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In ASP.NET Core 11, return Results<T1, TN> with TypedResults for minimal APIs and ActionResult<T> for controllers. Treat bare IResult and bare IActionResult as escape hatches: they compile for any response but describe nothing to OpenAPI, so you pay for them in hand-written ProducesResponseType attributes.

Use CreateBuilder for a normal app, CreateSlimBuilder when you publish trimmed or Native AOT behind a TLS proxy, and CreateEmptyBuilder only when you want to register every service yourself. Here is the feature matrix and the gotchas that force the call.

Version 2.1.213 caps concurrent subagents and stops nested spawns by default, building on the per-session limits from 2.1.212. Here are the new defaults and env vars.

On EF Core 11, default to complex types for value objects and drop to owned entities only when you need a separate table or a collection mapped to its own rows.

Claude Code compacts, then a single oversized file read or tool result immediately refills the window and it compacts again. Drop the item with /clear, read files in slices, and force big output to disk.

Output caching is the right default for almost every server-side app in ASP.NET Core 11. Response caching only wins when your goal is to steer browser and proxy caches through HTTP headers. Here is the decision, with a feature matrix and the gotchas that force the call.

On EF Core 11, default to TPH for almost every hierarchy, reach for TPC only when you mostly query one leaf type and a benchmark proves it wins, and use TPT only when an external constraint forces you to.

Sequential for pipelines, concurrent for fan-out, group chat for moderated rounds, handoff for routing, magentic for open-ended planning. The C# builders and how to choose.

CS4014 means you called a Task-returning method without awaiting it. Add await, or discard with _ = if fire-and-forget is truly intended, and handle exceptions.

This exception means you called .First() or .Single() on an empty sequence. Use FirstOrDefault/SingleOrDefault and null-check, or guard the query, or fix why the source is empty.