# `com.fiscalisto/docs` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/com.fiscalisto/docs
- JSON: https://anlyon.dev/api/v1/servers/com.fiscalisto/docs
- Version: 1.2.0 (active)
- Publisher: com.fiscalisto (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-10-27T21:17:39.757Z

Title and description, as the publisher wrote them:

```untrusted-server-text
Fiscalisto API docs
Docs for Fiscalisto's Mexican e-invoicing API (CFDI 4.0): search, operations, SDK code, errors.
```

Scanned 2026-10-27T21:18:02.684Z over streamable-http.

**9 tools: 3 change things and 6 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 3 | ask |
| Only reads | read | 6 | allow |

## Exfil surface

No private-data -> untrusted-input -> outbound path in this server alone: no tool is tagged untrusted-input or outbound.

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | `mcp__docs__get_page` `mcp__docs__search_docs` |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | none |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | none |

## Findings

- **warn** Annotations that disagree with the tool in `get_started` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "get_started" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "get_started" says "get": a word for reading.
```

- **warn** Annotations that disagree with the tool in `explain_error` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "explain_error" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "explain_error" says "explain": a word for reading.
```


## Changes things (3)

Creates or changes something that can be changed back. Claude Code: ask.

### `call_api`

- The name "call_api" says "call": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Hace una solicitud real a la API en modo de pruebas con la llave fk_test_ de la persona (nunca una fk_live_) y devuelve el código, el Request-Id y el JSON de la respuesta. Para probar un cuerpo antes de escribir el código. Timbra con el emisor de pruebas del SAT, sin costo.
```

### `explain_error`

- The name "explain_error" says "explain": a word for reading.
- The input takes a statement or command to run (input.code), which can change anything it can reach.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Qué significa un código de error de la API (el error.code de la respuesta, por ejemplo issuer_required) y cómo resolverlo.
```

### `get_started`

- The name "get_started" says "get": a word for reading.
- The description's first verb is "start": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Start here when asked to add Fiscalisto or Mexican invoicing (CFDI 4.0) to an app. Empiece aquí: cómo integrar la API en una app de principio a fin (llave, SDK de su lenguaje, timbrar con Idempotency-Key, datos del cliente, errores del SAT, webhooks firmados, cancelar, probar sin costo y pasar a producción), en una página.
```

## Only reads (6)

Looks things up and changes nothing. Claude Code: allow.

### `describe_object`

- The name "describe_object" says "describe": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Los campos de un objeto que contesta la API (Invoice, Customer, Event, Error…), con su tipo y significado, y un ejemplo. Sin nombre, la lista de objetos.
```

### `describe_operation`

- The name "describe_operation" says "describe": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Todo sobre una operación: parámetros, cada campo del cuerpo (tipo, si es obligatorio, límites), ejemplos, el código con el SDK del lenguaje que elija y qué objeto contesta (sus campos con describe_object, o aquí con full).
```

### `get_page`

- The name "get_page" says "get": a word for reading.
- Tag private-data: The description's first sentence says "doc": it reads documents.

Description, as the server wrote it:

```untrusted-server-text
El texto completo (Markdown) de una página de la documentación, por su ruta, por ejemplo /docs/api/facturas o /docs/api/referencia/facturas/create-invoice.
```

### `list_operations`

- The name "list_operations" says "list": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Las operaciones de la API (operationId, método, ruta y qué hace), por sección. Úsela para encontrar la ruta correcta antes de describe_operation.
```

### `list_pages`

- The name "list_pages" says "list": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Todas las páginas de la documentación: guías y referencia, con su ruta y de qué tratan.
```

### `search_docs`

- The name "search_docs" says "search": a word for reading.
- Tag private-data: The name "search_docs" says "search" and "doc": it reads documents.

Description, as the server wrote it:

```untrusted-server-text
Busca en la documentación de la API de facturación de Fiscalisto (guías y referencia) y devuelve las páginas que más coinciden. Entiende español e inglés («cancelar factura», «verify webhook signature»). Úsela antes de escribir código contra la API.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `docs`:

```json
{
  "permissions": {
    "allow": [
      "mcp__docs__search_docs",
      "mcp__docs__get_page",
      "mcp__docs__list_operations",
      "mcp__docs__describe_operation",
      "mcp__docs__describe_object",
      "mcp__docs__list_pages"
    ],
    "ask": [
      "mcp__docs__get_started",
      "mcp__docs__explain_error",
      "mcp__docs__call_api"
    ],
    "deny": []
  }
}
```

Capability tags behind the rules (a read tagged outbound is asked about):

- `mcp__docs__search_docs`: private-data
- `mcp__docs__get_page`: private-data