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.NET Codex Instructions: Nullable Contracts, Async and Endpoints

Codex instructions for .NET: Nullable Contracts, Async and Endpoints. Append to AGENTS.md. Structure, security, and tests. .NET 10 LTS and .NET 11, Nov 2026.

# .NET Codex Instructions: Nullable Contracts, Async and Endpoints ## Install Install the native export at `AGENTS.md` as an appended section, not a replacement and not a custom agent. Copy that export, not this catalog file. Catalog fields such as `tools` and `author` are for presets.dev. Install one skill file per name. Cursor, GitHub Copilot, Codex, Antigravity CLI, and Devin can all read `.agents/skills`, so a second copy with the same name collides. <!-- native:start --> # .NET Codex Instructions: Nullable Contracts, Async and Endpoints Section to append to `AGENTS.md` for .NET. This is project guidance, not a custom agent. ## Updated for .NET 10 LTS and .NET 11, Nov 2026 Do not upgrade dependencies or the framework version unless the task asks. .NET 11 includes C# 15 unions an...