Anthropic kept its Rust migration focused on porting the existing system, resisting feature additions and behavioral changes.

“Is it, is it a pure rewrite? So we actually, we did. It was a pure... It was, um, maybe the thing that I would call it is, like, a port. What we did was we, we did exactly that. We, like, resisted the urge- [laughs]...”

“on all these things.”

“Then, a- and because what the team already had to keep up with was little, like, SWAT team that we put together to go and do this was doing this while the whole rest of our team was, like, building features into the API, right?”

“And they did all the, like, static analysis stuff. They would yell at you because you built a feature over here and you didn't consider Rust over there, right? And, like, they dealt with all of that.”

“But they resisted the urge to add features themselves or, like, make the system different.”