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A step-by-step checklist for moving an existing LangChain agent off inline @tool functions onto a standalone MCP server that any client can call. Covers extracting tools into FastMCP, re-wiring the agent with langchain-mcp-adapters MultiServerMCPClient, the sync-to-async switch, transports, and the gotchas that bite mid-cutover.

GitHub Copilot's modernize-dotnet agent shipped as a portable plugin on July 9, 2026. It now runs in VS Code, the Copilot CLI, and on GitHub, with an assess to plan to execute workflow whose artifacts get committed to your repo for review.

dotnet build compiles your project for the inner development loop and defaults to Debug. dotnet publish runs the MSBuild Publish target, defaults to Release on net8.0 and later, and packages a deployable folder with web assets, self-contained runtimes, single-file, trimming, and AOT handled. Here is exactly what each one produces and when to reach for it.

dotnet run builds your project once and launches it. dotnet watch wraps dotnet run in a file watcher: it relaunches or hot reloads the app every time you save a source file. Here is exactly what each one does, what dotnet watch sets that dotnet run does not, and when to reach for which.

IHostedService is the two-method interface (StartAsync/StopAsync) the .NET generic host calls on startup and graceful shutdown. Here is exactly what the contract promises, when to implement it directly, and the .NET 10 and 11 behavior changes that catch people out.

A step-by-step migration guide for replacing hand-rolled if-checks in ASP.NET Core 11 minimal API handlers with the built-in source-generated DataAnnotations validator: what breaks, which manual rules do and do not port, and how to verify the 400 ProblemDetails contract stays identical.

A step-by-step checklist for moving a .NET app off the raw OpenAI 2.12 SDK onto the provider-neutral Microsoft.Extensions.AI 10.7 IChatClient. Covers the AsIChatClient bridge, the CompleteChatAsync-to-GetResponseAsync rewrite, streaming, tool calling, DI registration, and the gotchas that bite mid-cutover.

A step-by-step upgrade from flutter_riverpod 2.x to 3.x: bump the packages, move StateProvider and friends to the legacy import, drop the AutoDispose and Family ref types, handle ProviderException wrapping and automatic retry, and fix the == notification filtering that silently drops StreamProvider events. Tested on Flutter 3.44, Dart 3.x, flutter_riverpod 3.3.2.

VS Code 1.128 (July 8, 2026) lets one Claude agent-host session hold several parallel chats, each with its own history, title, and model. Here is what chat.agentHost.enabled actually unlocks and how the quick-chat and BYOK pieces fit.

Trim-safe code is code the .NET trimmer can statically prove is reachable, so it survives when unused code is removed from a self-contained app. This is the practical guide: turn on the analyzer, drive every IL2xxx warning to zero, annotate reflection with DynamicallyAccessedMembers, propagate RequiresUnreferencedCode to public APIs, and replace unanalyzable patterns with source generators.