fix organize agent's history messages without recalculating tokens (#4324)

Co-authored-by: chenyongzhao <chenyz@mama.cn>

api/core/agent/cot_agent_runner.py

@@ -15,6 +15,7 @@ from core.model_runtime.entities.message_entities import (
     ToolPromptMessage,
     UserPromptMessage,
 )
+from core.prompt.agent_history_prompt_transform import AgentHistoryPromptTransform
 from core.tools.entities.tool_entities import ToolInvokeMeta
 from core.tools.tool.tool import Tool
 from core.tools.tool_engine import ToolEngine
@@ -373,7 +374,7 @@ class CotAgentRunner(BaseAgentRunner, ABC):
 
         return message
 
-    def _organize_historic_prompt_messages(self) -> list[PromptMessage]:
+    def _organize_historic_prompt_messages(self, current_session_messages: list[PromptMessage] = None) -> list[PromptMessage]:
         """
             organize historic prompt messages
         """
@@ -381,6 +382,13 @@ class CotAgentRunner(BaseAgentRunner, ABC):
         scratchpad: list[AgentScratchpadUnit] = []
         current_scratchpad: AgentScratchpadUnit = None
 
+        self.history_prompt_messages = AgentHistoryPromptTransform(
+            model_config=self.model_config,
+            prompt_messages=current_session_messages or [],
+            history_messages=self.history_prompt_messages,
+            memory=self.memory
+        ).get_prompt()
+
         for message in self.history_prompt_messages:
             if isinstance(message, AssistantPromptMessage):
                 current_scratchpad = AgentScratchpadUnit(