# A Space to test what a coding-agent guardrail says about a shell command

> Source: <https://discuss.huggingface.co/t/a-space-to-test-what-a-coding-agent-guardrail-says-about-a-shell-command/190936#post_1>
> Published: 2026-10-23 05:32:08+00:00

Hi all! I made a small Space where you can paste a shell command an AI coding agent might run and see what a guardrail would answer before it runs: allow, review (ask the user) or block, and which step decided it.

How it’s built, in case it’s useful to anyone doing the same:

`@spaces.GPU` function to exist, so there’s one that is never called and visitors’ GPU quota isn’t touched. That’s how a free account can host a small CPU model now that CPU Basic needs PRO.`gr.Server` (a FastAPI subclass): `GET /`, `POST /api/judge`. `GRADIO_SSR_MODE=false` is needed for the custom `/` route.`preload_from_hub` pulls the model files at build time, so a woken Space doesn’t download them.
The guard itself is laya-guard (MIT), hooks for Claude Code, Codex, Cursor, Gemini CLI and 7 more agents: [GitHub - scs0209/laya-guard: Free local guardrail for AI coding agents: every tool_call judged on-device (regex + Laya), allow/review/block · GitHub](https://github.com/scs0209/laya-guard)

Feedback welcome, especially commands it gets wrong.