This works super well as a bookmarklet but sometimes on android I want to share a url from another app and have it auto open in the kagi summarizer.
I tried to make a PWA to do this but FF for android doesn't have the share_target functionality to share to it. So the PWA works fine but only if it is installed in chrome, which I don't want.
I'm looking for an app where I can share text/url to it and it will automatically append that text to a url and open it in the browser.
Have a look at Automate (like Tasker but with free features).
It has a Content Shared module as input. Then you can process and output its text. Might be worth a try for what you're trying to do.