diff --git a/server/hooks.go b/server/hooks.go
index 5ce274d..33349e6 100644
--- a/server/hooks.go
+++ b/server/hooks.go
@@ -162,7 +162,9 @@ func (p *Plugin) MessageHasBeenPosted(c *plugin.Context, post *model.Post) {
     }
 
     // Wake or refresh the engagement session.
+    // Fresh @-mention resets conversation history so old context doesn't bleed.
     if mentioned {
+        _ = p.conversationStore.Reset(post.UserId, post.ChannelId)
         p.engagementEngine.Wake(post.UserId, post.ChannelId)
     }