Board Review: Web PubSub Chat

### Responsible Service Team

Web PubSub Service

### Main Contacts

@Y-Sindo

### Expected Code Complete Date

2026-08-20

### Expected Release Date

2026-10-01

### Link to Documentation Introducing/Describing the Service

https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-overview

### Link to the Service REST APIs / TypeSpec

On the main branch:

https://github.com/Azure/azure-rest-api-specs/tree/main/specification/webpubsub/data-plane/WebPubSubChat

The in-progress PR to correct main branch REST API spec:

https://github.com/Azure/azure-rest-api-specs/pull/44881

This bug fix PR addresses an inconsistency between the REST API specification and the service implementation, and corrects the generated client.

### Link to GitHub Issue for Previous Review Sessions (if applicable)

_No response_

### Languages for this Review

- [x] .NET
- [x] Java
- [x] Python
- [x] TypeScript
- [ ] Go
- [ ] C++
- [ ] Rust

### .NET

- APIView: https://spa.apiview.dev/review/76d28ab3190f42c79c6d97f44598f33a?activeApiRevisionId=db9db18b2a3c4008bf08e2b1e34b9979
- Samples: Uploaded in APIView
- PR: https://github.com/Azure/azure-sdk-for-net/pull/61507
- README: https://github.com/Y-Sindo/azure-sdk-for-net/blob/chatserviceclient/sdk/webpubsub/Azure.Messaging.WebPubSub.Chat/README.md

### Java

- APIView: https://spa.apiview.dev/review/8465e7e6e391403e97e5411ae37ffb7e?activeApiRevisionId=774995090eb445f98b998b35168e84ac&activeSamplesRevisionId=6d1a0217058447daabcc88665e08435a
- Samples: Uploaded in APIView
- PR: https://github.com/Azure/azure-sdk-for-java/pull/50347
- README: https://github.com/Y-Sindo/azure-sdk-for-java/blob/azure-sdk-for-java-chat-serviceclient/sdk/webpubsub/azure-messaging-webpubsub-chat/README.md

### Python

- APIView: https://spa.apiview.dev/review/2347489a1f2143bc92dd4fbfa46c1994?activeApiRevisionId=7b6bc7036bcd4c629ddec31aace0d6e3
- Samples: Uploaded in APIView
- PR: https://github.com/Azure/azure-sdk-for-python/pull/48882
- README: https://github.com/Y-Sindo/azure-sdk-for-python/blob/azure-sdk-for-python-chat-serviceclient/sdk/webpubsub/azure-messaging-webpubsubchatservice/README.md

### TypeScript

- APIView: https://spa.apiview.dev/review/f94a53fc5a7043278cceb0cd71ab1f60?activeApiRevisionId=8cc092a26a28492d8dd775b00733ed51
- Samples: Uploaded in APIView
- PR: https://github.com/Azure/azure-sdk-for-js/pull/39180
- README: https://github.com/Y-Sindo/azure-sdk-for-js/blob/chatserviceclient/sdk/web-pubsub/web-pubsub-chat/README.md

### Go

_No response_

### Additional Languages (C++, Rust)

_No response_

### Confirmations

- [x] For existing packages, a diff revision is selected in APIView for each language. For brand-new packages, the initial API surface is submitted.
- [x] CI checks are passing on all linked PRs