Fixes Chat History and Function Calling Agent.

Author: Maximilian-Winter

src/llama_cpp_agent/chat_history/basic_chat_history.py

@@ -112,9 +112,14 @@ def get_message_store(self) -> BasicChatMessageStore:
 
     def get_chat_messages(self) -> List[Dict[str, str]]:
         if self.strategy == BasicChatHistoryStrategy.last_k_messages:
-            messages = [self.message_store.get_message(0)]
-            messages.extend(self.message_store.get_last_k_messages(self.k - 1))
-            return convert_messages_to_list_of_dictionaries(messages)
+            converted_messages = convert_messages_to_list_of_dictionaries(
+                self.message_store.get_last_k_messages(self.k - 1)
+            )
+            if len(converted_messages) == self.k and converted_messages[0]["role"] != "system":
+                messages = [convert_messages_to_list_of_dictionaries(self.message_store.get_message(0))]
+                messages.extend(converted_messages[1:])
+                return messages
+            return converted_messages
         elif self.strategy == BasicChatHistoryStrategy.last_k_tokens:
             total_tokens = 0
             selected_messages = []

src/llama_cpp_agent/function_calling_agent.py

@@ -7,6 +7,7 @@
 from llama_cpp import Llama
 from pydantic import BaseModel, Field
 
+from .chat_history.messages import Roles
 from .llm_output_settings import LlmStructuredOutputSettings, LlmStructuredOutputType
 
 from .llm_agent import LlamaCppAgent, StreamingResponse
@@ -224,7 +225,7 @@ def generate_response(
         llm_sampling_settings: LlmSamplingSettings = None,
         structured_output_settings: LlmStructuredOutputSettings = None,
     ):
-        self.llama_cpp_agent.add_message(role="user", message=message)
+        self.llama_cpp_agent.add_message(role=Roles.user, message=message)
 
         result = self.intern_get_response(llm_sampling_settings=llm_sampling_settings)
 
@@ -253,7 +254,7 @@ def generate_response(
                     else:
                         function_message += f"{count}. " + res + "\n\n"
                 self.llama_cpp_agent.add_message(
-                    role="tool", message=function_message.strip()
+                    role=Roles.tool, message=function_message.strip()
                 )
                 if agent_sent_message:
                     break