asyncreview

name	asyncreview
description	AI-powered GitHub PR/Issue reviews with agentic codebase access. Use when the user needs to review pull requests, analyze code changes, ask questions about PRs, or get AI feedback on GitHub issues.
allowed-tools	Bash(npx asyncreview:*)

AsyncReview CLI

When to use this skill

Use this skill when the user:

• Asks to review a GitHub pull request
• Wants AI feedback on code changes in a PR
• Needs to check if a PR breaks existing functionality
• Asks questions about a GitHub issue or PR
• Wants to verify if something was missed in a code change

How to use this skill

1. Check prerequisites — Verify GEMINI_API_KEY is set
2. Check if repo is private — Use gh repo view to determine if GITHUB_TOKEN is required
3. Set GITHUB_TOKEN if needed — Use gh auth token for private repos
4. Get the PR/Issue URL — Ask user if not provided
5. Formulate a question — Convert user's request into a specific question
6. Run the review command — Execute npx asyncreview review --url <URL> -q "<question>"
7. Present the results — Share the AI's findings with sources

Prerequisites

1. Check for GEMINI_API_KEY (Required)

Before running any command, check for GEMINI_API_KEY:

echo $GEMINI_API_KEY

If empty or not set, ask the user to provide their Gemini API key:

"AsyncReview requires a Gemini API key. Please set GEMINI_API_KEY in your environment or provide it now."

Then set it:

export GEMINI_API_KEY="user-provided-key"

2. Check if Repository is Private (Critical)

IMPORTANT: Before reviewing a PR/Issue, you MUST check if the repository is private. If it is, GITHUB_TOKEN is REQUIRED.

Step 1: Extract owner and repo from URL

From a URL like https://github.com/owner/repo/pull/123, extract:

• owner: owner
• repo: repo

Step 2: Check repository visibility

Option A: Using GitHub CLI (if available)

gh repo view owner/repo --json isPrivate -q '.isPrivate'

Option B: Without GitHub CLI (using curl)

# Try to access the repo via GitHub API without authentication
curl -s -o /dev/null -w "%{http_code}" https://api.github.com/repos/owner/repo

Possible outcomes:

• With gh:

  • true → Repository is private, GITHUB_TOKEN is REQUIRED
  • false → Repository is public, GITHUB_TOKEN is optional
  • Error (e.g., "not found") → May indicate private repo without auth, or repo doesn't exist

• With curl:

  • 200 → Repository is public, GITHUB_TOKEN is optional (but recommended for higher rate limits)
  • 404 → Repository is private or doesn't exist, GITHUB_TOKEN is REQUIRED
  • 403 → Rate limited, need GITHUB_TOKEN

Step 3: If private, ensure GITHUB_TOKEN is set

# Check if GITHUB_TOKEN is already set
echo $GITHUB_TOKEN

If empty or not set, obtain it using one of these methods:

Option A: Using GitHub CLI (if available)

# Get token from GitHub CLI (must be authenticated with `gh auth login` first)
export GITHUB_TOKEN=$(gh auth token)

# Verify it's set
echo $GITHUB_TOKEN

If gh auth token fails, authenticate first:

gh auth login

Option B: Without GitHub CLI (create token via web)

1. Go to GitHub: https://github.com/settings/tokens
2. Click "Generate new token" → "Generate new token (classic)"
3. Give it a descriptive name (e.g., "AsyncReview CLI")
4. Select scopes:
   • ✅ repo (Full control of private repositories)
5. Click "Generate token"
6. Copy the token (you won't see it again!)
7. Set it in your terminal:

export GITHUB_TOKEN="ghp_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# Verify it's set
echo $GITHUB_TOKEN

Security tip: For better security, consider creating a fine-grained token with minimal permissions:

• Go to: https://github.com/settings/personal-access-tokens/new
• Select specific repositories
• Grant only "Contents" read permission

Then run the review with the token:

npx asyncreview review --url <URL> -q "question" --github-token $GITHUB_TOKEN

Or set it as an environment variable for the session:

export GITHUB_TOKEN=$(gh auth token)
npx asyncreview review --url <URL> -q "question"

Quick start

npx asyncreview review --url <PR_URL> -q "question"   # Review a PR
npx asyncreview review --url <PR_URL> --expert        # Expert code review
npx asyncreview review --url <PR_URL> --output markdown     # Markdown output

Core workflow

1. Get PR URL from user
2. Run review with specific question
3. Read the step-by-step reasoning output
4. Model can fetch files outside the diff autonomously

Commands

Review

npx asyncreview review --url <url> -q "question"      # Review with question
npx asyncreview review --url <url> -q "q" --output markdown # Markdown output
npx asyncreview review --url <url> -q "q" -o json     # JSON output

URL formats supported:

• https://github.com/owner/repo/pull/123
• https://github.com/owner/repo/issues/456

Environment variables

GEMINI_API_KEY="your-key"         # Required: Google Gemini API key
GITHUB_TOKEN="ghp_xxx"            # Optional: For private repos / higher rate limits

Example: Review a PR

npx asyncreview review \
  --url https://github.com/stanfordnlp/dspy/pull/9223 \
  -q "Does this change break any existing callers?"

Output shows:

• Step number
• 💭 Reasoning (what the AI is thinking)
• 📝 Code (Python being executed)
• 📤 Output (REPL result)
• Final answer with sources

Example: Check if feature exists elsewhere

npx asyncreview review \
  --url https://github.com/owner/repo/pull/123 \
  -q "Fetch src/utils.py and check if deprecated_func is still used"

The AI will:

1. Search for the file path
2. Fetch the file via GitHub API
3. Analyze content in the Python sandbox
4. Report findings with evidence

Example: Review a Private Repository PR

Complete workflow for private repositories:

# Step 1: Extract owner/repo from URL
# URL: https://github.com/myorg/private-repo/pull/42
# owner="myorg", repo="private-repo"

# Step 2: Check if repository is private

## Option A: With GitHub CLI
gh repo view myorg/private-repo --json isPrivate -q '.isPrivate'
# Output: true (it's private!)

## Option B: Without GitHub CLI (using curl)
curl -s -o /dev/null -w "%{http_code}" https://api.github.com/repos/myorg/private-repo
# Output: 404 (likely private or doesn't exist)

# Step 3: Ensure GITHUB_TOKEN is set
echo $GITHUB_TOKEN

## If empty, Option A: Get from GitHub CLI
export GITHUB_TOKEN=$(gh auth token)

## If empty, Option B: Create via web (https://github.com/settings/tokens)
## Then:
export GITHUB_TOKEN="ghp_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

# Step 4: Run the review with the token
npx asyncreview review \
  --url https://github.com/myorg/private-repo/pull/42 \
  -q "Does this PR introduce any security vulnerabilities?" \
  --github-token $GITHUB_TOKEN

# Alternative: Token is already in environment, no flag needed
npx asyncreview review \
  --url https://github.com/myorg/private-repo/pull/42 \
  -q "Does this PR introduce any security vulnerabilities?"

If you get a 404 or authentication error: The repository is likely private, and you need to provide GITHUB_TOKEN.

Output formats

Format	Flag	Description
Pretty	(default)	Rich terminal output with boxes
Markdown	--output markdown or -o markdown	Markdown formatted
JSON	--output json or -o json	Machine-readable

Expert Code Review

Use --expert flag for comprehensive PR reviews covering SOLID principles, security, performance, and code quality:

# Full expert review (no question needed)
npx asyncreview review --url <PR_URL> --expert

# Expert review with additional custom question
npx asyncreview review --url <PR_URL> --expert -q "Also check for breaking API changes"

Expert review analyzes:

• SOLID Principles - SRP, OCP, LSP, ISP, DIP violations
• Security - XSS, injection, auth gaps, race conditions, secrets
• Code Quality - Error handling, N+1 queries, boundary conditions
• Removal Candidates - Dead code, unused imports

Output includes:

• Severity-tagged findings (P0 Critical → P3 Low)
• Suggested fixes for P0/P1 issues
• Overall assessment: APPROVE / REQUEST_CHANGES / COMMENT