A set of tools for developing websites and managing content in MODX Revolution, a content management system. It covers templates, reusable page fragments, dynamic code, settings, links, and common MODX add-ons.

Use it to build MODX templates, chunks, snippets, forms, SEO features, image handling, and schema markup. It also explains output formatting and when dynamic content should avoid caching.

MODX uses its own tags and rules for inserting content and running code, which can be difficult to remember or troubleshoot. This guidance gives developers a reference for writing and debugging those parts.

modx-cms — Skill for Claude Code and Codex by crecorn

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 crecorn/MODX-ClaudeSkill- --skill modx-claudeskill

Clone the repo

git clone --depth 1 https://github.com/crecorn/MODX-ClaudeSkill-

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/crecorn/modx-claudeskill-/modx-claudeskill/github.svg)](https://agentmods.dev/skills/crecorn/modx-claudeskill-/modx-claudeskill)

Your own site

<a href="https://agentmods.dev/skills/crecorn/modx-claudeskill-/modx-claudeskill"><img src="https://agentmods.dev/badge/skills/crecorn/modx-claudeskill-/modx-claudeskill/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/crecorn/modx-claudeskill-/modx-claudeskill"><img src="https://agentmods.dev/badge/skills/crecorn/modx-claudeskill-/modx-claudeskill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 130 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,525 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.

Model	Per session	Once invoked
Fable 5.1	$0.00130	$0.01525
Opus 5.5	$0.00052	$0.00610
Sonnet 5.5	$0.00026	$0.00305
Haiku 4.5	$0.00013	$0.00153

Measured 2mo ago against content hash b191f1aa19d2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

modx-cms 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.

SKILL.md · 170 lines

How it starts

The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MODX CMS Development

Expert guidance for MODX Revolution websites.

Tag Syntax Quick Reference

[[SnippetName]]           Cached snippet
[[!SnippetName]]          Uncached snippet (per-request)
[[$ChunkName]]            Chunk (HTML)
[[*fieldname]]            Resource field (pagetitle, content, alias, etc.)
[[++settingKey]]          System/Context setting
[[~resourceId]]           Link to resource
[[+placeholder]]          Placeholder from snippet/chunk

Output Modifiers

[[*pagetitle:striptags:limit=`60`]]
[[*field:default=`fallback value`]]
[[+date:strtotime:date=`%B %d, %Y`]]
[[*content:nl2br]]

Parameters

[[SnippetName? &param=`value` &other=`[[*field]]`]]
[[$ChunkName? &title=`[[*pagetitle]]` &class=`card`]]

Critical Syntax Rules

Resource fields use asterisk: [[*pagetitle]], [[*content]], [[*alias]]
Placeholders use plus: [[+title]], [[+idx]], [[+wrapper]]
TV names must be single words: heroImage not hero_image or hero-image
Uncached (!) only when dynamic: session data, user input, time-based
Nested tags resolve inner-first: [[Snippet? &id=[[*parent]]]]

Core Extras Stack

Extra	Purpose
pdoTools	High-performance listings (pdoResources, pdoMenu, pdoCrumbs)
MIGX	Repeatable content fields (FAQs, testimonials, galleries)
ClientConfig	Site-wide settings (contact, social, branding)
SEO Suite	Meta titles, descriptions, redirects
Image+	Visual image cropping with aspect ratio control
FormIt	Form processing with validation and hooks
modAI	AI-powered content generation

Common Patterns

pdoResources Listing

[[pdoResources?
  &parents=`[[*id]]`
  &limit=`12`
  &tpl=`tplCard`
  &includeTVs=`heroImage,introText`
  &processTVs=`1`
  &tvPrefix=``
  &sortby=`menuindex`
  &sortdir=`ASC`
]]

pdoMenu Navigation

[[pdoMenu?
  &parents=`0`
  &level=`2`
  &tplOuter=`@INLINE <ul class="nav">[[+wrapper]]</ul>`
  &tpl=`@INLINE <li><a href="[[+link]]">[[+menutitle]]</a>[[+wrapper]]</li>`
  &tplParentRow=`@INLINE <li class="has-children"><a href="[[+link]]">[[+menutitle]]</a>[[+wrapper]]</li>`
  &tplInner=`@INLINE <ul class="dropdown">[[+wrapper]]</ul>`
]]

Read the full file on GitHub · 170 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 170 lines · 130 tokens per session scan A b191f1aa19d2

Subscribe to this mod's changes

modx-cms is a skill published in the GitHub repository crecorn/MODX-ClaudeSkill- (12 stars, last pushed 10mo ago), licensed MIT. It adds 130 tokens to every session and 1,525 once invoked, about $0.0005 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 2026-08-30.

Frontend

modx-cms next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
modx-cmscrecorn/MODX-ClaudeSkill-	Skill	12	10mo ago	MIT	A	130	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code