[Naveen Chatlapalli (1aifanatic)]

Motivation & Context

The PurviewChatPolicyMiddleware docstring and the Purview README's "Store and retention" snippet both build a client with ChatClient(...). agent_framework has no ChatClient, so from agent_framework import ChatClient raises ImportError. The README snippet then assigns client.chat_middleware instead of passing middleware= to the constructor. That works, but it doesn't match the other snippets in the same README.

Description & Review Guide

• What are the major changes?
  • Docstring: use OpenAIChatClient(middleware=[PurviewChatPolicyMiddleware(...)]), and add the blank line that .. code-block:: needs to render.
  • README: same constructor form. That section is about Responses-style storage, so OpenAIChatClient (Responses API, stores by default) is the client the surrounding text describes.
• What is the impact of these changes? Documentation only.
• What do you want reviewers to focus on? Nothing in particular.

I ran both snippets: the client carries PurviewChatPolicyMiddleware in chat_middleware, and the README agent has store=False in its default options.

Related Issue

N/A - trivial change: two documentation snippets are corrected to an existing chat client class.

AI Assistance

• No material AI assistance was used.
• This is an AI-assisted contribution. I reviewed, understood, and verified all submitted content and accept responsibility for it.

AI assistance details: Claude Code helped find the missing import by executing the docstring examples, make the change, verify the snippets, and draft this description.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR links to an agreed issue with no competing open PR, or the Related Issue section documents a trivial-change or repository-automation exception.
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

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🟢 Approval recommended

No active review issues are reported for the documentation-only corrections to the Purview middleware examples.

No open issues 🎉

What changed in this PR

This documentation-only PR corrects Purview chat middleware examples to use the existing OpenAIChatClient class instead of the nonexistent ChatClient.

Changes:

• Updates both examples to configure Purview middleware through the client constructor.
• Corrects the docstring import and adds the blank line required for code-block rendering.

File	Description
python/​packages/​purview/​README.md	Updates the storage and retention example to use OpenAIChatClient(middleware=...).
python/​packages/​purview/​agent_framework_purview/​_middleware.py	Corrects the client import, construction, and code-block formatting in the middleware docstring.

_{Review effort: Balanced}