# Brazil CNPJ company registry (remote · cnpj-mcp.fly.dev)

Brazil's open CNPJ registry: filter and count companies by sector, place, size, MEI, partners.

- Trust score: 62/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `cnpj-mcp.fly.dev`: 62/100 (this document), [markdown](https://verifymcp.io/servers/bnovarini-cnpj-mcp/cnpj-mcp.md), [page](https://verifymcp.io/servers/bnovarini-cnpj-mcp/cnpj-mcp)

## Channel facts

- Endpoint: `https://cnpj-mcp.fly.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## 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 2026-10-18.

- **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 8 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**: 55/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1917 tokens (~239/item across 8 items; 8 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**: 71/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
  - Structured output schemas are declared (50% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Brazil CNPJ company registry MCP server?

Brazil CNPJ company registry is a hosted endpoint at https://cnpj-mcp.fly.dev/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.

### Claude

```bash
claude mcp add --transport http bnovarini-cnpj-mcp 'https://cnpj-mcp.fly.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "bnovarini-cnpj-mcp": {
      "url": "https://cnpj-mcp.fly.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "bnovarini-cnpj-mcp": {
      "type": "http",
      "url": "https://cnpj-mcp.fly.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.bnovarini-cnpj-mcp]
url = "https://cnpj-mcp.fly.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "bnovarini-cnpj-mcp": {
      "type": "remote",
      "url": "https://cnpj-mcp.fly.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add bnovarini-cnpj-mcp --url 'https://cnpj-mcp.fly.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  bnovarini-cnpj-mcp:
    url: "https://cnpj-mcp.fly.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "bnovarini-cnpj-mcp": {
      "Transport": "http",
      "Url": "https://cnpj-mcp.fly.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add bnovarini-cnpj-mcp -t streamable-http -u 'https://cnpj-mcp.fly.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "bnovarini-cnpj-mcp": {
      "type": "http",
      "url": "https://cnpj-mcp.fly.dev/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.

### 2026-10-17 (score 62, +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.

### 2026-10-15 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-13 (score 60, +1)

- [security] Tool “search_companies” rewrote its description, which is the text the model reads

### 2026-10-12 (score 59, +1)

- [functional improvement] Stability: unverified → 0.07

### 2026-10-10 (score 58)

First indexed and scored.

## MCP tools (8)

### `dataset_info` (~36 tokens)

What data is loaded: source, snapshot month, row counts, field meanings and caveats. Call first if unsure what the tools cover.

### `search_companies` (~684 tokens)

Find companies/establishments matching filters. Filters (all optional, combined with AND): cnae (CNAE code or prefix, e.g. '4711' or '47', list ok; add include_secondary to also match secondary activities), cnae_secao (letter A-U), uf, municipio (name as in Receita, accents ignored), municipio_codigo, situacao (ativa, baixada, suspensa, inapta, nula), matriz_only, porte (micro = ME, pequeno = EPP, demais, nao_informado), natureza_juridica (code prefix like '2062' or text like 'sociedade limitada'), capital_min/capital_max (BRL), opened_from/opened_to (data_inicio_atividade, YYYY-MM or YYYY-MM-DD), closed_from/closed_to (data da baixa), mei, simples (true/false), name_contains (razao social or nome fantasia), cep, partner_name (a partner's name contains this text). Returns up to 100 rows per page, ordered by opening date (newest first) unless order_by is capital_social or razao_social. Use count_companies for 'how many' questions. Set include_contacts to add email, phones, full address and a registry_contact_quality block (0-100 score of how likely the REGISTERED email/phone from Receita is a real direct contact, with the signals behind it; it says nothing about the website) and, when the company's own website was crawled, a separate website_contacts block (WhatsApp, phones, emails, social profiles found on its public pages, each with source_url). A whatsapp_business block appears only when a WhatsApp Business account was found on one of the registered phones (display name, account type, name_match score, checked_at); phones are checked in the background after a query shows them, so a result can appear on a later call, and its absence says nothing about whether the number is on WhatsApp. min_contact_score keeps only companies whose REGISTERED contact (the email and phones on the Receita record, not the website) scores at or above it. Pass an integer 0-100, or a tier name: 'high' = 85, 'medium' = 50, 'low' = 0 (e.g. min_contact_score=50 or 'medium' for medium and hig…

Input parameters:

- `capital_max`
- `capital_min`
- `cep`
- `closed_from`
- `closed_to`
- `cnae`
- `cnae_secao`
- `include_contacts` (boolean)
- `include_secondary` (boolean)
- `limit` (integer)
- `matriz_only` (boolean)
- `mei`
- `min_contact_score`
- `municipio`
- `municipio_codigo`
- `name_contains`
- `natureza_juridica`
- `offset` (integer)
- `opened_from`
- `opened_to`
- `order_by` (string)
- `partner_name`
- `porte`
- `simples`
- `situacao`
- `uf`

### `count_companies` (~509 tokens)

Count companies or establishments, optionally grouped by one or two fields. Filters (all optional, combined with AND): cnae (CNAE code or prefix, e.g. '4711' or '47', list ok; add include_secondary to also match secondary activities), cnae_secao (letter A-U), uf, municipio (name as in Receita, accents ignored), municipio_codigo, situacao (ativa, baixada, suspensa, inapta, nula), matriz_only, porte (micro = ME, pequeno = EPP, demais, nao_informado), natureza_juridica (code prefix like '2062' or text like 'sociedade limitada'), capital_min/capital_max (BRL), opened_from/opened_to (data_inicio_atividade, YYYY-MM or YYYY-MM-DD), closed_from/closed_to (data da baixa), mei, simples (true/false), name_contains (razao social or nome fantasia), cep, partner_name (a partner's name contains this text). group_by options: uf, municipio, cnae_principal, cnae_divisao, cnae_secao, natureza_juridica, porte, situacao, ano_abertura, mes_abertura, ano_baixa, mes_baixa, mei, simples, matriz_filial, motivo_situacao. unit='estabelecimentos' (default) counts every CNPJ incl. filiais; unit='empresas' counts companies (matriz only). metric='sum_capital' sums declared capital social (BRL, companies only). Examples: MEIs opened per month in a state, active agro companies per municipality, closures by year.

Input parameters:

- `capital_max`
- `capital_min`
- `cep`
- `closed_from`
- `closed_to`
- `cnae`
- `cnae_secao`
- `group_by`
- `include_secondary` (boolean)
- `limit` (integer)
- `matriz_only` (boolean)
- `mei`
- `metric` (string)
- `municipio`
- `municipio_codigo`
- `name_contains`
- `natureza_juridica`
- `opened_from`
- `opened_to`
- `order` (string)
- `partner_name`
- `porte`
- `simples`
- `situacao`
- `uf`
- `unit` (string)

Output parameters:

- `result` (array)

### `get_company` (~73 tokens)

One company by CNPJ (14 digits, with or without punctuation; or the 8-digit root to get the matriz): registration, company data, Simples/MEI, address and contacts, secondary CNAEs, partners (with names), and how many establishments the company has.

Input parameters:

- `cnpj` (string, required)

### `list_partners` (~137 tokens)

Partners (socios) of one company by CNPJ root or full CNPJ: names, type, role (qualificacao), entry date, age band. CPFs are masked by Receita. faixa_etaria: 1 = 0-12, 2 = 13-20, 3 = 21-30, 4 = 31-40, 5 = 41-50, 6 = 51-60, 7 = 61-70, 8 = 71-80, 9 = over 80, 0 = not applicable.

Input parameters:

- `cnpj` (string, required)

Output parameters:

- `result` (array)

### `search_partners` (~128 tokens)

Find the companies a person or entity is a partner of, by name. Exact (accent-insensitive, case-insensitive) match on the partner name by default; set contains=true for a substring match. Optionally narrow with cpf_middle (the 6 digits Receita publishes, e.g. '240659') because the same name can belong to different people. Returns company name, status and role.

Input parameters:

- `contains` (boolean)
- `cpf_middle`
- `limit` (integer)
- `name` (string, required)
- `offset` (integer)
- `uf`

### `companies_at_address` (~90 tokens)

Establishments registered at one address, by CEP (8 digits), optionally narrowed by street text, number, municipio or uf. Use it to find companies sharing an address.

Input parameters:

- `cep`
- `limit` (integer)
- `logradouro_contains`
- `municipio`
- `numero`
- `offset` (integer)
- `situacao`
- `uf`

Output parameters:

- `result` (array)

### `lookup_codes` (~93 tokens)

Look up Receita's code tables by text or code. kind: cnae (activity), natureza_juridica (legal form), municipio, motivo (reason for status), qualificacao (partner role), pais. Use it to find the CNAE code for a sector, or the municipio name Receita uses, before filtering.

Input parameters:

- `kind` (string, required)
- `limit` (integer)
- `text` (string, required)

Output parameters:

- `result` (array)

## Diagnostics

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

## Score history

- 2026-10-18: 62
- 2026-10-17: 62
- 2026-10-16: 61
- 2026-10-15: 61
- 2026-10-14: 60
- 2026-10-13: 60
- 2026-10-12: 59
- 2026-10-10: 58

## Common questions

### What is the Brazil CNPJ company registry MCP server?

Brazil CNPJ company registry is an MCP server listed in the public MCP registry as io.github.bnovarini/cnpj-mcp. Brazil's open CNPJ registry: filter and count companies by sector, place, size, MEI, partners. This page covers its hosted endpoint (https://cnpj-mcp.fly.dev/mcp).

### Is the Brazil CNPJ company registry MCP server safe to use?

Brazil CNPJ company registry scores 62 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 Brazil CNPJ company registry MCP server expose?

Brazil CNPJ company registry exposes 8 tools: dataset_info, search_companies, count_companies, get_company, list_partners, and 3 more. Their descriptions and schemas cost roughly 1,750 tokens of context every time the server is loaded.

### Does the Brazil CNPJ company registry MCP server require authentication?

No. We connected to Brazil CNPJ company registry without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Brazil CNPJ company registry MCP server still maintained?

Brazil CNPJ company registry is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://cnpj-mcp.fly.dev/mcp
- Repository: https://github.com/bnovarini/cnpj-mcp
- Changelog RSS feed: https://verifymcp.io/servers/bnovarini-cnpj-mcp/cnpj-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/bnovarini-cnpj-mcp/cnpj-mcp.json
- HTML version of this page: https://verifymcp.io/servers/bnovarini-cnpj-mcp/cnpj-mcp