Agent harness control surface · desktop, web, mobile
Six harnesses.
One control surface.
T3 Code controls the agents already set up on your machine — from a desktop app, a web app, or your phone. It works with your existing subscriptions on Claude Code, Codex, Cursor, Grok Build, OpenCode and Google Antigravity.
“Wait, what are you selling me?”
Nothing.
“We built T3 Code because we wanted the best possible development experience with agents … If we ever go the wrong direction, we want you to have everything you need to fork and build the editor that you want.”
— the project README, answering its own first questionFour positions on every channel
same switch label, different harness underneathMaster · new threads
Shipped default: Full access
Set it once. Projects can override the environment default, and threads you already started keep their own mode.
Settings → General → New threads → PermissionsEvery hollow cell is quoted from the project’s permission-modes doc. Unmarked cells follow the mode’s general description; the doc adds that providers enforce permissions differently and some read-only actions can proceed in Supervised. Permission modes never stop the agent from asking questions about the task.