Per-Dir API keys

How to easily setup per directory API keys to, for example, scope different AI subscriptions in different folders. This will use the CLI direnv to accomplish that.

direnv Setup

1. Install direnv: https://direnv.net/docs/installation.html
   • Use brew install direnv for macOS.
2. Hook direnv into your shell: https://direnv.net/docs/hook.html
   • Add eval "$(direnv hook zsh)" in your ~/.zshrc file on macOS.
3. For shells that have launched without using cd (like in agent-storm), you'll need to immediately trigger direnv.
   • On macOS, add _direnv_hook after eval "$(direnv hook zsh)" in your ~/.zshrc file.
4. Open a new terminal tab or source your shell profile to load the change.
   • Run source ~/.zshrc on macOS.

Per-Dir Setup

1. Create a .envrc file in the dir.
2. Export a variable in that file: export ANTHROPIC_API_KEY="<something>";.
3. Navigate to the folder that contains that .envrc.

Now when you cd into a dir that is an ancestor of folder containing the .envrc file (or multiple nested .envrc files), your env will be populated with those variables.

If you get a Run direnv allow to approve its content error, just run direnv allow (only needed once per folder).

Setup worktree root

If you use git worktrees frequently, you'll need to allow direnv on every new worktree. This fixes that.

1. Create a direnv config file:
   1. mkdir -p ~/.config/direnv
   2. touch ~/.config/direnv/direnv.toml
2. Trust the root of your worktrees but adding the following to that direnv.toml file:

   [whitelist]
   prefix = ["<replace-with-absolute-path-to-worktree-root>"]
3. Make sure to replace replace-with-absolute-path-to-worktree-root above with the correct path.