diff --git a/src/cli/handlers/orchestration-worker-agent-alias.test.ts b/src/cli/handlers/orchestration-worker-agent-alias.test.ts
new file mode 100644
index 00000000000..0846cf648a0
--- /dev/null
+++ b/src/cli/handlers/orchestration-worker-agent-alias.test.ts
@@ -0,0 +1,38 @@
+import { afterEach, expect, it, vi } from 'vitest'
+import { RuntimeClient } from '../runtime-client'
+import { ORCHESTRATION_WORKER_LAUNCH_HANDLER } from './orchestration/worker-launch-handler'
+
+vi.mock('../format', () => ({ printResult: vi.fn() }))
+
+afterEach(() => vi.restoreAllMocks())
+
+it.each([undefined, 'remote-host'])('sends the canonical Antigravity agent to %s', async (on) => {
+  const client = new RuntimeClient('test-profile', 60_000, null, null)
+  const call = vi.spyOn(client, 'call').mockResolvedValue({
+    id: 'request_1',
+    ok: true,
+    _meta: { runtimeId: 'runtime_1' },
+    result: { state: 'ready' }
+  })
+  const flags = new Map<string, string | boolean>([
+    ['agent', 'agy'],
+    ['task', 'task_1'],
+    ['worktree', 'id:folder:workspace_1'],
+    ['from', 'term_coord']
+  ])
+  if (on) {
+    flags.set('on', on)
+  }
+
+  await ORCHESTRATION_WORKER_LAUNCH_HANDLER['orchestration worker-start']({
+    flags,
+    client,
+    cwd: '.',
+    json: true
+  })
+
+  expect(call).toHaveBeenCalledWith(
+    'orchestration.workerStart',
+    expect.objectContaining({ agent: 'antigravity', on, worktree: 'id:folder:workspace_1' })
+  )
+})
diff --git a/src/cli/handlers/orchestration/worker-launch-handler.ts b/src/cli/handlers/orchestration/worker-launch-handler.ts
index b6e4d92799c..b6dddd67e35 100644
--- a/src/cli/handlers/orchestration/worker-launch-handler.ts
+++ b/src/cli/handlers/orchestration/worker-launch-handler.ts
@@ -13,6 +13,7 @@ import { renderResolvedOrchestrationCommand } from '../../orchestration-mutation
 
 export const ORCHESTRATION_WORKER_LAUNCH_HANDLER: Record<string, CommandHandler> = {
   'orchestration worker-start': async ({ flags, client, cwd, json }) => {
+    const agent = getOptionalStringFlag(flags, 'agent')
     const model = getOptionalStringFlag(flags, 'model')
     const effort = getOptionalStringFlag(flags, 'effort')
     if (model || effort) {
@@ -59,7 +60,7 @@ export const ORCHESTRATION_WORKER_LAUNCH_HANDLER: Record<string, CommandHandler>
       displayName: getOptionalStringFlag(flags, 'display-name'),
       comment: getOptionalStringFlag(flags, 'comment'),
       setup: getOptionalStringFlag(flags, 'setup'),
-      agent: getOptionalStringFlag(flags, 'agent'),
+      agent: agent === 'agy' ? 'antigravity' : agent,
       model,
       effort,
       terminal: getOptionalStringFlag(flags, 'terminal'),
diff --git a/src/cli/specs/orchestration-worker-specs.ts b/src/cli/specs/orchestration-worker-specs.ts
index 1608a586a15..e60f7a32140 100644
--- a/src/cli/specs/orchestration-worker-specs.ts
+++ b/src/cli/specs/orchestration-worker-specs.ts
@@ -32,6 +32,7 @@ export const ORCHESTRATION_WORKER_COMMAND_SPECS: CommandSpec[] = [
       'retry-request'
     ],
     notes: [
+      '--agent agy is an alias for antigravity; both use the configured Antigravity launcher.',
       'Current and existing worktrees never rerun setup; a fresh agent terminal is created unless --terminal is explicit.',
       'When reusing --terminal, pass --worktree for that terminal; current means the coordinator worktree.',
       '--model supports Claude, Codex, and Cursor opaque provider model ids; --effort requires --model. Neither can combine with --terminal.',