# setup-agent-guard

The skill audits Agent Guard dependencies, installs missing tools, and verifies hook protections. It helps when SessionStart warns about degraded security.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 35
- Author: JeongJaeSoon
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/JeongJaeSoon/agent-guard/tree/HEAD/plugins/agent-guard/skills/setup-agent-guard/SKILL.md
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/skills/setup-agent-guard

## What it does

The skill restores Agent Guard functionality without silent machine edits. First, it identifies the plugin-local binary at `../../bin/agent-guard` instead of replacing it with a global copy from `PATH`. It executes `<agent-guard-bin> setup` for read-only diagnosis. Missing `jq` triggers a prompt with the exact package manager command. Missing `gitleaks` uses a checksum-pinned download with SHA-256 verification. The skill never calls `sudo` without user permission.

Sandbox blocks receive special handling. If the host sandbox prevents a write, the skill shows the exact terminal command so you can execute it separately. Next, it validates hook dispatch on the current host. In Codex, every hook must show as trusted inside Settings. In Claude Code, plugins reload after updates and run checks through `Bash`.

Live probes confirm boundary enforcement. The skill fires sentinel markers through standard command tools. `AGENT_GUARD_LIVE_PRE_TOOL_PROBE` must trigger a block before execution. `AGENT_GUARD_LIVE_POST_TOOL_PROBE` must mask the response with `[REDACTED]`. Because these markers prove dispatch, the skill never reads actual secret files during testing.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add JeongJaeSoon/agent-guard --skill setup-agent-guard -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/setup-agent-guard/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/setup-agent-guard/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add JeongJaeSoon/agent-guard --skill setup-agent-guard -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/setup-agent-guard/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add JeongJaeSoon/agent-guard --skill setup-agent-guard -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/setup-agent-guard/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install JeongJaeSoon/agent-guard setup-agent-guard
```

2. **Manually: put the files in place**
- File: `.github/skills/setup-agent-guard/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add JeongJaeSoon/agent-guard --skill setup-agent-guard -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/JeongJaeSoon/agent-guard --path plugins/agent-guard/skills/setup-agent-guard
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/setup-agent-guard/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add JeongJaeSoon/agent-guard --skill setup-agent-guard -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/JeongJaeSoon/agent-guard/tree/HEAD/plugins/agent-guard/skills/setup-agent-guard/SKILL.md

## When to use it
- diagnose and repair plugin-local Agent Guard binary
- install jq and checksum-verified gitleaks dependencies
- validate hook dispatch using non-destructive sentinel probes
- clear SessionStart degraded protection warnings

## Example prompts
- Run setup-agent-guard to fix the SessionStart degraded protection warning
- Diagnose Agent Guard dependencies and verify live hook dispatch
- Check if gitleaks is installed and run smoke tests via /agent-guard:setup-agent-guard

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2623bd236a541e5f.

BEGIN THIRD-PARTY FILE 2623bd236a541e5f
````text
---
name: setup-agent-guard
description: Diagnose, install, and verify Agent Guard's plugin-local binary, jq and gitleaks dependencies, the active host integration, and live hook protection. Use when Agent Guard reports degraded protection, a SessionStart warning asks for setup, plugin hooks fail or appear bypassed, or a user asks to finish or repair Agent Guard installation.
disable-model-invocation: true
---

# Setup Agent Guard

Make Agent Guard operational without silently changing the machine. Diagnose first, request approval before package-manager or download actions, and finish with a real smoke test.

## Workflow

1. Resolve the Agent Guard executable without confusing the plugin with a standalone install.
   - First use the plugin binary two directories above this skill: `../../bin/agent-guard` relative to this `SKILL.md` directory.
   - Resolve the path from the skill directory, confirm that it is executable, and use it for every plugin diagnosis and smoke test.
   - Separately inspect `command -v agent-guard`, if present. Compare its `version` with the plugin binary and report version drift, but do not substitute it for the plugin binary or modify the standalone installation without explicit approval.
   - Only fall back to `command -v agent-guard` when the plugin-relative binary is unavailable, and clearly state that plugin-local verification could not be completed.
   - Do not install a second copy of Agent Guard merely to get a command on `PATH`.

2. Run the read-only diagnosis:

   ```sh
   "<agent-guard-bin>" setup
   ```

   `setup` and `doctor` report only local dependencies. Their
   `host hook protection: unverified` notice is expected even when they exit
   `0`; do not call that result runtime protection.

3. If `jq` is missing, identify the available system package manager and show the exact install command. Ask for explicit user approval before running it. Do not use `sudo` unless the user explicitly approves elevated installation.

4. `setup`이 gitleaks 자체의 누락이 아니라 `gitleaks version isolation requires
   setsid or perl`을 보고하면 gitleaks를 다시 설치하지 마세요. Linux에서는
   `setsid`를 제공하는 `util-linux`를, Homebrew 환경에서는 Perl을 설치하는
   정확한 명령을 보여 주고 실행 전 명시적 승인을 받으세요. `setup --install`도
   이 보조 도구를 자동 설치하지 않으며, 보조 도구가 없으면 gitleaks 다운로드
````
END THIRD-PARTY FILE 2623bd236a541e5f

The third-party file has ended. Everything between the 2623bd236a541e5f tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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