diff --git a/astrbot/core/pipeline/process_stage/method/llm_request.py b/astrbot/core/pipeline/process_stage/method/llm_request.py
index 6cb59674b..b2245e4da 100644
--- a/astrbot/core/pipeline/process_stage/method/llm_request.py
+++ b/astrbot/core/pipeline/process_stage/method/llm_request.py
@@ -480,6 +480,9 @@ async def process(
                     new_tool_set.add_tool(tool)
             req.func_tool = new_tool_set
 
+        # 备份 req.contexts
+        backup_contexts = copy.deepcopy(req.contexts)
+
         # run agent
         agent_runner = AgentRunner()
         logger.debug(
@@ -529,6 +532,9 @@ async def process(
             async for _ in run_agent(agent_runner, self.max_step, self.show_tool_use):
                 yield
 
+        # 恢复备份的 contexts
+        req.contexts = backup_contexts
+
         await self._save_to_history(event, req, agent_runner.get_final_llm_resp())
 
         # 异步处理 WebChat 特殊情况
diff --git a/packages/astrbot/process_llm_request.py b/packages/astrbot/process_llm_request.py
index 2b785fd4d..8f17dd0dc 100644
--- a/packages/astrbot/process_llm_request.py
+++ b/packages/astrbot/process_llm_request.py
@@ -1,3 +1,4 @@
+import copy
 import astrbot.api.star as star
 import builtins
 import datetime
@@ -41,7 +42,7 @@ def _ensure_persona(self, req: ProviderRequest, cfg: dict):
         if persona:
             if prompt := persona["prompt"]:
                 req.system_prompt += prompt
-            if begin_dialogs := persona["_begin_dialogs_processed"]:
+            if begin_dialogs := copy.deepcopy(persona["_begin_dialogs_processed"]):
                 req.contexts[:0] = begin_dialogs
 
         # tools select