diff --git a/astrbot/core/agent/runners/tool_loop_agent_runner.py b/astrbot/core/agent/runners/tool_loop_agent_runner.py
index 743b280070..ea31fbafea 100644
--- a/astrbot/core/agent/runners/tool_loop_agent_runner.py
+++ b/astrbot/core/agent/runners/tool_loop_agent_runner.py
@@ -189,6 +189,13 @@ async def reset(
         if request.prompt is not None:
             m = await request.assemble_context()
             messages.append(Message.model_validate(m))
+        if request.transient_extra_user_content_parts:
+            extra_msg = Message(
+                role="user",
+                content=request.transient_extra_user_content_parts,
+            )
+            extra_msg._no_save = True
+            messages.append(extra_msg)
         if request.system_prompt:
             messages.insert(
                 0,
@@ -207,7 +214,6 @@ async def _iter_llm_responses(
             "contexts": self.run_context.messages,  # list[Message]
             "func_tool": self.req.func_tool,
             "session_id": self.req.session_id,
-            "extra_user_content_parts": self.req.extra_user_content_parts,  # list[ContentPart]
         }
         if include_model:
             # For primary provider we keep explicit model selection if provided.
diff --git a/astrbot/core/provider/entities.py b/astrbot/core/provider/entities.py
index 20c5a7947d..fcacae160c 100644
--- a/astrbot/core/provider/entities.py
+++ b/astrbot/core/provider/entities.py
@@ -94,7 +94,9 @@ class ProviderRequest:
     image_urls: list[str] = field(default_factory=list)
     """图片 URL 列表"""
     extra_user_content_parts: list[ContentPart] = field(default_factory=list)
-    """额外的用户消息内容部分列表，用于在用户消息后添加额外的内容块（如系统提醒、指令等）。支持 dict 或 ContentPart 对象"""
+    """正式用户消息的一部分，会和 prompt、image_urls 一起组成当前轮用户消息，并进入消息记录。适用于应长期保留的补充信息，例如消息发送时间、发送人等。"""
+    transient_extra_user_content_parts: list[ContentPart] = field(default_factory=list)
+    """仅当前轮临时追加的用户内容块，会出现在正式用户消息之后，但不会进入消息记录。适用于只影响当前轮的补充信息，例如增强检索结果、当前语境的相似对话参考等。"""
     func_tool: ToolSet | None = None
     """可用的函数工具"""
     contexts: list[dict] = field(default_factory=list)