Version Control for AI Agents

Track what your agent did, which prompt wrote each line, and inspect any step.

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, Codex, or OpenCode normally — activity is tracked automatically

# See what happened
rgt log
rgt blame src/file.go:42
rgt show <step-hash>

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

Demo

Examples

• Debugging a Bad Refactor - trace a realistic billing regression with rgt log, rgt blame, and rgt show.

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_code:claude-20260502-143021  |  3 steps  |  Last: 2 min ago
codex_cli:codex-20260502-091534     |  7 steps  |  Last: 2 hours ago

$ rgt log --session claude_code: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

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

Three primitives that should already exist:

• rgt log — what did this session do?
• rgt blame — which prompt wrote this line?
• rgt show — inspect the full context for any step

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-using turn creates a Step — a content-addressed snapshot of what changed, why, and who asked:

Step {
  parent:      <previous-step-hash>
  tree:        <workspace-snapshot>
  causes:      [{ tool_name: "Edit", args: <input>, result: <output> }]
  session_id:  "claude_code: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 the rgt command and automatically sets up shell completions for bash, zsh, and fish.

Via Go Install

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

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/

Binary Releases

Download pre-built binaries from GitHub Releases

Supported Tools

Hooks auto-configure on rgt init. No manual setup required.

Commands

Features

• Content-Addressed Storage — BLAKE3 hashing, automatic deduplication
• Fast Queries — SQLite index, sub-10ms lookups
• Per-Session DAG — Concurrent sessions tracked as separate refs
• Conversation Tracking — Survives /compact and /clear
• Hook-Driven — Transparent Claude Code, Codex, and OpenCode integration
• Zero Configuration — Hooks auto-configure on rgt init
• Concurrency-Safe — CAS refs, ACID transactions
• Gitignore-Compatible — .regentignore support

Editor Integration

VSCode Extension

Get inline blame annotations directly in your editor:

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

# 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

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

View Extension Docs →

re_gent vs Git

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

Roadmap

See ROADMAP.md for planned features including:

• Non-destructive rewind and fork operations
• Additional tool adapters (Cursor, Cline, Continue)
• Session sharing and merge support
• Garbage collection and integrity verification

Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

Quick Start:

• QUICK_START.md — 5-minute setup guide
• Good first issues

Before opening a PR:

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

Built With

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

License

Apache License 2.0