Desktop

The desktop app is the host. Agents run on this machine. Start chatting right away.

Install

The app is coming soon. Settings can install the CLI for you — that is the binary reachability needs.

First launch

1. Spellbook shows the agents from the public ACP registry.
2. Select the ones you already use (Claude Code, Codex, Grok, Gemini, …).
3. Continue installs them and opens New session.

The first selected agent is already in the setup bar. Pick a folder, then send a prompt. Add or remove agents later from Manage agents in the command menu.

Custom agents

Anything that speaks ACP can be added as a custom agent: command, args, and env. Registry entries that only ship a binary download are skipped for now — npx and uvx work.

This machine as a host for others

Click this machine's name at the left of the status bar and turn on Reachable from your devices. That starts spellbook gateway here, and every Spellbook signed in to your account can open chats on it. Quitting the app does not stop it; turning it off does. See Pair a host.

Cloud is optional

Sign in from Account when you want a hosted sandbox in the same catalog. Local agents keep working either way. See Cloud.