DOC: HuggingFaceEndpoint Requires Explicit task Argument, but Documentation Omits It

[jasminaaa20]

URL

https://python.langchain.com/docs/integrations/document_loaders/docling/

Checklist

• I added a very descriptive title to this issue.
• I included a link to the documentation page I am referring to (if applicable).

Issue with current documentation:

Issue Description

The current LangChain documentation does not specify that the HuggingFaceEndpoint class requires an explicit task argument when using Hugging Face models.

Running the provided documentation code results in an error due to the missing task argument, with huggingface_hub == 0.28.1.

Affected Documentation Code

from langchain.chains import create_retrieval_chain
from langchain.chains.combine_documents import create_stuff_documents_chain
from langchain_huggingface import HuggingFaceEndpoint

retriever = vectorstore.as_retriever(search_kwargs={"k": TOP_K})
llm = HuggingFaceEndpoint(
    repo_id=GEN_MODEL_ID,
    huggingfacehub_api_token=HF_TOKEN,  # Missing task argument
)

Error Message (from Colab)

ValueError                                Traceback (most recent call last)
[<ipython-input-14-d478845450c0>](https://localhost:8080/#) in <cell line: 0>()
      1 question_answer_chain = create_stuff_documents_chain(llm, PROMPT)
      2 rag_chain = create_retrieval_chain(retriever, question_answer_chain)
----> 3 resp_dict = rag_chain.invoke({"input": QUESTION})
      4 
      5 clipped_answer = clip_text(resp_dict["answer"], threshold=350)
...
[/usr/local/lib/python3.11/dist-packages/huggingface_hub/inference/_providers/hf_inference.py](https://localhost:8080/#) in get_recommended_model(task)
     50     model = _fetch_recommended_models().get(task)
     51     if model is None:
---> 52         raise ValueError(
     53             f"Task {task} has no recommended model. Please specify a model"
     54             " explicitly. Visit https://huggingface.co/tasks for more info."

ValueError: Task unknown has no recommended model. Please specify a model explicitly. Visit https://huggingface.co/tasks for more info.

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Environment Details

• LangChain Version: latest
• Hugging Face Hub Version: 0.28.1
• Python Version: 3.11
• Runtime: Google Colab

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Reproduction Steps

1. Run the documentation example in Google Colab or any Python environment with huggingface_hub == 0.28.1.
2. Observe the deprecation warning and ValueError related to missing task.
3. Modify the code to explicitly add task="text-generation" → The issue gets resolved.

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Screenshots

Attached below is an image of the error message that comes up when I run the documentation notebook in Colab.

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This issue ensures better onboarding for LangChain users and prevents errors in production. 🚀

Idea or request for content:

No response