mcaf-dotnet-code-analysis

Guidance for enabling the code analyzers included with the .NET SDK. These analyzers inspect source code during builds and report rule violations as warnings or errors.

In plain words
What is it for?
Use it to configure `EnableNETAnalyzers`, analysis levels and modes, `.editorconfig` severities, and build checks such as treating warnings as errors.
Why use it?
It lets a .NET project define which checks run and whether warnings should block a build, making code quality rules consistent across developers and CI.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/managedcode/mcpgateway/mcaf-dotnet-code-analysis
Any agent
npx skills add managedcode/MCPGateway --skill mcaf-dotnet-code-analysis
Clone the repo
git clone --depth 1 https://github.com/managedcode/MCPGateway

Made for: Claude Code, Codex.

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 978 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% 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.

ModelPer sessionOnce invoked
Fable 5 $0.00052 $0.00978
Opus 5 $0.00026 $0.00489
Sonnet 5 $0.00010 $0.00196
Haiku 4.5 $0.00005 $0.00098

Measured yesterday against content hash ca6223cd80bc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mcaf-dotnet-code-analysis 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 yesterday.

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

100% identical to mcaf-dotnet-code-analysis — 0 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-code-analysis/SKILL.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: .NET Code Analysis

Trigger On

  • the repo wants first-party .NET analyzers
  • CI should fail on analyzer warnings
  • the team needs AnalysisLevel or AnalysisMode guidance

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

  • third-party analyzer selection by itself
  • formatting-only work

Inputs

  • the nearest AGENTS.md
  • project files or Directory.Build.props
  • current analyzer severity policy

Quick Start

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

Workflow

  1. Start with SDK analyzers before adding third-party packages.
  2. Enable or document:
    • EnableNETAnalyzers
    • AnalysisLevel
    • AnalysisMode
    • warning policy such as TreatWarningsAsErrors
  3. Keep per-rule severity in the repo-root .editorconfig.
  4. Use dotnet build as the analyzer execution gate in CI.
  5. Add third-party analyzers only for real gaps that first-party rules do not cover.

Bootstrap When Missing

If first-party .NET code analysis is requested but not configured yet:

  1. Detect current state:
    • dotnet --info
    • rg -n "EnableNETAnalyzers|AnalysisLevel|AnalysisMode|TreatWarningsAsErrors" -g '*.csproj' -g 'Directory.Build.*' .
  2. Treat SDK analyzers as built-in functionality, not as a separate third-party install path.
  3. Enable the needed properties in the solution's MSBuild config, typically in Directory.Build.props or the target project file:
    • EnableNETAnalyzers
    • AnalysisLevel
    • AnalysisMode when needed
    • warning policy such as TreatWarningsAsErrors
  4. Keep rule-level severity in the repo-root .editorconfig.
  5. Run dotnet build SOLUTION_OR_PROJECT and return status: configured or status: improved.
  6. If the repo intentionally defers analyzer policy to another documented build layer, return status: not_applicable.

Read the full file on GitHub · 113 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.

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.

  1. yesterday First seen · 113 lines · 52 tokens per session scan A ca6223cd80bc

Subscribe to this mod's changes

mcaf-dotnet-code-analysis is a skill published in the GitHub repository managedcode/MCPGateway (5 stars, last pushed 2d ago), licensed MIT. It adds 52 tokens to every session and 978 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to mcaf-dotnet-code-analysis, differing in 0 lines, and is treated as a copy.