>a codex subagent in Claude Code

That's a really fascinating idea.

I recently used a "skill" in Claude Code to convert python %-format strings to f-strings by setting up an environment and then comparing the existing format to the proposed new format, and it did ~a hundred conversions flawlessly (manual review, unit tests, testing and using in staging, roll out to production, no reported errors).

Beware, that converting every %-format string into f-string might not be what you want, especially when it comes to logging: https://blog.pilosus.org/posts/2020/01/24/python-f-strings-i...