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 smithdak/claude-marketplace --skill umbraco-developmentgit clone --depth 1 https://github.com/smithdak/claude-marketplaceWrote 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/smithdak/claude-marketplace/umbraco-development)<a href="https://agentmods.dev/skills/smithdak/claude-marketplace/umbraco-development"><img src="https://agentmods.dev/badge/skills/smithdak/claude-marketplace/umbraco-development/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/smithdak/claude-marketplace/umbraco-development"><img src="https://agentmods.dev/badge/skills/smithdak/claude-marketplace/umbraco-development.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 | $0.00022 | $0.02971 |
| Opus 5 | $0.00011 | $0.01486 |
| Sonnet 5 | $0.00004 | $0.00594 |
| Haiku 4.5 | $0.00002 | $0.00297 |
Grade A, and why
umbraco-development 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 9d 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 — 537 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Bundled Skills
This plugin includes the following additional skills for comprehensive development context:
| Skill | Purpose |
|---|---|
frontend-razor |
Razor view syntax, layouts, partials, tag helpers |
frontend-classic |
CSS/SASS organization, JavaScript/jQuery patterns (traditional sites) |
frontend-modern |
React, Vue, TypeScript patterns (headless/decoupled sites) |
backend-csharp |
C#/.NET DI patterns, service architecture, async/await |
fullstack-classic |
jQuery AJAX integration, form handling (traditional) |
fullstack-modern |
REST/GraphQL APIs, Content Delivery API integration (headless) |
These skills are automatically included when you install the Umbraco Analyzer plugin.
Umbraco Development Patterns
Project Structure
src/
├── Web/ # Main Umbraco web project
│ ├── App_Plugins/ # Backoffice extensions
│ ├── Composers/ # DI and configuration
│ ├── Controllers/ # Surface and API controllers
│ ├── Views/ # Razor templates
│ └── Program.cs
├── Core/ # Business logic (optional)
│ ├── Services/
│ ├── Models/
│ └── Interfaces/
└── Infrastructure/ # Data access (optional)
├── Repositories/
└── ExternalServices/
Composer Pattern
Composers are the entry point for dependency injection and configuration.
Basic Composer
using Umbraco.Cms.Core.Composing;
public class ServicesComposer : IComposer
{
public void Compose(IUmbracoBuilder builder)
{
// Register services
builder.Services.AddScoped<IProductService, ProductService>();
builder.Services.AddScoped<ISearchService, SearchService>();
// Register notification handlers
builder.AddNotificationHandler<ContentPublishedNotification, ContentPublishedHandler>();
builder.AddNotificationAsyncHandler<ContentSavingNotification, ContentSavingHandler>();
}
}
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.
- 9d ago First seen · 537 lines · 22 tokens per session scan A cea67f7f2ff2
umbraco-development is a skill published in the GitHub repository smithdak/claude-marketplace (3 stars, last pushed 7mo ago), licensed MIT. It adds 22 tokens to every session and 2,971 once invoked, about $0.0001 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 2026-08-31.
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