner --skill safe-calculator

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a safe calculator that evaluates mathematical expressions without using unsafe Python constructs, preventing arbitrary code execution.

Core Features & Use Cases

  • Safe evaluation: prevents execution of user-provided code.
  • Local math computation for quick queries.
  • Use case: validate expressions in environments requiring safety.

Quick Start

Provide a mathematical expression and receive the evaluated result safely.

Frequently Asked Questions about safe-calculator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I safely evaluate mathematical expressions without arbitrary code execution?

To safely evaluate mathematical expressions without arbitrary code execution, you need a safe calculator that applies explicit parsing and validation. This skill restricts operations, prevents unsafe constructs, and provides clear error handling with safe fallback behavior.

What is the best way to compute user-provided math formulas securely in automation pipelines?

The best way to compute user-provided math formulas securely in automation pipelines is using a safe calculator that enforces restricted operations. It safely evaluates expressions by applying explicit validation and safe fallback behavior rather than executing raw input.

Can I use this safe calculator for interactive tutoring tools?

Yes, you can use this safe calculator for interactive tutoring tools. It safely evaluates mathematical expressions by enforcing restricted operations and applying explicit parsing, preventing arbitrary code execution while providing clear error handling.

Does the safe math evaluation method require specific dependencies?

No, the safe math evaluation method requires no specific dependencies. It operates independently by applying explicit parsing and validation to evaluate mathematical expressions safely without relying on external libraries or unsafe constructs.

Why does evaluating user expressions directly pose a security risk?

Evaluating user expressions directly poses a security risk because it can execute arbitrary code. Safe math evaluation prevents this by using explicit parsing and validation, enforcing restricted operations, and providing safe fallback behavior for invalid inputs.

Are there limitations when using restricted operations for math evaluation?

When using restricted operations for math evaluation, limitations include the inability to process complex or unsupported functions outside the allowed set. The safe calculator enforces these restrictions and provides clear error handling with safe fallback behavior for unsupported expressions.