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genai-toolbox/docs/en/samples/pre_post_processing/python.md
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(Python) Pre and post processing docs 4 How to add pre and post processing to your Python toolbox applications.

Prerequisites

This tutorial assumes that you have set up a basic toolbox application as described in the local quickstart.

This guide demonstrates how to implement these patterns in your Toolbox applications.

Python

{{< tabpane persist=header >}} {{% tab header="ADK" text=true %}} Coming soon. {{% /tab %}} {{% tab header="Langchain" text=true %}} The following example demonstrates how to use ToolboxClient with LangChain's middleware to implement pre and post processing for tool calls.

{{< include "python/langchain/agent.py" >}}

For more information, see the LangChain Middleware documentation. You can also add model-level (wrap_model) and agent-level (before_agent, after_agent) hooks to intercept messages at different stages of the execution loop. See the LangChain Middleware documentation for details on these additional hook types. {{% /tab %}} {{< /tabpane >}}