diff --git a/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.resource-loader.test.ts b/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.resource-loader.test.ts
index 496cd82ea53..ba9c731bc99 100644
--- a/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.resource-loader.test.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.resource-loader.test.ts
@@ -24,10 +24,11 @@ describe("runEmbeddedAttempt resource loader wiring", () => {
     });
 
     expect(createAgentSession).toHaveBeenCalledOnce();
-    expect(createAgentSession).toHaveBeenCalledWith(
-      expect.objectContaining({
-        resourceLoader,
-      }),
-    );
+    const calls = createAgentSession.mock.calls as unknown as Array<[{ resourceLoader?: unknown }]>;
+    const options = calls[0]?.[0];
+    if (!options) {
+      throw new Error("Expected createAgentSession options");
+    }
+    expect(options.resourceLoader).toBe(resourceLoader);
   });
 });