regent-vcs/re_gent

Source: https://github.com/regent-vcs/re_gent

Git for AI Agents

Version control for AI agent activity. Track what your agent did, which prompt wrote each line, and rewind when things break.

Demo

Every tool call is automatically captured. No manual commits needed.

Quick Start

# Install via Homebrew (macOS/Linux)
brew tap regent-vcs/tap
brew install regent

# Or via Go
go install github.com/regent-vcs/regent/cmd/rgt@latest

# Initialize in your project
cd your-project
rgt init

# Work with Claude Code normally (every tool call is tracked)

# See what happened
rgt log
rgt blame src/file.go:42

That’s it. Your agent activity is now auditable.

What You Get

See what your agent actually did

$ rgt log

Step a1b2c3d  |  2 min ago  |  Tool: Edit
│ File: src/handler.go
│ Added error handling to request handler
│ + 5 lines, - 2 lines

Step d4e5f6g  |  5 min ago  |  Tool: Write
│ File: tests/handler_test.go
│ Created unit tests for handler
│ + 23 lines

Step f8g9h0i  |  8 min ago  |  Tool: Bash
│ Command: go mod tidy
│ Cleaned up dependencies

Blame: which prompt wrote this line?

$ rgt blame src/handler.go:42

Line 42: func handleRequest(w http.ResponseWriter, r *http.Request) {

Step:    a1b2c3d4e5f6
Session: claude-20260502-143021
Tool:    Edit
Prompt:  "Add error handling to the request handler"

Track multiple concurrent sessions

$ rgt sessions

Active Sessions:
claude-20260502-143021  |  3 steps  |  Last: 2 min ago
claude-20260502-091534  |  7 steps  |  Last: 2 hours ago

$ rgt log --session claude-20260502-143021
# Filter history by session

See full context for any change

$ rgt show a1b2c3d

Step a1b2c3d4e5f6
Parent: d4e5f6g7h8i9
Session: claude-20260502-143021
Time: 2026-05-02 14:30:21

Tool: Edit
File: src/handler.go

Changes:
+ func handleRequest(w http.ResponseWriter, r *http.Request) {
+     if r.Method != "GET" {
+         http.Error(w, "Method not allowed", 405)
+         return
+     }
- func handleRequest(w http.ResponseWriter, r *http.Request) {

Conversation:
User: "Add error handling to reject non-GET requests"
Assistant: "I'll add method validation to the handler..."

Why This Exists

The problem: AI agents have no version control of their own.

You know this pain:

• “It was working five minutes ago”
• “Why did you change that file?”
• “Go back to before the refactor”
• /compact and pray
• Copy-pasting code into a fresh chat

The solution: Three primitives that should already exist:

• rgt log — what did this session do?
• rgt blame — which prompt wrote this line?
• rgt rewind — restore to any previous step (coming soon)

We gave agents write access to our codebases. We did not give ourselves git for it. re_gent fixes that.

How It Works

re_gent stores agent activity in .regent/ (like .git/):

.regent/
├── objects/     # Content-addressed blobs (BLAKE3)
├── refs/        # Session pointers (one per agent)
├── index.db     # SQLite query index
└── config.toml

Every tool call creates a Step:

Step {
  parent:      <previous-step-hash>
  tree:        <workspace-snapshot>
  transcript:  <conversation-delta>
  cause: {
    tool_name: "Edit"
    args:      <what-changed>
    result:    <tool-output>
  }
  session_id:  "claude-20260502-143021"
  timestamp:   "2026-05-02T14:30:21Z"
}

Steps form a DAG. Each session has its own branch. Common ancestors dedupe. You get git-level auditability for agent activity.

Technical details: See POC.md for the complete specification.

Installation

Via Homebrew (macOS/Linux)

brew tap regent-vcs/tap
brew install regent

This installs both regent and rgt commands (they’re identical) and automatically sets up shell completions for bash, zsh, and fish.

Via Go Install

go install github.com/regent-vcs/regent/cmd/rgt@latest

This installs the rgt command.

Shell Completion (manual setup):

# Bash
rgt completion bash > /usr/local/etc/bash_completion.d/rgt

# Zsh
rgt completion zsh > "${fpath[1]}/_rgt"

# Fish
rgt completion fish > ~/.config/fish/completions/rgt.fish

From Source

git clone https://github.com/regent-vcs/regent
cd regent
go build -o rgt ./cmd/rgt
sudo mv rgt /usr/local/bin/
# Optionally create a symlink: sudo ln -s /usr/local/bin/rgt /usr/local/bin/regent

For shell completion, follow the “Via Go Install” instructions above.

Binary Releases

Download pre-built binaries from GitHub Releases

Editor Integration

VSCode Extension

Get inline blame annotations directly in your editor:

Installation Options:

# 1. From VSIX (Recommended)
# Download the latest .vsix from:
# https://github.com/regent-vcs/vscode-regent/releases
# Then in VS Code: Extensions > ... > Install from VSIX...

# 2. From VS Code Marketplace (Coming Soon)
# Search for "re_gent Blame"

# 3. From source (Development)
git clone https://github.com/regent-vcs/vscode-regent
cd vscode-regent
npm install && npm run compile
# Press F5 in VS Code to launch Extension Development Host

Features:

• Inline blame annotations showing which step modified each line
• Hover tooltips with full step context (timestamp, tool name, arguments)
• Session timeline view in the sidebar
• One-click access to conversation history
• Direct SQLite integration—no subprocess overhead

Requirements: re_gent CLI must be installed and rgt init run in your project.

View Extension Docs →

Commands

Available Now:

Coming Soon:

Features

• Content-Addressed Storage — BLAKE3 hashing, automatic deduplication
• Fast Queries — SQLite index, sub-10ms lookups
• Per-Session DAG — Concurrent agents, no conflicts
• Conversation Tracking — Survives /compact and /clear
• Hook-Driven — Transparent Claude Code integration
• Concurrency-Safe — CAS refs, ACID transactions
• Gitignore-Compatible — .regentignore support

re_gent vs Git

re_gent complements git, doesn’t replace it. Use both.

Status

Active Development

• ~7.8k LOC Go implementation
• Core functionality: init, log, sessions, status, show, blame — COMPLETE
• Hook integration (Claude Code) — COMPLETE
• Used daily by contributors
• Not yet v1.0

Honest assessment: Production-quality code at POC-level feature completeness. We’re building in public.

Contributing

Contributions are welcome! re_gent is built in public and we actively review PRs.

Quick Start:

• Read QUICK_START.md for a 5-minute setup guide
• Check good first issues
• Full guidelines: CONTRIBUTING.md

Before opening a PR:

• Tests pass: go test ./... and go test -race ./...
• Linter passes: golangci-lint run
• Code formatted: go fmt ./...
• PR template filled out

Important files:

• CONTRIBUTING.md — Full contribution guide
• SUPPORT.md — Support and help resources
• TESTING.md — Testing guide and strategy
• CLAUDE.md — Project context and architecture
• POC.md — Technical specification

Built With

• cobra — CLI framework
• blake3 — BLAKE3 hashing
• go-diff — Myers diff
• modernc.org/sqlite — Pure Go SQLite

License

Apache License 2.0