diff --git a/apps/web/lib/workbench/clarify.test.ts b/apps/web/lib/workbench/clarify.test.ts
index 4031491..e411806 100644
--- a/apps/web/lib/workbench/clarify.test.ts
+++ b/apps/web/lib/workbench/clarify.test.ts
@@ -1,8 +1,10 @@
 import { describe, expect, it } from "vitest";
 
 import {
+  PROCEED,
   foldClarifications,
   needsClarifyGate,
+  toVM,
   type ClarifyAnswer,
 } from "./clarify";
 
@@ -67,6 +69,70 @@ describe("foldClarifications", () => {
   });
 });
 
+describe("toVM", () => {
+  it("snake_case ClarifyDecision → camelCase VM，逐字段映射", () => {
+    const vm = toVM({
+      need_clarification: true,
+      questions: [
+        {
+          question: "想更冷峻还是更抒情？",
+          options: [
+            { label: "冷峻", value: "改得更冷峻克制" },
+            { label: "抒情", value: "改得更抒情" },
+          ],
+          allow_free_text: true,
+        },
+      ],
+      verification: "我这样理解对吗",
+    });
+
+    expect(vm).toEqual({
+      needClarification: true,
+      questions: [
+        {
+          question: "想更冷峻还是更抒情？",
+          options: [
+            { label: "冷峻", value: "改得更冷峻克制" },
+            { label: "抒情", value: "改得更抒情" },
+          ],
+          allowFreeText: true,
+        },
+      ],
+      verification: "我这样理解对吗",
+    });
+  });
+
+  it("字段缺省时取安全默认（空/false/undefined），不信任外部数据", () => {
+    const vm = toVM({});
+    expect(vm).toEqual({
+      needClarification: false,
+      questions: [],
+      verification: undefined,
+    });
+  });
+
+  it("questions/options 内字段缺省时逐项补默认", () => {
+    const vm = toVM({
+      need_clarification: true,
+      questions: [{ question: undefined, options: [{}], allow_free_text: undefined }],
+      verification: null,
+    });
+    expect(vm).toEqual({
+      needClarification: true,
+      questions: [
+        { question: "", options: [{ label: "", value: "" }], allowFreeText: false },
+      ],
+      verification: undefined,
+    });
+  });
+});
+
+describe("PROCEED", () => {
+  it("放行常量：不反问、无问题", () => {
+    expect(PROCEED).toEqual({ needClarification: false, questions: [] });
+  });
+});
+
 describe("needsClarifyGate", () => {
   it("去空白后长度小于 minChars 时需要预检", () => {
     expect(needsClarifyGate("改一下", 8)).toBe(true);
diff --git a/apps/web/lib/workbench/clarify.ts b/apps/web/lib/workbench/clarify.ts
index e023507..725e39f 100644
--- a/apps/web/lib/workbench/clarify.ts
+++ b/apps/web/lib/workbench/clarify.ts
@@ -62,3 +62,33 @@ export function foldClarifications(
 export function needsClarifyGate(instruction: string, minChars: number): boolean {
   return instruction.trim().length < minChars;
 }
+
+// 澄清预检结论为「放行」（直接去 refine/rewrite，不反问）——后端 error/前端异常时的确定性回退。
+export const PROCEED: ClarifyDecisionVM = { needClarification: false, questions: [] };
+
+// 后端 snake_case ClarifyDecision 的原始形状（外部数据，全部可选——不信任、显式取值 + 默认）。
+export interface ClarifyDecisionRaw {
+  need_clarification?: boolean;
+  questions?: {
+    question?: string;
+    options?: { label?: string; value?: string }[];
+    allow_free_text?: boolean;
+  }[];
+  verification?: string | null;
+}
+
+// 后端 snake_case ClarifyDecision → 前端 camelCase VM（纯映射，refine/rewrite 两侧预检共用）。
+export function toVM(data: ClarifyDecisionRaw): ClarifyDecisionVM {
+  return {
+    needClarification: Boolean(data.need_clarification),
+    questions: (data.questions ?? []).map((q) => ({
+      question: q.question ?? "",
+      options: (q.options ?? []).map((o) => ({
+        label: o.label ?? "",
+        value: o.value ?? "",
+      })),
+      allowFreeText: Boolean(q.allow_free_text),
+    })),
+    verification: data.verification ?? undefined,
+  };
+}
diff --git a/apps/web/lib/workbench/useClarify.ts b/apps/web/lib/workbench/useClarify.ts
index 5e56f18..07f06e1 100644
--- a/apps/web/lib/workbench/useClarify.ts
+++ b/apps/web/lib/workbench/useClarify.ts
@@ -3,10 +3,7 @@
 import { useCallback, useState } from "react";
 
 import { api } from "@/lib/api/client";
-import type { ClarifyDecisionVM } from "./clarify";
-
-// 澄清预检结论为「放行」（直接去 refine，不反问）——后端 error/前端异常时的确定性回退。
-const PROCEED: ClarifyDecisionVM = { needClarification: false, questions: [] };
+import { PROCEED, toVM, type ClarifyDecisionVM } from "./clarify";
 
 export type ClarifyStatus = "idle" | "checking" | "asking" | "proceed" | "error";
 
@@ -24,30 +21,6 @@ export interface UseClarify {
   reset: () => void;
 }
 
-// 后端 snake_case ClarifyDecision → 前端 camelCase VM（不信任外部数据，全部显式取值 + 默认）。
-function toVM(data: {
-  need_clarification?: boolean;
-  questions?: {
-    question?: string;
-    options?: { label?: string; value?: string }[];
-    allow_free_text?: boolean;
-  }[];
-  verification?: string | null;
-}): ClarifyDecisionVM {
-  return {
-    needClarification: Boolean(data.need_clarification),
-    questions: (data.questions ?? []).map((q) => ({
-      question: q.question ?? "",
-      options: (q.options ?? []).map((o) => ({
-        label: o.label ?? "",
-        value: o.value ?? "",
-      })),
-      allowFreeText: Boolean(q.allow_free_text),
-    })),
-    verification: data.verification ?? undefined,
-  };
-}
-
 // AI 反问澄清预检（WFW-9 M1，路线A 两阶段之「问题」阶段）。
 // 「再沟通」意见含糊/极短时先调独立非流式端点让 AI 反问；needClarification=false 或失败=放行去既有 refine。
 export function useClarify(): UseClarify {