I am not sure using sandbox-exec is a good security architecture for AI agents. It sure is convenient and available to everyone right now. I've made another comment elsewhere in this discussion about what I think "deprecated" means - it is a sharp tool that could break if not tracking everything that changes, including every change in a SW update. It is also easy to get wrong if there is not a "(default deny)" in the profile. An agent could escape if they can find a mach service or some other system call coordinated proxy service. Java, Silverlight and Flash had backdoor communication mechanisms with other instances of themselves that could be abused.
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