prscore

Use AI to detect how potentially dangerous is to merge this PR.

Why?

Is it better than traditional linters/code review approach?

It's a good option for tight, fast-paced teams where proper, detailed and qualified code review is a luxury. You still need tests, good typings and skilled engineers.

But if most of your code reviews are LGTM at best - try this instead.

Examples

• Big PRs (too many things at once to keep focus on)
• Breaking changes or changes in specific files (probably more edge-cases than we thought)
• Too much time between first and last commit (heuristically, the longer it takes the more focus is shifting towards "just ship it already")
• Incomplete error handling (The owls are not what they seem)
• and more

Installation

Required Claude API account

1. Add ANTHROPIC_API_KEY="your-key" to secrets
2. Install dependency

npm install --save-dev prscore

3. (optional) Create your custom config locally if needed

npm install -g prscore && prscore init

Usage

Local CLI

# Analyze a PR locally
export ANTHROPIC_API_KEY="your-key"
prscore --base main --head feature-branch

GitHub Action Setup

Check our setup

1. Add ANTHROPIC_API_KEY to repository secrets
2. Comment /prscore on any PR to analyze scoring

Access Control

By default, only users with write, maintain, or admin permissions can trigger /prscore analysis. This prevents unauthorized token usage.

To add additional trusted users:

1. Go to your repository Settings → Secrets and variables → Actions → Variables
2. Create a new repository variable named PRSCORE_TRUSTED_USERS
3. Set the value to a comma-separated list of GitHub usernames:

   user1,user2,user3
   

Example:

PRSCORE_TRUSTED_USERS: alice,bob,charlie

When an unauthorized user tries to run /prscore, they'll receive a comment explaining the restriction.

Risk Scoring

prscore calculates an overall risk score (0-10) based on:

Factor	Weight	What it checks
Breaking Changes	7	API changes, removed exports, schema modifications
Fatal Errors	10	Runtime crashes, null errors, white screens
PR Size	8	Lines changed (>2000 = critical)
Migrations	7	Database schema changes
Config Changes	5	Environment, Docker, infrastructure files
Time Span	1	Multi-day PRs (stale code risk)

Risk Levels:

• low (0-2.9): Safe to merge
• medium (3-4.9): Review carefully
• high (5-7.4): Risky, needs senior review
• critical (7.5-10): Dangerous, split or extend testing

Example Output

=== Deploy Risk Analysis ===

Overall Risk: 7.8/10 (CRITICAL)

Breakdown:
  PR Size: 8.5/10
  Breaking Changes: 9.0/10
  Fatal Errors: 7.0/10
  Migrations: 7.0/10
  Config Changes: 0/10
  Time Span: 3.0/10

Recommendations:
  • ⚠️ CRITICAL RISK: Require multiple senior reviewers
  • Document all breaking changes in PR description
  • Review database migration with DBA
  • Consider splitting this PR into smaller changes

Cost

Spend it wisely

Uses Claude Sonnet 4.5 API. Average cost per PR analysis:

• Small PR (<200 lines): ~$0.02
• Medium PR (200-500 lines): ~$0.02
• Large PR (500-1000 lines): ~$0.02
• Huge PR (>2000 lines): ~$0.03

Typical team (50 PRs/day): $1-1.50/day = ~$40/month

License

MIT