fix history content from agent memory. (#899)

* fix history content from agent memory.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

comps/agent/langchain/src/strategy/react/planner.py

@@ -147,6 +147,7 @@ async def non_streaming_run(self, query, config):
 
 from ...persistence import AgentPersistence, PersistenceConfig
 from ...utils import setup_chat_model
+from .utils import assemble_history, assemble_memory, convert_json_to_tool_call
 
 
 class AgentState(TypedDict):
@@ -174,16 +175,20 @@ def __init__(self, tools, args):
         llm = setup_chat_model(args)
         self.tools = tools
         self.chain = prompt | llm | output_parser
+        self.with_memory = args.with_memory
 
     def __call__(self, state):
-        from .utils import assemble_history, convert_json_to_tool_call
 
         print("---CALL Agent node---")
         messages = state["messages"]
 
         # assemble a prompt from messages
-        query = messages[0].content
-        history = assemble_history(messages)
+        if self.with_memory:
+            query, history = assemble_memory(messages)
+            print("@@@ Query: ", history)
+        else:
+            query = messages[0].content
+            history = assemble_history(messages)
         print("@@@ History: ", history)
 
         tools_descriptions = tool_renderer(self.tools)

comps/agent/langchain/src/strategy/react/utils.py

@@ -5,7 +5,7 @@
 import uuid
 
 from huggingface_hub import ChatCompletionOutputFunctionDefinition, ChatCompletionOutputToolCall
-from langchain_core.messages import AIMessage, ToolMessage
+from langchain_core.messages import AIMessage, HumanMessage, ToolMessage
 from langchain_core.messages.tool import ToolCall
 from langchain_core.output_parsers import BaseOutputParser
 
@@ -82,3 +82,41 @@ def assemble_history(messages):
                 query_history += f"Assistant Output: {m.content}\n"
 
     return query_history
+
+
+def assemble_memory(messages):
+    """
+    messages: Human, AI, TOOL, AI, TOOL, etc.
+    """
+    query = ""
+    query_id = None
+    query_history = ""
+    breaker = "-" * 10
+
+    # get query
+    for m in messages[::-1]:
+        if isinstance(m, HumanMessage):
+            query = m.content
+            query_id = m.id
+            break
+
+    for m in messages:
+        if isinstance(m, AIMessage):
+            # if there is tool call
+            if hasattr(m, "tool_calls") and len(m.tool_calls) > 0:
+                for tool_call in m.tool_calls:
+                    tool = tool_call["name"]
+                    tc_args = tool_call["args"]
+                    id = tool_call["id"]
+                    tool_output = get_tool_output(messages, id)
+                    query_history += f"Tool Call: {tool} - {tc_args}\nTool Output: {tool_output}\n{breaker}\n"
+            else:
+                # did not make tool calls
+                query_history += f"Assistant Output: {m.content}\n"
+
+        elif isinstance(m, HumanMessage):
+            if m.id == query_id:
+                continue
+            query_history += f"Human Input: {m.content}\n"
+
+    return query, query_history