diff --git a/.memory/worklog.json b/.memory/worklog.json
index cbeaa76..f3126f5 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1,18 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 1,
-      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：auto-save 2026-05-17 19:48 (~4)",
-      "ts": "2026-05-17T11:48:28Z",
-      "type": "session-heartbeat"
-    },
-    {
-      "files_changed": 3,
-      "hash": "fc48499",
-      "message": "feat: standardize product asset inputs",
-      "ts": "2026-05-17T19:53:03+08:00",
-      "type": "commit"
-    },
     {
       "files_changed": 3,
       "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 3 项未提交变更 · 最近提交：feat: standardize product asset inputs",
@@ -3252,6 +3239,19 @@
       "type": "session-heartbeat",
       "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：chore: update worklog",
       "files_changed": 1
+    },
+    {
+      "ts": "2026-05-20T13:03:41+08:00",
+      "type": "commit",
+      "message": "docs: record subject agent direction",
+      "hash": "83b151d",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-20T05:03:57Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：docs: record subject agent direction",
+      "files_changed": 1
     }
   ]
 }
diff --git a/api/main.py b/api/main.py
index 854ebe7..74e7c00 100644
--- a/api/main.py
+++ b/api/main.py
@@ -23,7 +23,7 @@ from dotenv import load_dotenv
 from fastapi import BackgroundTasks, FastAPI, File, Form, HTTPException, Request, Response, UploadFile
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, ConfigDict, Field
 
 load_dotenv()
 
@@ -738,6 +738,8 @@ class AudioScript(BaseModel):
 
 
 class SubjectAgentAnalysis(BaseModel):
+    model_config = ConfigDict(protected_namespaces=())
+
     model_bundle: SubjectModelBundle = "gpt"
     model: str = ""
     source_frame_indices: list[int] = Field(default_factory=list)
@@ -758,6 +760,8 @@ class SubjectAgentMessage(BaseModel):
 
 
 class SubjectAgentState(BaseModel):
+    model_config = ConfigDict(protected_namespaces=())
+
     model_bundle: SubjectModelBundle = "gpt"
     source_frame_indices: list[int] = Field(default_factory=list)
     analysis: SubjectAgentAnalysis | None = None
@@ -4164,11 +4168,15 @@ class CreateJobReq(BaseModel):
 
 
 class SubjectAgentAnalyzeReq(BaseModel):
+    model_config = ConfigDict(protected_namespaces=())
+
     model_bundle: SubjectModelBundle = "gpt"
     source_frame_indices: list[int] = Field(default_factory=list)
 
 
 class SubjectAgentMessageReq(BaseModel):
+    model_config = ConfigDict(protected_namespaces=())
+
     model_bundle: SubjectModelBundle = "gpt"
     source_frame_indices: list[int] = Field(default_factory=list)
     selected_mode: Literal["realistic", "cartoon", "elements", "custom"] = "custom"