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fix: note about structured output #1377

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fix: note about structured output #1377

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6 changes: 6 additions & 0 deletions src/oss/langchain/middleware.mdx
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Expand Up @@ -1044,6 +1044,12 @@ Use an LLM to intelligently select relevant tools before calling the main model.
- Improving model focus and accuracy
</Tip>

<Note>
**How it works:** This middleware uses structured output to ask an LLM which tools are most relevant for the current query. The structured output schema defines the available tool names and descriptions.

Model providers often add this structured output information to the system prompt behind the scenes.
</Note>

:::python
```python
from langchain.agents import create_agent
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