diff --git a/apps/web/lib/review/useAccept.ts b/apps/web/lib/review/useAccept.ts
index 32d2ea3..6aa9f12 100644
--- a/apps/web/lib/review/useAccept.ts
+++ b/apps/web/lib/review/useAccept.ts
@@ -4,6 +4,7 @@ import { useCallback, useState } from "react";
 
 import { api } from "@/lib/api/client";
 import { useToast } from "@/components/Toast";
+import type { components } from "@/lib/api/schema";
 import type { AcceptResponse } from "@/lib/api/types";
 import { buildAcceptRequest, type DecisionDraft } from "./decisions";
 
@@ -29,12 +30,13 @@ export interface UseAccept {
   ) => Promise<AcceptOutcome>;
 }
 
-interface ApiErrorEnvelope {
-  error?: {
-    code?: string;
-    message?: string;
-    details?: { missing_conflict_indices?: number[] } | null;
-  };
+// 错误信封形状从后端 OpenAPI 生成的 schema 派生，避免与契约漂移（不再手抄字段）。
+type ApiErrorEnvelope = components["schemas"]["ErrorEnvelope"];
+
+// accept 端点 409 CONFLICT_UNRESOLVED 在 details 里携带缺判下标；
+// 生成 schema 的 details 为松散 `{[k]: unknown}`，此处就地收窄该端点专属字段。
+interface ConflictErrorDetails {
+  missing_conflict_indices?: number[];
 }
 
 // 验收：乐观置 accepting → 成功置 accepted（呈现「本次将更新」清单）；
@@ -59,7 +61,8 @@ export function useAccept(): UseAccept {
         setStatus("error");
         const env = error as ApiErrorEnvelope | undefined;
         const code = env?.error?.code;
-        const missing = env?.error?.details?.missing_conflict_indices ?? [];
+        const details = env?.error?.details as ConflictErrorDetails | undefined;
+        const missing = details?.missing_conflict_indices ?? [];
         if (code === "CONFLICT_UNRESOLVED") {
           return { result: null, missingIndices: missing, conflictUnresolved: true };
         }