wire name	revit.selectionChanged
C# constant	BridgeMessage.Names.SelectionChanged
kind	event
direction	addin-to-panel
runs on	revit-ui-thread-inline

Raised from Revit’s own UIApplication.SelectionChanged, on Revit’s UI thread but OUTSIDE the external-event dispatcher.

What these words mean

kind. query = changes nothing a later message can observe. command = it does. event = the add-in pushes it, unasked. DECLARED per message, never derived from the prefix — the prefix is a THREAD decision.

runs on. revit-api-thread = inside the ExternalEvent dispatcher (ADR-4). revit-ui-thread-inline = on Revit’s main loop but OUTSIDE the dispatcher, straight from a callback Revit invokes. beside-the-dispatcher = off Revit’s main loop, on a thread-pool thread (ADR-11, ADR-31).

Source of truth: BuildPlan.Core/Bridge/BridgeMessage.cs in the plugin repository.