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migrate-nullable-references

Enable nullable reference types in a C# project and systematically resolve all warnings. USE FOR: adopting NRTs in existing codebases, file-by-file or project-wide migration, fixing CS8602/CS8618/CS86xx warnings, annotating APIs for nullability, cleaning up null-forgiving operators, upgrading dependencies with new nullable annotations. DO NOT USE FOR: projects already fully migrated with zero warnings (unless auditing suppressions), fixing a handful of nullable warnings in code that already has NRTs enabled, suppressing warnings without fixing them, C# 7.3 or earlier projects. INVOKES: Get-NullableReadiness.ps1 scanner script.

plugins/dotnet-upgrade/skills/migrate-nullable-references/SKILL.md

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# Nullable Reference Migration

Enable C# nullable reference types (NRTs) in an existing codebase and systematically resolve all warnings. The outcome is a project (or solution) with `<Nullable>enable</Nullable>`, zero nullable warnings, and accurately annotated public API surfaces — giving both the compiler and consumers reliable nullability information.

## When to Use

- Enabling nullable reference types in an existing C# project or solution
- Systematically resolving CS86xx nullable warnings after enabling the feature
- Annotating a library's public API surface so consumers get accurate nullability information
- Upgrading a dependency that has added nullable annotations and new warnings appear
- Analyzing suppressions in a code base that has already enabled NRTs to determine whether they can be removed

## When Not to Use