Great article! I have similar observations and techniques and Claude Code is exceptionally good - most of the days I'm working on multiple things at once (thanks to git worktrees) and each going faster than ever - that's really crazy.

For the "sub agents"thing, I must admit, that Claude Code calling o3 via sigoden/aichat saved me countless of times!

There are just issues that o3 excells at (race conditions, bug hunting - anything that requires lot of context and really high reasoning abilities).

But I'm using it less since Opus 4 came out. And of course its none of the sub-agent thing at all.

I use this prompt @included in the main CLAUDE.md: https://github.com/pgflow-dev/pgflow/blob/main/.claude/advan...

sigoden/aichat: https://github.com/sigoden/aichat