diff --git a/tests/integration/build_setup/build_setup_test.ts b/tests/integration/build_setup/build_setup_test.ts
index 880dee469..6028f707a 100644
--- a/tests/integration/build_setup/build_setup_test.ts
+++ b/tests/integration/build_setup/build_setup_test.ts
@@ -12,17 +12,10 @@ import {getResponse, sendInput} from '../test_case_utils.js';
 const execAsync = promisify(exec);
 const dirname = process.cwd();
 
+// Hooks do the install/build; each test only runs a short command inside the
+// installed fixture. Per-test budget, not an install budget.
 const TEST_EXECUTION_TIMEOUT = 20000;
 
-// These hooks run `npm install` (plus `npm run build` for ts_* setups) and the
-// recursive node_modules teardown, overrunning vitest's default 10s hookTimeout
-// and causing flaky "Hook timed out in 10000ms" failures. All twelve hook runs
-// take ~16s combined on ubuntu-latest, but a cold, network-bound install has
-// been measured at ~70s, so 120s covers the worst case. Don't raise
-// TEST_EXECUTION_TIMEOUT for hook flakes; that stays the 20s per-test budget.
-// Trade-off: a stuck hook now takes this long to surface.
-const HOOK_TIMEOUT = 120000;
-
 describe('Build setup', () => {
   describe.each([
     'js_commonjs',
@@ -52,7 +45,7 @@ describe('Build setup', () => {
         expect(buildResult.stderr).toBe('');
         expect(buildResult.stdout).toContain('\nBuild complete');
       }
-    }, HOOK_TIMEOUT);
+    });
 
     it(
       'should build and run agent successfully',
@@ -128,6 +121,6 @@ describe('Build setup', () => {
           .rm(`${projectPath}/dist`, {recursive: true, force: true})
           .catch(() => {});
       }
-    }, HOOK_TIMEOUT);
+    });
   });
 });
diff --git a/tests/integration/tools/run_skill_script_tool_test.ts b/tests/integration/tools/run_skill_script_tool_test.ts
index aa7f0ef6d..c842bc111 100644
--- a/tests/integration/tools/run_skill_script_tool_test.ts
+++ b/tests/integration/tools/run_skill_script_tool_test.ts
@@ -21,10 +21,11 @@ import {describe, expect, it} from 'vitest';
 const IS_WINDOWS = os.platform() === 'win32';
 const IS_UNIX = os.platform() === 'linux' || os.platform() === 'darwin';
 
-// PowerShell/cmd cold-start on the windows-latest CI runner can exceed vitest's
-// 5000ms default. Must also exceed UnsafeLocalCodeExecutor's default
+// 40000 tightens the project's 60000 testTimeout, which a per-test argument
+// replaces rather than raises. It stays above UnsafeLocalCodeExecutor's default
 // timeoutSeconds (30) so the executor's own timeout error surfaces first; see
-// core/src/code_executors/unsafe_local_code_executor.ts
+// core/src/code_executors/unsafe_local_code_executor.ts. Only the four
+// it.skipIf(!IS_WINDOWS) tests pass it, where shell cold-start is slowest.
 const TEST_EXECUTION_TIMEOUT = 40000;
 
 describe('RunSkillScriptTool Integration with UnsafeLocalCodeExecutor', () => {
diff --git a/vitest.config.ts b/vitest.config.ts
index 1b7eaee63..ce7d5124c 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -8,9 +8,11 @@ import path from 'path';
 import {defineConfig} from 'vitest/config';
 
 /**
- * Hook budget (ms) for the `integration` project: install-heavy `beforeAll`
- * hooks run `npm install` (and sometimes `npm run build`) per fixture, which
- * exceeds Vitest's 10s default on a slow or loaded machine.
+ * Hook budget (ms) for the `integration` project. The `beforeAll` hooks run
+ * `npm install` (and sometimes `npm run build`) per fixture, and the `afterAll`
+ * hooks remove `node_modules` recursively, which exceeds Vitest's 10s default.
+ * A cold, network-bound install has been measured at ~70s, so 120s covers the
+ * worst case. Trade-off: a stuck hook takes this long to surface.
  */
 const INTEGRATION_HOOK_TIMEOUT_MS = 120000;