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TYBA runs several coding agents at once — Claude Code, Codex — each in an isolated git worktree, inside an OS sandbox, behind an approvals inbox. It exists because running agents in parallel has two problems nobody solves together: they trample each other, and you don’t know what they are doing until it has already happened.

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What it guarantees

The system enforces the jail

The jail is enforced by the kernel, not asked for in a prompt. A bash -c the agent spawns inherits the same jail.

Many at once, no trampling

One worktree per session. Agent A can’t see or clobber B’s tree, and neither touches your working copy.

Review before anything leaves

The diff is built from local .git alone. The button that approves a push lives inside it.

An inbox, not N terminals

You answer whoever is blocked, without babysitting whoever isn’t.
Fail-closed all the way down: a policy that doesn’t apply takes the session down. An approval channel that breaks becomes a denial. There is no path where failure turns into permission.

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Where to start

Installation

macOS, Linux and Windows — plus the two things you install yourself: an agent and a git repo.

First session

What happens between describing the task and the code existing.

Risk classification

Exactly what goes through on its own and what waits for you.

Platforms

What the sandbox guarantees on each system — and where it guarantees less.

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Before you install

The guarantee is not the same on all three systems. On macOS and Linux the agent’s reads are deny-by-default: your ~/.ssh isn’t forbidden, it doesn’t exist. On Windows reads are allow-by-default, with a deny list of known secrets — your other repositories and the .env files of other projects are readable.It’s all in Platforms. Read it before, not after.

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About this documentation

It describes what runs today, in 0.6.0. What doesn’t exist yet doesn’t show up here as if it did — same rule as the site: nothing here is a promise. The name comes from Tupi: tyba is the suffix of abundance, the place where things gather.