How do you keep two coding agents from editing the same paths?

I’ve been watching teams run agents in separate IDEs on separate machines on roughly the same repo.

Git helps after the fact. It doesn’t stop two agents from rewriting the same auth layer in parallel, or from one agent treating the other’s unfinished work as ground truth.

Curious what’s worked for you in practice:

• Do you assign path ownership by hand (person A owns api/, person B owns web/)?

• Do you only let one agent touch the repo at a time?

• Or do you put both agents in one shared environment so there’s a single tree?

If you’ve already hit this, what broke first — merge noise, duplicated features, or secrets leaking into the shared setup?