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MaFactureOK MCP server

Which MCP servers are MaFactureOK's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-22

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Whose server it is
  • Registry namecom.mafactureok/mafactureokverified in the MCP registry

The registry name sits under mafactureok.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-22
  • Stateanswerschecked 2026-10-22
  • Tools4
  • Server calls itselfmafactureok
  • Server version1.1.0
  • Protocol version2025-06-18

On 2026-10-22 the server answered initialize and tools/list without a sign-in. First answer in 204 ms.

Should an agent connect itConnect it
  • Its tools do every use case we checked: Check a received e-invoice for French format compliance; Confirm a supplier's SIREN or VAT number is active; Confirm a client is active before issuing an invoice.

Once connected

  • For "Check a received e-invoice for French format compliance", the likely first call is valider_facture.
  • For "Confirm a supplier's SIREN or VAT number is active", the likely first call is verifier_tiers.
  • For "Confirm a client is active before issuing an invoice", the likely first call is verifier_tiers.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 7, the first on 2026-10-22
  • INITE MCP score100 of 100answers 100 · does the job 100 · definitions 100 · context 100 · connects 100
  • What an agent can do with it3 of 3 use cases
  • Answered100% of days7 of 7 daily checks
  • Median first answer711 ms
  • Space in an agent's context≈ 679 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · Check a received e-invoice for French format compliance
  • can do · Confirm a supplier's SIREN or VAT number is active
  • can do · Confirm a client is active before issuing an invoice

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-22
  • verifier_tiers

    Vérifie un ou plusieurs SIREN (9 chiffres) ou SIRET (14 chiffres) au registre officiel des entreprises et auprès de VIES : existe-t-elle, est-elle active ou cessée, sous quel nom et à quelle adresse, son numéro de TVA est-il valide. À…

  • verifier_tva

    Vérifie un numéro de TVA intracommunautaire français (FR + 2 caractères + 9 chiffres) : clé de contrôle, validité auprès du service européen VIES, et entreprise associée au registre officiel (nom, adresse, active ou cessée). Numéros…

  • valider_facture

    Ouvre une carte de dépôt dans la conversation. L'utilisateur y glisse sa facture électronique (PDF Factur-X, XML UBL ou CII, 15 Mo au maximum) ; le fichier est envoyé directement à MaFactureOK, analysé puis effacé, et la carte affiche le…

  • expliquer_code_rejet

    Traduit en clair un motif de rejet ou de refus de facture électronique (codes AFNOR XP Z12-012 : REJ_SEMAN, REJ_ADR, DEST_INC, NON_TRANSMISE, TX_TVA_ERR…) ou une règle de validation EN 16931 / française (BR-CO-15, BR-FR-10, BR-S-08…)…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "mafactureok": {
      "type": "http",
      "url": "https://mafactureok.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http mafactureok https://mafactureok.com/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mafactureok.com/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.