I was migrating some legacy code recently, and the big thing was making sure I did not introduce any regressions. So I ran the service locally and pointed the e2e tests at it from a separate project.
The tests were failing and I had no idea why. I did not change any code, so it should have just worked!
So I opened a Claude session for each project and had them talk to each other to figure out what was going on. That was the cool part. They actually communicated back and forth, and even pushed back on each other.
At one point the service session refused to update the config because it said it was a security concern. I had to step in and say we are just running locally, so no concerns there. Then it went ahead.
Turns out the service was deployed with the wrong config. I fixed it, ran the tests again, and they passed.
It felt like watching two teammates debug together. I just had to step in once to unblock them!