microsoft-extensions

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npx skills add https://github.com/managedcode/dotnet-skills --skill microsoft-extensions

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wiring dependency injection, configuration, logging, or options
introducing Generic Host patterns into non-web .NET apps
cleaning up service registration, typed HTTP clients, or shared infrastructure code

Prefer the Generic Host for apps that need configuration, DI, logging, hosted services, or coordinated startup.
Keep service registration predictable: composition at the edge, concrete implementations hidden behind interfaces only where that abstraction buys flexibility.
Use options binding for structured configuration and validate configuration at startup when bad settings would fail later at runtime.
Prefer IHttpClientFactory and typed or named clients for outbound HTTP instead of ad-hoc singleton or per-call HttpClient usage.
Use logging categories and config-driven log levels rather than scattered ad-hoc logging behavior.
For Kubernetes-hosted services, prefer the stable Microsoft.Extensions.Diagnostics.ResourceMonitoring.Kubernetes package from the 10.7+ line when CPU/memory request and limit metrics should come from pod resource quotas.
Avoid building mini-frameworks over Microsoft.Extensions unless the repo genuinely needs reusable composition primitives.

dotnet/extensions v10.9.0 adds experimental AI routing and failover clients and includes HTTP diagnostics/source-logging fixes. Generic Host, dependency injection, configuration, logging, options, and IHttpClientFactory patterns remain unchanged; route AI-specific architecture to microsoft-extensions-ai.
The MCP server project template moved out of dotnet/extensions and into the ASP.NET Core/.NET SDK distribution. Update scaffolding automation to use the SDK-provided template instead of pinning the removed extensions template package.
If repository automation creates AI templates from the prior v10.8.4 change, pass --provider azureopenai, --provider ollama, or --provider openai explicitly and validate the selected provider's secrets and local-development path.
Keep Microsoft.Extensions package versions aligned within the repo's selected servicing line, then rerun host startup and options-validation tests after upgrading.

service lifetimes are correct
configuration is strongly typed where it matters
host setup remains easy to debug and reason about
Kubernetes resource monitoring uses the stable quota-provider APIs when pod request/limit dimensions matter

patterns.md - DI patterns, Configuration patterns, Options pattern, Logging patterns, HttpClientFactory patterns, Hosted Service patterns
anti-patterns.md - Common mistakes with DI, configuration, options, logging, HttpClient, and hosted services