aidiff

Track which lines in your codebase were written by AI.

aidiff is git blame for AI-generated code. It tracks, scores, and visualizes how much of your codebase was written by AI assistants like Copilot, Claude, ChatGPT, and Cursor.

Why?

AI-generated code is becoming a significant portion of modern codebases. Studies show that AI-assisted developers accept ~30% of suggestions, and that number is growing fast.

But nobody tracks it. This creates invisible technical debt:

• Which files are mostly AI-generated?
• Are AI-written functions getting proper review?
• What's your team's actual AI code ratio over time?

aidiff answers these questions.

Quick Start

pip install aidiff

cd your-repo
aidiff scan          # Scan and show AI ratio
aidiff status        # Full statistics
aidiff report        # Generate HTML report

That's it. Three commands to understand your AI code footprint.

How It Works

aidiff uses a hybrid detection approach:

1. Explicit tags - # ai-generated, Co-authored-by: Claude, [AI] in commits
2. Commit analysis - Patterns in commit messages indicating AI involvement
3. Heuristic analysis - Detects AI coding patterns:
   • Overly verbose variable names (user_authentication_token_validation)
   • Redundant comments (# Initialize the result dictionary)
   • Placeholder TODOs (# TODO: Add error handling)
   • Docstrings longer than the function body
   • Universal type hints on every function

Commands

HTML Report

aidiff report generates a beautiful, self-contained HTML report with:

• AI code ratio trends over time (Chart.js)
• File-by-file AI score heatmap
• Contributor AI usage breakdown
• Recent commit AI classification

GitHub Action

aidiff init-action  # Generates .github/workflows/aigate.yml

This creates a GitHub Action that automatically comments on PRs with the AI code ratio, warning when it exceeds 70%.

Git Hook

aidiff install  # Installs pre-commit hook

Automatically runs aidiff scan before each commit, keeping .aidiff/data.json up to date.

Configuration

aidiff stores data in .aidiff/data.json in your repo root. This file is meant to be committed and shared with your team.

Insiders

Early supporters get priority features and direct input on the roadmap.

Become a Sponsor to unlock:

• Custom detection rules
• Team dashboard
• Slack/Discord notifications
• Priority support

License

MIT