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docs: clarify SystemMessage usage in LangGraph agent notebook (#32320) (#32346)

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Closes #32320

This PR updates the `langgraph_agentic_rag.ipynb` notebook to clarify
that LangGraph does not automatically prepend a `SystemMessage`. A
markdown note and an inline Python comment have been added to guide
users to explicitly include a `SystemMessage` when needed.

This improves documentation for developers working with LangGraph-based
agents and avoids confusion about system-level behavior not being
applied.

---------

Co-authored-by: Mason Daugherty <mason@langchain.dev>
This commit is contained in:
Divyanshu Gupta 2025-08-12 01:19:42 +05:30 committed by GitHub
parent 5ccdcd7b7b
commit 11a54b1f1a
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cookbook/langgraph_agentic_rag.ipynb
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@ -79,6 +79,17 @@
"tool_executor = ToolExecutor(tools)" "tool_executor = ToolExecutor(tools)"
] ]
}, },
{
"cell_type": "markdown",
"id": "168152fc",
"metadata": {},
"source": [
"📘 **Note on `SystemMessage` usage with LangGraph-based agents**\n",
"\n",
"When constructing the `messages` list for an agent, you *must* manually include any `SystemMessage`s.\n",
"Unlike some agent executors in LangChain that set a default, LangGraph requires explicit inclusion."
]
},
{ {
"cell_type": "markdown", "cell_type": "markdown",
"id": "fe6e8f78-1ef7-42ad-b2bf-835ed5850553", "id": "fe6e8f78-1ef7-42ad-b2bf-835ed5850553",