1 Commits

• .NET: [Breaking] Migrate A2A agent and hosting to A2A SDK v1 (#5423)

  * update a2a agent to the latest a2a sdk (#5257)
  
  * Move A2A samples from 04-hosting to 02-agents (#5267)
  
  Move the A2A sample projects (A2AAgent_AsFunctionTools and
  A2AAgent_PollingForTaskCompletion) from samples/04-hosting/A2A/ to
  samples/02-agents/A2A/ to better align with the sample directory
  structure. Update solution file and samples README accordingly.
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * .NET: Fix stream reconnection for A2AAgent (#5275)
  
  * Add SSE stream reconnection support to A2AAgent
  
  Implement automatic reconnection for SSE streams that disconnect mid-task,
  using the Last-Event-ID header to resume from where the stream left off.
  
  Changes:
  - Add InvokeStreamingWithReconnectAsync method to A2AAgent with configurable
    max retries and delay between attempts
  - Add new log messages for reconnection events
  - Add A2AAgent_StreamReconnection sample demonstrating the feature
  - Update existing polling sample to use simplified SendMessageAsync API
  - Add unit tests for stream reconnection logic
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * address comments
  
  * Address PR review feedback
  
  - Dispose SSE enumerator before GetTaskAsync fallback to release HTTP connection
  - Wrap StreamWriter in using blocks with leaveOpen:true and explicit UTF-8 encoding
  - Print update.Text instead of update object in stream reconnection sample
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  ---------
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * .NET: Use IA2AClientFactory to create A2AClient (#5277)
  
  * Refactor A2A extensions to use IA2AClientFactory and add ProtocolSelection sample
  
  - Update A2AAgentCardExtensions to accept IA2AClientFactory instead of A2AClientOptions
  - Update A2ACardResolverExtensions to accept IA2AClientFactory
  - Update A2AClientExtensions to accept IA2AClientFactory
  - Update A2AAgent to use IA2AClientFactory for client creation
  - Add A2AAgent_ProtocolSelection sample demonstrating protocol selection
  - Add comprehensive unit tests for all changes
  - Update README files with new sample reference
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * Reorder params: options before loggerFactory in A2A extensions
  
  Move A2AClientOptions parameter before ILoggerFactory in AsAIAgent
  and GetAIAgentAsync extension methods to follow the repo convention
  of keeping LoggerFactory and CancellationToken as the last parameters.
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  ---------
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * .NET: Migrate A2A hosting to A2A SDK v1 (#5363)
  
  * .NET: Migrate A2A hosting to A2A SDK v1
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * remove unused agent card
  
  ---------
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * .NET: Split A2A endpoint mapping into protocol-specific methods (#5413)
  
  * .NET: Refactor A2A hosting registration into A2AServerServiceCollectionExtensions
  
  - Rename A2AHostingOptions to A2AServerRegistrationOptions
  - Move server registration logic from A2AEndpointRouteBuilderExtensions
    and AIAgentExtensions into new A2AServerServiceCollectionExtensions
  - Remove A2AProtocolBinding and AIAgentExtensions (consolidated)
  - Update samples and tests to use the new registration API
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * address copilot comments
  
  ---------
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * Remove unnecessary using directive in AgentWebChat.AgentHost
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  * restore AsyncEnumerable package version
  
  * address copilot initial feedback
  
  * address automated code review and formatting issues
  
  * fix formatting issues
  
  * Add DI wiring verification tests for AddA2AServer
  
  Add three tests to A2AServerServiceCollectionExtensionsTests that verify
  custom keyed services are actually wired through to the A2AServer, not
  just that the server resolves non-null:
  
  - Custom IAgentHandler: verifies the keyed handler is invoked when
    processing a SendMessageRequest instead of the default A2AAgentHandler.
  - Custom AgentSessionStore (no handler): verifies the keyed session
    store's GetSessionAsync is called during request processing when no
    custom handler is registered.
  - Default stores end-to-end: verifies the InMemoryAgentSessionStore and
    InMemoryTaskStore defaults successfully process a request. Uses a new
    CreateAgentMockForRequests helper that includes SerializeSessionCoreAsync
    setup needed by InMemoryAgentSessionStore.
  
  All tests call A2AServer.SendMessageAsync directly (no HTTP layer needed)
  and use CancellationToken timeouts to guard against hangs.
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
  
  ---------
  
  Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

  SergeyMenshykh · 2026-04-23 07:53:00 +00:00
  66e02c10e3