SlackToolkit Problem - sample code does not work

[ccurme]

Discussed in https://github.com/langchain-ai/langchain/discussions/28566

^{Originally posted by edwardgonen December 6, 2024}

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Example Code

from langchain_community.agent_toolkits import SlackToolkit

toolkit = SlackToolkit()

Description

I have the
SLACK_USER_TOKEN= set correctly and installed all the needed packages including slack_sdk
But the SlackToolkin() gives exception:
Exception has occurred: PydanticUserError
SlackToolkit is not fully defined; you should define WebClient, then call SlackToolkit.model_rebuild().

For further information visit https://errors.pydantic.dev/2.10/u/class-not-fully-defined
File "/Users/user/Projects/slack/main.py", line 13, in
toolkit = SlackToolkit()
^^^^^^^^^^^^^^
pydantic.errors.PydanticUserError: SlackToolkit is not fully defined; you should define WebClient, then call SlackToolkit.model_rebuild().

For further information visit https://errors.pydantic.dev/2.10/u/class-not-fully-defined

I've tried to add WebClient but then fail on get_tools().

Can anyone help?

System Info

langchain==0.3.8
langchain-anthropic==0.3.0
langchain-community==0.3.8
langchain-core==0.3.21
langchain-experimental==0.3.3
langchain-openai==0.2.10
langchain-text-splitters==0.3.2

MAC

Python 3.12.3