Notsy Facturación
REMOTE · MCP.NOTSY.COM.MX · SCANNED SEP 20
Emite CFDIs 4.0 y resuelve claves del SAT para agentes de IA (México), con permisos por API key.
Available components
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. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability64
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 952 tokens (~238/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the Notsy Facturación MCP server?
Notsy Facturación is a hosted endpoint at https://mcp.notsy.com.mx/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.notsy.com.mx
claude mcp add --transport http heusai-notsy-facturacion 'https://mcp.notsy.com.mx/mcp'
{
"mcpServers": {
"heusai-notsy-facturacion": {
"url": "https://mcp.notsy.com.mx/mcp"
}
}
} {
"servers": {
"heusai-notsy-facturacion": {
"type": "http",
"url": "https://mcp.notsy.com.mx/mcp"
}
}
} [mcp_servers.heusai-notsy-facturacion] url = "https://mcp.notsy.com.mx/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"heusai-notsy-facturacion": {
"type": "remote",
"url": "https://mcp.notsy.com.mx/mcp",
"enabled": true
}
}
} openclaw mcp add heusai-notsy-facturacion --url 'https://mcp.notsy.com.mx/mcp' --transport streamable-http
mcp_servers:
heusai-notsy-facturacion:
url: "https://mcp.notsy.com.mx/mcp" {
"McpServers": {
"heusai-notsy-facturacion": {
"Transport": "http",
"Url": "https://mcp.notsy.com.mx/mcp"
}
}
} assistant mcp add heusai-notsy-facturacion -t streamable-http -u 'https://mcp.notsy.com.mx/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 30 Aug 26 +1
- Stability: 0.97 → pass security
- 29 Aug 26 −1
- Stability: pass → 0.97 functional
- 28 Aug 26 +1
- Stability: 0.97 → pass security
- 27 Aug 26 −1
- Stability: pass → 0.97 functional
- 26 Aug 26 +2
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 24 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Aug 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “preview_factura” rewrote its description, which is the text the model reads security
- “preview_factura” added an optional parameter “anticipo_id” cosmetic
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Probed https://mcp.notsy.com.mx/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.notsy.com.mx | CN=YR1,O=Let's Encrypt,C=US | 7 Aug 2026 | 5 Nov 2026 | RSA 4096 | SHA256-RSA | 5300ff78bb585b9b69cb5199529d3e99753 |
| SANs: mcp.notsy.com.mx | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.notsy.com.mx. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| mx. | present | 43850 | 8 | Verified |
| com.mx. | present | 43850 | 8 | Verified |
| notsy.com.mx. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.notsy.com.mx/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.notsy.com.mx/mcp | HTTPS enforced | 301 | https://mcp.notsy.com.mx/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
emitir_cfdi ~259
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).
| Name | Type | Req | Description |
|---|---|---|---|
| anticipo_id | – | – | – |
| cliente | – | – | – |
| cliente_id | – | – | – |
| conceptos | array | yes | – |
| emisor_id | – | – | – |
| forma_pago | string | – | – |
| idempotency_key | string | – | – |
| metodo_pago | string | – | – |
| observaciones | string | – | – |
No output schema declared.
No examples provided.
preview_factura ~381
DRY-RUN: valida la factura y calcula los totales (subtotal, IVA, retenciones, total) SIN timbrar, reservar ni cobrar. También devuelve la cotización canónica de créditos y el saldo proyectado. Úsalo SIEMPRE antes de emitir_cfdi para confirmar el monto, el costo y que los datos pasen la validación. Aplicar un anticipo cotiza dos CFDI (ingreso + egreso). 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. anticipo_id: opcional, anticipo previo a aplicar; cotiza dos CFDI.
| Name | Type | Req | Description |
|---|---|---|---|
| anticipo_id | – | – | – |
| cliente | – | – | – |
| cliente_id | – | – | – |
| conceptos | array | yes | – |
| emisor_id | – | – | – |
| forma_pago | string | – | – |
| metodo_pago | string | – | – |
No output schema declared.
No examples provided.
resolver_claves_sat ~181
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).
| Name | Type | Req | Description |
|---|---|---|---|
| con_iva | boolean | – | – |
| descripcion | string | yes | – |
| unidad_hint | string | – | – |
No output schema declared.
No examples provided.
whoami ~48
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
What is the Notsy Facturación MCP server?
Notsy Facturación is an MCP server listed in the public MCP registry as io.github.HEUSAI/notsy-facturacion. Emite CFDIs 4.0 y resuelve claves del SAT para agentes de IA (México), con permisos por API key. This page covers its hosted endpoint (https://mcp.notsy.com.mx/mcp).
Is the Notsy Facturación MCP server safe to use?
Notsy Facturación scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Notsy Facturación MCP server expose?
Notsy Facturación exposes 4 tools: whoami, resolver_claves_sat, preview_factura, emitir_cfdi. Their descriptions and schemas cost roughly 869 tokens of context every time the server is loaded.
Does the Notsy Facturación MCP server require authentication?
No. We connected to Notsy Facturación without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Notsy Facturación MCP server still maintained?
Notsy Facturación is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.