langchain load_tools() throws KeyError for requests

Jan 10, 2023
langchain python error
1 min read

langchain load_tools() throws KeyError for ‘requests’

Yesterday I was wiring up a quick agent and called:

from langchain.agents import load_tools
tools = load_tools(["requests"])

The import blew up with:

File ".../langchain/agents/load_tools.py", line 78, in load_tools
    tool = TOOL_NAME_TO_CLASS[name]
KeyError: 'requests'

Python 3.11, langchain 0.0.259, running on Windows 11 PowerShell.

requests was installed. The issue was that this version of langchain did not ship the RequestsTool map.

Fix:

run pip install --upgrade langchain (pulled 0.1.14)
run the script again with the same call

Everything worked.

Older langchain builds drop the mapping for some tools even when the package is present. Upgrade first; if the tool name still fails try requests_all in the list.