bb

bb is an agentic IDE that can control itself. You can seamlessly orchestrate all of your favorite coding agents together and have them programmatically use bb too.

Every surface — the desktop app, web app, CLI, and HTTP API — is a first-class way to drive bb. Work runs in threads you can follow live, steer at any point, or hand off to another agent.

Note

bb is in active development. Core architecture is stable, but workflows and surfaces are still evolving.

Use bb

Download the desktop app

The recommended way to start using bb is the desktop app:

Download the latest desktop app

The desktop build is currently macOS Apple Silicon (arm64) only. Intel Mac and Linux users should run bb with npx instead. On Windows, run bb inside WSL2 (Windows Subsystem for Linux): install WSL2 first, then run the same npx command below from your WSL2 (Linux) shell. Native Windows PowerShell and CMD are not supported.

Or run it anywhere with npx

npx bb-app@latest

Then open http://localhost:38886.

bb uses the provider CLI you already have authenticated.

For install requirements, provider setup, configuration, and package-focused docs, start with packages/bb-app.

Telemetry

Production runs (the desktop app and npx bb-app) send anonymous usage telemetry (app starts and thread creation counts) to help us understand adoption. Identification is a random per-install id stored in your data dir — no user, host, project, or workspace data is ever attached. Development/source runs never send. Opt out any run with BB_TELEMETRY=false. See apps/server/src/services/system/telemetry.ts.

Development

Use the development loop when working on bb itself:

pnpm dev

That starts the Vite app and proxies API and WebSocket traffic to a separate dev server. The launcher prints the actual ports at startup. Each checkout gets a data directory under ~/.bb-dev/<checkout-instance>/ and deterministic high ports derived from the checkout path. The checkout instance id is the sanitized path to the checkout, relative to your home directory, plus a short hash suffix. Separate worktrees can run alongside each other and the packaged npx bb-app@latest instance.

To run that same source dev server with the Electron desktop shell:

pnpm dev:desktop

This uses scripts/bb-dev-app current --desktop, which stops stale launcher sessions, checks dependencies and native modules, starts the source dev server, then opens the desktop shell against that dev app. The launcher prints the web URL but does not open a browser unless you pass --open.

To use the dev app from another machine, for example over Tailscale, run:

pnpm dev

Then open http://<remote-host-or-tailscale-ip>:<app-port>. Source dev binds the browser app to all interfaces and uses the browser host for WebSockets by default.

To use the component storybook from another machine, run:

pnpm storybook

Ladle also binds to all interfaces and configures its HMR WebSocket to use the browser's current host instead of localhost.

Development behavior is intentionally split:

• the app hot reloads itself
• the server does not hot reload
• the host daemon does not hot reload

When you want the server and host daemon to pick up the latest build output, use:

pnpm dev:restart
pnpm dev:restart-server
pnpm dev:restart-host-daemon

These rebuild first, then restart only the targeted stateful services.

To test the release-style package launcher from a source checkout:

pnpm start

That builds the local bb-app package artifacts and runs packages/bb-app/dist/bb-app.js, matching the published npx bb-app@latest path without downloading from npm.

pnpm bb --help            # built CLI, targets the default/prod instance
pnpm reset                # clear production state

pnpm bb:dev --help        # source CLI, targets this checkout's dev instance
pnpm reset:dev            # clear this checkout's dev state

pnpm reset:all            # clear both production and dev states

These reset commands prompt for confirmation before deleting anything.

Repository Overview

See Repository overview for the monorepo package and app map.

System Overview

See System overview for runtime architecture, data model, and component boundaries.

Further Reading

• Vision
• Platform support
• Configuration
• Using bb on multiple devices
• Worktrees and setup scripts

Contributing

See CONTRIBUTING.md for contribution guidelines.