C# / .NET News

This feed includes only recent releases, roughly from the last 12 months, not the full historical archive. That is why a long-established product may have only a few news items.

5 news

C# / .NET
Agent Framework at Build 2026: Agent Harness, CodeAct, hosted agents

Agent Harness automatically compacts chat history when the token limit is exceeded and includes built-in file, todo, and web-search providers. CodeAct (agent-framework-hyperlight) combines multiple tool calls into one program in an isolated micro-VM: 52.4% lower latency and 63.9% fewer tokens in test scenarios. Foundry Hosted Agents provide scale-to-zero deployment with file system persistence between sessions.

CodeAct replaces step-by-step tool calls with one program in a micro-VM — a different approach to saving tokens than n8n node-based workflows n8n →
C# / .NET
Microsoft Agent Framework 1.0 GA

AutoGen and Semantic Kernel merged into a unified SDK with stable APIs and long-term support. An MIT license, open source, and open weights are not required — the framework orchestrates any models: Foundry, Azure OpenAI, OpenAI, Anthropic Claude, Bedrock, Gemini, and Ollama. MCP and A2A support enables cross-platform agent interaction.

Native MCP protocol support for connecting agents with tools and other agents MCP →A graph engine for multi-agent workflows — a code-centric alternative to n8n low-code workflows n8n →
C# / .NET
.NET 11 Preview 1 released

The .NET 11 cycle begins: CoreCLR has been ported to WebAssembly, RISC-V and s390x support added, and the interpreter expanded. C# introduces Collection Expression Arguments. GA is planned for November 2026 (STS, not LTS).

C# / .NET
.NET 10 is generally available (LTS)

A release with three years of support through 2028-11-10. C# 14: field-backed properties and extension properties. AI features: Microsoft Agent Framework and unified Microsoft.Extensions.AI abstractions are built into the platform. EF Core adds vector search for SQL Server 2025 and full-text search for Cosmos DB.

Vector search is new in EF Core (.NET 10); Elasticsearch has supported dense_vector and ANN search since 2022 Elasticsearch →

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