dotnet-1.19.0

What's Changed

• .NET: Add session-persisted chat client routing by westey (@westey-m) in #7641
• .NET: Fix snake_case argument names in Harness file tool descriptions by westey (@westey-m) with @Copilot in #7731
• .NET: Pass IServiceProvider to ChatClientAgent in AddAIAgent overloads by westey (@westey-m) in #7737
• .NET: Python: Clarify PR review comment resolution by Evan Mattson (@moonbox3) in #7746
• .NET: Update AG-UI samples for latest MAF + AG-UI SDK and align with docs by Daniel Roth (@danroth27) in #7295
• .NET: Migrate remaining Foundry hosted samples to source deployment by Roger Barreto (@rogerbarreto) in #7668
• .NET: agent-hooks interception contract as a first-class experimental feature by MohammadHaroonAbuomar in #7564
• .NET: Forward AG-UI context and additional properties by Javier Calvarro Nelson (@javiercn) in #7742
• .NET: Suppress Swagger UI CodeQL alert in AgentWebChat sample by SergeyMenshykh in #7764
• .NET: Remove AGUI history special cases from ChatClientAgent by Javier Calvarro Nelson (@javiercn) in #7741
• .NET: Fix A2A streaming artifact updates by SergeyMenshykh in #7722
• Python: Harness blog part4 samples by westey (@westey-m) in #7698
• .NET: Clarify compaction provider and chat reducer choices by Ravi Kiran Pagidi (@ravikiranpagidi) in #7678
• .NET: Add Azure Blob Storage session persistence by Korolev Dmitry (@DeagleGross) in #1893
• .NET: Persist hosted agent state in Foundry by Roger Barreto (@rogerbarreto) in #7649
• .NET: [BREAKING] Migrate MCP long-running task support to the 2026-07-28 Tasks extension by Peter Ibekwe (@peibekwe) in #7774
• .NET: Add feature-usage bitmask by Peter Ibekwe (@peibekwe) in #7709
• Bump Anthropic from 12.35.1 to 12.42.0 by Dependabot (@dependabot)[bot] in #7778
• .NET: Fix ReasoningSummary passthrough in GitHub Copilot resume config by Chandramouleswaran (@chandramouleswaran) in #6441
• .NET: Bump AgentMemory from 1.3.0 to 1.4.1 by Dependabot (@dependabot)[bot] in #7639
• .NET: Add support for Resilient long-running and Steerable Foundry Hosted Agents by Roger Barreto (@rogerbarreto) in #7370
• .NET: Update version for 1.19.0 release by Roger Barreto (@rogerbarreto) in #7814

New Contributors

• Daniel Roth (@danroth27) made their first contribution in #7295
• Manjunath Janardhan (@manjunathshiva) made their first contribution in #7755
• ALEX LILUZ (@alexliluz) made their first contribution in #7766
• Dan Fiedler (@danfiedler-msft) made their first contribution in #7768
• Ravi Kiran Pagidi (@ravikiranpagidi) made their first contribution in #7678
• Sadok Barbouche (@cr-sbarbouche) made their first contribution in #7734
• Ran Shemtov (@ranst91) made their first contribution in #7423
• Quim Muntal (@qmuntal) made their first contribution in #7754

Full Changelog: dotnet-1.18.0...dotnet-1.19.0