Add Compiler Diagnostic Fix

OrganizationPopular

dotnet

add-compiler-diagnostic-fix

Use when adding a Roslynator code fix for C# compiler error CS#### or RCF####, editing Diagnostics.xml or CodeFixes.xml, or when compiler-diagnostic-fixes-testing.md shows XunitCompilerDiagnosticFixVerifier or bare DiagnosticId like "CS0106" — in-repo uses AbstractCSharpCompilerDiagnosticFixVerifier and CompilerDiagnosticIdentifiers. Contributor how-to exists but testing page targets NuGet consumers.

Overview

Publisher	dotnet
Repository	`roslynator`
Skill name	`add-compiler-diagnostic-fix`
Stars	3.5K
Forks	297
Bundled files	1
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
1 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by dotnet on GitHub. Read the source before you install it.

Installation

Install the Add Compiler Diagnostic Fix AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/dotnet/roslynator/tree/main/.claude/skills/add-compiler-diagnostic-fix
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/dotnet/roslynator/tree/main/.claude/skills/add-compiler-diagnostic-fix

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/dotnet/roslynator.git /tmp/roslynator
mkdir -p .claude/skills
cp -r /tmp/roslynator/.claude/skills/add-compiler-diagnostic-fix .claude/skills/add-compiler-diagnostic-fix

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Add Compiler Diagnostic Fix in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Add Compiler Diagnostic Fix on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Add Compiler Diagnostic Fix is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Add Compiler Diagnostic Fix

Overview

Compiler fixes use Diagnostics.xml + CodeFixes.xml → codegen → CompilerDiagnosticCodeFixProvider → test. Contributor how-to: how-to-add-compiler-diagnostic-fix. Do not follow compiler-diagnostic-fixes-testing alone — it targets NuGet consumers.

When to Use

New fix for CS#### compiler diagnostic
New RCF#### entry linking one or more CS ids
Extending fix coverage for an existing compiler error

Not for: Roslynator analyzers (add-analyzer), refactorings (add-refactoring).

Gate: approved GitHub issue (CONTRIBUTING.md).

Read references/implementation.md before writing tests.

Confirm metadata parameters (hard gate)

STOP. Do NOT edit Diagnostics.xml / CodeFixes.xml, run codegen, or implement until the user has confirmed every required parameter below. Do not invent titles or identifiers when the user (or issue) did not state them.

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

Parameter	Required?	Notes
Compiler `CS####` id(s)	yes	One RCF may fix multiple CS ids
New `Diagnostics.xml` entry?	if CS not already cataloged	Confirm `Title` / `Message` / `HelpUrl` (usually from Microsoft docs)
`RCF` `Id`	propose	Compute next free `RCF####` from `CodeFixes.xml`, or extend an existing RCF when appropriate; do not ask unless ambiguous
`Identifier`	yes	PascalCase for the code fix
`Title`	yes	Code-fix menu / docs title
Code action title	yes	String passed to `CodeAction.Create` (may match or differ from XML Title)

When proposing RCF Id, state the chosen value in your plan/summary (e.g. “using next free RCF0121”). Skip asking other parameters only when the approved issue or the user's message already states the value explicitly.

Quick Reference

Step	Location
Diagnostic catalog	`src/Diagnostics.xml`
Fix metadata	`src/CodeFixes.xml`
Codegen	`cd tools && pwsh ./generate_code.ps1`
Provider	`src/CodeFixes/CSharp/CodeFixes/`
Tests	`src/Tests/CodeFixes.Tests/CS####IdentifierTests.cs`
Changelog	`CHANGELOG.md`

Implementation

Confirm metadata parameters (hard gate above).
Full XML, provider, and test patterns: references/implementation.md.

Changelog:

markdown
- Add code fix "TITLE" for CS#### ([#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/CodeFixes.Tests --no-build --filter "FullyQualifiedName~CS####"
cd src && dotnet format Roslynator.sln --no-restore --verify-no-changes --severity info

Common Mistakes

Mistake	Fix
Guess RCF `Title` / `Identifier` / code-action string	Ask — hard gate above
Follow `compiler-diagnostic-fixes-testing.md`	In-repo: `AbstractCSharpCompilerDiagnosticFixVerifier`
`DiagnosticId = "CS0106"` literal	Use `CompilerDiagnosticIdentifiers.CS####_Identifier` constant
`[	...
Skip `IsEnabled` in provider	Required for EditorConfig / global compiler-fix toggles
Only read testing doc	Also need `Diagnostics.xml`, `CodeFixes.xml`, codegen, provider base
Codegen from repo root	`cd tools && pwsh ./generate_code.ps1`

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

references/implementation.md3 KB

Frequently asked questions

What does the Add Compiler Diagnostic Fix AI skill do?

Why use Add Compiler Diagnostic Fix on TypingMind?

Because you install it once and use it with any model. Add Compiler Diagnostic Fix is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Add Compiler Diagnostic Fix in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/dotnet/roslynator/tree/main/.claude/skills/add-compiler-diagnostic-fix. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Add Compiler Diagnostic Fix?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Add Compiler Diagnostic Fix?

As many as you like. As long as a model supports skills, you can use Add Compiler Diagnostic Fix with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Add Compiler Diagnostic Fix AI skill free?

It is published on GitHub by dotnet. Check the repository for licensing terms. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Add Compiler Diagnostic Fix

Overview

When to Use

Confirm metadata parameters (hard gate)

Quick Reference

Implementation

Common Mistakes

Bundled files

Frequently asked questions

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