T3 Code

T3 Code is an open-source "agent harness control surface" built by T3 Tools Inc. that lets developers orchestrate multiple AI coding agents — Claude Code, Codex, Cursor, Grok Build, OpenCode, and Google Antigravity — from a single unified interface. It is available as an Electron-based desktop app, a web app, and native iOS and Android mobile apps, and is MIT-licensed with the full source on GitHub.

What It Is

T3 Code sits between the developer and the underlying AI coding agents already installed on their machine. Rather than replacing those agents, it acts as a control plane: it detects whichever agents are authenticated locally and lets you switch between them, manage threads, review diffs, and commit code — all without touching a terminal. The project describes itself as inspired by tools like the Codex desktop app, Conductor, Claude Desktop, and Cursor Glass, but built to be more performant, remote-ready, and fully open.

The "Bring Your Own Subscription" Model

T3 Code does not resell tokens or impose quota caps. Users plug in the credentials they already hold for Claude Code, Codex, OpenCode, Cursor, Grok, or Antigravity. The app orchestrates those agents using the authenticated sessions on the local machine. Supported setup paths include:

• Claude Code — claude auth login
• Codex CLI — codex login
• OpenCode — opencode auth login
• Cursor — cursor-agent / agent login
• Grok Build — grok login
• Antigravity — Google sign-in via in-app settings (no CLI required)

The team states that more harnesses ship weekly.

Remote Access and Mobile-First Design

A distinctive feature of T3 Code is its remote access model. The backend server runs on the developer's machine, and the iOS and Android apps connect to it over the network — allowing developers to control agents running on their desktop from anywhere. The GitHub README documents this capability explicitly under "Remote access from a phone or another machine." Community tweets quoted on the homepage describe using it for iOS development from 2,000 miles away and running agent sessions from 36,000 feet on a phone.

Git Workflow Integration

T3 Code includes a built-in Git workflow layer. Each agent thread writes to its own branch, and a single button generates a pull request on GitHub with an auto-generated title, body, and changelog. Features include inline diff review before pushing, support for draft PRs, stacked PRs, and amend PRs, and integration with existing GitHub authentication — no terminal steps required.

Open-Source Architecture and Fork Model

The project is MIT-licensed and the team explicitly encourages forking. The homepage highlights three fork use cases: restyling the UI, wiring in custom agents or models, and self-hosting or distributing a custom build. The repository uses Vite+ (vp) as its build toolchain and requires Node.js 22.16+, 23.11+, or 24.10+. An install-free trial path is available via npx t3@latest, which launches the backend and local web app without installing the desktop client.

Update: v0.0.40

The latest release is v0.0.40, published on September 8, 2026. The repository was created in February 2026 and has accumulated over 22,000 GitHub stars and more than 5,400 forks in that window, according to GitHub metadata. The team notes the project is "very very early" and that large feature contributions are not yet being accepted, though small fixes may be considered. The homepage states the tool is "tolerated by over 200,000 devs" — a vendor-published claim on the marketing page.