.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 mjml-email-templatesgit 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/mjml-email-templates)<a href="https://agentmods.dev/skills/aaronontheweb/dotnet-skills/mjml-email-templates"><img src="https://agentmods.dev/badge/skills/aaronontheweb/dotnet-skills/mjml-email-templates/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/skills/aaronontheweb/dotnet-skills/mjml-email-templates"><img src="https://agentmods.dev/badge/skills/aaronontheweb/dotnet-skills/mjml-email-templates.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 29 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.
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 | $0.00044 | $0.02465 |
| Opus 5 | $0.00022 | $0.01233 |
| Sonnet 5 | $0.00009 | $0.00493 |
| Haiku 4.5 | $0.00004 | $0.00247 |
Grade A, and why
mjml-email-templates 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 11d 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:
- mjml-email-templates — 100% identical, 1 lines differ
How it starts
The opening of the file, as written. The whole thing — 397 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MJML Email Templates
When to Use This Skill
Use this skill when:
- Building transactional emails (signup, password reset, invoices, notifications)
- Creating responsive email templates that work across clients
- Setting up MJML template rendering in .NET
Related skills:
aspire/mailpit-integration- Test emails locally with Mailpittesting/verify-email-snapshots- Snapshot test rendered HTML
Why MJML?
Problem: Email HTML is notoriously difficult. Each email client (Outlook, Gmail, Apple Mail) renders differently, requiring complex table-based layouts and inline styles.
Solution: MJML is a markup language that compiles to responsive, cross-client HTML:
<!-- MJML - simple and readable -->
<mj-section>
<mj-column>
<mj-text>Hello {{UserName}}</mj-text>
<mj-button href="{{ActionUrl}}">Click Here</mj-button>
</mj-column>
</mj-section>
Compiles to ~200 lines of table-based HTML with inline styles that works everywhere.
Installation
Add Mjml.Net
dotnet add package Mjml.Net
Embed Templates as Resources
In your .csproj:
<ItemGroup>
<EmbeddedResource Include="Templates\**\*.mjml" />
</ItemGroup>
Project Structure
src/
Infrastructure/
MyApp.Infrastructure.Mailing/
Templates/
_Layout.mjml # Shared layout (header, footer)
UserInvitations/
UserSignupInvitation.mjml
InvitationExpired.mjml
PasswordReset/
PasswordReset.mjml
Billing/
PaymentReceipt.mjml
RenewalReminder.mjml
Mjml/
IMjmlTemplateRenderer.cs
MjmlTemplateRenderer.cs
MjmlEmailMessage.cs
Composers/
IUserEmailComposer.cs
UserEmailComposer.cs
MyApp.Infrastructure.Mailing.csproj
Layout Template (_Layout.mjml)
<mjml>
<mj-head>
<mj-title>MyApp</mj-title>
<mj-preview>{{PreviewText}}</mj-preview>
<mj-attributes>
<mj-all font-family="'Helvetica Neue', Helvetica, Arial, sans-serif" />
<mj-text font-size="14px" color="#555555" line-height="20px" />
<mj-section padding="20px" />
</mj-attributes>
<mj-style inline="inline">
a { color: #2563eb; text-decoration: none; }
a:hover { text-decoration: underline; }
</mj-style>
</mj-head>
<mj-body background-color="#f3f4f6">
<!-- Header -->
<mj-section background-color="#ffffff" padding-bottom="0">
<mj-column>
<mj-image
src="https://myapp.com/logo.png"
alt="MyApp"
width="150px"
href="{{SiteUrl}}"
padding="30px 25px 20px 25px" />
</mj-column>
</mj-section>
<!-- Content injected here -->
<mj-section background-color="#ffffff" padding-top="20px" padding-bottom="40px">
<mj-column>
{{Content}}
</mj-column>
</mj-section>
<!-- Footer -->
<mj-section background-color="#f9fafb" padding="20px 25px">
<mj-column>
<mj-text align="center" font-size="12px" color="#9ca3af">
© 2025 MyApp Inc. All rights reserved.
</mj-text>
</mj-column>
</mj-section>
</mj-body>
</mjml>
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.
- 11d ago First seen · 397 lines · 44 tokens per session scan A 513a4437ba09
mjml-email-templates is a skill published in the GitHub repository Aaronontheweb/dotnet-skills (1,150 stars, last pushed today), licensed MIT. It adds 44 tokens to every session and 2,465 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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