diff --git a/scripts/hooks/pre-bash-tmux-reminder.js b/scripts/hooks/pre-bash-tmux-reminder.js
index 2ad56ea3..e00c16df 100755
--- a/scripts/hooks/pre-bash-tmux-reminder.js
+++ b/scripts/hooks/pre-bash-tmux-reminder.js
@@ -13,7 +13,7 @@ function run(rawInput) {
     if (
       process.platform !== 'win32' &&
       !process.env.TMUX &&
-      /(npm (install|test)|pnpm (install|test)|yarn (install|test)?|bun (install|test)|cargo build|make\b|docker\b|pytest|vitest|playwright)/.test(cmd)
+      /(npm (install|test)|pnpm (install|test)|yarn (install|test)|bun (install|test)|cargo build|make\b|docker\b|pytest|vitest|playwright)/.test(cmd)
     ) {
       return {
         additionalContext: [
diff --git a/tests/hooks/pre-bash-tmux-reminder.test.js b/tests/hooks/pre-bash-tmux-reminder.test.js
new file mode 100644
index 00000000..a441f17e
--- /dev/null
+++ b/tests/hooks/pre-bash-tmux-reminder.test.js
@@ -0,0 +1,78 @@
+const assert = require('assert');
+const path = require('path');
+const { spawnSync } = require('child_process');
+
+const script = path.join(__dirname, '..', '..', 'scripts', 'hooks', 'pre-bash-tmux-reminder.js');
+
+function run(command, extraEnv = {}) {
+  const { TMUX: _tmux, ...envWithoutTmux } = process.env;
+  const result = spawnSync(process.execPath, [script], {
+    encoding: 'utf8',
+    input: JSON.stringify({ tool_input: { command } }),
+    timeout: 10000,
+    env: { ...envWithoutTmux, ...extraEnv }
+  });
+
+  if (result.error) throw result.error;
+  if (result.signal) throw new Error(`hook terminated by ${result.signal}`);
+
+  assert.strictEqual(result.status, 0, `unexpected exit for ${command}: ${result.stderr || ''}`);
+  return result.stdout || '';
+}
+
+function hasReminder(command, extraEnv) {
+  return run(command, extraEnv).includes('Consider running in tmux');
+}
+
+function runTests() {
+  console.log('\n=== Testing pre-bash-tmux-reminder.js ===\n');
+
+  if (process.platform === 'win32') {
+    console.log('  SKIP: hook is a no-op on win32');
+    return true;
+  }
+
+  const cases = [
+    ['fires for yarn install and yarn test', () => {
+      assert.ok(hasReminder('yarn install'));
+      assert.ok(hasReminder('yarn test'));
+    }],
+    ['does not fire for ordinary yarn commands', () => {
+      assert.ok(!hasReminder('yarn add react'));
+      assert.ok(!hasReminder('yarn build'));
+      assert.ok(!hasReminder('yarn dev'));
+      assert.ok(!hasReminder('yarn --version'));
+      assert.ok(!hasReminder('yarn'));
+    }],
+    ['keeps sibling package-manager behavior', () => {
+      assert.ok(hasReminder('npm install'));
+      assert.ok(hasReminder('pnpm test'));
+      assert.ok(hasReminder('bun install'));
+      assert.ok(!hasReminder('npm run dev'));
+    }],
+    ['suppresses reminders inside tmux', () => {
+      assert.ok(!hasReminder('yarn install', { TMUX: '/tmp/tmux-1000/default,1,0' }));
+    }]
+  ];
+
+  let failed = 0;
+  for (const [name, fn] of cases) {
+    try {
+      fn();
+      console.log(`  PASS ${name}`);
+    } catch (error) {
+      failed++;
+      console.log(`  FAIL ${name}`);
+      console.log(`       ${error.message}`);
+    }
+  }
+
+  console.log(`\nResults: ${cases.length - failed} passed, ${failed} failed\n`);
+  return failed === 0;
+}
+
+if (require.main === module) {
+  process.exit(runTests() ? 0 : 1);
+}
+
+module.exports = { runTests };