diff --git a/hooks/hooks.json b/hooks/hooks.json
index d64af23..f0d79af 100644
--- a/hooks/hooks.json
+++ b/hooks/hooks.json
@@ -47,7 +47,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/suggest-compact.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/suggest-compact.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" suggest-compact"
 					}
 				],
 				"description": "Suggest manual compaction at logical intervals"
@@ -59,7 +59,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/pre-compact.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/pre-compact.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" pre-compact"
 					}
 				],
 				"description": "Run pre-compression logic"
@@ -71,7 +71,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/session-start.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/session-start.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" session-start"
 					}
 				],
 				"description": "Load previous context and detect package manager on new session"
@@ -137,7 +137,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/check-console-log.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/check-console-log.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" check-console-log"
 					}
 				],
 				"description": "Check for console.log in modified files after each response"
@@ -149,7 +149,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/session-end.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/session-end.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" session-end"
 					}
 				],
 				"description": "Persist session state on end"
@@ -159,7 +159,7 @@
 				"hooks": [
 					{
 						"type": "command",
-						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/evaluate-session.js\" 2>/dev/null || node \"$HOME/.gemini/scripts/hooks/evaluate-session.js\" 2>/dev/null || true"
+						"command": "node \"$HOME/.gemini/extensions/everything-gemini-code/scripts/hooks/run.js\" evaluate-session"
 					}
 				],
 				"description": "Evaluate session for extractable patterns"
diff --git a/scripts/hooks/run.js b/scripts/hooks/run.js
new file mode 100755
index 0000000..52885c2
--- /dev/null
+++ b/scripts/hooks/run.js
@@ -0,0 +1,53 @@
+#!/usr/bin/env node
+/**
+ * Cross-platform hook launcher.
+ *
+ * Invoked from hooks.json as:
+ *   node "<extension-root>/scripts/hooks/run.js" <hook-name>
+ *
+ * Resolves the target hook file relative to this launcher (__dirname) so the
+ * same hooks.json works regardless of whether the extension was installed to
+ * ~/.gemini/extensions/... or copied under ~/.gemini/ directly. Avoids
+ * POSIX-only shell constructs (`||`, `2>/dev/null`, `true`) that break on
+ * Windows PowerShell 5.x. See issue #42.
+ */
+
+'use strict';
+
+const path = require('node:path');
+const fs = require('node:fs');
+const { spawnSync } = require('node:child_process');
+
+const hookName = process.argv[2];
+if (!hookName || !/^[a-z][a-z0-9-]*$/i.test(hookName)) {
+  // No hook name, or a suspicious value — exit silently.
+  process.exit(0);
+}
+
+const hookPath = path.join(__dirname, `${hookName}.js`);
+if (!fs.existsSync(hookPath)) {
+  // Optional hook not installed — stay quiet, matches the prior `|| true` behavior.
+  process.exit(0);
+}
+
+// Run the hook in its own Node process so it inherits stdin/stdout/stderr
+// unchanged (hooks read JSON payloads on stdin and may write to stdout/stderr).
+// Mirror the previous "fail soft" semantics: a hook error never fails the
+// parent Gemini CLI action. Surface via GEMINI_HOOK_DEBUG=1 when diagnosing.
+// Bound execution time so a hung hook can't stall a Gemini session. Override
+// via GEMINI_HOOK_TIMEOUT_MS (e.g. set to a larger value for slow hooks, or
+// to 0 to disable the bound).
+const DEFAULT_HOOK_TIMEOUT_MS = 30_000;
+const parsedTimeout = Number.parseInt(process.env.GEMINI_HOOK_TIMEOUT_MS || '', 10);
+const timeout = Number.isFinite(parsedTimeout) && parsedTimeout >= 0
+  ? parsedTimeout
+  : DEFAULT_HOOK_TIMEOUT_MS;
+
+const spawnOptions = { stdio: 'inherit' };
+if (timeout > 0) spawnOptions.timeout = timeout;
+
+const result = spawnSync(process.execPath, [hookPath], spawnOptions);
+if (result.error && process.env.GEMINI_HOOK_DEBUG) {
+  console.error(`[hook:${hookName}] spawn error:`, result.error);
+}
+process.exit(0);
diff --git a/tests/hooks/hooks.test.js b/tests/hooks/hooks.test.js
index 0a4b0eb..fae7f4e 100644
--- a/tests/hooks/hooks.test.js
+++ b/tests/hooks/hooks.test.js
@@ -351,6 +351,65 @@ async function runTests() {
     }
   })) passed++; else failed++;
 
+  if (test('hook script commands avoid POSIX-only shell syntax (Windows PS compat)', () => {
+    // Regression guard for #42. Hook commands that invoke a script file must
+    // not chain with `||`, redirect with `2>/dev/null`, or rely on `true` —
+    // Windows PowerShell 5.x parses `||` as an error and has no /dev/null.
+    // Inline `node -e "..."` payloads are exempt because the JS string is
+    // consumed by Node, not the shell.
+    const hooksPath = path.join(__dirname, '..', '..', 'hooks', 'hooks.json');
+    const hooks = JSON.parse(fs.readFileSync(hooksPath, 'utf8'));
+    const hooksObj = hooks.hooks || hooks;
+
+    const checkHooks = (hookArray) => {
+      if (!hookArray) return;
+      for (const entry of hookArray) {
+        for (const hook of entry.hooks) {
+          if (hook.type !== 'command') continue;
+          if (hook.command.startsWith('node -e ')) continue;
+          // Regex guards catch variants like `||true`, `cmd|| true`, `2> /dev/null`.
+          const bad = [
+            { pattern: /\|\|/, label: '||' },
+            { pattern: /2>\s*\/dev\/null\b/, label: '2>/dev/null' },
+            { pattern: /(^|\s)true(\s|$)/, label: 'trailing `true`' },
+          ];
+          for (const { pattern, label } of bad) {
+            assert.ok(
+              !pattern.test(hook.command),
+              `Hook command must not use POSIX-only "${label}" (breaks on Windows PowerShell): ${hook.command.substring(0, 80)}...`
+            );
+          }
+        }
+      }
+    };
+
+    if (Array.isArray(hooksObj)) {
+        checkHooks(hooksObj);
+    } else {
+        for (const [, hookArray] of Object.entries(hooksObj)) {
+            checkHooks(hookArray);
+        }
+    }
+  })) passed++; else failed++;
+
+  if (test('run.js launcher resolves hook files from its own directory', () => {
+    const launcher = path.join(__dirname, '..', '..', 'scripts', 'hooks', 'run.js');
+    assert.ok(fs.existsSync(launcher), 'scripts/hooks/run.js must exist');
+    const src = fs.readFileSync(launcher, 'utf8');
+    // Strip block + line comments so header doc can't satisfy the assertions.
+    const code = src
+      .replace(/\/\*[\s\S]*?\*\//g, '')
+      .replace(/^\s*\/\/.*$/gm, '');
+    assert.ok(
+      /path\.join\(\s*__dirname/.test(code),
+      'launcher should resolve hooks via path.join(__dirname, ...)'
+    );
+    assert.ok(
+      /process\.argv\[2\]/.test(code),
+      'launcher should read hook name from process.argv[2]'
+    );
+  })) passed++; else failed++;
+
   // plugin.json validation
   console.log('\nplugin.json Validation:');