diff --git a/src/agents/cli-auth-epoch.test.ts b/src/agents/cli-auth-epoch.test.ts
index 0c41fd636a7e..18bf8e6c0d4e 100644
--- a/src/agents/cli-auth-epoch.test.ts
+++ b/src/agents/cli-auth-epoch.test.ts
@@ -16,7 +16,7 @@ describe("resolveCliAuthEpoch", () => {
     label = "auth epoch",
   ): asserts epoch is string {
     expect(typeof epoch, label).toBe("string");
-    expect(epoch?.trim().length, label).toBeGreaterThan(0);
+    expect(epoch, label).toMatch(/^[a-f0-9]{64}$/);
   }
 
   it("returns undefined when no local or auth-profile credentials exist", async () => {