I control 10+ browsers with AI agents from one terminal

Description and use

The author built Kagemusha to turn each website into a separate Mac app, letting AI agents work in the background without stealing focus, enabling parallel browser tasks.

Problem

Managing multiple browser‑based tasks manually is time‑consuming and limits parallelism; existing AI‑browser integrations either expose the entire browser, require re‑login, or steal focus, preventing concurrent work.

Outcome

Kagemusha enabled the author to run multiple AI‑driven browser tasks in parallel without interrupting their workflow, using 23 GB RAM for 24 apps on a MacBook Pro M4 Max.

Workflow

• 1. Sign in to each service manually in its dedicated Kagemusha app.
• 2. Configure the app to allow or disallow AI agent control.
• 3. From a terminal, issue commands to the agent specifying the target app and task.
• 4. The agent performs actions inside the selected app without stealing focus.
• 5. Monitor progress while continuing other work.

Evidence

I sign in to each app once, the normal way, with my password manager or a passkey.

Source

When the agent works, it works inside that one app, in the background. My screen stays mine.

Source

I had 24 of these apps open at once on my MacBook Pro (M4 Max, 128 GB of memory), using about 23 GB in total, while the same Mac was running around 20 local development servers.

Source