guardian-install

name: guardian-install description: > Guides you through installing and setting up Guardian — the AI-powered Git hook for automated code review — in any project. Use this skill whenever the user wants to add Guardian to a project, set up AI code review as a pre-commit hook, run guardian init or guardian install, create the .guardian config or AGENTS.md rules file, or protect a repo with AI-assisted commit gating. Trigger even if the user just asks "how do I use Guardian?" or "can you set up Guardian for me?"

Guardian — Installation & Setup

Guardian runs AI-assisted code review as a Git hook. When you commit, it inspects staged files, applies your project rules from AGENTS.md, calls the configured AI provider, and blocks the commit if the review fails.

Prerequisites

• Node.js ≥ 22
• An AI provider CLI already installed and authenticated (claude, gemini, opencode, codex, or agy-agent)
• A Git repository

Step 1 — Install Guardian

From npm (recommended):

npm install -D @ajosecortes/guardian-cli

Globally:

npm install -g @ajosecortes/guardian-cli

Verify:

npx guardian --help

Step 2 — Initialize the project

Inside the Git repo you want to protect:

guardian init

This creates two files:

Step 3 — Install the Git hook

guardian install

This injects a hook block into .git/hooks/pre-commit that runs:

npx guardian run || exit 1

To hook commit-msg instead of pre-commit:

guardian install --commit-msg

Step 4 — Configure .guardian

Edit the generated .guardian file to match your project:

PROVIDER="claude"
FILE_PATTERNS="*.ts,*.tsx,*.js,*.jsx"
EXCLUDE_PATTERNS="*.test.ts,*.spec.ts,*.d.ts,*.stories.tsx"
RULES_FILE="AGENTS.md"
STRICT_MODE="true"
CACHE="true"

Minimal setup — only PROVIDER is required. Everything else has sensible defaults.

Choosing a provider

PROVIDER="claude"       # Claude Code CLI
PROVIDER="gemini"       # Gemini CLI
PROVIDER="opencode"     # OpenCode CLI (default model)
PROVIDER="opencode:anthropic/claude-opus-4"  # OpenCode with specific model
PROVIDER="codex"        # OpenAI Codex CLI
PROVIDER="codex:o3"     # Codex with specific model
PROVIDER="antigravity"  # Antigravity CLI (agy-agent)
PROVIDER="antigravity:my-model"  # Antigravity with specific model

The provider CLI must be installed and in PATH.

Step 5 — Write your AGENTS.md

This is where the AI gets its review instructions. Be explicit about what matters in your project:

# Code Review Rules

## General

- Enforce consistent naming conventions
- Flag functions longer than 50 lines
- Reject console.log left in production code

## TypeScript

- Require explicit return types on public functions
- No use of `any` type

## Security

- Flag hardcoded credentials or tokens
- Validate all user inputs at system boundaries

You can also reference other markdown files using backtick syntax:

- UI rules: `docs/ui-rules.md`
- API rules: `docs/api-rules.md`

Guardian will inline those files into the final prompt automatically.

Step 6 — Install Guardian skills (optional)

Install Guardian's skill set into your AI provider so it understands the tool natively:

guardian add skills

Verify it works

guardian run

This runs a manual review against currently staged files. You should see the AI provider output and a final STATUS: PASSED or STATUS: FAILED.

Ignoring files

Create a .guardianignore file in the project root to exclude paths from review (same syntax as .gitignore):

dist/
*.generated.ts
coverage/

Removing Guardian

guardian uninstall

Removes Guardian's hook block from pre-commit and commit-msg. Does not delete .guardian or AGENTS.md.

Troubleshooting