T3 Code

What it does

An open-source app for running and watching the coding agents already set up on your computer, from a desktop app, a web app or iOS and Android apps. It drives Claude Code, Codex, Cursor CLI, Grok Build, OpenCode, Google Antigravity and fx using the subscriptions you already have. The README says nothing is being sold, and warns: "We are very very early in this project. Expect bugs." MIT licensed.

Who it's for

People who already use Claude Code, Codex or another CLI agent and want a graphical app to manage sessions, or to check on and steer them from a phone.

How to set it up

1. Install and sign in to at least one supported agent first, for example:

   bashCopy

   claude auth login   # Claude Code
   codex login         # Codex CLI
   agent login         # Cursor CLI
   opencode auth login # OpenCode

2. Install the command-line version on macOS or Linux, then run t3 to start the server and open the local web app:

   bashCopy

   curl -fsSL https://t3.codes/install.sh | sh
   t3

3. On Windows, in PowerShell:

   powershellCopy

   irm https://t3.codes/install.ps1 | iex

4. To try it once without installing anything, run npx t3@latest. t3 service install keeps it running in the background and t3 update moves to a newer release.

5. Or install the desktop app from GitHub Releases or a package manager:

   bashCopy

   brew install --cask t3-code     # macOS
   winget install T3Tools.T3Code   # Windows
   scoop install extras/t3code     # Windows (scoop)

6. Remote access from a phone, permission modes and connecting outside agents over MCP are covered in the docs folder of the repo (there is no docs site yet). Install scripts piped to sh run code from the internet, so read them first if that matters to you.

Check the official T3 Code docs for the latest steps.

Example prompts

Open this repo in T3 Code with Claude Code and plan the refactor of src/api before changing anything.

Run Codex on the failing test in a new session while I keep working in the Claude session.

Summarize what each open agent session changed today.

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Free: MCP Starter Checklist

After you set this tool up, use the one-page checklist so your next MCP server doesn't fail on first connect.