T3 Code is an agent harness control surface that lets you manage AI agents running on your machine from a mobile app (iOS/Android), a web app, or an Electron desktop app. It integrates with a range of agent providers - Claude Code, Codex, Cursor, Grok Build, OpenCode and Google Antigravity - so if those CLIs are installed and authenticated locally, T3 Code can control them. The project emphasizes performance, remote access, openness and a developer-first experience; it’s offered not as a commercial product but as an open tool meant to be forkable if users want to steer it differently.
Installation options include a one-line shell installer (or PowerShell on Windows), a t3 CLI to start the server and run background services, and packaged desktop installs via winget, scoop, Homebrew, .deb or AUR. Each supported provider requires local CLI auth (examples: codex login, claude auth login, agent login, grok login, opencode auth login; Antigravity uses Google sign-in). Full documentation lives in the docs/ folder and covers permissions, shortcuts, remote access, MCP connections, source-control integration and running as a background service. The project is very early, likely buggy, largely closed to major contributions for now, and building from source requires the vite-plus (vp) tool and following CONTRIBUTING.md; support is via Discord.
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