.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.
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.
npx skills add Aaronontheweb/dotnet-skills --skill project-structuregit 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/skills/aaronontheweb/dotnet-skills/project-structure)<a href="https://agentmods.dev/skills/aaronontheweb/dotnet-skills/project-structure"><img src="https://agentmods.dev/badge/skills/aaronontheweb/dotnet-skills/project-structure.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 10 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 121 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 140 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 156 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 179 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 207 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 231 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 259 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Prompt Injection · line 465 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- medium Data Exfiltration · line 445 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 463 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00046 | $0.03834 |
| Opus 5 | $0.00023 | $0.01917 |
| Sonnet 5 | $0.00009 | $0.00767 |
| Haiku 4.5 | $0.00005 | $0.00383 |
Grade A, and why
dotnet-project-structure 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 8d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- dotnet-project-structure — 100% identical, 1 lines differ
How it starts
The opening of the file, as written. The whole thing — 522 lines — stays where its author put it; the contents beside it link to each section on GitHub.
.NET Project Structure and Build Configuration
When to Use This Skill
Use this skill when:
- Setting up a new .NET solution with modern best practices
- Configuring centralized build properties across multiple projects
- Implementing central package version management
- Setting up SourceLink for debugging and NuGet packages
- Automating version management with release notes
- Pinning SDK versions for consistent builds
Related Skills
dotnet-local-tools- Managing local .NET tools with dotnet-tools.jsonmicrosoft-extensions-configuration- Configuration validation patterns
Solution File Format (.slnx)
The .slnx format is the modern XML-based solution file format introduced in .NET 9. It replaces the traditional .sln format.
Benefits Over Traditional .sln
| Aspect | .sln (Legacy) | .slnx (Modern) |
|---|---|---|
| Format | Custom text format | Standard XML |
| Readability | GUIDs, cryptic syntax | Clean, human-readable |
| Version control | Hard to diff/merge | Easy to diff/merge |
| Editing | IDE required | Any text editor |
Version Requirements
| Tool | Minimum Version |
|---|---|
| .NET SDK | 9.0.200 |
| Visual Studio | 17.13 |
| MSBuild | Visual Studio Build Tools 17.13 |
Note: Starting with .NET 10, dotnet new sln creates .slnx files by default. In .NET 9, you must explicitly migrate or specify the format.
Example .slnx File
<Solution>
<Folder Name="/build/">
<File Path="Directory.Build.props" />
<File Path="Directory.Packages.props" />
<File Path="global.json" />
<File Path="NuGet.Config" />
<File Path="README.md" />
</Folder>
<Folder Name="/src/">
<Project Path="src/MyApp/MyApp.csproj" />
<Project Path="src/MyApp.Core/MyApp.Core.csproj" />
</Folder>
<Folder Name="/tests/">
<Project Path="tests/MyApp.Tests/MyApp.Tests.csproj" />
</Folder>
</Solution>
Migrating from .sln to .slnx
Use the dotnet sln migrate command to convert existing solutions:
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.
- 8d ago First seen · 522 lines · 46 tokens per session scan A 6d4d9b2063eb
dotnet-project-structure is a skill published in the GitHub repository Aaronontheweb/dotnet-skills (1,143 stars, last pushed 1mo ago), licensed MIT. It adds 46 tokens to every session and 3,834 once invoked, about $0.0002 per session on Opus 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.
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