diff --git a/extensions/microsoft-foundry/index.ts b/extensions/microsoft-foundry/index.ts
index a6f14b7c04d..6acc3ec2f36 100644
--- a/extensions/microsoft-foundry/index.ts
+++ b/extensions/microsoft-foundry/index.ts
@@ -22,7 +22,8 @@ function execCmd(cmd: string): string {
 
 function isAzCliInstalled(): boolean {
   try {
-    execCmd("which az");
+    // "az version" works on Windows, Linux, and macOS
+    execCmd("az version --output none");
     return true;
   } catch {
     return false;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e381cdf6d34..fa47f57f1a8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -244,6 +244,8 @@ importers:
 
   extensions/anthropic: {}
 
+  extensions/azure-foundry: {}
+
   extensions/bluebubbles:
     dependencies:
       zod: