Build systems that keep improving the work
One useful version of compound engineering is to use agents, automations, callbacks, and scheduled jobs to make a process a little better without remembering to do everything manually.
In some codebases, I run a weekly job that inspects recent changes and produces an architecture overview, a changes summary, and a map of how the services fit together. Future agents can use that context directly. The same material also becomes a small interactive site that the team can explore.
I now ask what small system I can build once that will keep improving the process. Not everything needs to be a chat interaction.