Migrate Antigravity installer to native skills

test/test-installation-components.js

@@ -275,9 +275,56 @@ async function runTests() {
   console.log('');
 
   // ============================================================
-  // Test 6: QA Agent Compilation
+  // Test 6: Antigravity Native Skills Install
   // ============================================================
-  console.log(`${colors.yellow}Test Suite 6: QA Agent Compilation${colors.reset}\n`);
+  console.log(`${colors.yellow}Test Suite 6: Antigravity Native Skills${colors.reset}\n`);
+
+  try {
+    clearCache();
+    const platformCodes = await loadPlatformCodes();
+    const antigravityInstaller = platformCodes.platforms.antigravity?.installer;
+
+    assert(antigravityInstaller?.target_dir === '.agent/skills', 'Antigravity target_dir uses native skills path');
+
+    assert(antigravityInstaller?.skill_format === true, 'Antigravity installer enables native skill output');
+
+    assert(
+      Array.isArray(antigravityInstaller?.legacy_targets) && antigravityInstaller.legacy_targets.includes('.agent/workflows'),
+      'Antigravity installer cleans legacy workflow output',
+    );
+
+    const tempProjectDir = await fs.mkdtemp(path.join(os.tmpdir(), 'bmad-antigravity-test-'));
+    const installedBmadDir = await findInstalledBmadDir(projectRoot);
+    const legacyDir = path.join(tempProjectDir, '.agent', 'workflows', 'bmad-legacy-dir');
+    await fs.ensureDir(legacyDir);
+    await fs.writeFile(path.join(tempProjectDir, '.agent', 'workflows', 'bmad-legacy.md'), 'legacy\n');
+    await fs.writeFile(path.join(legacyDir, 'SKILL.md'), 'legacy\n');
+
+    const ideManager = new IdeManager();
+    await ideManager.ensureInitialized();
+    const result = await ideManager.setup('antigravity', tempProjectDir, installedBmadDir, {
+      silent: true,
+      selectedModules: ['bmm'],
+    });
+
+    assert(result.success === true, 'Antigravity setup succeeds against temp project');
+
+    const skillFile = path.join(tempProjectDir, '.agent', 'skills', 'bmad-master', 'SKILL.md');
+    assert(await fs.pathExists(skillFile), 'Antigravity install writes SKILL.md directory output');
+
+    assert(!(await fs.pathExists(path.join(tempProjectDir, '.agent', 'workflows'))), 'Antigravity setup removes legacy workflows dir');
+
+    await fs.remove(tempProjectDir);
+  } catch (error) {
+    assert(false, 'Antigravity native skills migration test succeeds', error.message);
+  }
+
+  console.log('');
+
+  // ============================================================
+  // Test 7: QA Agent Compilation
+  // ============================================================
+  console.log(`${colors.yellow}Test Suite 7: QA Agent Compilation${colors.reset}\n`);
 
   try {
     const builder = new YamlXmlBuilder();

tools/cli/installers/lib/ide/platform-codes.yaml

@@ -20,8 +20,11 @@ platforms:
     category: ide
     description: "Google's AI development environment"
     installer:
-      target_dir: .agent/workflows
+      legacy_targets:
+        - .agent/workflows
+      target_dir: .agent/skills
       template_type: antigravity
+      skill_format: true
 
   auggie:
     name: "Auggie"

tools/docs/native-skills-migration-checklist.md

@@ -46,7 +46,7 @@ Support assumption: full Agent Skills support. BMAD currently installs legacy co
 - [x] Test reinstall/upgrade from legacy command output
 - [x] Confirm no ancestor conflict protection is needed because a child workspace surfaced child `.cursor/skills` entries but not a parent-only skill during manual verification
 - [ ] Implement/extend automated tests
-- [ ] Commit
+- [x] Commit
 
 ## Windsurf
 
@@ -76,15 +76,15 @@ Support assumption: full Agent Skills support. BMAD currently installs workflow
 
 ## Google Antigravity
 
-Support assumption: full Agent Skills support. BMAD currently installs workflows to `.agent/workflows`; target should move to `.agent/skills`.
+Support assumption: full Agent Skills support. Antigravity docs confirm workspace skills at `.agent/skills/<skill-folder>/` and global skills at `~/.gemini/antigravity/skills/<skill-folder>/`. BMAD has now migrated from `.agent/workflows` to `.agent/skills`.
 
-- [ ] Confirm Antigravity native skills path and project/global precedence
+- [x] Confirm Antigravity native skills path and project/global precedence
-- [ ] Implement installer migration to native skills output
+- [x] Implement installer migration to native skills output
-- [ ] Add legacy cleanup for `.agent/workflows`
+- [x] Add legacy cleanup for `.agent/workflows`
-- [ ] Test fresh install
+- [x] Test fresh install
-- [ ] Test reinstall/upgrade from legacy workflow output
+- [x] Test reinstall/upgrade from legacy workflow output
-- [ ] Confirm ancestor conflict protection where applicable
+- [ ] Confirm ancestor conflict protection where applicable because Antigravity docs do not state whether parent-directory `.agent/skills` are inherited; `/tmp/antigravity-ancestor-repro` should be used for manual app verification instead of guessing
-- [ ] Implement/extend automated tests
+- [x] Implement/extend automated tests
 - [ ] Commit
 
 ## Auggie