diff --git a/hosts/agy.ts b/hosts/agy.ts
new file mode 100644
index 000000000..d8c267576
--- /dev/null
+++ b/hosts/agy.ts
@@ -0,0 +1,48 @@
+import type { HostConfig } from '../scripts/host-config';
+
+const agy: HostConfig = {
+  name: 'agy',
+  displayName: 'Antigravity',
+  cliCommand: 'agy',
+  cliAliases: ['antigravity'],
+
+  globalRoot: '.gemini/config/skills/gstack',
+  localSkillRoot: '.agents/skills/gstack',
+  hostSubdir: '.agy',
+  usesEnvVars: true,
+
+  frontmatter: {
+    mode: 'allowlist',
+    keepFields: ['name', 'description'],
+    descriptionLimit: null,
+  },
+
+  generation: {
+    generateMetadata: false,
+    skipSkills: ['codex'],
+  },
+
+  pathRewrites: [
+    { from: '~/.claude/skills/gstack', to: '~/.gemini/config/skills/gstack' },
+    { from: '.claude/skills/gstack', to: '.agents/skills/gstack' },
+    { from: '.claude/skills', to: '.agents/skills' },
+  ],
+
+  suppressedResolvers: ['GBRAIN_CONTEXT_LOAD', 'GBRAIN_SAVE_RESULTS'],
+
+  runtimeRoot: {
+    globalSymlinks: ['bin', 'browse/dist', 'browse/bin', 'design/dist', 'gstack-upgrade', 'ETHOS.md', 'review/specialists', 'qa/templates', 'qa/references', 'plan-devex-review/dx-hall-of-fame.md'],
+    globalFiles: {
+      'review': ['checklist.md', 'design-checklist.md', 'greptile-triage.md', 'TODOS-format.md'],
+    },
+  },
+
+  install: {
+    prefixable: false,
+    linkingStrategy: 'symlink-generated',
+  },
+
+  learningsMode: 'basic',
+};
+
+export default agy;
diff --git a/hosts/index.ts b/hosts/index.ts
index cc1c213b5..4cd643ce4 100644
--- a/hosts/index.ts
+++ b/hosts/index.ts
@@ -16,9 +16,10 @@ import cursor from './cursor';
 import openclaw from './openclaw';
 import hermes from './hermes';
 import gbrain from './gbrain';
+import agy from './agy';
 
 /** All registered host configs. Add new hosts here. */
-export const ALL_HOST_CONFIGS: HostConfig[] = [claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain];
+export const ALL_HOST_CONFIGS: HostConfig[] = [claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain, agy];
 
 /** Map from host name to config. */
 export const HOST_CONFIG_MAP: Record<string, HostConfig> = Object.fromEntries(
@@ -65,4 +66,4 @@ export function getExternalHosts(): HostConfig[] {
 }
 
 // Re-export individual configs for direct import
-export { claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain };
+export { claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain, agy };