langchain agents executor throws: assert generation is not None about langchain

[lucas-tucker]

This seems to be fixed in langchain 0.2.2

[archine]

This seems to be fixed in langchain 0.2.2

No, I upgraded to 0.2.3, and using the official example, assert generation is not None

from langchain.agents import create_tool_calling_agent,AgentExecutor
from langchain_core.prompts import ChatPromptTemplate
from langchain_core.tools import tool
from langchain_openai import ChatOpenAI


if __name__ == '__main__':
    llm = ChatOpenAI(...)

    @tool
    def magic_function(input: int) -> int:
        """Applies a magic function to an input."""
        return input + 2


    tools = [magic_function]

    query = "what is the value of magic_function(3)?"

    prompt = ChatPromptTemplate.from_messages(
        [
            ("system", "You are a helpful assistant"),
            ("human", "{input}"),
            # Placeholders fill up a **list** of messages
            ("placeholder", "{agent_scratchpad}"),
        ]
    )

    agent = create_tool_calling_agent(llm, tools, prompt)
    agent_executor = AgentExecutor(agent=agent, tools=tools)

    agent_executor.invoke({"input": query})

Related version

langchain==0.2.3
langchain-community==0.2.3
langchain-core==0.2.3
langchain-openai==0.1.8

[lucas-tucker]

I cannot seem to replicate the error, even after upgrading to 0.2.3. How are you creating llm? Also could you please clarify what the "official example" is?

[archine]

I cannot seem to replicate the error, even after upgrading to 0.2.3. How are you creating llm? Also could you please clarify what the "official example" is?

I re-edited the sample code in my last answer, which is a demo from the dependency library comments。