ReActDocstoreAgent Class — langchain Architecture

Architecture documentation for the ReActDocstoreAgent class in base.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  d5d43d15_73de_819f_ef9d_0df3b0f5c681["ReActDocstoreAgent"]
  37fcc3f3_2798_3648_915c_2bffdd19bff7["Agent"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|extends| 37fcc3f3_2798_3648_915c_2bffdd19bff7
  9ccefa56_209b_c990_304c_d902563c789e["base.py"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|defined in| 9ccefa56_209b_c990_304c_d902563c789e
  76a53ac5_8e7b_5311_c897_6551bbf7b7d7["_get_default_output_parser()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| 76a53ac5_8e7b_5311_c897_6551bbf7b7d7
  f2f35f90_85c2_6aa3_a5d5_1b83cf982518["_agent_type()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| f2f35f90_85c2_6aa3_a5d5_1b83cf982518
  33fe9ce0_badd_939d_8d17_5c349b8ab475["create_prompt()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| 33fe9ce0_badd_939d_8d17_5c349b8ab475
  aa43b201_85d4_3e68_b77d_271aa3784786["_validate_tools()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| aa43b201_85d4_3e68_b77d_271aa3784786
  f5ae6c6b_e117_5e79_6e8d_8324edfe23cd["observation_prefix()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| f5ae6c6b_e117_5e79_6e8d_8324edfe23cd
  bd116a34_9f35_4b26_7674_80231427e778["_stop()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| bd116a34_9f35_4b26_7674_80231427e778
  9a838d98_e7ad_862c_674b_b579b051aabe["llm_prefix()"]
  d5d43d15_73de_819f_ef9d_0df3b0f5c681 -->|method| 9a838d98_e7ad_862c_674b_b579b051aabe

Relationship Graph

Source Code

libs/langchain/langchain_classic/agents/react/base.py lines 36–81

class ReActDocstoreAgent(Agent):
    """Agent for the ReAct chain."""

    output_parser: AgentOutputParser = Field(default_factory=ReActOutputParser)

    @classmethod
    @override
    def _get_default_output_parser(cls, **kwargs: Any) -> AgentOutputParser:
        return ReActOutputParser()

    @property
    def _agent_type(self) -> str:
        """Return Identifier of an agent type."""
        return AgentType.REACT_DOCSTORE

    @classmethod
    @override
    def create_prompt(cls, tools: Sequence[BaseTool]) -> BasePromptTemplate:
        """Return default prompt."""
        return WIKI_PROMPT

    @classmethod
    def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
        validate_tools_single_input(cls.__name__, tools)
        super()._validate_tools(tools)
        if len(tools) != len(_LOOKUP_AND_SEARCH_TOOLS):
            msg = f"Exactly two tools must be specified, but got {tools}"
            raise ValueError(msg)
        tool_names = {tool.name for tool in tools}
        if tool_names != _LOOKUP_AND_SEARCH_TOOLS:
            msg = f"Tool names should be Lookup and Search, got {tool_names}"
            raise ValueError(msg)

    @property
    def observation_prefix(self) -> str:
        """Prefix to append the observation with."""
        return "Observation: "

    @property
    def _stop(self) -> list[str]:
        return ["\nObservation:"]

    @property
    def llm_prefix(self) -> str:
        """Prefix to append the LLM call with."""
        return "Thought:"