Sandbox::https://github.com/microsoft/agent-framework/pull/2381

SergeyMenshykh · 2025-11-21T16:54:08Z

This PR adds support for AgentTask to the A2A agent and also includes support for background responses to the non-streaming RunAsync method, enabling consumers to poll for task completion.

The following items are out of scope for this PR and will be addressed separately in follow-up PRs:

Support for input requests from the A2A agent
Internal polling for agent task completion in the RunAsync method
Background responses for the streaming API: RunStreamingAsync

Contributes to: #95

Copilot

Pull request overview

This pull request adds support for AgentTask and background responses to the A2A agent, enabling consumers to poll for long-running task completion using continuation tokens.

Key changes:

Introduces A2AContinuationToken for tracking background task execution state
Updates A2AAgentThread to store both conversation context ID and task ID
Enhances A2AAgent.RunAsync to handle task responses and support polling via continuation tokens
Adds comprehensive unit tests for the new functionality
Includes a sample demonstrating polling for task completion

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs	Core implementation of task support, continuation token handling, and streaming task event processing
dotnet/src/Microsoft.Agents.AI.A2A/A2AContinuationToken.cs	New class implementing `ResponseContinuationToken` for task state tracking
dotnet/src/Microsoft.Agents.AI.A2A/A2AAgentThread.cs	Enhanced to store task ID alongside context ID with proper serialization
dotnet/src/Microsoft.Agents.AI.A2A/A2AJsonUtilities.cs	New utility class providing JSON serialization configuration for A2A types
dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AArtifactExtensions.cs	Refactored to extract `ToAIContents` method for better code reuse
dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AAgentTaskExtensions.cs	Enhanced with new `ToAIContents` method and nullable return types for better null handling
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/A2AAgentTests.cs	Extensive new tests covering continuation tokens, task responses, and streaming scenarios
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AArtifactExtensionsTests.cs	New unit tests for artifact extension methods
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AAgentTaskExtensionsTests.cs	New unit tests for agent task extension methods
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/A2AContinuationTokenTests.cs	New comprehensive tests for continuation token serialization and deserialization
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/A2AAgentThreadTests.cs	New tests for thread state serialization
dotnet/samples/GettingStarted/A2A/A2AAgent_PollingForTaskCompletion/Program.cs	New sample demonstrating polling for long-running task completion
dotnet/src/Microsoft.Agents.AI.A2A/Microsoft.Agents.AI.A2A.csproj	Removed version overrides for package references and added trim attributes configuration
dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Microsoft.Agents.AI.A2A.UnitTests.csproj	Removed version overrides and added NoWarn for MEAI001

…/SergeyMenshykh/agent-framework into a2a-support-background-responses

* add support for baackground responses to a2a agent * fix line endings * address pr review comments * address pr review comments * update sample to net10.0 * Update dotnet/samples/GettingStarted/A2A/A2AAgent_PollingForTaskCompletion/README.md Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> * Update dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AAgentTaskExtensions.cs Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> * Update dotnet/samples/GettingStarted/A2A/A2AAgent_PollingForTaskCompletion/Program.cs Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> * address pr review feedback * add clarification regarding background responses --------- Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com>

SergeyMenshykh added 2 commits November 21, 2025 16:41

add support for baackground responses to a2a agent

d151b9b

fix line endings

5e11c46

SergeyMenshykh self-assigned this Nov 21, 2025

SergeyMenshykh added this to Agent Framework Nov 21, 2025

Copilot AI review requested due to automatic review settings November 21, 2025 16:54

SergeyMenshykh added .NET Usage: [Issues, PRs], Target: .Net a2a Usage: [Issues, PRs], Target: A2A labels Nov 21, 2025

SergeyMenshykh moved this to In Review in Agent Framework Nov 21, 2025

Mark Wallace (markwallace-microsoft) added the documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs label Nov 21, 2025

Merge branch 'main' into a2a-support-background-responses

ae35d67

Copilot started reviewing on behalf of SergeyMenshykh November 21, 2025 16:54

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SergeyMenshykh mentioned this pull request Nov 21, 2025

Investigate support for long running Agent executions #95

Closed

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Copilot finished reviewing on behalf of SergeyMenshykh November 21, 2025 17:03

Copilot AI reviewed Nov 21, 2025

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SergeyMenshykh added 2 commits November 21, 2025 18:44

address pr review comments

2ca601c

Merge branch 'a2a-support-background-responses' of https://github.com…

ef8e2d8

…/SergeyMenshykh/agent-framework into a2a-support-background-responses

SergeyMenshykh temporarily deployed to integration November 21, 2025 18:45 — with GitHub Actions Inactive

SergeyMenshykh had a problem deploying to integration November 21, 2025 18:45 — with GitHub Actions Error

address pr review comments

d745349

SergeyMenshykh temporarily deployed to integration November 21, 2025 18:53 — with GitHub Actions Inactive

Merge branch 'main' into a2a-support-background-responses

4d0ba12

SergeyMenshykh had a problem deploying to integration November 24, 2025 10:57 — with GitHub Actions Failure

update sample to net10.0

a55b006

SergeyMenshykh had a problem deploying to integration November 24, 2025 12:30 — with GitHub Actions Error

Merge branch 'main' into a2a-support-background-responses

84c5188

dependabot Bot mentioned this pull request Jan 1, 2026

chore: Bump the production-dependencies group with 4 updates sterob-2/orchestrator#8

Merged

This was referenced Jan 12, 2026

deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#24

Closed

chore(nuget): Bump Microsoft.Agents.AI and 3 others mattdot/issueagent#61

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dependabot Bot mentioned this pull request Feb 2, 2026

deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#28

Closed

This was referenced Feb 2, 2026

chore(nuget): Bump Microsoft.Agents.AI and 3 others mattdot/issueagent#65

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deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#31

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dependabot Bot mentioned this pull request Feb 16, 2026

deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#34

Closed

This was referenced Feb 23, 2026

deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#39

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deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#42

Open

dependabot Bot mentioned this pull request Mar 16, 2026

deps(nuget): Bump Microsoft.Agents.AI.OpenAI from 1.0.0-preview.251001.2 to 1.0.0-rc4 PlagueHO/prompt-babbler#32

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dependabot Bot mentioned this pull request May 2, 2026

Bump the nuget-all group with 7 updates microsoft/Agents#546

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.NET: Add support for background responses to A2A agent - #2381

.NET: Add support for background responses to A2A agent#2381
SergeyMenshykh merged 17 commits into
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SergeyMenshykh:a2a-support-background-responses

SergeyMenshykh commented Nov 21, 2025 •

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Pull request overview

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SergeyMenshykh commented Nov 21, 2025 •

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