Same experience, here. Very hard to base on facts, because every problem and prompt is an individual use-case and measuring agent reasoning quality is notoriously difficult anyway. But I spend a lot of time with Claude and my overall "feeling" fully matches your description. Quality has deteriorated, thinking takes longer and results become shallow. Something is off...
- Compile a resulting set of environment variables from a hierarchical list of `<name>.env` files.
- Dependencies can form a tree or DAG (directed acyclic graph).
- Smart environment selection via builtin FZF (fuzzy find).
- Side-by-side edit of trees for easy comparison.
- [direnv](https://direnv.net/) integration
- [JetBrains](https://www.jetbrains.com/) integration via [EnvFile](https://plugins.jetbrains.com/plugin/7861-envfile) plugin.
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