Technical Feedback: Mac-to-Mac HID/Accessibility Bridge

Critique of a Hardware-Based Mac Control Loop

Your idea for a hardware bridge to control a Mac via HID/Accessibility without target software is technically sound but faces several 'real-world' hurdles.

Technical Critique:

  1. What breaks first? The Security/Privacy TCC prompts. Even with HID emulation, macOS will pop up 'Allow this device' or 'Accessibility access' prompts that require a physical click or existing trust.
  2. Security Concerns: This is a 'Rubber Ducky' style attack vector. Modern macOS (Sequoia+) has USB Restricted Mode, which blocks new HID devices if the Mac has been locked for more than an hour.
  3. Genuine Use: This would be invaluable for headless server recovery or automated testing of OCLP installations where the UI is unaccelerated and traditional VNC is too slow.

Original Question: "Seeking technical feedback on Mac-to-Mac control via accessibility + HID"

I’m working on a small hardware bridge that lets one Mac assist/control another via accessibility and HID, without installing software on the target machine.

The problem I’m trying to solve is reliable remote interaction with a second Mac in situations where software install/admin access is a bad fit.

I’d love feedback from people who’ve worked on accessibility automation, HID/device emulation, or low-latency control loops:

• what would you expect to break first?

• where would trust/security concerns show up?

• what would make this genuinely useful vs just a neat hack?

I’m especially interested in critique, not hype.

submitted by /u/birdychris68
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