T3 Code

T3 Code is an "agent harness control surface" for developers who already use AI coding agents like Claude Code, Codex, Cursor, Grok Build, OpenCode, or Google Antigravity on their machine. Instead of being tied to one editor's UI, T3 Code gives you a mobile app, web app, and Electron desktop app to control whichever agent CLIs are installed and authenticated locally. It's built by the team behind other developer tools who wanted a better, remote-capable experience than existing agent front ends offered.

The project doesn't run its own AI models. It's a control layer on top of agent CLIs you install and authenticate yourself (Codex CLI, Claude Code, Cursor CLI, Grok Build CLI, OpenCode, Antigravity). If one of those is set up on your machine, T3 Code can drive it.

Key features

• Multi-agent support: works with Codex, Claude Code, Cursor, Grok Build, OpenCode, and Google Antigravity, as long as each is installed and authenticated on your machine.
• Multiple front ends: iOS app, Android app, web app, and an Electron-based desktop app, all controlling the same underlying agent harness.
• Remote access: you can reach and control your local agents from a phone or another machine, not just the computer they're running on.
• Local-first backend: npx t3@latest spins up the backend and local web app directly on your machine, no account or hosted service required to try it.
• Background service mode: T3 Code can run as a background service so agents stay controllable without keeping a terminal window open.
• Source control integration: built-in support for working with source control alongside agent sessions.
• Multiple accounts per provider: separate documentation and support for running multiple Codex or Claude accounts.
• Open source under MIT: the full source is available so you can fork it if the project's direction ever changes.

Ideal use cases

T3 Code fits developers who already use one or more agent CLIs (Claude Code, Codex, Cursor, etc.) and want a single, consistent interface across devices instead of juggling separate desktop apps or terminal sessions for each provider. It's a good fit if you want to kick off or check on an agent task from your phone while away from your desk, or if you want a background service that keeps agents running without an active terminal.

It's also relevant if you've tried tools like the Codex desktop app, Conductor, Claude Desktop, or Cursor Glass and want something more open that you can inspect or fork.

It is not a good fit if you don't already have at least one supported agent CLI installed and authenticated. T3 Code doesn't provide AI capability on its own; it's a control surface, so you need an underlying provider account and CLI set up first. It's also early-stage software: expect bugs, and the project is largely closed to outside contributions beyond small fixes, so it's not ideal if you want to build custom features and get them merged upstream.

Installation

Before using T3 Code, install and authenticate at least one supported provider:

• Codex: install the Codex CLI, then run codex login
• Claude: install Claude Code, then run claude auth login
• Cursor: install the Cursor CLI, then run agent login
• Grok Build: install the Grok Build CLI, then run grok login
• OpenCode: install OpenCode, then run opencode auth login
• Antigravity: enable it in Settings, install it, and sign in with Google (no CLI needed)

The fastest way to try T3 Code is to run the backend directly with Node.js (requires Node 22.16+, 23.11+, or 24.10+):

npx t3@latest

This launches the backend and a local web app on your machine. Run npx t3@latest --help for the full CLI reference.

For a persistent desktop install, grab the latest release from GitHub Releases, or use a package manager:

# Windows
winget install T3Tools.T3Code

# macOS
brew install --cask t3-code

# Arch Linux (stable)
yay -S t3code-bin

# Arch Linux (nightly)
yay -S t3code-nightly-bin

If you want to build from source, T3 Code uses Vite+ and its vp command-line tool:

# macOS / Linux
curl -fsSL https://vite.plus | bash

# Windows
irm https://vite.plus/ps1 | iex

# then install dependencies
vp i

Read CONTRIBUTING.md before filing bugs or opening pull requests, since the project is currently only accepting small fixes rather than large features.