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 agentmods add skills/facturascripts/fs-claude-plugin/backend-developernpx skills add FacturaScripts/fs-claude-plugin --skill backend-developergit clone --depth 1 https://github.com/FacturaScripts/fs-claude-pluginWhat 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 | $0.00202 | $0.00823 |
| Opus 5 | $0.00101 | $0.00411 |
| Sonnet 5 | $0.00040 | $0.00165 |
| Haiku 4.5 | $0.00020 | $0.00082 |
Grade A, and why
backend-developer 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 2d 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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: backend-developer — Desarrollo backend de FacturaScripts
Esta skill conecta las peticiones de desarrollo backend del usuario con el agente
backend-developer, que tiene conocimiento profundo de la arquitectura de modelos,
workers, cron, migraciones y acceso a base de datos de FacturaScripts.
Por qué usar el agente
El agente backend-developer conoce los patrones específicos de FacturaScripts para modelos
(herencia de ModelClass, traits, validaciones), workers (eventos automáticos y personalizados),
cron jobs (frecuencias, overlapping), migraciones y acceso a base de datos. Responder sin el
agente introduce riesgo de usar patrones PHP genéricos que no se alinean con el framework.
Cómo invocar el agente
Usa el agente backend-developer pasándole la tarea del usuario:
Agente: backend-developer
Tarea: [descripción exacta de lo que necesita el usuario]
El agente:
- Consulta la documentación en
./agents/docs/para verificar patrones - Analiza el código existente del plugin si es necesario
- Implementa el componente backend siguiendo las convenciones de FacturaScripts
- Crea los archivos necesarios (Model, Table, Worker, Cron, Migration, Test)
Qué tareas activan esta skill
- "Crea un modelo para almacenar pedidos personalizados"
- "Añade un worker que se ejecute cuando se guarde una factura"
- "Necesito un cron job que limpie registros antiguos cada noche"
- "Crea una migración para rellenar el campo estado con 'activo' por defecto"
- "¿Cómo hago una consulta con DbQuery para obtener los totales por cliente?"
- "Necesito validar que el CIF no se repita antes de guardar"
- "Crea un modelo con relación a la tabla de clientes"
- "Crea o modifica la lógica de asientos contables de un plugin"
- "Los asientos se están creando con la subcuenta del ejercicio incorrecto"
- "Necesito generar un asiento con partidas en el ejercicio correcto según la fecha del pago"
- "¿Cómo obtengo la subcuenta de una forma de pago para un ejercicio concreto?"
- "¿Cómo cargo o creo un ejercicio contable por fecha?"
- Cualquier tarea que involucre lógica PHP del lado servidor en FacturaScripts
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.
- 2d ago First seen · 68 lines · 202 tokens per session scan A 69a48ceede91
backend-developer is a skill published in the GitHub repository FacturaScripts/fs-claude-plugin (8 stars, last pushed 2mo ago), licensed MIT. It adds 202 tokens to every session and 823 once invoked, about $0.0010 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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