.NET Skills is an AI coding plugin that provides skills and specialized guidance for professional .NET development, covering areas such as C#, Akka.NET, Aspire, Entity Framework Core, testing, and performance. .NET developers use it with coding assistants to apply production-oriented patterns while building and maintaining applications. The catalogue contains the plugin’s skills, agents, and instructions.
Borrowing it
Nothing to install: this file belongs to Aaronontheweb/dotnet-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Aaronontheweb/dotnet-skills/master/AGENTS.mdgit clone --depth 1 https://github.com/Aaronontheweb/dotnet-skillsWrote 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.
[](https://agentmods.dev/instructions/aaronontheweb/dotnet-skills/agents-md)<a href="https://agentmods.dev/instructions/aaronontheweb/dotnet-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/aaronontheweb/dotnet-skills/agents-md/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.
<a href="https://agentmods.dev/instructions/aaronontheweb/dotnet-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/aaronontheweb/dotnet-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01291 | $0.01291 |
| Opus 5.5 | $0.00516 | $0.00516 |
| Sonnet 5.5 | $0.00258 | $0.00258 |
| Haiku 4.5 | $0.00129 | $0.00129 |
Grade A, and why
dotnet-skills AGENTS.md 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.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to AI coding agents (Claude Code, Codex, OpenCode, and others) when working in this repository. It is the canonical file; CLAUDE.md is a symlink to it.
Repository Purpose
Canonical repository: https://github.com/Aaronontheweb/dotnet-skills
This is the official marketplace for .NET development skills and agents, covering the entire .NET ecosystem: C#, F#, MSBuild, NuGet, Aspire, testing frameworks, and specialized tools like DocFX and BenchmarkDotNet.
This is a knowledge base repository - not a traditional code project. There is no build system, tests, or compiled output.
Structure
dotnet-skills/
├── .claude-plugin/
│ ├── marketplace.json # Claude Code marketplace catalog
│ └── plugin.json # Claude Code plugin metadata + skill/agent registry
├── .codex-plugin/
│ └── plugin.json # Codex plugin metadata (skills auto-discovered from ./skills/)
├── .agents/
│ └── plugins/
│ └── marketplace.json # Codex marketplace
├── skills/ # Flat structure for Copilot compatibility
│ ├── akka-best-practices/SKILL.md
│ ├── aspire-integration-testing/SKILL.md
│ ├── csharp-coding-standards/SKILL.md
│ ├── testcontainers/SKILL.md
│ └── ...
├── agents/ # Agent definitions (flat .md files, Claude Code only)
└── scripts/ # Validation and sync scripts
Skill Naming Convention
Skills use a flat directory structure with prefixes for framework-specific skills:
akka-*- Akka.NET skillsaspire-*- .NET Aspire skillscsharp-*- C# language skillsmicrosoft-extensions-*- Microsoft.Extensions.* packagesplaywright-*- Playwright-specific skills- No prefix for general .NET skills (e.g.,
testcontainers,efcore-patterns)
File Formats
Skills are folders with SKILL.md:
---
name: skill-name
description: Brief description used for matching
---
Agents are markdown files with YAML frontmatter:
---
name: agent-name
description: Brief description used for matching
model: sonnet # sonnet, opus, or haiku
color: purple # optional
---
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 · 130 lines · 1,291 tokens per session scan A c9de7cb5d17c
dotnet-skills AGENTS.md is an instructions file published in the GitHub repository Aaronontheweb/dotnet-skills (1,234 stars, last pushed 9d ago), licensed MIT. It adds 1,291 tokens to every session, about $0.0052 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 2026-08-30.
Other instructions, from other repositories
graftcode graftcode-dotnet.instructions.md
Instructions for grft-dev/graftcode, covering graftcode — .net backend services, when this applies (always), authoritative docs (source of truth), golden rules and service = .net class library.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).