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<!-- Pi platform guidance -->
<!-- Use installed tool names. Discover callable tools before batching independent calls in codemode; model-only UI/orchestration tools must be called directly. -->
<!-- Read required skill/instruction files through direct read when exposed or through Code Mode. If an optional pruning extension is installed, verify its output protection semantics; do not assume nested-path protection. Code Mode composes calls; subagents or controllers own durable workflows. Async subagents notify natively: yield rather than poll. -->


# C# /.NET Development

Check the nearest `*.csproj`, `Directory.Build.props`, `global.json`, and CI for `TargetFramework(s)`, `LangVersion`, nullable context, and analyzer policy before using newer syntax. Without an explicit `LangVersion`, the C# version follows the TFM (`net8.0` defaults to C# 12; `net6.0` defaults to C# 10, which lacks primary constructors and collection expressions). Project conventions win over these defaults, and raising `LangVersion` or the TFM to unlock syntax is a separate decision — ask first, don't do it on your own.

## Defaults

- BCL and existing NuGet packages first. Keep the app's existing choices: controllers vs minimal APIs, DI container, ORM, test framework.
- Nullable reference types stay on. Model absence with `?`; handle a missing result explicitly (e.g. return `NotFound`/`Problem`) instead of `!`. Never suppress a warning; fix it at the source.
- Async end to end: no `.Result`, `.Wait()`, or `GetAwaiter().GetResult()`. Pass `CancellationToken` through cancellable boundaries, including EF calls.
- Never let a singleton capture a scoped service (e.g. a `DbContext`); use `IServiceScopeFactory` or `IDbContextFactory` when a singleton needs scoped data.