MT Code

MT Code is a free, open-source desktop app for running and controlling coding agents — Claude Code, Codex, Cursor, Grok Build, and OpenCode — from one place. It is Munim Technologies' fork of T3 Code with extra features and fixes, and anyone can download and use it.

Download

munimtech.com/mt-code — or grab installers straight from GitHub Releases:

• macOS (Apple Silicon): MT-Code-<version>-arm64.dmg
• Windows (x64): MT-Code-<version>-x64.exe

Builds are currently unsigned:

• macOS: if Gatekeeper warns, right-click the app → Open (first launch only).
• Windows: if SmartScreen warns, choose More info → Run anyway.

The app auto-updates from this repository, so you get new MT Code features and fixes as they ship.

Use it in the browser

mtcode.munimtech.com hosts the MT Code web app. Run the desktop app (or npx t3@latest) on your machine, generate a pairing link from Settings → Connections, and control your agents from any browser — including your phone. The backend must be reachable over HTTPS (Tailscale Serve or a tunnel work well); see remote access.

Before you start

MT Code drives agents you already have. Install and sign in to at least one provider CLI:

• Claude: install Claude Code and run claude
• Codex: install Codex CLI and run codex login
• Cursor: install Cursor CLI and run agent login
• Grok Build: install Grok Build CLI and run grok login
• OpenCode: install OpenCode and run opencode auth login

Your existing subscriptions are used directly — MT Code sells nothing and adds no accounts of its own.

What MT Code adds over T3 Code

• Resume on restart — threads and agents that were running when the app closed automatically pick up where they left off at the next launch.
• Cross-thread references — type # in the composer to reference another thread; the agent can read that thread's transcript.
• Thread-to-thread messaging — agents can list sibling threads and send messages between them, so parallel work can coordinate.
• Better "Open in editor" on macOS — detects Cursor, VS Code Insiders, VSCodium, Trae, Kiro, and JetBrains IDEs by their app bundles, even when their CLI shims aren't installed.
• Installs alongside official T3 Code — its own bundle ID (com.munim.t3code) and its own isolated data directory, so it never touches the official app's settings or sessions.

Everything upstream T3 Code does — multi-provider agent control, checkpoints and diffs, remote access from the web and mobile apps, Connect tunnels — works here too.

Documentation

Full docs live in docs/:

• Install and first run
• Permission modes
• Keyboard shortcuts
• Desktop notifications
• Remote access from a phone or another machine
• Thread messaging
• Keeping app and server in sync
• Source control integrations
• Multiple accounts: Codex · Claude

Building from source? Start at docs/internals/overview.md.

Relationship to upstream

MT Code tracks pingdotgg/t3code nightlies and regularly merges upstream. Features built here are offered upstream as PRs when they fit; some MT Code features started as unmerged upstream PRs we adopted. Bug reports about MT Code builds belong on this repo's issues — please don't file MT Code problems upstream.

MT Code exists because T3 Code is truly open. Credit and thanks to the T3 team.