diff --git a/src/providers/agy.ts b/src/providers/agy.ts
index 550c9bd1..d5905753 100644
--- a/src/providers/agy.ts
+++ b/src/providers/agy.ts
@@ -33,7 +33,10 @@ export class AgyProvider implements ProviderAdapter {
   }
 
   installCommand(os: 'linux' | 'macos' | 'windows'): string {
-    return 'npm install -g @google/antigravity-cli';
+    if (os === 'windows') {
+      return 'powershell -Command "irm https://antigravity.google/cli/install.ps1 | iex"';
+    }
+    return 'curl -fsSL https://antigravity.google/cli/install.sh | bash';
   }
 
   updateCommand(): string {
diff --git a/tests/providers.test.ts b/tests/providers.test.ts
index 864dabc3..4882b864 100644
--- a/tests/providers.test.ts
+++ b/tests/providers.test.ts
@@ -883,7 +883,9 @@ describe('AgyProvider', () => {
   });
 
   it('builds installCommand', () => {
-    expect(p.installCommand('linux')).toBe('npm install -g @google/antigravity-cli');
+    expect(p.installCommand('linux')).toBe('curl -fsSL https://antigravity.google/cli/install.sh | bash');
+    expect(p.installCommand('macos')).toBe('curl -fsSL https://antigravity.google/cli/install.sh | bash');
+    expect(p.installCommand('windows')).toBe('powershell -Command "irm https://antigravity.google/cli/install.ps1 | iex"');
   });
 
   it('builds updateCommand', () => {