diff --git a/integration-tests/cli/qwen-serve-routes.test.ts b/integration-tests/cli/qwen-serve-routes.test.ts
index 71c020b309b..910f2263fb2 100644
--- a/integration-tests/cli/qwen-serve-routes.test.ts
+++ b/integration-tests/cli/qwen-serve-routes.test.ts
@@ -198,6 +198,7 @@ describe('qwen serve — capabilities envelope', () => {
       'session_prompt',
       'session_cancel',
       'session_events',
+      'typed_event_schema',
       'session_set_model',
       'client_identity',
       'permission_vote',
diff --git a/packages/cli/src/serve/capabilities.ts b/packages/cli/src/serve/capabilities.ts
index e022e27b74f..294f4dffa16 100644
--- a/packages/cli/src/serve/capabilities.ts
+++ b/packages/cli/src/serve/capabilities.ts
@@ -36,6 +36,11 @@ export const SERVE_CAPABILITY_REGISTRY = {
   session_prompt: { since: 'v1' },
   session_cancel: { since: 'v1' },
   session_events: { since: 'v1' },
+  // SDK consumers can detect `KnownDaemonEvent` schema support without
+  // pinning against this SDK release — `narrowDaemonEvent` falls back
+  // to `kind: 'unknown'` for daemons that don't advertise the tag,
+  // so the tag is purely informational.
+  typed_event_schema: { since: 'v1' },
   session_set_model: { since: 'v1' },
   client_identity: { since: 'v1' },
   permission_vote: { since: 'v1' },
diff --git a/packages/cli/src/serve/server.test.ts b/packages/cli/src/serve/server.test.ts
index 01fa01e94e9..728c94a3d7d 100644
--- a/packages/cli/src/serve/server.test.ts
+++ b/packages/cli/src/serve/server.test.ts
@@ -72,6 +72,7 @@ const EXPECTED_STAGE1_FEATURES = [
   'session_prompt',
   'session_cancel',
   'session_events',
+  'typed_event_schema',
   'session_set_model',
   'client_identity',
   'permission_vote',
diff --git a/packages/sdk-typescript/src/daemon/DaemonSessionClient.ts b/packages/sdk-typescript/src/daemon/DaemonSessionClient.ts
index 5cac0e40dbe..d8bc1dc604b 100644
--- a/packages/sdk-typescript/src/daemon/DaemonSessionClient.ts
+++ b/packages/sdk-typescript/src/daemon/DaemonSessionClient.ts
@@ -51,7 +51,8 @@ export interface DaemonSessionSubscribeOptions extends SubscribeOptions {
  * IDE, and web backends: it binds one daemon session, forwards the existing
  * Stage 1 routes, and preserves SSE replay state. It intentionally does not
  * interpret daemon event payloads; typed event reducers belong to the protocol
- * schema layer.
+ * schema layer — see `asKnownDaemonEvent` and `reduceDaemonSessionEvent` in
+ * `./events.js` for the typed consumption surface.
  */
 export class DaemonSessionClient {
   readonly client: DaemonClient;
diff --git a/packages/sdk-typescript/test/unit/daemon-public-surface.test.ts b/packages/sdk-typescript/test/unit/daemon-public-surface.test.ts
new file mode 100644
index 00000000000..c669f614a91
--- /dev/null
+++ b/packages/sdk-typescript/test/unit/daemon-public-surface.test.ts
@@ -0,0 +1,103 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, expectTypeOf } from 'vitest';
+import * as Public from '../../src/index.js';
+// Type-only imports also exercise the public entry: any name missing
+// from `src/index.ts` is a tsc compile error and the suite refuses to
+// build, which is the regression fence for the kind of "exists in
+// `src/daemon/index.ts` but not re-exported by the published entry"
+// gap that two-layer SDK re-exports are easy to drift on.
+import type {
+  DaemonClientEvictedData,
+  DaemonClientEvictedEvent,
+  DaemonControlEvent,
+  DaemonEvent,
+  DaemonEventEnvelope,
+  DaemonKnownEventType,
+  DaemonModelSwitchedData,
+  DaemonModelSwitchedEvent,
+  DaemonModelSwitchFailedData,
+  DaemonModelSwitchFailedEvent,
+  DaemonPermissionOption,
+  DaemonPermissionRequestData,
+  DaemonPermissionRequestEvent,
+  DaemonPermissionResolvedData,
+  DaemonPermissionResolvedEvent,
+  DaemonSessionDiedData,
+  DaemonSessionDiedEvent,
+  DaemonSessionEvent,
+  DaemonSessionUpdateData,
+  DaemonSessionUpdateEvent,
+  DaemonSessionViewState,
+  DaemonStreamErrorData,
+  DaemonStreamErrorEvent,
+  DaemonStreamLifecycleEvent,
+  KnownDaemonEvent,
+} from '../../src/index.js';
+
+describe('public SDK entry — typed daemon event surface (#4217)', () => {
+  it('exports the runtime narrow + reducer surface', () => {
+    expect(typeof Public.asKnownDaemonEvent).toBe('function');
+    expect(typeof Public.isKnownDaemonEvent).toBe('function');
+    expect(typeof Public.isDaemonEventType).toBe('function');
+    expect(typeof Public.reduceDaemonSessionEvent).toBe('function');
+    expect(typeof Public.reduceDaemonSessionEvents).toBe('function');
+    expect(typeof Public.createDaemonSessionViewState).toBe('function');
+  });
+
+  it('round-trips a raw DaemonEvent through the public narrow helper', () => {
+    // Pin the user-facing contract: `import { asKnownDaemonEvent }
+    // from '@qwen-code/sdk'` must work end-to-end via the published
+    // entry, not just exist as a re-export inside src/daemon/index.ts.
+    const evt: DaemonEvent = {
+      id: 1,
+      v: 1,
+      type: 'model_switched',
+      data: { sessionId: 'sess-1', modelId: 'qwen-plus' },
+    };
+    const narrowed = Public.asKnownDaemonEvent(evt);
+    if (narrowed?.type === 'model_switched') {
+      expect(narrowed.data.modelId).toBe('qwen-plus');
+    } else {
+      expect.fail('expected typed model_switched');
+    }
+  });
+
+  it('exposes the typed event schema types at the public entry (compile-time)', () => {
+    // The type-only imports at the top of this file would fail to
+    // compile if any of these names were absent from src/index.ts.
+    // The runtime expectations below document the surface set the
+    // SDK promises to ship and give tooling that ignores type-only
+    // imports a runtime assertion trail.
+    expectTypeOf<KnownDaemonEvent>().not.toBeNever();
+    expectTypeOf<DaemonSessionEvent>().not.toBeNever();
+    expectTypeOf<DaemonControlEvent>().not.toBeNever();
+    expectTypeOf<DaemonStreamLifecycleEvent>().not.toBeNever();
+    expectTypeOf<DaemonSessionViewState>().not.toBeNever();
+    expectTypeOf<DaemonKnownEventType>().not.toBeNever();
+    expectTypeOf<DaemonEventEnvelope<'foo', { x: 1 }>>().not.toBeNever();
+
+    expectTypeOf<DaemonSessionUpdateEvent>().not.toBeNever();
+    expectTypeOf<DaemonPermissionRequestEvent>().not.toBeNever();
+    expectTypeOf<DaemonPermissionResolvedEvent>().not.toBeNever();
+    expectTypeOf<DaemonModelSwitchedEvent>().not.toBeNever();
+    expectTypeOf<DaemonModelSwitchFailedEvent>().not.toBeNever();
+    expectTypeOf<DaemonSessionDiedEvent>().not.toBeNever();
+    expectTypeOf<DaemonClientEvictedEvent>().not.toBeNever();
+    expectTypeOf<DaemonStreamErrorEvent>().not.toBeNever();
+
+    expectTypeOf<DaemonSessionUpdateData>().not.toBeNever();
+    expectTypeOf<DaemonPermissionRequestData>().not.toBeNever();
+    expectTypeOf<DaemonPermissionResolvedData>().not.toBeNever();
+    expectTypeOf<DaemonModelSwitchedData>().not.toBeNever();
+    expectTypeOf<DaemonModelSwitchFailedData>().not.toBeNever();
+    expectTypeOf<DaemonSessionDiedData>().not.toBeNever();
+    expectTypeOf<DaemonClientEvictedData>().not.toBeNever();
+    expectTypeOf<DaemonStreamErrorData>().not.toBeNever();
+    expectTypeOf<DaemonPermissionOption>().not.toBeNever();
+  });
+});