The full disk access permission is something you give to backup software.

If you give full-disk access to Meta software running on your main computer, Meta is not going to respect your privacy.

> Friday’s [full-disk access] announcement comes two weeks after tech columnist Jason Aten said that Meta’s new general-purpose AI agent Muse sent him an unsolicited notification referencing a thread between him and a co-worker over Apple Messages. Aten said he never granted Muse permissions to read his messages and had assumed they were off-limits. Social media last week blew up with masses of people who agreed and said the incident showed that AI assistants given access to calendars, emails, messages, shopping accounts, and other resources are akin to a skill saw or other power tool. While potentially useful, they can do real damage if not used carefully.

https://arstechnica.com/security/2026/10/apple-changes-full-...

If you want to know why Apple is suddenly not happy about the way the full-disk access permission is being abused, look no further.

> Social media last week blew up with masses of people who agreed and said the incident showed that AI assistants given access to calendars, emails, messages, shopping accounts, and other resources are akin to a skill saw or other power tool. While potentially useful, they can do real damage if not used carefully.

This brought to mind Neal Stephenson's essay "Unix - The Hole Hawg of Operating Systems" from back in the day (1999):

> I myself used a Hole Hawg to drill many holes through studs, which it did as a blender chops cabbage. I also used it to cut a few six-inch-diameter holes through an old lath-and-plaster ceiling. I chucked in a new hole saw, went up to the second story, reached down between the newly installed floor joists, and began to cut through the first-floor ceiling below. Where my homeowner's drill had labored and whined to spin the huge bit around, and had stalled at the slightest obstruction, the Hole Hawg rotated with the stupid consistency of a spinning planet. When the hole saw seized up, the Hole Hawg spun itself and me around, and crushed one of my hands between the steel pipe handle and a joist, producing a few lacerations, each surrounded by a wide corona of deeply bruised flesh. It also bent the hole saw itself, though not so badly that I couldn't use it. After a few such run-ins, when I got ready to use the Hole Hawg my heart actually began to pound with atavistic terror.

> But I never blamed the Hole Hawg; I blamed myself. The Hole Hawg is dangerous because it does exactly what you tell it to. It is not bound by the physical limitations that are inherent in a cheap drill, and neither is it limited by safety interlocks that might be built into a homeowner's product by a liability-conscious manufacturer. The danger lies not in the machine itself but in the user's failure to envision the full consequences of the instructions he gives to it.

* http://www.team.net/mjb/hawg.html

* 2021: https://news.ycombinator.com/item?id=28015229

I think that was the initial concept of what "Full Disk Access" was supposed to be, but I've run into needing to give some of my own apps full disk access for very innocuous reasons. Recently, I wanted to build a little app to give me a Time Machine on/off switch by calling "tmutil enable/disable". A single on/off command with no need to access any of my data, but its use was gated behind needing Full Disk Access. Hopefully if Apple is rethinking Full Disk Access permissions they will rethink better ways to provide these sort of permissions.

FDA is in fact not required for backup software nor should it be. For example, Bombich is granted the com.apple.security.files.all entitlement for Carbon Copy Cloner, because backup software needs to just work without the user chancing a miss on the TCC prompt when they first set it up only to find out the app didn't backup their photos after losing all their data.

Apple stopped adding protected file-system domains for some reason, and have only expanded TCC to entail more vague and nonsense monikers. Sandboxed apps of importance like Messages, Notes, Reminders, and so on, all just end up under the "Full Disk Access" umbrella because they all store their databases in ~/Library/Containers, and FDA is really the only thing gating access to that. Apple should just start pushing the permissions one level down into that folder. Do I want to give an agent access to my Safari history, but not my messages? Too fuckin bad! No way to slice that right now, it gets full disk access and can access anything.

The problem I have is that when I ssh into my mac, I want to be able to control software from the command line and having a popup authorization window that just halts the software being controlled is not good for me. I'm okay with having the authorization, but they need to make it visible to ssh users when ssh'ing in.

Counterpoint:

https://pxlnv.com/blog/macos-full-disk-access-restrictions/

> ...the uses of Full Disk Access go well beyond the category of backup apps, and it is worrisome to see Apple give it such a limited frame. I have given that permission to disk management utilities, Sketch, Terminal, and other apps I do not want to be throwing permissions requests as I move around my drives. Is Apple suggesting this capability could be limited in the future to backup applications alone? I do not like that.

If Full Disk Access were, in future, to be something that I could not grant to (for instance) the Terminal, because it is not a backup app, that would severely limit my ability to do work on a Mac, both as hobbyist and as computer professional.

I agree that the agent situation is a fairly serious concern; I just don't want to see Apple throw the baby out with the proverbial bathwater.

Another case of "This is why we can't have nice things." Application developers who feel entitled to accessing everything they can on the user's computer, without obtaining consent from the user. So, now we have to have these consent walls everywhere. Way to go, application developers.