diff --git a/src/agents/bash-tools.exec-foreground-failures.test.ts b/src/agents/bash-tools.exec-foreground-failures.test.ts
index 4ca357b67de..34e6d91197e 100644
--- a/src/agents/bash-tools.exec-foreground-failures.test.ts
+++ b/src/agents/bash-tools.exec-foreground-failures.test.ts
@@ -48,7 +48,8 @@ describe("exec foreground failures", () => {
       exitCode: null,
       aggregated: "",
     });
-    expect((result.details as { durationMs?: number }).durationMs).toEqual(expect.any(Number));
+    expect((result.details as { durationMs?: number }).durationMs).toBeTypeOf("number");
+    expect((result.details as { durationMs?: number }).durationMs).toBeGreaterThanOrEqual(0);
   });
 
   it("rejects invalid host values before launching a command", async () => {
diff --git a/src/agents/bootstrap-budget.test.ts b/src/agents/bootstrap-budget.test.ts
index 2b6d246fe14..fc832dfc42a 100644
--- a/src/agents/bootstrap-budget.test.ts
+++ b/src/agents/bootstrap-budget.test.ts
@@ -211,7 +211,8 @@ describe("bootstrap prompt warnings", () => {
       mode: "once",
     });
     expect(first.warningShown).toBe(true);
-    expect(first.signature).toEqual(expect.any(String));
+    expect(first.signature).toBeTypeOf("string");
+    expect(first.signature).not.toBe("");
     expect(JSON.parse(first.signature ?? "{}")).toMatchObject({
       bootstrapMaxChars: 120,
       bootstrapTotalMaxChars: 200,
diff --git a/src/infra/push-apns.test.ts b/src/infra/push-apns.test.ts
index 12e90ff4bbe..95a3d02acb3 100644
--- a/src/infra/push-apns.test.ts
+++ b/src/infra/push-apns.test.ts
@@ -589,7 +589,8 @@ describe("push APNs send semantics", () => {
         },
       },
     });
-    expect(sent?.signature).toEqual(expect.any(String));
+    expect(sent?.signature).toBeTypeOf("string");
+    expect(sent?.signature).not.toBe("");
     expect(result).toMatchObject({
       ok: true,
       status: 202,