What is mcaf-dotnet-roslynator?

A set of C# code-checking tools for .NET, including Roslynator analyzer packages and an optional command-line tool. It finds problems, unused code, and cleanup opportunities beyond the checks built into the .NET SDK.

Use it to add C# analysis to builds, run checks from the command line, apply safe fixes, and find unused code.

It helps teams catch code issues consistently and apply fixes without relying only on manual review. It also avoids mixing overlapping analyzers or using a formatter for analysis work.

How managedcode/MCPGateway configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to managedcode/MCPGateway. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/managedcode/MCPGateway/main/.codex/skills/mcaf-dotnet-roslynator/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/managedcode/MCPGateway

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator/github.svg)](https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator)

Your own site

<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-dotnet-roslynator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,169 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 91% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00061	$0.01169
Opus 5.5	$0.00024	$0.00468
Sonnet 5.5	$0.00012	$0.00234
Haiku 4.5	$0.00006	$0.00117

Measured 1mo ago against content hash 228a224963e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcaf-dotnet-roslynator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

91% identical to dotnet-roslynator — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.codex/skills/mcaf-dotnet-roslynator/SKILL.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: .NET Roslynator

Trigger On

the repo uses or wants Roslynator.Analyzers
the team wants Roslynator CLI or extra Roslyn-based rules
the user asks about C# linting, static analysis, code cleanup, or unused code

Value

produce a concrete project delta: code, docs, config, tests, CI, or review artifact
reduce ambiguity through explicit planning, verification, and final validation skills
leave reusable project context so future tasks are faster and safer

Do Not Use For

repos that already have overlapping analyzer packs with no consolidation plan
formatting-only work when the repo already standardized on dotnet format or CSharpier

Inputs

the nearest AGENTS.md
current analyzer packages
.editorconfig

Quick Start

Read the nearest AGENTS.md and confirm scope and constraints.
Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
Return the Required Result Format with concrete artifacts and verification evidence.

Workflow

Prefer the NuGet analyzer packages for build-enforced checks.
Use the CLI when the repo needs one of these flows explicitly:
- analyze
- fix
- find-unused
- format
Build first when Roslynator needs compiled context.
Configure rule severity and Roslynator behavior in .editorconfig.
Avoid duplicating the same rules across multiple analyzer packs without a severity plan.
Treat CLI auto-fix as a controlled change:
- run it on a bounded target first
- rebuild
- rerun tests

Bootstrap When Missing

If Roslynator is not configured yet:

Detect current state:
- rg -n "Roslynator\\.Analyzers" -g '*.csproj' .
- rg --files -g '.config/dotnet-tools.json'
- dotnet tool list --local
- dotnet tool list --global
- command -v roslynator
Choose the install path deliberately:
- analyzer package: dotnet add PROJECT.csproj package Roslynator.Analyzers
- optional CLI: dotnet new tool-manifest (if missing) and dotnet tool install roslynator.dotnet.cli
Configure ownership in root .editorconfig so Roslynator does not fight SDK analyzers, StyleCop, or Meziantou.
If the CLI is adopted, add exact commands in AGENTS.md and CI, such as:
- dotnet tool run roslynator analyze SOLUTION_OR_PROJECT
- dotnet tool run roslynator fix SOLUTION_OR_PROJECT
Run dotnet build SOLUTION_OR_PROJECT and the selected Roslynator command, then return status: configured or status: improved.
If the repo wants only the current analyzer baseline and no Roslynator-specific CLI workflow, return status: not_applicable.

Read the full file on GitHub · 123 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/roslynator.md 2.8 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 123 lines · 61 tokens per session scan A 228a224963e4

Subscribe to this mod's changes

mcaf-dotnet-roslynator is a skill published in the GitHub repository managedcode/MCPGateway (5 stars, last pushed 8d ago), licensed MIT. It adds 61 tokens to every session and 1,169 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to dotnet-roslynator, differing in 8 lines, and is treated as a copy.

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MCPGateway: Skill for Codex