from typing import Optional from langchain_core.callbacks import CallbackManagerForToolRun from langchain_core.pydantic_v1 import Field from langchain_core.tools import BaseTool from langchain_community.utilities.pubmed import PubMedAPIWrapper class PubmedQueryRun(BaseTool): """Tool that searches the PubMed API.""" name: str = "PubMed" description: str = ( "A wrapper around PubMed. " "Useful for when you need to answer questions about medicine, health, " "and biomedical topics " "from biomedical literature, MEDLINE, life science journals, and online books. " "Input should be a search query." ) api_wrapper: PubMedAPIWrapper = Field(default_factory=PubMedAPIWrapper) def _run( self, query: str, run_manager: Optional[CallbackManagerForToolRun] = None, ) -> str: """Use the PubMed tool.""" return self.api_wrapper.run(query)