agentcookie install

You are helping the user install agentcookie on two machines that are both on the same Tailscale tailnet, then pair them, so that the sink's Chrome stays continuously in sync with the source's Chrome.

After install, the user does not touch agentcookie again. The source watches Chrome via fsnotify and pushes every cookie change to the sink within seconds. On Linux, the sink injects cookies via CDP into an already-running Chrome. On macOS, a LaunchAgent keeps the daemon running across reboots.

Inputs you need

1. Which machine is the source (the Mac the user logs into Chrome on, usually their laptop).
2. Which machine is the sink (where AI agents act - a Linux VM like Grok Bot, or a second Mac).
3. Tailscale is up on both.
4. On Linux: Chrome is running with --remote-debugging-port=9223 (or another port).

If any of these are missing, stop and ask.

Flow: Mac source to Linux sink (featured path)

Step 0: detect the lay of the land