Gemini Review

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha ea59a0c53d79 · 14 Oct 2026Report an issue or request a re-scan

• Publisheralinaqi GitHub userOwner of the repository this skill is read from
• Source folderalinaqi/claude-bootstrap/skills/gemini-reviewThe exact folder we audited
• LicenceMITAs the repository states it
• Commit pinned for this verdictea59a0c53d79A new audit runs when the source changes
• Repository statusNot archivedPushed today
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Google Gemini CLI code review with Gemini 2.5 Pro, 1M token context, CI/CD integration

---
name: gemini-review
description: Google Gemini CLI code review with Gemini 2.5 Pro, 1M token context, CI/CD integration
when-to-use: When user requests Gemini-powered code review or needs large-context review
user-invocable: true
effort: medium
---

# Google Gemini Code Review Skill


Use Google's Gemini CLI for code review with Gemini 2.5 Pro - featuring a massive 1M token context window that can analyze entire repositories at once.

**Sources:** [Gemini CLI](https://github.com/google-gemini/gemini-cli) | [Code Review Extension](https://github.com/gemini-cli-extensions/code-review) | [Gemini Code Assist](https://codeassist.google/) | [GitHub Action](https://github.com/google-github-actions/run-gemini-cli)

---

## Why Gemini for Code Review?

| Feature | Benefit |
|---------|---------|
| **Gemini 2.5 Pro** | State-of-the-art reasoning for code |
| **1M token context** | Entire repositories fit - no chunking needed |
| **Free tier** | 1,000 requests/day with Google account |
| **Consistent output** | Clean formatting, predictable structure |
| **GitHub native** | Gemini Code Assist app for auto PR reviews |

### Benchmark Performance

| Benchmark | Score | Notes |
|-----------|-------|-------|
| SWE-Bench Verified | 63.8% | Agentic coding benchmark |
| Qodo PR Benchmark | 56.3% | PR review quality |
| LiveCodeBench v5 | 70.4% | Code generation |
| WebDev Arena | #1 | Web development |

---

## Installation

### Prerequisites

```bash
# Check Node.js version (requires 20+)
node --version

# Install Node.js 20 if needed
# macOS
brew install node@20

# Or via nvm
nvm install 20
nvm use 20
```

### Install Gemini CLI

```bash
# Via npm (recommended)
npm install -g @google/gemini-cli

# Via Homebrew (macOS)
brew install gemini-cli

# Or run without installing
npx @google/gemini-cli

# Verify installation
gemini --version
```

### Install Code Review Extension

```bash
# Requires Gemini CLI v0.4.0+
gemini extensions install https://github.com/gemini-cli-extensions/code-review

# Verify extension
gemini extensions list
```

---

## Authentication

### Option 1: Google Account (Recommended)

**Free tier: 1,000 requests/day, 60 requests/min**

```bash
# Run gemini and follow browser login
gemini

# Select: "Login with Google Account"
# Opens browser for OAuth
```

This gives you access to Gemini 2.5 Pro with the full 1M token context window.

### Option 2: Gemini API Key

**Free tier: 100 requests/day**

```bash
# Get API key from https://aistudio.google.com/apikey

# Set environment variable
export GEMINI_API_KEY="your-api-key"

# Or add to shell profile
echo 'export GEMINI_API_KEY="your-api-key"' >> ~/.zshrc

# Run Gemini
gemini
```

### Option 3: Vertex AI (Enterprise)

```bash
# For Google Cloud projects
export GOOGLE_API_KEY="your-api-key"
export GOOGLE_GENAI_USE_VERTEXAI=true
export GOOGLE_CLOUD_PROJECT="your-project-id"

gemini
```

---

## Interactive Code Review

### Using the Code Review Extension

```bash
# Start Gemini CLI
gemini

# Run code review on current branch
/code-review
```

The extension analyzes:
- Code changes on your current branch
- Identifies quality issues
- Suggests fixes

### Manual Review Prompts

```bash
# In interactive mode
gemini

# Then ask:
> Review the changes in this branch for bugs and security issues
> Analyze src/api/users.ts for potential vulnerabilities
> What are the code quality issues in the last 3 commits?
```

---

## Headless Mode (Automation)

### Basic Usage

```bash
# Simple prompt execution
gemini -p "Review the code changes for bugs and security issues"

# With JSON output (for parsing)
gemini -p "Review the changes" --output-format json

# Stream JSON events (real-time)
gemini -p "Review and fix issues" --output-format stream-json

# Specify model
gemini -m gemini-2.5-pro -p "Deep code review of this PR"
```

### Full CI/CD Example

```bash
# Get diff and review
git diff origin/main...HEAD > diff.txt

gemini -p "Review this code diff for:
1. Security vulnerabilities
2. Performance issues
3. Code quality problems
4. Missing error handling

Diff:
$(cat diff.txt)
" --output-format json > review.json
```

### Session Tracking

```bash
# Track token usage and costs
gemini -p "Review changes" --session-summary metrics.json

# View metrics
cat metrics.json
```

---

## GitHub Integration

### Option 1: Gemini Code Assist App (Easiest)

Install from [GitHub Marketplace](https://github.com/marketplace/gemini-code-assist):

1. Go to GitHub Marketplace → Gemini Code Assist
2. Click "Install" and select repositories
3. PRs automatically get reviewed when opened

**Commands in PR comments:**
```
/gemini review     # Request code review
/gemini summary    # Get PR summary
/gemini help       # Show available commands
```

**Quota:**
- Free: 33 PRs/day
- Enterprise: 100+ PRs/day

### Option 2: GitHub Action

```yaml
# .github/workflows/gemini-review.yml
name: Gemini Code Review

on:
  pull_request:
    types: [opened, synchronize]

jobs:
  review:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Install Gemini CLI
        run: npm install -g @google/gemini-cli

      - name: Run Review
        env:
          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
        run: |
          # Get diff
          git diff origin/${{ github.base_ref }}...HEAD > diff.txt

          # Run Gemini review
          gemini -p "Review this pull request diff for bugs, security issues, and code quality problems. Be specific about file names and line numbers.

          $(cat diff.txt)" > review.md

      - name: Post Review Comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const review = fs.readFileSync('review.md', 'utf8');
            github.rest.iss

Excerpt, first 6,000 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

1. 2026-10-14
   ✓SAFE B 89 / 100

   first audit · source ea59a0c53d79

Questions about Gemini Review

• github.com/alinaqi/claude-bootstrap/tree/main/skills/gemini-revi — the audited source at commit ea59a0c53d79 and every finding aboveObserved · 14 Oct 2026

Spotted something wrong? Report a correction · Methodology