diff --git a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
index 07015a02403..5aa2f3cb92b 100644
--- a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
+++ b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
@@ -1105,7 +1105,7 @@ describe("sanitizeSessionHistory", () => {
 
     const toolResult = validated[2] as Extract<AgentMessage, { role: "toolResult" }>;
     expect(toolResult.toolCallId).toBe("toolu_legacy");
-    expect(toolResult.isError).toBe(false);
+    expect(toolResult.isError).toBe(true);
   });
 
   it("strips copied inbound metadata from assistant replay text", async () => {