diff --git a/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-allow-agent-specific-docker-settings-beyond.test.ts b/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-allow-agent-specific-docker-settings-beyond.test.ts
index 8f9894395..07162948d 100644
--- a/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-allow-agent-specific-docker-settings-beyond.test.ts
+++ b/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-allow-agent-specific-docker-settings-beyond.test.ts
@@ -49,10 +49,9 @@ vi.mock("../skills.js", async (importOriginal) => {
   const actual = await importOriginal<typeof import("../skills.js")>();
   return {
     ...actual,
-    syncSkillsToWorkspace: vi.fn(async () => {}),
+    syncSkillsToWorkspace: vi.fn(async () => undefined),
   };
 });
-
 describe("Agent-specific sandbox config", () => {
   beforeEach(() => {
     spawnCalls.length = 0;
diff --git a/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-use-agent-specific-workspaceroot.test.ts b/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-use-agent-specific-workspaceroot.test.ts
index 2babad8bf..373900d4f 100644
--- a/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-use-agent-specific-workspaceroot.test.ts
+++ b/src/agents/sandbox-agent-config.agent-specific-sandbox-config.should-use-agent-specific-workspaceroot.test.ts
@@ -50,10 +50,9 @@ vi.mock("../skills.js", async (importOriginal) => {
   const actual = await importOriginal<typeof import("../skills.js")>();
   return {
     ...actual,
-    syncSkillsToWorkspace: vi.fn(async () => {}),
+    syncSkillsToWorkspace: vi.fn(async () => undefined),
   };
 });
-
 describe("Agent-specific sandbox config", () => {
   beforeEach(() => {
     spawnCalls.length = 0;