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 mendixlabs/mxcli --skill javascript-actionsgit clone --depth 1 https://github.com/mendixlabs/mxcliWrote 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/mendixlabs/mxcli/javascript-actions)<a href="https://agentmods.dev/skills/mendixlabs/mxcli/javascript-actions"><img src="https://agentmods.dev/badge/skills/mendixlabs/mxcli/javascript-actions/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/mendixlabs/mxcli/javascript-actions"><img src="https://agentmods.dev/badge/skills/mendixlabs/mxcli/javascript-actions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00053 | $0.01710 |
| Opus 5.5 | $0.00021 | $0.00684 |
| Sonnet 5.5 | $0.00011 | $0.00342 |
| Haiku 4.5 | $0.00005 | $0.00171 |
Grade A, and why
javascript-actions 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 5d 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 — 217 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Find it fast
sed -n '<from>,<to>p' SKILL.md one section rather than reading the file;
./mxcli syntax <topic> answers how do I write this for a fraction of either.
| lines | section |
|---|---|
| 31-39 | When to Use This Skill |
| 40-51 | Overview |
| 52-85 | Syntax |
| 86-147 | Examples |
| 148-159 | Calling from a nanoflow |
| 160-184 | The generated .js file |
| 185-193 | Inspecting |
| 194-202 | Validation Checklist |
| 203-211 | Common Errors |
| 212-216 | Related Documentation |
Mendix JavaScript Actions Skill
Guidance for creating, calling, and dropping JavaScript actions in Mendix projects with MDL. JavaScript actions hold custom client-side logic and are called from nanoflows (not microflows — those use Java actions).
When to Use This Skill
- Adding client-side behaviour (browser/native APIs, DOM,
fetch, geolocation, …) - Logic that must run on the device rather than the server
- Calling an existing JavaScript action from a nanoflow
- Wrapping a marketplace/native capability exposed as a JS action
For server-side custom code, use Java actions instead (see java-actions).
Overview
A JavaScript action is two things on disk:
- The model unit (
JavaScriptActions$JavaScriptAction). - A source file
javascriptsource/<Module>/actions/<Name>.jscontaining an exportedasync function.
CREATE JAVASCRIPT ACTION writes both. The MDL body you provide becomes the
function body (between the BEGIN USER CODE / END USER CODE markers), so it
normally returns a Promise.
Syntax
CREATE [OR MODIFY] JAVASCRIPT ACTION Module.Name ( parameters )
RETURNS type
[EXPOSED AS 'caption' IN 'category']
[PLATFORM Web | Native | Hybrid | All] -- default Web
AS $$
<javascript>
$$;
DROP JAVASCRIPT ACTION Module.Name;
Clause order is fixed: returns, then exposed as, then platform, then as.
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.
- 5d ago Changed · +19 lines 5d09625a437b
- 15d ago Changed · +5 lines 84fa3bb1ac38
- 16d ago Changed 66f64e705778
- 1mo ago First seen · 193 lines · 53 tokens per session scan A c3a059a56cf3
javascript-actions is a skill published in the GitHub repository mendixlabs/mxcli (131 stars, last pushed yesterday), licensed Apache-2.0. It adds 53 tokens to every session and 1,710 once invoked, about $0.0002 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.
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