MT Code
One command center for your coding agents
Run Claude Code, Codex, Cursor, Grok Build, and OpenCode from your desktop, browser, or phone — free, open source, on your machine.
Agents that use your computer
An agent takes over the browser and desktop UI so you don't have to — clicking, typing, and verifying its own work on screen.
The same engine is open source on its own for Claude Code, Codex and Cursor: Computer Use.
Click, type, and verify on screen
Computer Use lets agents drive browser tabs and desktop UI on your machine — with any provider, not just one vendor's model.
Watch — and take over — another machine
Computer View opens a live remote desktop of the computer a thread is running on. Moving over it moves that machine's real cursor; typing goes wherever it is focused.
An activity timeline agents can read
Computer History keeps an opt-in record of what you worked on (not screenshots) so agents can pick up context from your day.
Agents coordinate across threads
Reference another thread with #, let sibling threads message each other, and let agents open, park, and close threads themselves.
Up and running in minutes
Install a coding agent
MT Code drives the agents you already subscribe to. Set up at least one CLI: Claude Code, Codex, Cursor, Grok Build, or OpenCode — then sign in to it once from your terminal.
Download and open MT Code
Grab the installer above. macOS: Developer ID signed and notarized. Windows: SmartScreen may warn until Azure Trusted Signing is enabled.
Pick a project and start a thread
Point MT Code at a folder, choose your agent, and send the first message. Every thread keeps durable history, checkpoints, and diffs you can restore.
Take it with you
Pair from Settings → Connections to reach the same agents from your phone, a browser, or another machine — over T3 Connect, SSH, or your own tunnel.
Works with your existing subscriptions — MT Code sells nothing and adds no accounts of its own.
Built for people who run agents all day
Picks up where you left off
Threads and agents that were running when the app closed automatically resume on the next launch.
Keeps working until it's done
Set a goal with /goal and the thread keeps iterating until the objective is met — not just until the next reply.
Plugins and skills, cross-harness
Browse and install Codex, Claude Code, and Cursor plugins from a built-in marketplace, and manage skills that work across harnesses.
Talk instead of type
Voice dictation in the composer, powered by OpenAI or Groq transcription.
Knows when to get you
Desktop and browser notifications for approvals, questions, finished work, and failures — so agents run in the background without babysitting.
Survives a usage limit
A thread stopped by a subscription limit says so, can snooze until the window resets, and picks itself back up — or you hand it to another provider or account from the model picker.
Desktop, browser, and phone
Desktop
The full app for macOS, Windows, and Linux. Bundles the server, so it is also the host your other devices connect to.
Browser
MT Code serves its own web UI, so any browser that can reach the machine — over T3 Connect, SSH, or your own tunnel — gets the same app with nothing installed.
Phone
The T3 Code mobile app (iOS and Android) pairs with any T3-protocol server, including MT Code.
Free, and not the kind with a catch
MT Code runs on your machine and bills nothing — not for the app, not for the models, not for the computers you pair. There is no hosted service in the middle, so there is nothing to charge for.
The app costs nothing
Every feature runs on your own machine. There is no MT Code account to make, no paid tier, and nothing is hosted on your behalf.
The models are yours
MT Code drives the Claude, Codex, Cursor, Grok, and OpenCode subscriptions you already pay for. It never resells tokens or proxies a request.
Your machines are yours
Pair as many of your own computers as you like and send work between them. Nothing about that is metered.
MT Code vs T3 Code
MT Code is an open-source fork of T3 Code that adds its own features on top and pulls upstream in deliberately, not automatically. It installs alongside the official app with its own bundle ID and data directory, so you can run both.
| Feature | MT Code | T3 Code |
|---|---|---|
| Computer Use on your desktop | — | |
| Computer View — remote desktop of a thread's machine | — | |
| Computer History timeline | — | |
| Resume threads on restart | — | |
| Cross-thread references & messaging | — | |
| Goals that keep threads working | — | |
| Plugin marketplace & skills manager | — | |
| Voice dictation & realtime voice | — | |
| Continue a thread with another provider | — | |
| Usage-limit recovery & scheduled sends | — | |
| Send work to another connected machine | — | |
| Multi-provider agent control | ||
| Checkpoints, diffs & restore | ||
| Pair T3 Code's mobile app | ||
| Its own mobile app | — | |
| Hosted web app | — |
Full comparison in the README.
Start with MT Code
Free, open source, and ready for your existing agent subscriptions.