One workflow mapped the right Rust lifetime for every struct field in the Zig codebase. The next wrote every .rs file as a behavior-identical port of its .zig counterpart, hundreds of agents working in parallel with two reviewers on each file.
Rust lifetime inference across a 750k-line codebase is one of the hardest mechanical tasks in systems programming — it requires deep semantic understanding of ownership patterns. That Claude could map lifetimes wholesale across a large Zig codebase, then have agents review each file in parallel, suggests a qualitative jump in code comprehension capability.