Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ericwang915/PythonClaw --skill code_runnergit clone --depth 1 https://github.com/ericwang915/PythonClawWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ericwang915/pythonclaw/code_runner)<a href="https://agentmods.dev/skills/ericwang915/pythonclaw/code_runner"><img src="https://agentmods.dev/badge/skills/ericwang915/pythonclaw/code_runner/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ericwang915/pythonclaw/code_runner"><img src="https://agentmods.dev/badge/skills/ericwang915/pythonclaw/code_runner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00058 | $0.00414 |
| Opus 5.5 | $0.00023 | $0.00166 |
| Sonnet 5.5 | $0.00012 | $0.00083 |
| Haiku 4.5 | $0.00006 | $0.00041 |
Grade A, and why
code_runner scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Code Runner
When to Use
- Run or test Python code snippets
- Evaluate expressions (e.g., "calculate 2^100")
- Prototype logic or verify algorithms
- Execute user-provided Python code safely
When NOT to Use
- Running shell commands or external programs — use
run_command/ terminal - Executing non-Python code (JavaScript, etc.)
- Code requiring heavy I/O, network calls, or persistent state
- Editing or analyzing code without running it
Setup
No API keys or credentials needed. Uses the bundled run_code.py script.
Usage/Commands
python {skill_path}/run_code.py [options]
Input methods:
| Method | Example |
|---|---|
| Inline code | --code "print(2+2)" |
| From file | --file script.py |
| Stdin | Pipe code via stdin |
Options:
| Option | Description | Default |
|---|---|---|
--timeout N |
Max execution time (seconds) | 30 |
--format json |
Output as JSON (stdout, stderr, exit_code) | text |
--no-capture |
Stream output directly | off |
Notes
- Code runs in a subprocess (not eval/exec in the agent process) for safety
- Timeout prevents infinite loops
- Working directory is the project root
- For shell commands or other languages, use the terminal directly
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 59 lines · 58 tokens per session scan A 503a7ad16c59
code_runner is a skill published in the GitHub repository ericwang915/PythonClaw (45 stars, last pushed 10d ago), licensed MIT. It adds 58 tokens to every session and 414 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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