Spellbook
A client for coding agents. Desktop, a browser, and a phone open the same sessions — the machine that already runs them stays the host.
Spellbook speaks the Agent Client Protocol. Grok, Claude, Codex, and any other ACP harness stay on the computer that runs them. The browser and the phone are other windows onto that session, not a second runtime.
The window is a session list, the chat, and the workspace beside it: files, diffs, and a browser. Permissions and plans show up in the thread.
It is still coming together.