[LI (ktz03)]

Motivation & Context

The built-in chat-client sample guide recommends openai_responses and azure_openai_responses, but get_client() accepts openai_chat and azure_openai_chat. Following either documented selector reaches the factory's unsupported-name error instead of selecting the intended client.

Description & Review Guide

• What are the major changes? Correct the two selector names in the startup example, available-client list, and environment-variable descriptions. Clarify that main() receives the name and calls get_client() internally.
• What is the impact of these changes? Documentation only. The factory, accepted selector names, clients, and runtime behavior are unchanged.
• What do you want reviewers to focus on? Agreement with the sample's existing ClientName, factory branches, default argument, and entry point. Isolated checks executed the unchanged factory body with inert constructors: both old documented names raised ValueError, while the corrected eight-name list was accepted and six unchanged selectors remained controls. No SDK client, credential, full sample, model call, or build was run.

Related Issue

N/A - trivial change. These are stale string arguments and an inaccurate call-flow description; the correction follows the existing sample without adding aliases or changing its behavior.

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: Codex: documentation and this PR 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.

[Copilot]

🟢 Approval recommended

The documentation-only corrections match the sample’s accepted selectors and call flow, with no unresolved findings.

No open issues 🎉

What changed in this PR

Corrects the built-in chat-client sample guide to match the existing factory selectors and call flow. Runtime behavior is unchanged.

Changes:

• Replaces stale selectors with openai_chat and azure_openai_chat in the startup example, client list, and environment-variable descriptions.
• Clarifies that main() receives a client name and calls get_client() internally.

File	Description
python/​samples/​02-agents/​chat_client/​README.md	Aligns documented selectors and call flow with the existing sample.

_{Review effort: Balanced}