diff --git a/integration-tests/sdk-typescript/test-helper.ts b/integration-tests/sdk-typescript/test-helper.ts
index 8274398cb00..e2a9c398356 100644
--- a/integration-tests/sdk-typescript/test-helper.ts
+++ b/integration-tests/sdk-typescript/test-helper.ts
@@ -830,6 +830,30 @@ export function assertToolCalled(
   }
 }
 
+/**
+ * Assert that a specific tool was called and all its results succeeded
+ */
+export function assertToolSucceeded(
+  messages: SDKMessage[],
+  toolName: string,
+): void {
+  const results = findToolResults(messages, toolName);
+
+  if (results.length === 0) {
+    throw new Error(
+      `Expected tool '${toolName}' to have at least one result, but found none`,
+    );
+  }
+
+  for (const result of results) {
+    if (result.isError) {
+      throw new Error(
+        `Expected tool '${toolName}' to succeed, but got error: ${result.content}`,
+      );
+    }
+  }
+}
+
 /**
  * Assert that the conversation completed successfully
  */
diff --git a/integration-tests/sdk-typescript/tool-control.test.ts b/integration-tests/sdk-typescript/tool-control.test.ts
index 5fe5e474712..abc8466266b 100644
--- a/integration-tests/sdk-typescript/tool-control.test.ts
+++ b/integration-tests/sdk-typescript/tool-control.test.ts
@@ -26,12 +26,13 @@ import {
   findToolCalls,
   findToolResults,
   assertSuccessfulCompletion,
+  assertToolSucceeded,
   createSharedTestOptions,
   createResultWaiter,
 } from './test-helper.js';
 
 const SHARED_TEST_OPTIONS = createSharedTestOptions();
-const TEST_TIMEOUT = 60000;
+const TEST_TIMEOUT = process.env['CI'] ? 120_000 : 60_000;
 const SANDBOX_MODE = process.env['QWEN_SANDBOX']?.toLowerCase().trim();
 const IS_CONTAINER_SANDBOX =
   SANDBOX_MODE === 'docker' || SANDBOX_MODE === 'podman';
@@ -89,10 +90,9 @@ describe('Tool Control Parameters (E2E)', () => {
           // Should NOT have list_directory since it's not in coreTools
           expect(toolNames).not.toContain('list_directory');
 
-          // Verify file was actually modified (content changed from original).
-          // Don't assert on specific wording — the model may paraphrase.
-          const content = await helper.readFile('test.txt');
-          expect(content).not.toBe('original content');
+          // Verify write_file executed successfully (tool-control check,
+          // not model-content check — the model may echo back the original).
+          assertToolSucceeded(messages, 'write_file');
         } finally {
           await q.close();
         }
@@ -584,10 +584,9 @@ describe('Tool Control Parameters (E2E)', () => {
           // canUseTool should NOT have been called (tools are in allowedTools)
           expect(canUseToolCalled).toBe(false);
 
-          // Verify file was actually modified (content changed from original).
-          // Don't assert on specific wording — the model may paraphrase.
-          const content = await helper.readFile('test.txt');
-          expect(content).not.toBe('original');
+          // Verify write_file executed successfully (tool-control check,
+          // not model-content check — the model may echo back the original).
+          assertToolSucceeded(messages, 'write_file');
         } finally {
           await q.close();
         }
@@ -881,10 +880,9 @@ describe('Tool Control Parameters (E2E)', () => {
           // Should NOT use tools outside coreTools
           expect(toolNames).not.toContain('run_shell_command');
 
-          // Verify file was actually modified (content changed from original).
-          // Don't assert on specific wording — the model may paraphrase.
-          const content = await helper.readFile('test.txt');
-          expect(content).not.toBe('test');
+          // Verify write_file executed successfully (tool-control check,
+          // not model-content check — the model may echo back the original).
+          assertToolSucceeded(messages, 'write_file');
         } finally {
           await q.close();
         }
@@ -984,10 +982,9 @@ describe('Tool Control Parameters (E2E)', () => {
           // canUseTool should be called for core write tools
           expect(canUseToolCalls).toContain('write_file');
 
-          // Verify file was actually modified (content changed from original).
-          // Don't assert on specific wording — the model may paraphrase.
-          const content = await helper.readFile('test.txt');
-          expect(content).not.toBe('test');
+          // Verify write_file executed successfully (tool-control check,
+          // not model-content check — the model may echo back the original).
+          assertToolSucceeded(messages, 'write_file');
         } finally {
           await q.close();
         }