diff --git a/packages/agent-bundle/tests/route-register-typegen.test.ts b/packages/agent-bundle/tests/route-register-typegen.test.ts
index 339cca46f..50469e5b5 100644
--- a/packages/agent-bundle/tests/route-register-typegen.test.ts
+++ b/packages/agent-bundle/tests/route-register-typegen.test.ts
@@ -172,8 +172,8 @@ it('types every route-aware public surface from the generated route registration
       "export type FindResult = Assert<Equal<RegisteredRouteResult<'tool:curator/find'>, { hits: number }>>;",
       "export type Unregistered = Assert<Equal<RegisteredRouteInput<'tool:curator/missing'>, unknown>>;",
       '// An event route registers the harness payload — the component props without the `signal` the harness',
-      '// injects — and no result, since event modules export no resultSchema.',
-      "export type EventInput = Assert<Equal<keyof RegisteredRouteInput<'event:tool/after'>, 'canonical' | 'native'>>;",
+      '// injects, including the optional preflight `data` (#661) — and no result, since event modules export no resultSchema.',
+      "export type EventInput = Assert<Equal<keyof RegisteredRouteInput<'event:tool/after'>, 'canonical' | 'native' | 'preflight'>>;",
       "export type EventCanonical = Assert<Equal<RegisteredRouteInput<'event:tool/after'>['canonical'], AgentEventCanonicalIdentity<'tool/after'>>>;",
       '// The route\'s family narrows `canonical.payload`: tool/after fields are present, stop-only fields are not.',
       "export type EventPayload = Assert<Equal<RegisteredRouteInput<'event:tool/after'>['canonical']['payload'], AgentEventPayload<'tool/after'>>>;",
diff --git a/website/docs/en/guide/development/testing.mdx b/website/docs/en/guide/development/testing.mdx
index 850f16a9b..6e06c3a66 100644
--- a/website/docs/en/guide/development/testing.mdx
+++ b/website/docs/en/guide/development/testing.mdx
@@ -76,7 +76,7 @@ const chapters: number | undefined = result?.chapters; // no cast
 ```
 
 An event route registers what the harness actually takes and gives back: `input` is the
-`{ canonical, native }` payload (the harness supplies `signal` itself), and `result` is
+`{ canonical, native, preflight? }` payload (the harness supplies `signal` itself), and `result` is
 `undefined`, since event modules export no `resultSchema`. Build that input from a host envelope
 with `createEventRouteInput('tool/after', envelope, { host: 'claude' })` rather than by hand: it
 validates the envelope per host and event and projects `canonical.payload` through the same table
diff --git a/website/docs/zh/guide/development/testing.mdx b/website/docs/zh/guide/development/testing.mdx
index b98fd5fea..f03ba6892 100644
--- a/website/docs/zh/guide/development/testing.mdx
+++ b/website/docs/zh/guide/development/testing.mdx
@@ -66,7 +66,7 @@ const { result } = await renderRoute('tool:library/summarize', {
 const chapters: number | undefined = result?.chapters; // 无需强制类型转换
 ```
 
-事件路由注册的是测试工具实际接受与返回的内容：`input` 是 `{ canonical, native }` 载荷（`signal` 由测试
+事件路由注册的是测试工具实际接受与返回的内容：`input` 是 `{ canonical, native, preflight? }` 载荷（`signal` 由测试
 工具自行提供），而 `result` 为 `undefined`，因为事件模块不导出 `resultSchema`。请用
 `createEventRouteInput('tool/after', envelope, { host: 'claude' })` 从宿主信封构造这个输入，而不要手写：它按
 宿主与事件校验信封，并通过与制品包装器相同的表投影出 `canonical.payload`；标注为