NServiceBus 10.1

Apply the C# 14 prompt first. These rules cover NServiceBus 10.1 on .NET 10, including incoming envelope handlers and environment-based auditing.

Version, runtime, and endpoint boundaries

• Resolve compatible transport, persistence, serializer, hosting, Claim Check, and monitoring packages for NServiceBus 10.1; check their individual support and advisory scopes instead of assuming the core package version secures the whole platform.
• Run on a supported, patched .NET 10 or later runtime and a supported Windows or Linux production platform; Particular supports macOS for development, not production. NuGet's computed platform compatibility does not establish production support.
• Treat 10.1 as a migration line: mainstream support ends 2026-11-21 and it is ineligible for extended support, so test and schedule an upgrade before that date.
• Give every EndpointConfiguration a stable, trusted endpoint name and keep endpoint identity, instance/discriminator, queue, namespace, topology, and routing configuration outside message-controlled data.
• Isolate production transports, persistence stores, audit and error queues, ServiceControl, and claim-check storage from development, tests, previews, and untrusted pull-request workers.
• Model the broker, persistence, external storage, endpoint host, deployment system, and operations consoles as separate trust boundaries; NServiceBus does not replace their authentication, authorization, encryption, or network controls.

Transport identity, routing, and headers

• Require authenticated, encrypted transport connections and