Daily DevOps & .NET - Where Code Meets Culture

Opinionated .NET, Azure and DevOps engineering. Hard-won lessons from production, no tutorials.

Building an MCP Server in .NET Without Buying the Hype

Published on 6/30/26 8:45 pm by Martin Stühmer

MCP is JSON-RPC with conventions, not magic. This guide builds a Model Context Protocol server in .NET with the official SDK: stdio and Streamable HTTP transports, tightly-scoped typed tools, JWT authentication, prompt-injection defenses, OpenTelemetry tracing, and the production failure modes the demos never mention.

Structured Logging Patterns That Actually Survive Production

Published on 6/25/26 5:00 pm by Martin Stühmer

Every pattern here addresses a failure mode I have either shipped or inherited. Source generators on hot paths, scope opt-in per provider, end-to-end correlation ID propagation, log levels as an ops contract, sink selection as an architecture decision, and OpenTelemetry Logs for greenfield services: six concrete changes that make structured logging trustworthy in production.

TimeProvider Test Patterns That Hold Up in CI and Production

Published on 6/23/26 5:00 pm by Martin Stühmer

FakeTimeProvider gives you a clock you control. That solves the easy 30%. The hard part is everything that interacts with that clock: async callbacks, PeriodicTimer, CancellationTokenSource.CancelAfter, BackgroundService loops, and DI lifetime traps that turn deterministic bugs into apparently flaky tests.

Standardize or Drift: One Defaults Package for All Your Solutions

Published on 6/19/26 8:45 am by Martin Stühmer

Directory.Build.props drift is the quiet tax every multi-repo .NET org pays. NetEvolve.Defaults ships MSBuild properties, .editorconfig, NuGet Audit, and ten Roslyn diagnostics as a private-asset NuGet package. Bump the version once, every repo gets the upgrade.

.NET 11: The STS Release With C# 15 Union Types and Runtime-Async

Published on 6/16/26 5:00 pm by Martin Stühmer

STS releases are supposed to be quiet bridges to the next LTS. .NET 11 is not. The union keyword landed in Preview 2, runtime-async is now the default for the BCL and ASP.NET Core shared framework, System.Diagnostics.Process ships a major overhaul, and EF Core gains approximate vector search against SQL Server 2025. All facts sourced from the .NET repositories.