diff --git a/internal/channels/telegram/handlers.go b/internal/channels/telegram/handlers.go
index 6dca1d90..62373b69 100644
--- a/internal/channels/telegram/handlers.go
+++ b/internal/channels/telegram/handlers.go
@@ -226,9 +226,14 @@ func (c *Channel) handleMessage(ctx context.Context, update telego.Update) {
 	}
 
 	// Compute sender label for group context (used in history + current message annotation)
-	senderLabel := user.FirstName
+	displayName := strings.TrimSpace(user.FirstName + " " + user.LastName)
+	senderLabel := displayName
 	if user.Username != "" {
-		senderLabel = "@" + user.Username
+		if displayName != "" {
+			senderLabel = "@" + user.Username + " (" + displayName + ")"
+		} else {
+			senderLabel = "@" + user.Username
+		}
 	}
 
 	// --- Group mention gating (matching TS mentionGate logic) ---
diff --git a/internal/channels/whatsapp/whatsapp.go b/internal/channels/whatsapp/whatsapp.go
index 7429c8b8..8ead7afe 100644
--- a/internal/channels/whatsapp/whatsapp.go
+++ b/internal/channels/whatsapp/whatsapp.go
@@ -274,6 +274,11 @@ func (c *Channel) handleIncomingMessage(msg map[string]any) {
 		cc.EnsureContact(ctx, c.Type(), c.Name(), senderID, senderID, metadata["user_name"], "", peerKind, "user")
 	}
 
+	// Annotate with sender identity so the agent knows who is messaging.
+	if senderName := metadata["user_name"]; senderName != "" {
+		content = fmt.Sprintf("[From: %s]\n%s", senderName, content)
+	}
+
 	c.HandleMessage(senderID, chatID, content, media, metadata, peerKind)
 }