Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
Execute code in multiple programming languages. An agent skill from fastclaw-ai/fastclaw.
Custom licenceAuto-check passed
Install Code Runner
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install fastclaw-ai/fastclaw code-runner --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/code-runner .claude/skills/code-runner && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .claude/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runnerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install fastclaw-ai/fastclaw code-runner --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/code-runner .agents/skills/code-runner && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .agents/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install fastclaw-ai/fastclaw code-runner --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/code-runner .cursor/skills/code-runner && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .cursor/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/fastclaw-ai/fastclaw.git --path skills/code-runner--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install fastclaw-ai/fastclaw code-runner --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/code-runner .gemini/skills/code-runner && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .gemini/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install fastclaw-ai/fastclaw code-runnerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/code-runner .github/skills/code-runner && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .github/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add fastclaw-ai/fastclaw --skill code-runner -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install fastclaw-ai/fastclaw code-runner --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fastclaw-ai/fastclaw.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/code-runner .opencode/skills/code-runner && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "code-runner" agent skill from https://github.com/fastclaw-ai/fastclaw/tree/dev/skills/code-runner into .opencode/skills/code-runner/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-runner", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
code-runner- GitHub stars
- 1.4k
- Token cost
- ~348 tokens
- SKILL.md length
- 125 words
- Files
- 1
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Execute code in multiple programming languages. An agent skill from fastclaw-ai/fastclaw.
- The user asks to run
- SKILL.md covers Available Languages, Guidelines and Error Handling
- Calls python3, apt-get and apk
- Debug code in Python
What it does
Code Runner is an agent skill from fastclaw-ai/fastclaw. Execute code in multiple programming languages. Use when the user asks to run, test, or debug code in Python, JavaScript, shell, or other languages.
Its SKILL.md is about 350 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Python and JavaScript. The repository describes itself as: Multi-Agent Framework.
When your agent uses it
- The user asks to run
- Debug code in Python
- Other languages
Example prompts
- “/code-runner”
Requirements
- Python 3
- Node.js
What it can do on your machine
Read from SKILL.md and the folder at commit f401889. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
python3apt-getapknodepip
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Code Runner loads about 348 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 125 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 125 words (~348 tokens).
“Execute code using the exec tool in the sandbox environment.”
- name
- code-runner
Files
Just SKILL.md in skills/code-runner of fastclaw-ai/fastclaw.
Open the folder on GitHubat commit f401889
Compare with similar skills
Code Runner next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Code Runner this skillfastclaw-ai/fastclaw | 1.4k | — | ~348 | Automated safety check: Pass | Custom licence | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT | |
| CCXT Crypto Exchange Library2025Emma/vibe-coding-cn | 23k | 2 repos | ~4.4k | Automated safety check: Pass | MIT | |
| Fory Releaseapache/fory | 4.6k | — | ~2.9k | Automated safety check: Pass | Apache-2.0 | |
| Gemini API Devgoogle-gemini/gemini-skills | 4.3k | — | ~5.1k | Automated safety check: Pass | Apache-2.0 | |
| jscpd Code Migration Trackerkucherenko/jscpd | 6.4k | — | ~5k | Automated safety check: Pass | MIT |
Similar skills
CCXT Crypto Exchange Library
2025Emma/vibe-coding-cn
Reference help for the CCXT library covering crypto exchange APIs, market data, trading and order management across 150+ exchanges in JavaScript, Python and PHP.
Fory Release
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- Official
Gemini API Dev
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A skill your agent uses when writing code that calls the Gemini API for text generation, multi-turn chat, multimodal understanding, image generation, video generation, speech generation (TTS), voice…
jscpd Code Migration Tracker
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Measures a code port between languages or frameworks with jscpd's function-level comparison, porting tests before code and tracking what is left unmatched.
- Official
Gemini Live API Dev
google-gemini/gemini-skills
A skill your agent uses when building real-time, bidirectional streaming applications with the Gemini Live API, or migrating legacy Live models (2.0/2.5/3.1) to Gemini 3.8 Live.
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Questions about Code Runner
What does Code Runner do?
Execute code in multiple programming languages. An agent skill from fastclaw-ai/fastclaw. Code Runner is an agent skill from fastclaw-ai/fastclaw. Execute code in multiple programming languages.
When should I use Code Runner?
Code Runner fits situations like: the user asks to run; debug code in Python; other languages.
How do I install Code Runner in Claude Code?
Run `npx skills add fastclaw-ai/fastclaw --skill code-runner -a claude-code`. Or copy the skill folder (skills/code-runner in fastclaw-ai/fastclaw) into .claude/skills/code-runner in your project. Claude Code loads it when a task matches its description.
How do I install Code Runner in Codex?
Run `npx skills add fastclaw-ai/fastclaw --skill code-runner -a codex`. Or copy the skill folder (skills/code-runner in fastclaw-ai/fastclaw) into .agents/skills/code-runner in your project. Codex loads it when a task matches its description.
Can I use Code Runner in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add fastclaw-ai/fastclaw --skill code-runner -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-runner, .gemini/skills/code-runner, .github/skills/code-runner and .opencode/skills/code-runner in your project.
What does Code Runner need to run?
Going by SKILL.md and its folder, Code Runner needs the command-line tools its instructions call (python3, apt-get, apk, node and pip). Our summary lists: Python 3; Node.js.
Does Code Runner access the network?
SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Code Runner safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Code Runner use?
Code Runner has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Code Runner use?
About 348 tokens (SKILL.md is roughly 1.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Code Runner?
Skills that share tags, products or a category with Code Runner: Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), CCXT Crypto Exchange Library (2025Emma/vibe-coding-cn, 23k stars), Fory Release (apache/fory, 4.6k stars) and Gemini API Dev (google-gemini/gemini-skills, 4.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Code Runner?
fastclaw-ai (a GitHub organization) maintains it in fastclaw-ai/fastclaw, which has 1,354 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 6, 2026.
Source: fastclaw-ai/fastclaw on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.