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Chain-of-Note (Wikipedia)

Implements Chain-of-Note as described in by Yu, et al. Uses Wikipedia for retrieval.

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Environment Setup​

Uses Anthropic claude-3-sonnet-20240229 chat model. Set Anthropic API key:

export ANTHROPIC_API_KEY="..."


To use this package, you should first have the LangChain CLI installed:

pip install -U "langchain-cli[serve]"

To create a new LangChain project and install this as the only package, you can do:

langchain app new my-app --package chain-of-note-wiki

If you want to add this to an existing project, you can just run:

langchain app add chain-of-note-wiki

And add the following code to your file:

from chain_of_note_wiki import chain as chain_of_note_wiki_chain

add_routes(app, chain_of_note_wiki_chain, path="/chain-of-note-wiki")

(Optional) Let's now configure LangSmith. LangSmith will help us trace, monitor and debug LangChain applications. You can sign up for LangSmith here. If you don't have access, you can skip this section

export LANGCHAIN_API_KEY=<your-api-key>
export LANGCHAIN_PROJECT=<your-project> # if not specified, defaults to "default"

If you are inside this directory, then you can spin up a LangServe instance directly by:

langchain serve

This will start the FastAPI app with a server is running locally at http://localhost:8000

We can see all templates at We can access the playground at

We can access the template from code with:

from langserve.client import RemoteRunnable

runnable = RemoteRunnable("http://localhost:8000/chain-of-note-wiki")

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