.NET: Forward A2A MessageSendParams.Configuration in the A2A adapter - #7365
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The A2A hosting layer now forwards the caller-supplied SendMessageConfiguration from RequestContext.Configuration into AgentRunOptions.AdditionalProperties under the key 'a2a.configuration'. This covers all three handler paths: non-streaming, streaming, and task continuation. The server-configured AgentRunMode remains authoritative for AllowBackgroundResponses — the caller's ReturnImmediately is forwarded but does not override the server decision. Closes microsoft#5869 Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 5ee820de-3e34-493b-a19c-1db6bc04871d
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Pull request overview
This PR updates the .NET A2A hosting adapter to forward the caller-provided MessageSendParams.Configuration (SendMessageConfiguration) into AgentRunOptions.AdditionalProperties so hosted agents can observe request configuration through the normal RunAsync/RunStreamingAsync options path.
Changes:
- Refactors A2A option construction into a single
CreateRunOptionshelper used by non-streaming, streaming, and continuation paths. - Forwards the full
SendMessageConfigurationobject under the"a2a.configuration"key inAgentRunOptions.AdditionalProperties. - Adds unit tests verifying configuration forwarding (including in streaming mode) and ensuring server run mode remains authoritative for background execution.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AAgentHandler.cs | Centralizes AgentRunOptions creation and forwards SendMessageConfiguration via AdditionalProperties. |
| dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/A2AAgentHandlerTests.cs | Adds coverage for configuration forwarding and run-mode authority behavior. |
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This was referenced Jul 30, 2026
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Motivation & Context
RequestContext.Configuration(SendMessageConfiguration) is never read by the A2A hosting layer, so agent authors cannot see the caller'sacceptedOutputModes,historyLength, etc. throughAgentRunOptions.Description & Review Guide
A2AAgentHandlernow stores the wholeSendMessageConfigurationinAdditionalProperties["a2a.configuration"]via a sharedCreateRunOptionshelper used by all three handler paths.AgentRunModestays authoritative forAllowBackgroundResponses.Related Issue
Closes #5869
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