From 569a3d960226a72e3e1fb5091068c1788f67e869 Mon Sep 17 00:00:00 2001
From: Ali Ismail <99437500+Ali-Ismail-1@users.noreply.github.com>
Date: Mon, 15 Sep 2025 07:02:50 -0700
Subject: [PATCH] docs(langchain): add docstring for `_load_stuff_chain`
 (#32932)

**Description:**
Add a docstring to `_load_stuff_chain` in `chains/summarize/` to explain
the purpose of the `prompt` argument and document function parameters.
This addresses an existing TODO in the codebase.

**Issue:**
N/A (documentation improvement only)

**Dependencies:**
None
---
 .../langchain/chains/summarize/chain.py          | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/libs/langchain/langchain/chains/summarize/chain.py b/libs/langchain/langchain/chains/summarize/chain.py
index 145eb2e0ec6..a180a850109 100644
--- a/libs/langchain/langchain/chains/summarize/chain.py
+++ b/libs/langchain/langchain/chains/summarize/chain.py
@@ -36,7 +36,21 @@ def _load_stuff_chain(
     **kwargs: Any,
 ) -> StuffDocumentsChain:
     llm_chain = LLMChain(llm=llm, prompt=prompt, verbose=verbose)
-    # TODO: document prompt
+    """Load a StuffDocumentsChain for summarization.
+
+    Args:
+        llm: Language Model to use in the chain.
+        prompt: Prompt template that controls how the documents are formatted and
+            passed into the LLM. Defaults to `stuff_prompt.PROMPT`.
+        document_variable_name: Variable name in the prompt template where the
+            document text will be inserted. Defaults to "text".
+        verbose: Whether to log progress and intermediate steps. Defaults to None.
+        **kwargs: Additional keyword arguments passed to the StuffDocumentsChain.
+
+    Returns:
+        A StuffDocumentsChain that takes in documents, formats them with the
+        given prompt, and runs the chain on the provided LLM.
+    """
     return StuffDocumentsChain(
         llm_chain=llm_chain,
         document_variable_name=document_variable_name,