CtrlK
BlogDocsLog inGet started
Tessl Logo

code-runner

Execute code in multiple programming languages. Use when the user asks to run, test, or debug code in Python, JavaScript, shell, or other languages.

68

Quality

83%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Code Runner Skill

Execute code using the exec tool in the sandbox environment.

Available Languages

Python 3

python3 -c "print('hello')"
# Or write to file and run:
python3 script.py

Install packages with: pip install package_name

Shell/Bash

echo "hello" && ls -la

Node.js (install first if needed)

# Install node if not available
apt-get update && apt-get install -y nodejs npm 2>/dev/null || apk add nodejs npm 2>/dev/null
node -e "console.log('hello')"

Guidelines

  • Always execute code immediately — don't just show it
  • For multi-line scripts, use write_file to save then exec to run
  • Install missing packages automatically without asking
  • Show the complete output to the user
  • If code fails, analyze the error and fix it automatically
  • For Python one-liners, use python3 -c "..."
  • For complex scripts, write to a .py file first

Error Handling

  • If a command fails, check the error and try to fix it
  • Common issues: missing packages (install them), syntax errors (fix them), permission denied (use appropriate paths)
  • Always retry at least once after fixing the issue
Repository
fastclaw-ai/fastclaw
Last updated
First committed

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.