diff --git a/src/media-understanding/media-understanding-url-fallback.test.ts b/src/media-understanding/media-understanding-url-fallback.test.ts
index 62cbc662bf8..4f8e93b89b8 100644
--- a/src/media-understanding/media-understanding-url-fallback.test.ts
+++ b/src/media-understanding/media-understanding-url-fallback.test.ts
@@ -15,6 +15,23 @@ vi.mock("../media/fetch.js", async () => {
   };
 });
 
+function requireFetchRemoteMediaInput(): {
+  url?: unknown;
+  fetchImpl?: unknown;
+  maxBytes?: unknown;
+  ssrfPolicy?: unknown;
+} {
+  const [call] = fetchRemoteMediaMock.mock.calls;
+  if (!call) {
+    throw new Error("expected fetchRemoteMedia call");
+  }
+  const [input] = call;
+  if (typeof input !== "object" || input === null || Array.isArray(input)) {
+    throw new Error("expected fetchRemoteMedia input to be an object");
+  }
+  return input;
+}
+
 async function withBlockedLocalAttachmentFallback(
   prefix: string,
   run: (params: { cache: MediaAttachmentCache; fallbackUrl: string }) => Promise<void>,
@@ -65,10 +82,8 @@ describe("media understanding attachment URL fallback", () => {
         expect(path.basename(result.path).startsWith("openclaw-media-")).toBe(true);
         expect(path.extname(result.path)).toBe(".jpg");
         expect(fetchRemoteMediaMock).toHaveBeenCalledTimes(1);
-        const fetchInput = fetchRemoteMediaMock.mock.calls[0]?.[0] as
-          | { url?: unknown; fetchImpl?: unknown; maxBytes?: unknown; ssrfPolicy?: unknown }
-          | undefined;
-        const fetchImpl = fetchInput?.fetchImpl;
+        const fetchInput = requireFetchRemoteMediaInput();
+        const fetchImpl = fetchInput.fetchImpl;
         expect(fetchInput).toStrictEqual({
           url: fallbackUrl,
           fetchImpl,
@@ -95,10 +110,8 @@ describe("media understanding attachment URL fallback", () => {
         });
         expect(result.buffer.toString()).toBe("fallback-buffer");
         expect(fetchRemoteMediaMock).toHaveBeenCalledTimes(1);
-        const fetchInput = fetchRemoteMediaMock.mock.calls[0]?.[0] as
-          | { url?: unknown; fetchImpl?: unknown; maxBytes?: unknown; ssrfPolicy?: unknown }
-          | undefined;
-        const fetchImpl = fetchInput?.fetchImpl;
+        const fetchInput = requireFetchRemoteMediaInput();
+        const fetchImpl = fetchInput.fetchImpl;
         expect(fetchInput).toStrictEqual({
           url: fallbackUrl,
           fetchImpl,
diff --git a/src/media-understanding/openai-compatible-audio.pin-dns.test.ts b/src/media-understanding/openai-compatible-audio.pin-dns.test.ts
index 6e726a567a6..e5507382677 100644
--- a/src/media-understanding/openai-compatible-audio.pin-dns.test.ts
+++ b/src/media-understanding/openai-compatible-audio.pin-dns.test.ts
@@ -12,6 +12,18 @@ vi.mock("./shared.js", async () => {
   };
 });
 
+function requirePostTranscriptionRequest(): { pinDns?: unknown; body?: unknown } {
+  const [call] = postTranscriptionRequestMock.mock.calls;
+  if (!call) {
+    throw new Error("expected postTranscriptionRequest call");
+  }
+  const [request] = call;
+  if (typeof request !== "object" || request === null || Array.isArray(request)) {
+    throw new Error("expected postTranscriptionRequest params to be an object");
+  }
+  return request;
+}
+
 import { transcribeOpenAiCompatibleAudio } from "./openai-compatible-audio.js";
 
 afterEach(() => {
@@ -37,10 +49,8 @@ describe("transcribeOpenAiCompatibleAudio pinDns", () => {
     });
 
     expect(result.text).toBe("ok");
-    const request = postTranscriptionRequestMock.mock.calls[0]?.[0] as
-      | { pinDns?: boolean; body?: unknown }
-      | undefined;
-    expect(request?.pinDns).toBe(false);
-    expect(request?.body).toBeInstanceOf(FormData);
+    const request = requirePostTranscriptionRequest();
+    expect(request.pinDns).toBe(false);
+    expect(request.body).toBeInstanceOf(FormData);
   });
 });
diff --git a/src/media-understanding/runtime.test.ts b/src/media-understanding/runtime.test.ts
index 521fd93263d..c7312b805fc 100644
--- a/src/media-understanding/runtime.test.ts
+++ b/src/media-understanding/runtime.test.ts
@@ -46,6 +46,14 @@ vi.mock("./image-runtime.js", () => ({
   describeImageWithModel: mocks.describeImageWithModel,
 }));
 
+function requireRunCapabilityRequest(): unknown {
+  const [call] = mocks.runCapability.mock.calls;
+  if (!call) {
+    throw new Error("expected runCapability call");
+  }
+  return call[0];
+}
+
 describe("media-understanding runtime", () => {
   afterEach(() => {
     mocks.buildProviderRegistry.mockReset();
@@ -200,7 +208,7 @@ describe("media-understanding runtime", () => {
     });
 
     expect(mocks.runCapability).toHaveBeenCalledOnce();
-    expect(mocks.runCapability.mock.calls[0]?.[0]).toEqual({
+    expect(requireRunCapabilityRequest()).toEqual({
       capability: "image",
       cfg: {
         tools: {