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.NET: Implement Task support for A2A Hosting package - #3732
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Korolev Dmitry (DeagleGross)had a problem deploying
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Pull request overview
This PR adds comprehensive Task support to the A2A Hosting package, implementing the A2A protocol's Task lifecycle management capabilities for long-running agent operations.
Changes:
- Introduces
A2AResponseModeenum to control whether responses are returned asAgentMessage(lightweight),AgentTask(stateful), or determined automatically - Implements full task lifecycle with
OnTaskUpdatedandOnTaskCancelledhandlers for background operation polling - Adds continuation token persistence in task metadata for resumable long-running operations
- Introduces
A2AHostingJsonUtilitiesfor AOT-friendly serialization with proper resolver chaining
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
dotnet/src/Microsoft.Agents.AI.Hosting.A2A/AIAgentExtensions.cs | Core implementation of task support with OnMessageReceived, OnTaskUpdated, and OnTaskCancelled handlers; continuation token storage/retrieval logic |
dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AResponseMode.cs | New enum defining three response modes: Auto (default), Message, and Task |
dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AHostingJsonUtilities.cs | JSON serialization utilities with proper TypeInfoResolver chaining for AOT support |
dotnet/src/Microsoft.Agents.AI.Hosting.A2A/Converters/AdditionalPropertiesDictionaryExtensions.cs | Updated to use A2AHostingJsonUtilities instead of A2AJsonUtilities for consistency |
dotnet/src/Microsoft.Agents.AI.Hosting.A2A.AspNetCore/EndpointRouteBuilderExtensions.cs | Added overloads accepting responseMode parameter across all MapA2A extension methods |
dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs | Comprehensive test coverage for all three response modes, task lifecycle, continuation token handling, error scenarios, and cancellation |
Korolev Dmitry (DeagleGross)had a problem deploying
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Korolev Dmitry (DeagleGross)had a problem deploying
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Ashutosh Kumar Singh (Ashutosh0x) added a commit
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- Add Option 4: Use(...) middleware + HttpContext on additional properties (Javier's recommended approach) - Restructure Decision Outcome as phased approach: Phase 1: Expose HttpContext + document Use(...) pattern (minimal) Phase 2: Factory delegates + IAgentResolver (if demand warrants) - Add Maintainer Feedback section with Javier's direct quote - Expand consulted list: @DeagleGross, @ReubenBond, @rogerbarreto, @westey-m (as requested by @javiercn) - Add reference to DeagleGross's A2A hosting work (microsoft#3732) This revision prioritizes the approach Javier suggested: minimal framework changes using established ASP.NET Core patterns rather than introducing new abstractions.
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PR adds the support to A2A Tasks per protocol. As before it uses A2A SDK to subscribe to the events of receiving task/message updates and creation:
Task sessions are stored in the
AgentSessionStore, and continuation token for the task is stored in the session-metadata.Closes#406