That's interesting to me, because Claude never creates the .env files for me. It will create the .env.example with defaults in it. When I ask it to create the .env, it will reply with the bash to use to copy the .example file, but it wont execute it for me, even when requested.

It read the .env file after creation my creation at its prompting, spreading its contents into many places.

Unfortunately, the .env anti-pattern is endemic throughout many projects, and whether Claude creates the .env from scratch or merely the .env.example, it will end up feeding the .env back to Anthropic with enough interaction, apparently. And developers should expect all files in their work directory to be read by Claude, that's not so much a fault of Claude as it is with the .env anti-pattern.