“Agents add a twist. They work in parallel, but my attention doesn't. Every switch between sessions meant reloading that session into my head: what the agent was doing, what I'd asked, what had changed.”

The human is the shared resource agents contend for. Context-switch cost is context loading for the person, mirroring the agents' problem. His rule: delegate what you can verify, never delegate what you're trying to learn, and treat skimming as a signal to stop. Cites Bainbridge's ironies of automation and the METR slowdown study. Pairs with the existing Abralo "3 or 4 agents" finding, which hit the same ceiling from the tooling side.