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Microsoft Agent Framework .NET 1.21.0 tracks A2A task state and breaks the file-access line-numbering contract
dotnet-1.21.0 (2026-09-11) adds tracking and updating of A2A task state and a second breaking change clarifying A2A agent run modes, which matters for anyone wiring the framework to other vendors' agents over A2A. The other breaking change adds file_access_read_lines and moves the line-numbering contract onto AgentFileStore. Dependency work removes the Azure.AI.OpenAI dependency outright and swaps the deprecated AWSSDK.Extensions.Bedrock.MEAI for AWS.Bedrock.MEAI, continuing the pattern of the framework shedding vendor-specific SDK coupling.
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