It sounds like there's interest in a plugin system which would handle things like this? I agree, this doesn't seem like it makes sense to be built into a tool

It sounds like there's interest in a plugin system which would handle things like this? I agree, this doesn't seem like it makes sense to be built into a tool like poetry - it's a little too magic. And I'd have a use case for doing different kinds of runtime configuration (not environment variables) if it had a hook system.