fix(skills): discover the Antigravity CLI global skill root (#21647)

src/main/skills/antigravity-skill-discovery.test.ts

@@ -0,0 +1,43 @@
+import { mkdtemp, mkdir, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join, posix, win32 } from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { buildSkillDiscoverySources, discoverSkills } from './discovery'
+
+describe('Antigravity CLI skill discovery', () => {
+  it.each([
+    { homeDir: '/home/agent', cwd: '/workspace', pathApi: posix },
+    { homeDir: 'C:\\Users\\agent', cwd: 'D:\\workspace', pathApi: win32 }
+  ])('uses the owning host path syntax for $homeDir', (args) => {
+    expect(
+      buildSkillDiscoverySources(args).find((root) => root.id === 'home-antigravity')
+    ).toMatchObject({
+      path: args.pathApi.join(args.homeDir, '.gemini', 'config', 'skills'),
+      owner: 'antigravity',
+      providers: ['agent-skills']
+    })
+  })
+
+  it('discovers the documented CLI root without claiming legacy-only skills are loaded', async () => {
+    const home = await mkdtemp(join(tmpdir(), 'orca-agy-skills-'))
+    try {
+      for (const [directory, name] of [
+        ['config', 'current-probe'],
+        ['antigravity', 'legacy-probe']
+      ]) {
+        const skill = join(home, '.gemini', directory, 'skills', name)
+        await mkdir(skill, { recursive: true })
+        await writeFile(
+          join(skill, 'SKILL.md'),
+          `---\nname: ${name}\ndescription: Discovery test\n---\nTest skill.\n`
+        )
+      }
+      const result = await discoverSkills({ homeDir: home, cwd: home, includeCwd: false })
+      const agySkills = result.skills.filter((skill) => skill.sourceLabel === 'Antigravity home')
+      expect(agySkills.map((skill) => skill.name)).toEqual(['current-probe'])
+      expect(agySkills[0]?.rootPath).toBe(join(home, '.gemini', 'config', 'skills'))
+    } finally {
+      await rm(home, { recursive: true, force: true })
+    }
+  })
+})

src/main/skills/discovery.test.ts

@@ -399,7 +399,7 @@ describe('skill discovery', () => {
     expect(rootPaths).toContain('/workspace/current/.claude/skills')
   })
 
-  it('scans each provider home skill root that npx skills --global writes to', () => {
+  it('scans provider home and workspace skill roots', () => {
     const roots = buildSkillDiscoverySources({
       homeDir: '/home/test',
       cwd: '/workspace/current'
@@ -414,7 +414,7 @@ describe('skill discovery', () => {
         '/home/test/.omp/agent/skills',
         '/home/test/.hermes/skills',
         '/home/test/.gemini/skills',
-        '/home/test/.gemini/antigravity/skills',
+        '/home/test/.gemini/config/skills',
         '/home/test/.cursor/skills',
         '/home/test/.factory/skills',
         '/home/test/.continue/skills',

src/main/skills/skill-discovery-sources.ts

@@ -188,7 +188,7 @@ export function buildSkillDiscoverySources(
     source(
       'home-antigravity',
       'Antigravity home',
-      pathApi.join(home, '.gemini', 'antigravity', 'skills'),
+      pathApi.join(home, '.gemini', 'config', 'skills'),
       'home',
       ['agent-skills'],
       'antigravity'