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Here's an example from last week. I worked on a fairly complex feature. First, iterating on the spec. Lots of research, going back and forth with the agent, finally coming up with a decent high-level design doc.

Then, implementation. Rust project, Opus 5.5, Claude Code, subagents, a bunch of useful skills, a well-crafted AGENTS file and, most importantly, a fully self-contained end-to-end testing suite with hundreds of tests that the agent can run.

The implementation was done, and I spent several days reviewing it. Just to be clear, my goal wasn't to understand every single line, but to build mental models about the abstractions that the LLM generated.