diff --git a/lib/hooks/websearch-transformer.cjs b/lib/hooks/websearch-transformer.cjs
index b0270543..7a2af2a6 100644
--- a/lib/hooks/websearch-transformer.cjs
+++ b/lib/hooks/websearch-transformer.cjs
@@ -154,7 +154,10 @@ process.stdin.on('error', () => {
  */
 function isCliAvailable(cmd) {
   try {
-    const result = spawnSync('which', [cmd], {
+    const isWindows = process.platform === 'win32';
+    const whichCmd = isWindows ? 'where.exe' : 'which';
+
+    const result = spawnSync(whichCmd, [cmd], {
       encoding: 'utf8',
       timeout: 2000,
       stdio: ['pipe', 'pipe', 'pipe'],