A new version of the @aturi.to/waypoints package is out (v0.1.4), featuring optional brand icons and support for compose intent across clients that have it. What does this mean? You can provide links that open in a user's preferred Bluesky client that will open the post composer with prefilled text.
aturi.to
Developer Docs · aturi.to
Add Atmosphere “Open in…” links, smart client recommendations, compose intents, and AT-URI resolution to your own app with the @aturi.to/waypoints packages and the public Resolve API.