# Notsy Facturación (remote · mcp.notsy.com.mx)

Emite CFDIs 4.0 y resuelve claves del SAT para agentes de IA (México), con permisos por API key.

- Trust score: 60/100 (medium)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `mcp.notsy.com.mx`: 60/100 (this document), [markdown](https://verifymcp.io/servers/heusai-notsy-facturacion/mcp.md), [page](https://verifymcp.io/servers/heusai-notsy-facturacion/mcp)

## Channel facts

- Endpoint: `https://mcp.notsy.com.mx/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 59/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 883 tokens (~220/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### Claude

```bash
claude mcp add --transport http heusai-notsy-facturacion https://mcp.notsy.com.mx/mcp
```

### Codex

```toml
[mcp_servers.heusai-notsy-facturacion]
url = "https://mcp.notsy.com.mx/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "heusai-notsy-facturacion": {
      "type": "remote",
      "url": "https://mcp.notsy.com.mx/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add heusai-notsy-facturacion --url https://mcp.notsy.com.mx/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  heusai-notsy-facturacion:
    url: "https://mcp.notsy.com.mx/mcp"
```

### Other

```json
{
  "mcpServers": {
    "heusai-notsy-facturacion": {
      "type": "http",
      "url": "https://mcp.notsy.com.mx/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 59, +3)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server
- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 56, +42)

- [security improvement] Transport: fail → pass
- [security] Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
- [functional improvement] Endpoint reachability: not serving MCP → reachable
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] Stability: unverified → 0.10
- [functional improvement] MCP protocol: unverified → pass

### 2026-07-28 (score 14, −41)

- [security regression] Endpoint reachability: reachable → not serving MCP
- [security regression] Stability: 0.03 → unverified
- [security regression] Transport: pass → fail
- [security] Authorization: Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes.
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified

### 2026-07-27 (score 55, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 54)

First indexed and scored.

## MCP tools (4)

### `whoami` (~48 tokens)

Confirma la identidad del agente: a qué negocio pertenece la API key, sus permisos
    (scopes), límites de emisión y uso del día. Úsalo para diagnosticar la conexión.

### `resolver_claves_sat` (~181 tokens)

Convierte una descripción en lenguaje natural a las claves del SAT necesarias para facturar.

    Devuelve `sugerencia` con clave_prodserv, clave_unidad, objeto_imp, tasa_iva y uso_cfdi, más
    `candidatos` por si quieres elegir otra. Llámalo antes de armar un concepto si no conoces las claves.

    Args:
        descripcion: qué se vende, p.ej. "consultoría de marketing" o "laptop Dell".
        unidad_hint: opcional, unidad de medida en palabras ("servicio", "hora", "pieza", "kg").
        con_iva: si el producto/servicio causa IVA 16% (default True).

Input parameters:

- `con_iva` (boolean)
- `descripcion` (string, required)
- `unidad_hint` (string)

### `preview_factura` (~316 tokens)

DRY-RUN: valida la factura y calcula los totales (subtotal, IVA, retenciones, total) SIN
    timbrar y sin costo. Úsalo SIEMPRE antes de emitir_cfdi para confirmar el monto y que los datos
    pasen la validación.

    Args:
        conceptos: lista de conceptos. Cada uno: {descripcion, clave_prodserv, clave_unidad,
            cantidad, valor_unitario, precio_incluye_iva (bool), tasa_iva (0.16/0.08/0.0),
            objeto_imp ("02"), retencion ("honorarios"|"arrendamiento"|"comisiones"|"fletes"|"")}.
        cliente: datos del receptor {rfc, nombre, regimen_fiscal, cp, uso_cfdi, email,
            es_publico_general} — o usa cliente_id si ya está guardado.
        cliente_id: id de un cliente guardado (alternativa a `cliente`).
        forma_pago: clave SAT de forma de pago (default "03" transferencia).
        metodo_pago: "PUE" (de contado) o "PPD" (a crédito).
        emisor_id: opcional, desde qué RFC emitir (multiemisor); None = predeterminado.

Input parameters:

- `cliente`
- `cliente_id`
- `conceptos` (array, required)
- `emisor_id`
- `forma_pago` (string)
- `metodo_pago` (string)

### `emitir_cfdi` (~259 tokens)

Emite y timbra un CFDI 4.0 OFICIAL ante el SAT (acción real, con costo y difícil de revertir).
    Llama primero a preview_factura. El motor aplica los límites de la API key (puede requerir
    aprobación humana) y registra la acción en la bitácora.

    Args: iguales a preview_factura, más:
        observaciones: texto libre opcional en el CFDI.
        anticipo_id: opcional, id de un anticipo previo a aplicar (relación 07 + nota de crédito).
        idempotency_key: OBLIGATORIA en producción (genera un UUID por operación y reúsalo en
            los reintentos). Si reintentas con la misma clave, NO se timbra de nuevo: se
            devuelve el resultado original (evita CFDIs duplicados ante el SAT).

Input parameters:

- `anticipo_id`
- `cliente`
- `cliente_id`
- `conceptos` (array, required)
- `emisor_id`
- `forma_pago` (string)
- `idempotency_key` (string)
- `metodo_pago` (string)
- `observaciones` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/heusai-notsy-facturacion/mcp#diagnostics

## Score history

- 2026-08-03: 60
- 2026-08-02: 60
- 2026-08-01: 59
- 2026-07-31: 59
- 2026-07-29: 56
- 2026-07-28: 14
- 2026-07-27: 55
- 2026-07-26: 54

## Links

- Remote endpoint: https://mcp.notsy.com.mx/mcp
- Authorisation metadata: https://mcp.notsy.com.mx/.well-known/oauth-protected-resource/mcp
- Website: https://facturacion.notsy.com.mx/developers
- Changelog RSS feed: https://verifymcp.io/servers/heusai-notsy-facturacion/mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/heusai-notsy-facturacion/mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/heusai-notsy-facturacion/mcp