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ASP.NET Core 11 emits openapi 3.2.0 by default and Swagger UI below 10.1.5 rejects it. Upgrade Swashbuckle.AspNetCore.SwaggerUI, or pin OpenApiVersion back to OpenApi3_1.

Since August 3, 2026 you can pick a reasoning level next to the model when you start a Copilot cloud agent task. The Agent Tasks REST API has no equivalent parameter, so scripted dispatch cannot set it. Here is where the control exists, which levels each model exposes, what lands on the wire, and how to pin a default instead.

Semantic Kernel .NET 1.80.0 ships a breaking change: the OpenAPI plugin's default HttpClient no longer follows redirects, closing an SSRF bypass. Here is what changes and why your own HttpClient reopens the hole.

Claude Code and GitHub Copilot both ship allowedMcpServers and deniedMcpServers, but the matchers behave differently. serverName is a fallback that a single serverCommand entry silently disables, deny is a union while allow is not, and an invalid allowlist locks everything out.

CA1873 fires on the implicit params object[] allocation, so almost every LogDebug call trips it. Fix it with [LoggerMessage] or an IsEnabled guard.

AutoMapper 15 removed the single-argument MapperConfiguration constructor. Pass an ILoggerFactory as the second argument, and add a config action to every AddAutoMapper call.

CS0121 after moving an extension method into a C# 14 extension block: the compiler still emits the old static form. Delete the duplicate or qualify the call.

Preview 7 flips MSBuild server from opt-in to on by default, so back-to-back dotnet build and dotnet test calls reuse a warm worker process. Here is what changed, how to opt out, and how to prove the server actually engaged.

Move a key off IDENTITY and onto a SQL Server sequence in EF Core 11 with UseSequence: the exact SQL EF emits, why explicit key values suddenly work without IDENTITY_INSERT, the bigint sequence feeding an int column, and the gaps you have to design around.

A complete guide to redacting classified data in source-generated logs: build a taxonomy, write a Redactor, wire EnableRedaction and AddRedaction, and understand the discriminator that silently breaks partial masking. With real output from Microsoft.Extensions.Compliance.Redaction 10.9.0.