diff --git a/packages/ui/src/types.ts b/packages/ui/src/types.ts
index 1347851..2f4298a 100644
--- a/packages/ui/src/types.ts
+++ b/packages/ui/src/types.ts
@@ -33,7 +33,7 @@ export interface PanelAgentAdapter extends EventTarget {
 
 	/** History of agent events */
 	readonly history: readonly {
-		type: 'step' | 'observation' | 'user_takeover'
+		type: 'step' | 'observation' | 'user_takeover' | 'error'
 		/** For 'step' type */
 		reflection?: {
 			evaluation_previous_goal?: string