Allow automatically opening in the in-app browser (claude, codex)

[nesl247]

When using Claude or Codex it would be nice if the browser it opened in was the in-app browser instead of my default system browser. This would let me keep the context of what I'm reviewing to that particular session.

[backnotprop]

Fair request, thanks. Today PLANNOTATOR_BROWSER lets you point the opener at any app or executable, so if the agent app you use exposes an openable binary or URL handler you can route Plannotator there already. True in-app opening depends on what Claude and Codex expose for programmatic URL opening from a hook or extension context; we will look at what is possible per host. Leaving this open as a feature request.