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umbraco-validation-context

umbraco-validation-context is a skill for Claude Code from umbraco/Umbraco-CMS-Backoffice-Skills. It costs 18 tokens per session (2,798 once invoked), scanned A, original, no licence file.

Guidance for validating forms in the Umbraco backoffice using Umbraco's validation context.

In plain words
What is it for?
Use it when implementing validation for fields or forms in an Umbraco backoffice extension.
Why use it?
It helps you add form checks in the way expected by Umbraco's backoffice system.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the umbraco-cms-backoffice-skills plugin — 67 skills, 1 agent shipped together

not rated 27repo 1mo ago A scan 18 tokens no licence

Good fit Use it when implementing validation for fields or forms in an Umbraco backoffice extension.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context
View source ↗ umbraco/Umbraco-CMS-Backoffice-Skills
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 umbraco/Umbraco-CMS-Backoffice-Skills --skill umbraco-validation-context
Clone the repo
git clone --depth 1 https://github.com/umbraco/Umbraco-CMS-Backoffice-Skills

Made for: Claude Code.

Or install umbraco-cms-backoffice-skills, the plugin that ships this one along with the rest of its 67 skills, 1 agent.

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-validation-context

README.md
[![agentmods](https://agentmods.dev/badge/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context/github.svg)](https://agentmods.dev/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context)
Your own site
<a href="https://agentmods.dev/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context"><img src="https://agentmods.dev/badge/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context/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-validation-context

Your own site · 80×15
<a href="https://agentmods.dev/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context"><img src="https://agentmods.dev/badge/skills/umbraco/umbraco-cms-backoffice-skills/umbraco-validation-context.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,798 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 unknown 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 $0.00018 $0.02798
Opus 5.5 $0.00007 $0.01119
Sonnet 5.5 $0.00004 $0.00560
Haiku 4.5 $0.00002 $0.00280

Measured 2mo ago against content hash 5152924f1d2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

umbraco-validation-context 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 2mo 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-backoffice-skills/skills/umbraco-validation-context/SKILL.md · 411 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2mo ago First seen · 411 lines · 18 tokens per session scan A 5152924f1d2d

Subscribe to this mod's changes

umbraco-validation-context is a skill published in the GitHub repository umbraco/Umbraco-CMS-Backoffice-Skills (27 stars, last pushed 1mo ago), with no licence file. It adds 18 tokens to every session and 2,798 once invoked, about $0.0001 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 2026-09-03.

Frontend
Related

umbraco-validation-context compared with skills from other repositories

umbraco-validation-context next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
umbraco-validation-contextumbraco/Umbraco-CMS-Backoffice-SkillsSkill271mo agononeA18Claude Code
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k2d agoMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
systematic-debuggingobra/superpowersSkill315k6d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code