What is csharp-code-style?

A set of required rules for writing and maintaining C# and .NET project files. It covers names, formatting, cleanup after edits, and use of newer C# syntax.

Use it when creating, changing, reviewing, refactoring, or explaining C# files, project files, or other .NET code.

It keeps C# changes consistent and tells the coding agent how to inspect code for errors and type information before and after meaningful edits.

How airtaxi/LidGuard configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to airtaxi/LidGuard. 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/airtaxi/LidGuard/master/.agents/skills/csharp-code-style/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/airtaxi/LidGuard

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/airtaxi/lidguard/csharp-code-style/github.svg)](https://agentmods.dev/skills/airtaxi/lidguard/csharp-code-style)

Your own site

<a href="https://agentmods.dev/skills/airtaxi/lidguard/csharp-code-style"><img src="https://agentmods.dev/badge/skills/airtaxi/lidguard/csharp-code-style/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/airtaxi/lidguard/csharp-code-style"><img src="https://agentmods.dev/badge/skills/airtaxi/lidguard/csharp-code-style.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,587 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found 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	$0.00062	$0.04587
Opus 5.5	$0.00025	$0.01835
Sonnet 5.5	$0.00012	$0.00917
Haiku 4.5	$0.00006	$0.00459

Measured 1mo ago against content hash 99734065a794, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

csharp-code-style 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.

.agents/skills/csharp-code-style/SKILL.md · 312 lines

How it starts

The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.

C# Code Style

Overview

Read this skill before making any C#-related code changes. Apply every rule below strictly unless the user explicitly overrides a rule for the current task.

Repository Setup

When creating a new Git repository for a .NET/C# project, generate the standard .NET .gitignore with dotnet new gitignore.
If a WinUI project or another project type needs .pubxml publish profiles to remain tracked, comment out the default .gitignore rule that excludes *.pubxml instead of deleting it. Keep user-specific publish profile ignores such as *.pubxml.user in place.

C# MCP Usage

When working in a C# project, actively use the csharp-lsp-mcp MCP server as the default way to gather language-server context, especially for diagnostics, hover/type information, definitions, references, symbols, code actions, rename previews, and XAML analysis.
Prefer checking LSP diagnostics and symbols before and after meaningful C# edits when the MCP server is available.
If a task already requires or explicitly asks for a project build after edits, skip LSP diagnostic passes that would be superseded by that build and proceed directly to the build when validation is needed.
Before using its C# or XAML tools in a project, call csharp_set_workspace with the solution or project directory.
Before rebuilding a project after the MCP has loaded it, call csharp_stop to release LSP-held file locks, then call csharp_set_workspace again after the rebuild if more C# or XAML analysis is needed.

CsWin32 Generated File Inspection

CsWin32 (Microsoft.Windows.CsWin32) is a Roslyn source generator — it does not write generated .cs files to disk by default. Generated P/Invoke signatures exist only in memory during compilation and are embedded directly into the assembly. When you need to inspect the exact generated signatures (parameter types, unsafe modifiers, WIN32_ERROR return types, pointer vs marshalling forms, etc.), use an isolated temporary inspection project so the real project is never modified.

Read the full file on GitHub · 312 lines

Files

What ships with it

3 files 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.

1mo ago Changed · +39 lines 99734065a794
2mo ago First seen · 273 lines · 62 tokens per session scan A 2cd8fe5fe87a

Subscribe to this mod's changes

csharp-code-style is a skill published in the GitHub repository airtaxi/LidGuard (13 stars, last pushed 1mo ago), licensed MIT. It adds 62 tokens to every session and 4,587 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

C# and .NET Languages caffeinate hibernate lid-close mcp nativeaot power-management

csharp-code-style next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
csharp-code-styleairtaxi/LidGuard	Skill	13	1mo ago	MIT	A	62	Codex
aot-trimmingAaronontheweb/dotnet-skills	Skill	1.3k	9d ago	MIT	A	181	Claude Code
build-and-testmicrosoft/agent-framework	Skill	15k	yesterday	MIT	A	26	Claude Code, Codex
agui-dotnet-streaming-chatag-ui-protocol/ag-ui	Skill	17k	yesterday	MIT	A	223	Claude Code
azure-mgmt-apicenter-dotnetmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	97	Claude Code
migrate-xunit-to-xunit-v3dotnet/skills	Skill	5.8k	yesterday	MIT	A	149	Claude Code
migrate-dotnet8-to-dotnet9dotnet/skills	Skill	5.8k	yesterday	MIT	A	176	Claude Code

LidGuard: Skill for Codex