diff --git a/src/agents/cli-runner/types.ts b/src/agents/cli-runner/types.ts
index 7c0a90c6d903..68ab84678ef5 100644
--- a/src/agents/cli-runner/types.ts
+++ b/src/agents/cli-runner/types.ts
@@ -71,6 +71,8 @@ export type RunCliAgentParams = {
   fastModeAutoOnSeconds?: number;
   /** Shared notification state for nested harnesses that can observe the same tool boundary. */
   fastModeAutoProgressState?: FastModeAutoProgressState;
+  /** True when the outer model fallback loop has reached its final candidate. */
+  isFinalFallbackAttempt?: boolean;
   timeoutMs: number;
   /**
    * Explicit run timeout, in milliseconds, when the caller can distinguish a