What is LangChain Hub?

LangChain Hub is a public repository at smith.langchain.com/hub for sharing and versioning prompts. Teams use it to store prompts outside of application code, iterate on them without deployments, and pull specific versions into chains at runtime.

To use Hub prompts in code, install langchainhub and call hub.pull():

pip install langchainhub

from langchain import hub

# Pull a community RAG prompt (returns a ChatPromptTemplate)
rag_prompt = hub.pull("rlm/rag-prompt")

# Pin a specific commit to avoid drift
rag_prompt_v2 = hub.pull("rlm/rag-prompt:50442af1")

# Use it in a chain
chain = rag_prompt | llm | StrOutputParser()

You can also push your own prompts to the Hub from code, making them accessible to teammates or the broader community:

hub.push("your-username/my-prompt", my_prompt_template)

LangChain Hub is especially useful for teams that want to separate prompt engineering from application deployment — a prompt designer can update and version a prompt in the Hub, and the next invocation of the application picks up the latest (or pinned) version without a code deploy.

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