Quilt MCP Server

Quilt

Quilt is a command-line tool that tracks which agent wrote which lines in a shared Git checkout, so multiple AI coding agents can work in one repo at once and each commits only its own changes.

It captures every edit at the tool boundary, keeps a per-line record of who wrote what, and reconstructs each agent's own changes at commit time. Git stays the source of truth. Quilt never calls an LLM or spawns agents, and its state lives in a .quilt/ sidecar you can delete without touching your repo.

npm install -g @quilt-dev/cli
quilt setup     # wire Quilt into your repo (Claude Code, Cursor, or plain git)

The problem

You can run about three coding agents on one repo before they start clobbering each other. Two edit the same file and one silently overwrites the other. Their commits tangle into one blob you can't attribute. The usual advice is "run fewer," or "give each agent its own worktree."

Quilt lifts that ceiling. The agents share one checkout, and Quilt keeps attribution clean, prevents collisions, and gives each agent its own clean commit. And it holds as you add agents. Here are seven fanning out on one repo, run head to head:

That is ./examples/fleet.sh. It uses the quilt system, and you can also run it yourself.

What it does

• One shared checkout. Model humans, agents, and bots as actors editing one working tree, no worktree per agent.
• Line-level attribution. commit --mine commits only your lines, even when they share a hunk with another actor's.
• Symbol-level claims. Reserve utils.js#formatPrice, not the whole file, so agents editing different functions never contend. Ten languages via tree-sitter; whole-file claims for the rest.
• Collision prevention. A write into code another agent has claimed is denied, with the holder's stated intent, before any bytes change.
• Push-awareness. Claim a symbol that depends on a function another actor is changing, and Quilt warns you at claim time.
• Detect and preserve. If one actor overwrites another's uncommitted lines, Quilt snapshots the victim's version so nothing is silently lost.

Every commit Quilt produces is an ordinary Git commit. It trusts Git and never rewrites it, and all state lives locally under .quilt/. No account, no daemon.

Quickstart

quilt setup      # wire Quilt into the repo (MCP server, hooks, coordination)
quilt doctor     # confirm it's wired and capture is flowing

Give each agent process its own id, so Quilt can tell them apart:

QUILT_ACTOR=auth-agent claude    # this agent's edits are attributed to auth-agent

Then each agent commits only its own lines:

quilt status                     # who owns what
quilt preview --mine             # exact patch that would be committed
quilt commit --mine -m "fix auth redirect"

quilt fleet shows the whole picture: every actor, their claims, and anything that needs a human. See docs/reference.md for the full command list.

Why not worktrees?

A worktree per agent is the usual answer, and for fully independent tasks it works. But isolation moves the problem to the end, and its costs grow with the number of agents.

Worktrees isolate; they don't coordinate. When agents work the same code at the same time, you usually want them to see each other and account for each other as they go. That is what Quilt does. The two aren't mutually exclusive: worktrees for independent, long-running work, Quilt for agents in the same code at once.

Using it with agents

quilt setup wires the capture hooks and a shared MCP server. On Claude Code the hooks let agents use the built-in Edit and Write tools normally while Quilt records each change's author and blocks a write into code another agent holds, with no protocol for the agent to follow. Each agent just carries its own id in QUILT_ACTOR. For other runtimes, the same capture and prevention is available as MCP tools.

See docs/orchestrators.md for Codex, Cursor, Aider, and the difference between process-per-agent and many-agents-in-one-process setups.

Docs

• docs/orchestrators.md: running a fleet of agents.
• docs/reference.md: the full command list, how attribution works, and the .quilt/ state layout.
• bench/: the scenario ladder Quilt is tested against, run with and without Quilt on the same metrics.

Contributing

Contributions are welcome. See CONTRIBUTING.md.

License

MIT