diff --git a/src/main/antigravity/hook-service.test.ts b/src/main/antigravity/hook-service.test.ts
index b9f69b03cc1..6adcdc2448f 100644
--- a/src/main/antigravity/hook-service.test.ts
+++ b/src/main/antigravity/hook-service.test.ts
@@ -57,6 +57,49 @@ describe('AntigravityHookService', () => {
     rmSync(homeDir, { recursive: true, force: true })
   })
 
+  it.each(['darwin', 'win32'] as const)(
+    'reports and repairs a missing core script on %s',
+    (platform) => {
+      withPlatform(platform, () => {
+        const service = new AntigravityHookService()
+        expect(service.install().state).toBe('installed')
+        const filename = platform === 'win32' ? 'antigravity-hook.cmd' : 'antigravity-hook.sh'
+        rmSync(join(homeDir, '.orca', 'agent-hooks', filename))
+        expect(service.getStatus()).toMatchObject({ state: 'partial', managedHooksPresent: true })
+        expect(service.getStatus().detail).toContain(filename)
+        expect(service.install().state).toBe('installed')
+      })
+    }
+  )
+
+  it('reports and repairs a missing Windows event wrapper', () => {
+    withPlatform('win32', () => {
+      const service = new AntigravityHookService()
+      service.install()
+      rmSync(join(homeDir, '.orca', 'agent-hooks', 'antigravity-pre-tool-use.cmd'))
+      expect(service.getStatus()).toMatchObject({ state: 'partial', managedHooksPresent: true })
+      expect(service.getStatus().detail).toContain('antigravity-pre-tool-use.cmd')
+      expect(service.install().state).toBe('installed')
+    })
+  })
+
+  it('reinstalls a wiped bundle and missing scripts while preserving user hooks', () => {
+    withPlatform('win32', () => {
+      const service = new AntigravityHookService()
+      service.install()
+      const configPath = join(homeDir, '.gemini', 'config', 'hooks.json')
+      const userHooks = { 'user-hook': { Stop: [{ type: 'command', command: 'user-hook' }] } }
+      writeFileSync(configPath, JSON.stringify(userHooks))
+      rmSync(join(homeDir, '.orca', 'agent-hooks', 'antigravity-pre-tool-use.cmd'))
+      expect(service.getStatus().state).toBe('not_installed')
+      expect(service.install().state).toBe('installed')
+      expect(JSON.parse(readFileSync(configPath, 'utf8'))).toMatchObject(userHooks)
+      expect(
+        readFileSync(join(homeDir, '.orca', 'agent-hooks', 'antigravity-pre-tool-use.cmd'), 'utf8')
+      ).toContain('ORCA_ANTIGRAVITY_EVENT=PreToolUse')
+    })
+  })
+
   it('installs Antigravity global hooks.json bundle and managed script', () => {
     const status = new AntigravityHookService().install()
 
diff --git a/src/main/antigravity/hook-service.ts b/src/main/antigravity/hook-service.ts
index 0689be932ef..e49a522257a 100644
--- a/src/main/antigravity/hook-service.ts
+++ b/src/main/antigravity/hook-service.ts
@@ -1,3 +1,4 @@
+import { statSync } from 'node:fs'
 import { homedir } from 'node:os'
 import { join } from 'node:path'
 import type { SFTPWrapper } from 'ssh2'
@@ -32,6 +33,14 @@ import {
   removeInstalledConfig
 } from './hooks-json-bundle'
 
+function isManagedScriptFile(scriptPath: string): boolean {
+  try {
+    return statSync(scriptPath).isFile()
+  } catch {
+    return false
+  }
+}
+
 function getConfigPath(): string {
   // Why: Antigravity's hook docs define global hooks in ~/.gemini/config/hooks.json,
   // not in the CLI settings file used by Gemini CLI.
@@ -132,6 +141,23 @@ export class AntigravityHookService {
           ? `Managed hook missing for events: ${missing.join(', ')}`
           : 'Stale managed hook entries need cleanup'
     }
+    if (managedHooksPresent) {
+      const scriptNames = [
+        getManagedScriptFileName(),
+        ...(process.platform === 'win32'
+          ? ANTIGRAVITY_EVENTS.map((event) => event.windowsWrapperFileName)
+          : [])
+      ]
+      const unavailable = scriptNames.filter(
+        (name) => !isManagedScriptFile(getSharedManagedScriptPath(name))
+      )
+      if (unavailable.length > 0) {
+        state = 'partial'
+        detail = [detail, `Managed scripts unavailable: ${unavailable.join(', ')}`]
+          .filter(Boolean)
+          .join('; ')
+      }
+    }
     return { agent: 'antigravity', state, configPath, managedHooksPresent, detail }
   }