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Cn Math Expression

Name: Cn Math Expression
Author: freedompixels

作者 freedompixels · GitHub ↗ · v1.0.0 · MIT-0

cross-platform ⚠ suspicious

总下载

当前安装

版本数

在 OpenClaw 中安装

/install cn-math-expression

功能描述

cn math expression

使用说明 (SKILL.md)

Math Expression Evaluator

Safely evaluate mathematical expressions with support for common functions.

Features

Safe evaluation (no arbitrary code execution)
Common mathematical functions: sqrt, sin, cos, tan, log
Constants: pi, e
Basic arithmetic: +, -, *, /, **, %
Pure Python, no external dependencies

Supported Functions

Function	Description	Example
sqrt(x)	Square root	sqrt(144) = 12
sin(x)	Sine (radians)	sin(pi/2) = 1
cos(x)	Cosine (radians)	cos(0) = 1
tan(x)	Tangent (radians)	tan(pi/4) = 1
log(x)	Natural log	log(e) = 1
log10(x)	Base 10 log	log10(100) = 2
abs(x)	Absolute value	abs(-5) = 5
pow(x,y)	Power	pow(2,8) = 256

Supported Constants

pi = 3.141592653589793
e = 2.718281828459045

Usage Examples

# Basic arithmetic
python3 scripts/math_eval.py --expr "2 + 3 * 4"
# Result: 14

# Using functions
python3 scripts/math_eval.py --expr "sqrt(144) + pow(2, 10)"
# Result: 1028.0

# Constants
python3 scripts/math_eval.py --expr "2 * pi * 10"
# Result: 62.8318...

# Complex expression
python3 scripts/math_eval.py --expr "log(pow(e, 5)) + sqrt(81)"
# Result: 14.0

Safety

The evaluator uses Python's eval() with a restricted namespace. Only mathematical functions and constants are available. No imports, no file access, no system commands.

Error Handling

If the expression is invalid or contains unsafe operations:

{"error": "name 'os' is not defined"}

Exit code 1 on error.

Technical Details

Language: Python 3
Dependencies: None (standard library only)
License: MIT-0

安全使用建议

Review before installing. Do not use this skill on untrusted expressions unless the eval-based implementation is replaced with a strict math parser and resource limits.

功能分析

Type: OpenClaw Skill Name: cn-math-expression Version: 1.0.0 The skill implements a math expression evaluator in `scripts/math_eval.py` using Python's `eval()` function. While it attempts to sandbox execution by clearing `__builtins__` and providing a whitelist of functions, this approach is historically vulnerable to sandbox escape techniques that can lead to Remote Code Execution (RCE). It is classified as suspicious due to this critical security flaw, although there is no explicit evidence of intentional malicious logic or data exfiltration.

能力评估

⚠ Purpose & Capability

The math-expression purpose is coherent, but the implementation gives the expression to Python eval instead of a strict math parser, which is more powerful than the stated calculator capability.

⚠ Instruction Scope

The usage model invites arbitrary --expr input and says unsafe operations will fail, but the artifacts do not show an AST whitelist, attribute restrictions, or resource limits.

✓ Install Mechanism

There is no install script, no external dependency, and the only runnable code is the included standard-library Python script.

⚠ Credentials

For a simple math helper, raw Python eval is disproportionate because a crafted expression may execute unexpected Python behavior or consume local CPU/memory.

✓ Persistence & Privilege

The provided artifacts show no credentials, network calls, file writes, background persistence, or privilege escalation behavior.

如何使用

确保已安装 OpenClaw（本地或 Docker 部署）
在对话框中输入安装命令：/install cn-math-expression
安装完成后，直接呼叫该 Skill 的名称或使用 /cn-math-expression 触发
根据 Skill 的参数说明提供必要输入，即可获得结构化输出

版本历史

v1.0.0

- Initial release of Cn Math Expression (version 1.0.0) - Safely evaluates mathematical expressions using pure Python (no external dependencies) - Supports common math functions: sqrt, sin, cos, tan, log, log10, abs, pow - Includes mathematical constants: pi and e - Handles basic arithmetic operations: +, -, *, /, **, % - Protects against arbitrary code execution with a restricted namespace - Error messages provided for invalid or unsafe expressions

元数据

Slug cn-math-expression

版本 1.0.0

许可证 MIT-0

累计安装 0

当前安装数 0

历史版本数 1

常见问题