Tesser

Tesser gives each git worktree its own Linux machine in the cloud (“a box”). Your coding agent (Claude Code, Codex, or anything) runs tesser commands that copy the laptop’s worktree to the box, and runs dev servers/test suites/builds on there! tesser then automatically proxies the dev server to your laptop.

tesser exec -- pnpm test     # runs the tests on a box and streams the output back
BOX=$(tesser dev web)        # starts the dev server on a box
open http://localhost:3000   # shows that dev server

But why?

Tesser lets you run several parallel agents at the same time without them competing for your laptop. Each worktree has its own VM, so ten dev servers do not share ports, CPU, or memory, and your browser still uses localhost for all of them. Usage is metered per second and shown on the dashboard. The pricing page has the rates, and every org starts with $10 of credit.

Where to go

Quickstart

Install the CLI, sign in, and get a dev server running on a box.

Let your agent drive the boxes

Install the tesser skill so Claude Code or Codex can run the boxes for you.

CLI reference

Every command and its flags.

How it works

What runs on the laptop, what runs on the box, and what the control plane does.

Where your code goes

Every hop your source takes, and what the control plane receives.

Run boxes in your own AWS account

Run the boxes in your account while Tesser hosts the control plane.

Get started

Guides

Reference

Concepts

But why?

Where to go

Quickstart

Let your agent drive the boxes

CLI reference

How it works

Where your code goes

Run boxes in your own AWS account

​But why?

​Where to go

Quickstart

Let your agent drive the boxes

CLI reference

How it works

Where your code goes

Run boxes in your own AWS account

But why?

Where to go