umbraco-development

umbraco-development is a skill for Claude Code from smithdak/claude-marketplace. It costs 22 tokens per session (2,971 once invoked), scanned A, original, MIT.

A set of development patterns for Umbraco CMS, a system for managing website content. It covers Razor templates, dependency injection, controllers, content APIs, and both traditional and headless front ends.

In plain words
What is it for?
Use it when working on Umbraco Composers, services, controllers, Razor views, backoffice plugins, or content delivered through React, Vue, REST, or GraphQL.
Why use it?
It gives developers project structure and implementation guidance for connecting Umbraco content to website pages, services, and administrative extensions.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the umbraco plugin — 3 skills, 2 agents shipped together

Good fit Use it when working on Umbraco Composers, services, controllers, Razor views, backoffice plugins, or content delivered through React, Vue, REST, or GraphQL.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/smithdak/claude-marketplace/umbraco-development
Install

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.

Any agent
npx skills add smithdak/claude-marketplace --skill umbraco-development
Clone the repo
git clone --depth 1 https://github.com/smithdak/claude-marketplace

Made for: Claude Code.

Or install umbraco, the plugin that ships this one along with the rest of its 3 skills, 2 agents.

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.

agentmods badge for umbraco-development

README.md
[![agentmods](https://agentmods.dev/badge/skills/smithdak/claude-marketplace/umbraco-development/github.svg)](https://agentmods.dev/skills/smithdak/claude-marketplace/umbraco-development)
Your own site
<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.

agentmods 80×15 button for umbraco-development

Your own site · 80×15
<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>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,971 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.
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.

ModelPer sessionOnce 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

Measured 9d ago against content hash cea67f7f2ff2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

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.

plugins/umbraco-analyzer/skills/umbraco-development/SKILL.md · 537 lines

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>();
    }
}

Read the full file on GitHub · 537 lines

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.

  1. 9d ago First seen · 537 lines · 22 tokens per session scan A cea67f7f2ff2

Subscribe to this mod's changes

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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