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dinghaibin

Calc Tool

by BIN · GitHub ↗ · v1.0.0 · MIT-0
cross-platform ⚠ suspicious
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Install in OpenClaw
/install calc-tool
Description
Perform mathematical calculations from the command line. Arithmetic, trig, and unit conversion.
README (SKILL.md)

Calc Tool - CLI Calculator

Command-line calculator supporting arithmetic, trig, and unit conversion.

Quick Start

calc-tool '2 + 2'

Features

  • Basic arithmetic
  • Trig functions (sin, cos, tan)
  • Unit conversion
  • Expression grouping

Examples

calc-tool '2 + 2'
calc-tool 'sin(45) * 10'
calc-tool '100 cm to inches'

See Also

  • Related documentation: man bc (if available)
Usage Guidance
Do not run this tool with untrusted input or as a privileged user. The calc implementation uses Python eval on raw expressions, which can run arbitrary Python code (not just math); this can be exploited to execute shell commands, read files, or modify the system. Before installing or using: (1) inspect or run the script in an isolated environment (container/VM) if you must test it; (2) prefer a fixed safer implementation (use a math expression parser or a sandboxed evaluator like asteval/numexpr or parse the AST and whitelist nodes/functions); (3) if you need this exact tool, modify evaluate() to strictly validate the expression (allow only digits, operators, parentheses, decimals, and an explicit whitelist of math function names) or replace eval with a safe evaluator; (4) avoid running it on sensitive hosts or with elevated privileges. If you want, I can suggest a safe replacement implementation or a patch to restrict allowed tokens and AST nodes.
Capability Analysis
Type: OpenClaw Skill Name: calc-tool Version: 1.0.0 The script 'scripts/calc.py' contains a critical Remote Code Execution (RCE) vulnerability due to the use of the 'eval()' function on unsanitized user input. While the tool is presented as a simple calculator, an attacker can bypass the intended mathematical logic to execute arbitrary Python code (e.g., using '__import__'). There is no evidence of intentional malice or exfiltration, but the implementation is highly insecure.
Capability Assessment
Purpose & Capability
Name, description, SKILL.md examples, and the included scripts/calc.py align: this is a command-line calculator implementing arithmetic, trig, and unit conversion. It requests no credentials, binaries, or install steps beyond being run as a script.
Instruction Scope
SKILL.md instructs the agent/user to run calc-tool with an expression. The implementation (scripts/calc.py) evaluates the user-supplied expression with Python's eval after simple string replacements but without safely restricting allowed operations or AST nodes. That means injected input (e.g., __import__('os').system(...)) could execute arbitrary Python, escalate from a calculator to remote/host compromise. The instructions do not warn about this risk or restrict input.
Install Mechanism
There is no install spec (instruction-only skill with an included script). Nothing is downloaded or written to disk by an installer, which is low-risk in itself.
Credentials
No environment variables, credentials, or config paths are requested. The declared requirements are minimal and proportional to a CLI calculator.
Persistence & Privilege
The skill does not request always:true or other elevated persistence. Default autonomy is allowed (normal), and the skill does not modify other skills or system-wide agent settings.
How to Use
  1. Make sure OpenClaw is installed (local or Docker)
  2. Run the install command in chat: /install calc-tool
  3. After installation, invoke the skill by name or use /calc-tool
  4. Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.0
Initial release
Metadata
Slug calc-tool
Version 1.0.0
License MIT-0
All-time Installs 0
Active Installs 0
Total Versions 1
Frequently Asked Questions

What is Calc Tool?

Perform mathematical calculations from the command line. Arithmetic, trig, and unit conversion. It is an AI Agent Skill for Claude Code / OpenClaw, with 41 downloads so far.

How do I install Calc Tool?

Run "/install calc-tool" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.

Is Calc Tool free?

Yes, Calc Tool is completely free, licensed under MIT-0. You can download, install and use it at no cost.

Which platforms does Calc Tool support?

Calc Tool is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).

Who created Calc Tool?

It is built and maintained by BIN (@dinghaibin); the current version is v1.0.0.

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