diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index 61ac2ab2..e01c634b 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -5643,6 +5643,22 @@
 - 复发自：BUG-351（一件带日期事件后冲突探针插队，早于采用门）
 - 修复版本：待发布
 
+## BUG-387 | staging publish 的 next build 被口语绑定 chunk 类型挡住
+
+- 状态：resolved
+- 首次发现：2026-08-26
+- 最近更新：2026-08-26
+- 影响面：`openQuestionPromptFromToolResult`、`runV9AgentTurn`、`deploy/railway-web.Dockerfile` 的 `RUN npm run build`
+- 用户现象：向 `staging` 推送 `97b02aef` 后 quality gate run `2080` 的 validate 通过，publish 在 web 镜像 `next build` 失败。没有 dispatch `Deploy staging`。公网仍为上一成功 SHA。
+- 触发条件：staging push 的 publish 镜像构建跑 `next build`。validate 对 staging push 跳过 production build。
+- 根因：运行器把流式 chunk 传给 `openQuestionPromptFromToolResult`，函数把 `payload` 收成 `{ result?: unknown; output?: unknown }`。流式 chunk 的 payload 是 `toolName` / `text` / `args`，TypeScript 判为 TS2345。日志末尾 Import traces 只是动态文件访问警告。
+- 修复：函数改收 `payload?: unknown`，再从 result/output/object 读已盖戳题干。不改 Skill `10.0.11`。
+- 验证：`npx tsc --noEmit` 不得再报 `agent-run.ts` 的 TS2345；`frontend/tests/rectification-v9-stream.test.ts`。
+- 防复发：改 `runV9AgentTurn` 流式 chunk 形状后必须跑 `npx tsc --noEmit` 或等价的 `next build`。staging push 的类型回归仍只在 publish Docker 暴露。
+- 相关记录：BUG-309、BUG-365、BUG-371、BUG-384
+- 复发自：BUG-309（validate 跳过 `next build`，publish 才暴露类型错误）；BUG-384 口语绑定收窄了 payload
+- 修复版本：待发布
+
 ## BUG-379 | 生时纠正已记入学后仍编造高考年并再问入学
 
 - 状态：resolved
diff --git a/frontend/src/lib/rectification-agentic/v9/turn-narration.ts b/frontend/src/lib/rectification-agentic/v9/turn-narration.ts
index 71a1a113..2db2f29a 100644
--- a/frontend/src/lib/rectification-agentic/v9/turn-narration.ts
+++ b/frontend/src/lib/rectification-agentic/v9/turn-narration.ts
@@ -48,12 +48,15 @@ export function readOpenQuestionPrompt(value: unknown): string | null {
 
 export function openQuestionPromptFromToolResult(chunk: {
   type?: string;
-  payload?: { result?: unknown; output?: unknown };
+  payload?: unknown;
   object?: unknown;
 }): string | null {
   if (chunk.type !== "tool-result") return null;
-  return readOpenQuestionPrompt(chunk.payload?.result)
-    ?? readOpenQuestionPrompt(chunk.payload?.output)
+  const payload = chunk.payload && typeof chunk.payload === "object" && !Array.isArray(chunk.payload)
+    ? chunk.payload as Record<string, unknown>
+    : null;
+  return readOpenQuestionPrompt(payload?.result)
+    ?? readOpenQuestionPrompt(payload?.output)
     ?? readOpenQuestionPrompt(chunk.object)
     ?? readOpenQuestionPrompt(chunk.payload);
 }
diff --git a/frontend/tests/rectification-agentic-entry.test.ts b/frontend/tests/rectification-agentic-entry.test.ts
index 9a3d8ee4..fa46882f 100644
--- a/frontend/tests/rectification-agentic-entry.test.ts
+++ b/frontend/tests/rectification-agentic-entry.test.ts
@@ -245,6 +245,11 @@ test("usage completes or releases without hiding settlement failures", () => {
   assert.match(run, /if \(!answerText\.trim\(\)\) \{[\s\S]*composeRectificationTurnNarration/);
   assert.match(run, /bindSpokenToOpenQuestion/);
   assert.match(run, /openQuestionPromptFromToolResult/);
+  const narration = readFileSync(
+    new URL("../src/lib/rectification-agentic/v9/turn-narration.ts", import.meta.url),
+    "utf8",
+  );
+  assert.match(narration, /payload\?: unknown/);
   assert.doesNotMatch(run, /splitRectificationSpokenAndThinking/);
   assert.match(run, /emit\(event: PublicStreamEvent\): Promise<void> \| void;/);
   assert.match(run, /agentGenerationSettings\(options\.generationModel, \{[\s\S]*thinking: "enabled"/);
diff --git a/frontend/tests/rectification-v9-stream.test.ts b/frontend/tests/rectification-v9-stream.test.ts
index 56b354e4..9146a173 100644
--- a/frontend/tests/rectification-v9-stream.test.ts
+++ b/frontend/tests/rectification-v9-stream.test.ts
@@ -1371,7 +1371,7 @@ test("persisted choice prompt replaces a competing model follow-up without a top
   );
   assert.equal(openQuestionPromptFromToolResult({
     type: "tool-result",
-    payload: { result: { open_question: { prompt } } },
+    payload: { toolName: "rectification-record-evidence-batch", result: { open_question: { prompt } } },
   }), prompt);
 
   const { options, emitted } = runOptions({