git-aftermerge

Track the downstream fate of every commit. Feed structured post-merge feedback to AI coding agents.

What This Is

git-aftermerge is a Python CLI + MCP server that analyzes what happens to code after it gets merged — tracking survival, reverts, churn, and bug-fix correlations — then feeds structured feedback back to coding agents so they learn from their own history.

Installation

pip install git-aftermerge

Quick Start

# Initialize in your repo
cd /path/to/your/repo
git-aftermerge init

# Check fate of a specific commit
git-aftermerge fate abc1234

# View aggregate patterns
git-aftermerge report

# Generate agent context file
git-aftermerge context --output .aftermerge/CONTEXT.md

Then in CLAUDE.md:

## Post-Merge Context
See .aftermerge/CONTEXT.md for code survival data and risky areas.

How It Works

1. Scan — parses git history, runs git blame to track line-level survival
2. Score — computes a 0–100 survival score per commit with penalties (reverts, bug-fixes) and bonuses (longevity, extensions)
3. Detect — finds reverts (standard + manual), bug-fix correlations, and churn spikes
4. Aggregate — rolls up patterns by path, author, commit type, size, and language
5. Serve — exposes everything via CLI, JSON, markdown context, or MCP tools

MCP Server

Add to your MCP config (claude_desktop_config.json or equivalent):

{
  "mcpServers": {
    "aftermerge": {
      "command": "git-aftermerge",
      "args": ["mcp-serve"],
      "cwd": "/path/to/your/repo"
    }
  }
}

Available MCP tools:

• aftermerge_get_fate — fate of a specific commit
• aftermerge_get_patterns — aggregate survival patterns
• aftermerge_get_risky_areas — directories with lowest survival scores
• aftermerge_get_recent_failures — recent reverts and bug-fix correlations
• aftermerge_get_context — markdown summary for agent injection

CLI Reference

git-aftermerge init           Initialize tracking in current repo
git-aftermerge scan           Update commit fate data
git-aftermerge fate <sha>     Show fate of a specific commit
git-aftermerge report         Show aggregate patterns
git-aftermerge context        Generate agent-consumable context file
git-aftermerge watch          Watch for new commits and auto-scan
git-aftermerge mcp-serve      Start MCP server (stdio)

Contributing

git clone https://github.com/inthepond/git-aftermerge.git
cd git-aftermerge
pip install -e ".[dev]"
pytest

License

MIT