# Add Refactoring

> Use when adding a new RR#### refactoring in roslynator, editing Refactorings.xml, registering in RefactoringContext, or when refactorings-testing.md shows XunitRefactoringVerifier — in-repo uses AbstractCSharpRefactoringVerifier and CHANGELOG.md.

- Skill: `dotnet/add-refactoring` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add dotnet/add-refactoring`
- Raw SKILL.md: https://api.skillmd.com/api/skills/dotnet/add-refactoring/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: .NET (Microsoft) (https://skillmd.com/u/dotnet)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/dotnet/add-refactoring

---


# Add Refactoring

## Overview

Refactorings are metadata-driven: `Refactorings.xml` → codegen → register in `RefactoringContext` → implement → test → changelog.

## When to Use

- New `RR####` refactoring in an approved issue
- Registering a refactoring action on a syntax kind
- `<OptionKey>` required on every refactoring entry

**Not for:** analyzers (`add-analyzer`), compiler fixes (`add-compiler-diagnostic-fix`), deprecation (`deprecate-analyzer-or-refactoring`).

**Gate:** approved GitHub issue (CONTRIBUTING.md).

Read [references/implementation.md](references/implementation.md) before writing tests — public [refactorings-testing.md](https://josefpihrt.github.io/docs/roslynator/refactorings-testing) uses `XunitRefactoringVerifier`, which does not match in-repo tests.

## Confirm metadata parameters (hard gate)

**STOP. Do NOT edit `Refactorings.xml`, run codegen, or implement until the user has confirmed every required parameter below.** Do not invent values the user (or issue) did not state.

Use `AskQuestion` when available; otherwise ask conversationally. Batch related choices.

| Parameter | Required? | Notes |
|-----------|-----------|--------|
| `Id` | propose | Compute next free `RR####` from `Refactorings.xml`; **do not ask** unless the issue conflicts or multiple ids are plausible |
| `Identifier` | yes | PascalCase; drives generated names |
| `Title` | yes | Short description (light-bulb text) |
| `OptionKey` | yes | EditorConfig key segment → `roslynator_refactoring.<key>.enabled` |
| `Syntaxes` / `Span` | yes for docs | Where it can be invoked (documentation only; registration is in code) |
| `Summary` / samples | recommended | Confirm if not in the issue |

When proposing `Id`, state the chosen value in your plan/summary (e.g. “using next free **RR0218**”). Skip asking other parameters only when the approved issue or the user's message already states the value explicitly.

## Quick Reference

| Step | Location / command |
|------|-------------------|
| Metadata | `src/Refactorings.xml` |
| Codegen | `cd tools && pwsh ./generate_code.ps1` |
| Register | `RefactoringContext.cs` or helper under `Refactorings/CSharp/Refactorings/` |
| Implement | same folder |
| Tests | `src/Tests/Refactorings.Tests/RR####IdentifierTests.cs` |
| Changelog | `CHANGELOG.md` under `## [Unreleased]` |

## Implementation

1. Confirm metadata parameters (hard gate above).
2. Details and examples: [references/implementation.md](references/implementation.md).

Changelog:

```markdown
- Add refactoring "TITLE" ([RR####](https://josefpihrt.github.io/docs/roslynator/refactorings/RR####)) ([#PR](https://github.com/dotnet/roslynator/pull/PR))
```

Verify:

```bash
cd tools && pwsh ./generate_code.ps1
cd src && dotnet build Roslynator.sln
cd src && dotnet test Tests/Refactorings.Tests --no-build --filter "FullyQualifiedName~RR####"
cd src && dotnet format Roslynator.sln --no-restore --verify-no-changes --severity info
```

## Common Mistakes

| Mistake | Fix |
|---------|-----|
| Guess `Title` / `OptionKey` / `Identifier` | Ask — hard gate above |
| Follow `refactorings-testing.md` verbatim | In-repo: `AbstractCSharpRefactoringVerifier` + `RefactoringId` override |
| Missing `<OptionKey>` | Required — EditorConfig id for enable/disable |
| Codegen from repo root | `cd tools && pwsh ./generate_code.ps1` |
| `[|...|]` for diagnostics | Selection span for refactorings |
| Only `<Syntaxes>` / `<Span>` | Documentation-only; registration is in code |