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docs: update the code snippet for LangGraph Agent template #4856

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Jan 16, 2025
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docs: update the code snippet for LangGraph Agent template #4856

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17 changes: 6 additions & 11 deletions vertexai/preview/reasoning_engines/templates/langgraph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -260,23 +260,18 @@ def __init__(
llm = ChatVertexAI(model_name=model, **model_kwargs)

# runnable_builder
from langchain import agents
from langchain_core.runnables.history import RunnableWithMessageHistory
from langgraph.prebuilt import create_react_agent
llm_with_tools = llm.bind_tools(tools=tools, **model_tool_kwargs)
agent_executor = agents.AgentExecutor(
agent=prompt | llm_with_tools | output_parser,
runnable = create_react_agent(
llm_with_tools,
tools=tools,
**agent_executor_kwargs,
)
runnable = RunnableWithMessageHistory(
runnable=agent_executor,
get_session_history=chat_history,
**runnable_kwargs,
)
```

By default, no checkpointer is used. To enable checkpointing, provide a
`checkpointer_builder` function that returns a checkpointer instance.
By default, no checkpointer is used (i.e. there is no state history). To
enable checkpointing, provide a `checkpointer_builder` function that
returns a checkpointer instance.

**Example using Spanner:**
```python
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