io.github.cmendezs/mcp-nfe-br

What we checked

Six static checks, weighted by risk. Every result reflects only what could be observed in the published package and repository — never intent.

• Injection surface

  unscannable25% of grade

  Tool descriptions/manifest scanned for instruction-injection patterns (imperatives at the model, hidden text, 'ignore previous', data-exfil URLs).

  No tool descriptions, server instructions, prompts, or resources were fetched; nothing to scan for injection.

• Supply chain

  pass25% of grade

  Package provenance: namespace verification, repo linkage, maintainer count, account age, postinstall scripts, typosquat distance.

  Python build script has no build-time network/exec; repository linkage verified

• Credential hygiene

  warn15% of grade

  How the server takes secrets (env vs plaintext config vs hardcoded); secrets appearing in tool schemas.

  tests/test_standards/test_adn_client.py: assigns a literal to secret (SUPE…45 (len 24)) — non-provider secret literal; prefer environment intake. tests/test_tools/test_nfse.py: assigns a literal to secret (GOVB…AK (len 26)) — non-provider secret literal; prefer environment intake. Reads secrets from the environment (e.g. tests/test_standards/test_adn_e2e.py) — the recommended intake shape.

• Permission scope

  pass15% of grade

  Declared tools vs. breadth (filesystem, network, exec); flags shell-exec and unbounded filesystem access.

  No shell-exec, unbounded/sensitive filesystem, or download-and-run primitives found in scanned source. PASS = no static red flag. Static scanning is blind to code fetched or executed at runtime.

• Version behavior

  fail10% of grade

  Diff of tool definitions between versions; new permissions or changed descriptions in a patch release (the postmark-mcp class).

  vs prior 0.8.1 (minor bump): new capability primitive(s) in source: http-client; new hardcoded outbound host/BCC destination(s): 127.0.0.1, adn-hom.estaleiro.serpro.gov.br, adn.estaleiro.serpro.gov.br, cmendezs.github.io, custom.endpoint.example, dfe-portal.svrs.rs.gov.br, example.com, github.com, hnfe.fazenda.mg.gov.br, hnfe.sefaz.ba.gov.br, hom.sefazvirtual.fazenda.gov.br, hom1.nfe.fazenda.gov.br, homnfe.sefaz.am.gov.br, homolog.example, homologacao.nfe.fazenda.ms.gov.br, homologacao.nfe.fazenda.pr.gov.br, homologacao.nfe.fazenda.sp.gov.br, homologacao.nfe.sefaz.go.gov.br, homologacao.sefaz.mt.gov.br, nfe-homologacao.svrs.rs.gov.br, nfe.fazenda.mg.gov.br, nfe.fazenda.ms.gov.br, nfe.fazenda.pr.gov.br, nfe.fazenda.sp.gov.br, nfe.sefaz.am.gov.br, nfe.sefaz.ba.gov.br, nfe.sefaz.ce.gov.br, nfe.sefaz.go.gov.br, nfe.sefaz.mt.gov.br, nfe.sefaz.pe.gov.br, nfe.svrs.rs.gov.br, nfeh.sefaz.ce.gov.br, nfehomolog.sefaz.pe.gov.br, nonexistent.example.com, pypi.org, raw.githubusercontent.com, registry.modelcontextprotocol.io, sso.acesso.gov.br, sso.staging.acesso.gov.br, www.nfe.fazenda.gov.br, www.portalfiscal.inf.br, www.sefazvirtual.fazenda.gov.br, www.sped.fazenda.gov.br, www.w3.org, www1.nfe.fazenda.gov.br.

• Transport config

  warn10% of grade

  Remote servers: TLS and auth mode (none/token/OAuth). Local servers: whether the manifest indicates it phones home.

  manifest/source references tracking behavior — disclosure