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 FacturaScripts/fs-claude-plugin --skill crear-extensiongit clone --depth 1 https://github.com/FacturaScripts/fs-claude-pluginWrote 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/facturascripts/fs-claude-plugin/crear-extension)<a href="https://agentmods.dev/skills/facturascripts/fs-claude-plugin/crear-extension"><img src="https://agentmods.dev/badge/skills/facturascripts/fs-claude-plugin/crear-extension.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.02000 |
| Opus 5 | $0.00015 | $0.01000 |
| Sonnet 5 | $0.00006 | $0.00400 |
| Haiku 4.5 | $0.00003 | $0.00200 |
Grade A, and why
crear-extension 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 8d 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 — 257 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Crear Extensión FacturaScripts
Las extensiones permiten añadir funcionalidad a clases del core o de otros plugins sin modificar su código fuente.
Atajo con fsmaker
Antes de crear los archivos a mano, considera usar la herramienta CLI:
fsmaker extension
fsmaker solicita el tipo de extensión (tabla, modelo, controlador, XMLView o vista Twig) y el nombre de la clase a extender, y genera el archivo base con la estructura correcta. Los apartados siguientes documentan la estructura completa para cuando necesites ajustar o completar la extensión manualmente.
Extensión de Modelo
Archivo: Plugins/MiPlugin/Extension/Model/NombreModelo.php
<?php
namespace FacturaScripts\Plugins\MiPlugin\Extension\Model;
use Closure;
class NombreModelo
{
// Se ejecuta ANTES de guardar el modelo
public function saveInsert(): Closure
{
return function () {
// $this es el modelo original
// Código a ejecutar antes de insertar
};
}
// Se ejecuta DESPUÉS de guardar
public function saveUpdate(): Closure
{
return function () {
// Código a ejecutar después de actualizar
};
}
// Se ejecuta al eliminar
public function delete(): Closure
{
return function () {
// Código a ejecutar al eliminar
};
}
// Se ejecuta en test() (validación)
public function test(): Closure
{
return function () {
// Añadir validaciones extra
// Retorna void, el pipe continúa
};
}
}
Métodos disponibles para extender en modelos
- clear() — al instanciar el modelo, asigna valores predeterminados
- delete() — tras el delete() del modelo
- deleteBefore() — antes del delete(); si devuelve
false, impide el borrado - save() — tras el save() del modelo
- saveBefore() — antes del save(); si devuelve
false, impide el guardado - saveInsert() — tras el saveInsert() del modelo
- saveInsertBefore() — antes del saveInsert(); si devuelve
false, lo impide - saveUpdate() — tras el saveUpdate() del modelo
- saveUpdateBefore() — antes del saveUpdate(); si devuelve
false, lo impide - test() — tras el test() del modelo
- testBefore() — antes del test(); si devuelve
false, lo impide - url() — tras el url() del modelo
- onChange() — antes del saveUpdate(), para detectar cambios en columnas
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.
- 8d ago First seen · 257 lines · 31 tokens per session scan A 3ede8d1ba175
crear-extension is a skill published in the GitHub repository FacturaScripts/fs-claude-plugin (8 stars, last pushed 5d ago), licensed MIT. It adds 31 tokens to every session and 2,000 once invoked, about $0.0002 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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