Ask HN: What is your best hack to keep your agent's context in sync?

A lot of people manually maintain markdown files and use them to sync context. Some people even use Obsidian.

I was wondering what is the best hack you have discovered to keep the agents in sync? And how does it perform, does it work reliably well?

One of the problems I face is multiple agents writing to a common memory which can lead to unwanted memory overwrites without any trace.