.NET: [Durable Agents] Reliable streaming sample

[Chris Gillum (cgillum)]

Motivation and Context

Interactive clients require streaming support, something that durable agents doesn't support out-of-the-box. A sample is needed to demonstrate how this can be achieved, in this case with the help of Redis streaming.

Tracked by #2644

Description

This .NET samples shows how to use Redis streams in an Azure Functions app to implement agent response streaming for durable agents. The sample also provides a step-by-step guide demonstrating how to resume broken streams. This sample is a bit more comprehensive than the other samples.

No product code is changed in this PR, though a new dependency on StackExchange.Redis has been added to central package management.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Copilot]

Pull request overview

This PR introduces a new comprehensive sample (08_ReliableStreaming) demonstrating how to implement reliable streaming for durable agents using Redis Streams. The sample enables clients to disconnect and reconnect to ongoing agent responses without losing messages, inspired by OpenAI's background mode for the Responses API.

Key Changes

• New sample demonstrating Redis Streams integration for reliable agent response streaming with cursor-based resumption
• Support for both Server-Sent Events (SSE) and plain text streaming formats based on Accept headers
• Integration test validation with automated Redis container management in CI/CD pipeline

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
dotnet/samples/AzureFunctions/08_ReliableStreaming/08_ReliableStreaming.csproj	Project configuration with StackExchange.Redis dependency
dotnet/samples/AzureFunctions/08_ReliableStreaming/Program.cs	Application entry point configuring Redis connection, travel planner agent, and response handler
dotnet/samples/AzureFunctions/08_ReliableStreaming/FunctionTriggers.cs	HTTP endpoints for creating and resuming streams with content negotiation support
dotnet/samples/AzureFunctions/08_ReliableStreaming/RedisStreamResponseHandler.cs	IAgentResponseHandler implementation publishing responses to Redis Streams with TTL management
dotnet/samples/AzureFunctions/08_ReliableStreaming/Tools.cs	Mock travel tools providing weather forecasts and local events for demonstration
dotnet/samples/AzureFunctions/08_ReliableStreaming/README.md	Comprehensive documentation with step-by-step instructions for testing stream interruption and resumption
dotnet/samples/AzureFunctions/08_ReliableStreaming/host.json	Azure Functions host configuration for durable task extensions
dotnet/samples/AzureFunctions/08_ReliableStreaming/local.settings.json	Local development settings including Redis connection configuration
dotnet/samples/AzureFunctions/README.md	Updated parent README to reference new sample
dotnet/tests/Microsoft.Agents.AI.Hosting.AzureFunctions.IntegrationTests/SamplesValidation.cs	Integration test validating stream creation, interruption, and resumption with Redis container setup
dotnet/agent-framework-dotnet.slnx	Solution file updated to include new sample project
dotnet/Directory.Packages.props	Added StackExchange.Redis package version for central package management
.github/actions/azure-functions-integration-setup/action.yml	CI/CD setup for starting and managing Redis container in integration tests