fix: allow passing curly braces in system instructions to the Agent component (#5092)

update agent system instructions

src/backend/base/langflow/base/agents/agent.py

@@ -137,6 +137,8 @@ class LCAgentComponent(Component):
                 max_iterations=max_iterations,
             )
         input_dict: dict[str, str | list[BaseMessage]] = {"input": self.input_value}
+        if hasattr(self, "system_prompt"):
+            input_dict["system_prompt"] = self.system_prompt
         if hasattr(self, "chat_history") and self.chat_history:
             input_dict["chat_history"] = data_to_messages(self.chat_history)
 

src/backend/base/langflow/components/langchain_utilities/tool_calling.py

@@ -42,7 +42,7 @@ class ToolCallingAgentComponent(LCToolsAgentComponent):
 
     def create_agent_runnable(self):
         messages = [
-            ("system", self.system_prompt),
+            ("system", "{system_prompt}"),
             ("placeholder", "{chat_history}"),
             ("human", "{input}"),
             ("placeholder", "{agent_scratchpad}"),