diff --git a/extensions/duckduckgo/src/ddg-search-provider.test.ts b/extensions/duckduckgo/src/ddg-search-provider.test.ts
index 597fa401bbe2..6c6836fb7ed6 100644
--- a/extensions/duckduckgo/src/ddg-search-provider.test.ts
+++ b/extensions/duckduckgo/src/ddg-search-provider.test.ts
@@ -47,7 +47,6 @@ describe("duckduckgo web search provider", () => {
     expect(provider.requiresCredential).toBe(false);
     expect(provider.credentialPath).toBe("");
     const pluginEntry = applied.plugins?.entries?.duckduckgo;
-    expect(pluginEntry).toBeDefined();
     if (!pluginEntry) {
       throw new Error("expected DuckDuckGo plugin entry");
     }
diff --git a/extensions/inworld/tts.test.ts b/extensions/inworld/tts.test.ts
index f901d19a489a..33f57b6ac992 100644
--- a/extensions/inworld/tts.test.ts
+++ b/extensions/inworld/tts.test.ts
@@ -266,7 +266,6 @@ describe("inworldTTS", () => {
     expect(request.url).toBe("https://api.inworld.ai/tts/v1/voice:stream");
     expect(request.auditContext).toBe("inworld-tts");
     expect(request.policy).toEqual({ hostnameAllowlist: ["api.inworld.ai"] });
-    expect(request.init).toBeDefined();
     if (!request.init) {
       throw new Error("expected Inworld TTS request init");
     }
diff --git a/extensions/microsoft-foundry/index.test.ts b/extensions/microsoft-foundry/index.test.ts
index fe4c906cef62..66ea188bbfdb 100644
--- a/extensions/microsoft-foundry/index.test.ts
+++ b/extensions/microsoft-foundry/index.test.ts
@@ -54,7 +54,6 @@ function registerProvider() {
   );
   expect(registerProviderMock).toHaveBeenCalledTimes(1);
   const firstCall = registerProviderMock.mock.calls[0];
-  expect(firstCall).toBeDefined();
   if (!firstCall) {
     throw new Error("expected Microsoft Foundry provider registration");
   }
@@ -75,7 +74,6 @@ function requirePrepareRuntimeAuth(
 }
 
 function requireRuntimeAuthResult(result: { apiKey?: string; baseUrl?: string } | undefined) {
-  expect(result).toBeDefined();
   if (!result) {
     throw new Error("expected Microsoft Foundry runtime auth result");
   }
diff --git a/extensions/moonshot/provider-catalog.test.ts b/extensions/moonshot/provider-catalog.test.ts
index d1e69ae2c89d..4644acf91ad4 100644
--- a/extensions/moonshot/provider-catalog.test.ts
+++ b/extensions/moonshot/provider-catalog.test.ts
@@ -26,7 +26,6 @@ function requireFirstMoonshotModel(provider: MoonshotProvider): MoonshotModel {
 }
 
 function requireMoonshotCompat(model: MoonshotModel): NonNullable<MoonshotModel["compat"]> {
-  expect(model.compat).toBeDefined();
   if (!model.compat) {
     throw new Error(`expected Moonshot model ${model.id} compat`);
   }
diff --git a/extensions/web-readability/web-content-extractor.test.ts b/extensions/web-readability/web-content-extractor.test.ts
index 62c0fa0693bf..3eabc9fd860c 100644
--- a/extensions/web-readability/web-content-extractor.test.ts
+++ b/extensions/web-readability/web-content-extractor.test.ts
@@ -30,7 +30,6 @@ type ReadabilityResult = Awaited<
 >;
 
 function requireReadabilityResult(result: ReadabilityResult): NonNullable<ReadabilityResult> {
-  expect(result).toBeDefined();
   if (!result) {
     throw new Error("expected readability extraction result");
   }