Guides writing and reviewing System.Net networking code in dotnet/runtime.
npx skills add https://github.com/dotnet/runtime --skill system-net-review
Please help me install this Agent Skill. Skill: system-net-review Source: https://github.com/dotnet/runtime/tree/main/.github/skills/system-net-review Command: npx skills add https://github.com/dotnet/runtime --skill system-net-review
Writing or modifying System.Net networking code in dotnet/runtime requires deep knowledge of resource lifecycle, connection pooling, cross-platform interop, protocol compliance, async patterns, and security defaults, and mistakes in these areas cause leaks, protocol violations, or security regressions.
Ask the assistant to review or help write System.Net networking code, such as "review my changes to SslStream certificate validation using the system-net-review guidance."
High-intent search queries and answers about installing and using this skill.
Use ValueTask<T> when synchronous completion is common, always apply ConfigureAwait(false) in library code, and accept a CancellationToken linked with internal timeout tokens. Never await inside a lock; use SemaphoreSlim for async mutual exclusion instead.
Validate connection state before returning it to the pool and dispose connections with unread data or protocol errors. Never hold locks while awaiting I/O, prefer Interlocked for hot-path counters, and ensure pool disposal drains all waiters and closes connections.
Use [LibraryImport] rather than [DllImport], place declarations under Common/src/Interop/<platform>/, and wrap native handles in SafeHandle subclasses. Use Utf8 string marshalling on Unix and Utf16 on Windows, and verify struct layouts across x86, x64, and arm64.
No, functional tests use in-process loopback servers such as LoopbackServer for HTTP/1.1, Http2LoopbackServer, Http3LoopbackServer, and LoopbackProxyServer. Platform-specific tests use ConditionalFact or ConditionalTheory with PlatformDetection.
Set EnabledSslProtocols to SslProtocols.None so the OS negotiates the best protocol, and never hardcode TLS 1.0 or 1.1. The default certificate validation callback must reject invalid certificates, and credentials must never be logged or cached beyond the session.
s205109Verify .NET solution builds, tests, formatting, and git status before commits.
awfixers-stuffCheck out a pull request branch, apply reviewer feedback, and push changes.
dotnetReview dotnet/runtime code changes for correctness, performance, and conventions.
dotnetMigrate .NET 10 projects to .NET 11 by updating target frameworks and resolving breaking changes.
