# Issue Brazilian invoices from Claude with an MCP server (and a human approval step)

> Source: <https://dev.to/cendyandreoli/issue-brazilian-invoices-from-claude-with-an-mcp-server-and-a-human-approval-step-edi>
> Published: 2026-11-09 20:19:34+00:00

Brazilian service invoices (NFS-e) are issued per city or through a national system, and every field is checked by tax authorities. SendNF exposes this as an API and as an MCP server, so an AI agent can look up a company by CNPJ, preview an invoice and issue it.

**What you need**

`nt_test_` are sandbox keys (no tax value). `nt_live_` keys issue real invoices.
**Configure**

```
{
  "mcpServers": {
    "sendnf": {
      "type": "http",
      "url": "https://api.sendnf.com/mcp",
      "headers": { "Authorization": "Bearer nt_test_YOUR_KEY" }
    }
  }
}
```

The server uses Streamable HTTP, with no session. Without a key it answers 401.

**What the agent can do (44 tools)**

`lookup_cnpj` (public data from the tax authority, and which city system applies), `search_service_codes` (national service list, LC 116, with NBS), `check_readiness` (what is still missing for a company), `validate_dps` (checks a DPS XML against the official layout; it does not guarantee acceptance by the city).`preview_nfse`, `preview_nfce`, `preview_nfe`.` issue_nfse`, `issue_nfce`, `issue_nfe`, and `cancel_document`.
**The human approval step**

By default, any key used through MCP requires approval. `create_note_draft` builds the invoice, validates it and leaves it as `pending_approval` with a PDF preview. Nothing goes to the tax authority until a person approves in the dashboard or through the approver link. Approval expires in 7 days, and the audit log records who approved, when and from which IP.

**Limits**

The repository [https://github.com/sendnf/sendnf-mcp](https://github.com/sendnf/sendnf-mcp) has the manifest, examples and tool list; the product code is private. SendNF issues NFS-e, NFC-e and NF-e (model 55) for MEI and Simples Nacional; it does not issue CT-e or MDF-e. Docs: [https://sendnf.com/mcp/](https://sendnf.com/mcp/) . Plans and prices: [https://sendnf.com/precos/](https://sendnf.com/precos/) .