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/api-restnpx skills add FacturaScripts/fs-claude-plugin --skill api-restgit 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 | $0.00063 | $0.01289 |
| Opus 5 | $0.00032 | $0.00645 |
| Sonnet 5 | $0.00013 | $0.00258 |
| Haiku 4.5 | $0.00006 | $0.00129 |
Grade A, and why
api-rest 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 — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: API REST de FacturaScripts
La API REST de FacturaScripts permite acceder, crear, modificar y eliminar datos desde aplicaciones externas. La URL base siempre es {url-instalacion}/api/3.
Activación y autenticación
- Activar la API: Menú Administrador → Panel de control → sección "Por defecto" → marcar "Activar API" → Guardar.
- Crear una API Key: Menú Administrador → Panel de control → sección "API Keys" → botón "Nuevo" → marcar "Acceso completo".
- Autenticar las peticiones: Añadir la cabecera
Token: {tu-api-key}en cada petición.
Operaciones CRUD básicas
GET — Listar registros
GET /api/3/impuestos
Por defecto devuelve 50 registros. Usa limit y offset para paginar:
GET /api/3/impuestos?limit=10&offset=0 # página 1
GET /api/3/impuestos?limit=10&offset=10 # página 2
GET /api/3/impuestos?limit=10&offset=20 # página 3
El total de registros disponibles se devuelve en la cabecera X-Total-Count.
Filtros
# filtro por valor exacto
GET /api/3/impuestos?filter[codimpuesto]=IVA21
# varios filtros (AND por defecto)
GET /api/3/impuestos?filter[codimpuesto]=IVA21&filter[tipo]=1
# operadores de comparación
GET /api/3/productos?filter[precio_gt]=100 # precio > 100
GET /api/3/productos?filter[precio_gte]=100 # precio >= 100
GET /api/3/productos?filter[precio_lt]=50 # precio < 50
GET /api/3/productos?filter[precio_lte]=50 # precio <= 50
GET /api/3/productos?filter[referencia_neq]=X # referencia != X
GET /api/3/productos?filter[referencia_like]=pez # referencia contiene "pez"
# cambiar AND por OR entre filtros
GET /api/3/divisas?filter[descripcion_like]=PESO&filter[tasaconv_gt]=2&operation[tasaconv_gt]=OR
Ordenación
# ordenar por un campo
GET /api/3/divisas?sort[coddivisa]=DESC
# ordenar por varios campos
GET /api/3/productos?sort[precio]=ASC&sort[stockfis]=DESC
GET — Obtener un registro concreto
La consulta se hace por la clave primaria del modelo:
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 · 195 lines · 63 tokens per session scan A aa799fb6f607
api-rest is a skill published in the GitHub repository FacturaScripts/fs-claude-plugin (8 stars, last pushed 2mo ago), licensed MIT. It adds 63 tokens to every session and 1,289 once invoked, about $0.0003 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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