custom-widgets

Documentation for placing and configuring reusable widgets in Mendix pages. Mendix is a platform for building applications, and MDL is its page-definition language.

In plain words
What is it for?
Use it to add widget data sources, columns, templates, filters, responsive layouts, and widget definitions in CREATE PAGE or ALTER PAGE commands.
Why use it?
It explains the syntax and structure needed when a page uses widgets such as galleries, filters, grids, or third-party components.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/mendixlabs/mxcli/custom-widgets
Any agent
npx skills add mendixlabs/mxcli --skill custom-widgets
Clone the repo
git clone --depth 1 https://github.com/mendixlabs/mxcli

Made for: Claude Code, Codex.

Per session 101 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,409 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00101 $0.05409
Opus 5 $0.00051 $0.02704
Sonnet 5 $0.00020 $0.01082
Haiku 4.5 $0.00010 $0.00541

Measured yesterday against content hash a33ca2605036, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

custom-widgets 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 yesterday.

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.

.claude/skills/mendix/custom-widgets/SKILL.md · 495 lines

How it starts

The opening of the file, as written. The whole thing — 495 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Custom & Pluggable Widgets in MDL

Built-in Pluggable Widgets

GALLERY

Card-layout list with optional template content and filters.

gallery galleryName (
  datasource: database from Module.Entity sort by Name asc,
  selection: single | multiple | none,
  DesktopColumns: 3,
  TabletColumns: 2,
  PhoneColumns: 1
) {
  template template1 {
    dynamictext title (content: '{1}', contentparams: [{1} = Name], rendermode: H4)
    dynamictext info  (content: '{1}', contentparams: [{1} = Email])
  }
  filter filter1 {
    textfilter   searchName  (attribute: Name)
    numberfilter searchScore (attribute: Score)
    dropdownfilter searchStatus (attribute: status)
    datefilter   searchDate  (attribute: CreatedAt)
  }
}
  • template block -> mapped to content property (child widgets rendered per row)
  • filter block -> mapped to filtersPlaceholder property (shown above list)
  • selection: none omits the selection property (default if omitted)
  • DesktopColumns, TabletColumns, PhoneColumns control responsive grid columns (default: 1 each, omit if default)
  • Children written directly under GALLERY (no container) go to the first slot with mdlContainer: "template"

COMBOBOX

Two modes depending on the attribute type:

-- Enumeration mode (Attribute is an enum)
combobox cbStatus (label: 'Status', attribute: status)

-- Association mode (Attribute is an association)
combobox cmbCustomer (
  label: 'Customer',
  attribute: Order_Customer,
  datasource: database Module.Customer,
  CaptionAttribute: Name
)
  • Engine detects association mode when datasource is present (hasDataSource condition)
  • CaptionAttribute is the display attribute on the target entity
  • In association mode, mapping order matters: DataSource must resolve before Association (sets entityContext)

Charts (Mendix Charts.mpk)

Charts are pluggable widgets authored by their package id. Install Charts.mpk into the project's widgets/ folder first (any Charts-based app has it); exec auto-generates the .def.json.

Read the full file on GitHub · 495 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. yesterday First seen · 495 lines · 101 tokens per session scan A a33ca2605036

Subscribe to this mod's changes

custom-widgets is a skill published in the GitHub repository mendixlabs/mxcli (115 stars, last pushed 2d ago), licensed Apache-2.0. It adds 101 tokens to every session and 5,409 once invoked, about $0.0005 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.