And others pull regularly from the pool? how are knowledge and skills continuously updated? I was thinking these necessarily need to be server side (like the main project under discussion) for it to be non-clunky for many users, but potentially git could work?

Like, let's take a company example - gitlab. If an agent had the whole gitlab handbook, then it'll be very useful to just ask the agent what and how to do in a situation. The modern pi agents can help build such a handbook with data fed in all across the company.