From 751d8957ea8cf40940002862c65b5cf103790840 Mon Sep 17 00:00:00 2001
From: Mason Daugherty <mason@langchain.dev>
Date: Fri, 6 Feb 2026 15:22:14 -0500
Subject: [PATCH] docs(langchain-classic): warn about older
 `create_react_agent` (#35052)

---
 .../langchain_classic/_api/deprecation.py       |  1 +
 .../langchain_classic/agents/react/agent.py     | 17 ++++++++++-------
 .../chains/llm_checker/base.py                  |  2 +-
 .../chains/llm_summarization_checker/base.py    |  2 +-
 .../langchain_classic/chains/mapreduce.py       |  5 ++---
 .../langchain_classic/memory/summary.py         |  2 +-
 6 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/libs/langchain/langchain_classic/_api/deprecation.py b/libs/langchain/langchain_classic/_api/deprecation.py
index dd53c0cab03..fc53400ff13 100644
--- a/libs/langchain/langchain_classic/_api/deprecation.py
+++ b/libs/langchain/langchain_classic/_api/deprecation.py
@@ -7,6 +7,7 @@ from langchain_core._api.deprecation import (
     warn_deprecated,
 )
 
+# TODO: this is old, fix
 AGENT_DEPRECATION_WARNING = (
     "LangChain agents will continue to be supported, but it is recommended for new "
     "use cases to be built with LangGraph. LangGraph offers a more flexible and "
diff --git a/libs/langchain/langchain_classic/agents/react/agent.py b/libs/langchain/langchain_classic/agents/react/agent.py
index 9dce04145c5..f1152d480b2 100644
--- a/libs/langchain/langchain_classic/agents/react/agent.py
+++ b/libs/langchain/langchain_classic/agents/react/agent.py
@@ -28,13 +28,16 @@ def create_react_agent(
     (https://arxiv.org/abs/2210.03629)
 
     !!! warning
-       This implementation is based on the foundational ReAct paper but is older and
-       not well-suited for production applications.
-       For a more robust and feature-rich implementation, we recommend using the
-       `create_react_agent` function from the LangGraph library.
-       See the
-       [reference doc](https://langchain-ai.github.io/langgraph/reference/prebuilt/#langgraph.prebuilt.chat_agent_executor.create_react_agent)
-       for more information.
+
+        This implementation is based on the foundational ReAct paper but is older and
+        not well-suited for production applications.
+
+        For a more robust and feature-rich implementation, we recommend using the
+        `create_agent` function from the `langchain` library.
+
+        See the
+        [reference doc](https://reference.langchain.com/python/langchain/agents/)
+        for more information.
 
     Args:
         llm: LLM to use as the agent.
diff --git a/libs/langchain/langchain_classic/chains/llm_checker/base.py b/libs/langchain/langchain_classic/chains/llm_checker/base.py
index 9db3194fb3d..3f2cd4a63de 100644
--- a/libs/langchain/langchain_classic/chains/llm_checker/base.py
+++ b/libs/langchain/langchain_classic/chains/llm_checker/base.py
@@ -68,7 +68,7 @@ def _load_question_to_checked_assertions_chain(
     message=(
         "See LangGraph guides for a variety of self-reflection and corrective "
         "strategies for question-answering and other tasks: "
-        "https://langchain-ai.github.io/langgraph/tutorials/rag/langgraph_self_rag/"
+        "https://docs.langchain.com/oss/python/langchain/overview"
     ),
     removal="1.0",
 )
diff --git a/libs/langchain/langchain_classic/chains/llm_summarization_checker/base.py b/libs/langchain/langchain_classic/chains/llm_summarization_checker/base.py
index d8c9d096be1..4625df49ada 100644
--- a/libs/langchain/langchain_classic/chains/llm_summarization_checker/base.py
+++ b/libs/langchain/langchain_classic/chains/llm_summarization_checker/base.py
@@ -73,7 +73,7 @@ def _load_sequential_chain(
     message=(
         "See LangGraph guides for a variety of self-reflection and corrective "
         "strategies for question-answering and other tasks: "
-        "https://langchain-ai.github.io/langgraph/tutorials/rag/langgraph_self_rag/"
+        "https://docs.langchain.com/oss/python/langgraph/agentic-rag"
     ),
     removal="1.0",
 )
diff --git a/libs/langchain/langchain_classic/chains/mapreduce.py b/libs/langchain/langchain_classic/chains/mapreduce.py
index 1845439f7a6..6fe1c71f079 100644
--- a/libs/langchain/langchain_classic/chains/mapreduce.py
+++ b/libs/langchain/langchain_classic/chains/mapreduce.py
@@ -32,9 +32,8 @@ from langchain_classic.chains.llm import LLMChain
     removal="1.0",
     message=(
         "Refer to migration guide here for a recommended implementation using "
-        "LangGraph: https://python.langchain.com/docs/versions/migrating_chains/map_reduce_chain/"
-        ". See also LangGraph guides for map-reduce: "
-        "https://langchain-ai.github.io/langgraph/how-tos/map-reduce/."
+        "LangGraph: https://docs.langchain.com/oss/python/langgraph/graph-api#map-reduce-and-the-send-api"
+        "."
     ),
 )
 class MapReduceChain(Chain):
diff --git a/libs/langchain/langchain_classic/memory/summary.py b/libs/langchain/langchain_classic/memory/summary.py
index bd3d6e86895..32b3acb05ea 100644
--- a/libs/langchain/langchain_classic/memory/summary.py
+++ b/libs/langchain/langchain_classic/memory/summary.py
@@ -21,7 +21,7 @@ from langchain_classic.memory.prompt import SUMMARY_PROMPT
     removal="1.0",
     message=(
         "Refer here for how to incorporate summaries of conversation history: "
-        "https://langchain-ai.github.io/langgraph/how-tos/memory/add-summary-conversation-history/"
+        "https://docs.langchain.com/oss/python/langgraph/add-memory#summarize-messages"
     ),
 )
 class SummarizerMixin(BaseModel):