calculator

Compute arithmetic expressions safely using AST parsing with whitelisted operators.

Updated May 8, 2026

Search Tags:#python #calculator #math #ast #safe-eval #expression-evaluation

Ready to run

npx skills add https://github.com/Ynyqy/ZAgent --skill calculator-ynyqy

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: calculator
Source: https://github.com/Ynyqy/ZAgent/tree/main/zagent/workspace/skills/calculator
Command: npx skills add https://github.com/Ynyqy/ZAgent --skill calculator-ynyqy

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Quickly and safely compute mathematical expressions without exposing your environment to unsafe evaluation.

Core Features & Use Cases

Safe evaluation of arithmetic expressions using a restricted AST parser.
Supports +, -, *, /, exponentiation (**) and modulus (%).
Use case: quickly evaluate complex formulas in a chat or coding session.

Quick Start

Ask the agent to evaluate a math expression, for example "2 + 3 * 4".

Frequently Asked Questions about calculator

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

FAQPage Schema

How do I safely evaluate math expressions in Python without arbitrary code execution?▼

This Skill safely evaluates math expressions by parsing with a restricted AST parser that whitelists operators, preventing arbitrary code execution. It processes user-provided strings to compute arithmetic operations without exposing your environment to unsafe evaluation.

How do I compute arithmetic expressions in a chat or coding session?▼

To compute arithmetic expressions, ask the agent to evaluate a math string like "2 + 3 * 4". The Skill parses and calculates the result on demand, supporting basic arithmetic, exponentiation, and modulus operations.

What math operators are supported by safe AST expression evaluation?▼

Safe AST expression evaluation supports basic arithmetic including addition, subtraction, multiplication, division, exponentiation (**), and modulus (%). It restricts parsing to these whitelisted mathematical operations only.

Does safe expression evaluation prevent arbitrary code execution from user input?▼

Yes, safe expression evaluation prevents arbitrary code execution by whitelisting operators and parsing with AST. This restricted parser ensures only mathematical computations run on user-provided strings, blocking dangerous code execution.

Are there limitations to evaluating complex formulas using a restricted AST parser?▼

Evaluating complex formulas with a restricted AST parser is limited to basic arithmetic, exponentiation, and modulus operations. It does not support arbitrary Python functions or variables, as the whitelist enforces safe mathematical evaluation only.