When did this happen? I think I only started noticing around a month ago that Claude had some new system prompts or some other mechanism that heavily encouraged it to not read secrets. Around the same time I also noticed that if it did read any secrets they were ****'d out in the logs.
This was yesterday. It's an early stage project and I would have never created a .env file on my own, but I had let Claude get pretty far along on the PLAN.md before I decided to clean up a bit.
Nothing lost for me here, fortunately, but it's definitely a big foot gun that I've never seen mentioned in any of the Vibe Coding or LLM Agent Coding training courses that the security team has forced me to do.