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.NET: Map additional props <-> A2A metadata - #3137
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Pull request overview
This PR implements bidirectional mapping of additional properties between the Agent Framework and A2A protocol metadata:
- Maps
AgentRunOptions.AdditionalPropertiestoA2A.MessageSendParams.Metadatawhen sending messages to A2A agents - Maps incoming
A2A.MessageSendParams.MetadatatoAgentRunOptions.AdditionalPropertiesin the A2A hosting layer - Maps
AgentRunResult.AdditionalPropertiestoA2AResponse.Metadatawhen returning responses from hosted agents
Key changes:
- Adds extension methods to convert between
AdditionalPropertiesDictionaryand A2A metadata format (Dictionary<string, JsonElement>) - Updates A2AAgent to propagate AdditionalProperties to/from A2A calls
- Updates AIAgentExtensions hosting layer to handle metadata bidirectionally
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI.A2A/Extensions/AdditionalPropertiesDictionaryExtensions.cs | New extension method to convert AdditionalPropertiesDictionary to A2A metadata format |
| dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AMetadataExtensions.cs | Adds documentation remarks to existing ToAdditionalProperties method |
| dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs | Updates RunCoreAsync and RunCoreStreamingAsync to propagate AdditionalProperties to/from A2A calls; simplifies Name and Description properties |
| dotnet/src/Microsoft.Agents.AI.Hosting.A2A/Converters/AdditionalPropertiesDictionaryExtensions.cs | New extension method to convert AdditionalPropertiesDictionary to A2A metadata format (duplicate of A2A project version) |
| dotnet/src/Microsoft.Agents.AI.Hosting.A2A/Converters/A2AMetadataExtensions.cs | New extension method to convert A2A metadata to AdditionalPropertiesDictionary (duplicate of A2A project version) |
| dotnet/src/Microsoft.Agents.AI.Hosting.A2A/AIAgentExtensions.cs | Updates MapA2A to convert incoming metadata to options and outgoing response properties to metadata |
| dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/AdditionalPropertiesDictionaryExtensionsTests.cs | Comprehensive unit tests for ToA2AMetadata extension method |
| dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/A2AAgentTests.cs | Tests for AdditionalProperties propagation in RunAsync and RunStreamingAsync |
| dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs | Tests for metadata/AdditionalProperties bidirectional conversion in hosting layer |
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Mark Wallace (markwallace-microsoft)
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…b.com/SergeyMenshykh/agent-framework into a2a-map-metadata-and-additional-props
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Motivation and Context
Currently, the AF A2A agent does not pass the additional properties from the agent run options down to the A2A agent. Moreover, the A2A hosting layer does not pass the metadata received in the A2A call to the run options of an underlying agent and does not return the additional properties returned by the underlying agent in the A2A call result. This prevents consumers from passing additional data from AF to A2A and back. More details can be found here: #2974
Description
This PR:
AgentRunOptions.AdditionalPropertiestoA2A.MessageSendParams.Metadata.NameandDescriptionproperties.A2A.MessageSendParams.MetadatatoAgentRunOptions.AdditionalProperties.AgentRunResult.AdditionalPropertiestoA2AResponse.