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api-versioning

API versioning strategies for ASP.NET Core. Covers Asp.Versioning library, URL segment, header, and query string strategies, version deprecation, and OpenAPI integration. Load this skill when adding versioning to an API, evolving an API with breaking changes, or when the user mentions "API version", "versioning", "v1/v2", "Asp.Versioning", "deprecation", "breaking change", or "backward compatibility".

skills/api-versioning/SKILL.md

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# API Versioning

## Core Principles

1. **Version from day one** — Adding versioning later is painful. Start with a version in the URL even if you only have v1.
2. **URL segment versioning is the default** — `/api/v1/orders` is the most discoverable and cache-friendly strategy.
3. **Never break existing versions** — Add a new version for breaking changes. Deprecate the old version with a timeline.
4. **Version the API, not individual endpoints** — All endpoints in a version group share the same version number.

## Patterns

### Setup with Asp.Versioning

```csharp