From 1768413eca710e925cee66a15c074eacd709ab20 Mon Sep 17 00:00:00 2001
From: Your Name <your.email@example.com>
Date: Thu, 26 Mar 2026 00:31:42 +0800
Subject: [PATCH] fix agent model identity guardrails

---
 app/(chat)/api/chat/route.ts | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 7ce898814..5a17b32a5 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -3195,6 +3195,20 @@ function buildAgentSceneImageRolePrompt(params: {
       ? `如果当前场景有人物展示需求，只允许使用图片${resolvedProductCount + 1}里的模特；如果不需要人物，则不要强行加入人物。`
       : "当前没有固定模特图，不要凭空生成强人物主体。"
   );
+  if (hasModelImage) {
+    lines.push(
+      "【模特锁定约束】固定模特图是人物身份锁定图。结果中出现的人物必须与模特图为同一人，不得换脸、换人、换性别、换年龄段，不得改变五官特征、脸型、发际线、发型主体、肤色、身材和辨识度。"
+    );
+    lines.push(
+      "允许根据场景构图调整模特的站姿、坐姿、手势、视线和轻微表情，但必须让人一眼看出是同一个模特。"
+    );
+    lines.push(
+      "只有当工作流设定或补充要求里明确要求修改模特衣服、穿搭或服装颜色时，才允许更换或调整服饰；如果没有明确要求，默认保持模特原有服装风格和穿搭关系一致。"
+    );
+    lines.push(
+      "如果模特衣服被允许调整，也只能改衣服，不得借机改变模特本人；人物身份稳定性始终高于服装变化。"
+    );
+  }
 
   return lines.join("\n");
 }
@@ -7316,6 +7330,27 @@ export async function POST(request: Request) {
               modeType: "scene_generation",
               });
             const sceneGenerationStartedAt = Date.now();
+            console.info("[Chat API] Agent scene prompt guardrails:", {
+              chatId: id,
+              agentPresetId: selectedAgentPreset.id,
+              agentPresetName: selectedAgentPreset.name,
+              agentExecutionSnapshotId: presetSnapshot.id,
+              includesWorkflowPrompt: Boolean(hiddenPromptText),
+              includesUserSupplementPrompt: Boolean(sanitizedUserSupplementPrompt),
+              includesModelImage: sceneModelSlotEnabled,
+              productImageCount: sceneProductSlotCount,
+              uploadedImageCount: sharedUploadedImageUrls.length,
+              hasProductIdentityLock: sceneImageRolePrompt.includes("【产品锁定约束】"),
+              hasModelIdentityLock: sceneImageRolePrompt.includes("【模特锁定约束】"),
+              hasModelClothingOverrideRule: sceneImageRolePrompt.includes(
+                "只有当工作流设定或补充要求里明确要求修改模特衣服"
+              ),
+              imageRolePreview: sceneImageRolePrompt
+                .split("\n")
+                .map((line) => line.trim())
+                .filter(Boolean)
+                .slice(0, 12),
+            });
 
             try {
               const mergedImageParams = {