FrankKi

The agentic layer of letters.

CommunityDegradedNo sign-inGlobalFreeCan modify data

What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    The agentic layer of letters. Agents send real printed mail worldwide, German compliance built in.

    How to connect

    How to connect FrankKi to Claude

    The server address to paste into Claude settings:

    https://mcp.frankki.app

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect FrankKi to ChatGPT

    The server address to paste into ChatGPT settings:

    https://mcp.frankki.app

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect FrankKi to Cursor

    The server address to paste into Cursor settings:

    https://mcp.frankki.app

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (4)

    Raw names from tools/list. Only developers need these.

    mcp_healthHealth-/Echo-Probe - prüft das Partner-Token und die Verarbeitungskette von Anfang bis Ende und sagt dir unter setup, welche Voraussetzungen für einen echten Versand schon erfüllt sind (Absender-Profil, AVV, Guthaben, Sandbox, Freigabe) und was der nächste Schritt ist. Mit checkRender: true wird zusätzlich geprüft, ob gerade überhaupt gerendert werden kann (Vorschau, Thumbnail). Rufe das auf, bevor du eine Vorlage baust, die du danach ansehen musst. EN: Health/echo probe - verifies the partner token and the chain end to end, and reports under setup which prerequisites for a real send are already met (sender profile, data processing agreement, balance, sandbox, approval) and what the next step is. With checkRender: true it additionally checks whether rendering currently works at all (preview, thumbnail). Call it before building a template you will need to look at.
    address_validatePrüft eine Adresse anhand landesspezifischer Regeln und meldet harte Fehler als ADDRESS_INVALID. Nur eine Prüfung, das Adressbuch bleibt unverändert; zum Anlegen oder Ändern einer Adresse nimm address_upsert. EN: Validates an address using country-specific rules and reports hard failures as ADDRESS_INVALID. A check only, the address book is left untouched; to create or change an address use address_upsert.
    shipping_quoteRegistered-mail availability depends on the destination and its current catalog, not a Germany-only rule. The codes einschreiben_einwurf and einschreiben_uebergabe are German products; Switzerland uses ch_einschreiben. For other destinations, use only methods returned in availableDeliveryTypes by a standard shipping_quote for that country, then quote the chosen code. A rejected country/method pair does not establish availability in other countries. A catalog snapshot with no registered method does not prove that the postal service never offers one. Tracked mail is not registered mail. Never substitute standard or tracked delivery when registered mail was requested without the user's agreement. A carrier-issued proof-of-posting PDF is not promised. Reply in the user's conversation language, regardless of recipient country, letter language, German tool titles or bilingual tool results. Translate shipping methods, letter formats, delivery estimates and explanations for the user. In English: Standardbrief = standard letter; Kompaktbrief = compact letter; Großbrief = large letter; Maxibrief = maxi letter; Einschreiben = registered mail; Einwurf-Einschreiben = registered mail with recorded mailbox delivery; Übergabe-Einschreiben = registered mail with signature on delivery; Einlieferungsbeleg = proof of posting. Use localized money and number formatting. Keep tool names, parameter names, deliveryType values and error codes unchanged in tool calls; show codes to users only when needed for troubleshooting. This presentation rule does not translate the letter's contents. Ermittelt den Preis, das Briefformat, die Versandart und die voraussichtliche Laufzeit für einen geplanten Brief, bevor er versendet wird. Das ist die Schätzung für den Fall, dass der Brief erst geplant ist: du gibst nur Seitenzahl, Land und Versandart an. Steht der Brief schon fest, versendest du ihn mit order_send (order_send mit dryRun:true liefert dann den genaueren Preis für genau diesen Brief). Der Pre
    pricing_tiersLiefert die Staffelpreise (Mengenrabatte) von FrankKi: ab welcher Monatsmenge welcher Beispielpreis pro Brief gilt. Nutze das, wenn jemand nach Mengenrabatt, Volumenpreis, Staffelpreis oder Großkundenpreis fragt. Die Beispielpreise gelten für einen einseitigen Standardbrief in Schwarzweiß innerhalb Deutschlands, der echte Preis pro Brief hängt zusätzlich von Seitenzahl, Farbe, Versandart und Zielland ab (dafür shipping_quote). EN: Returns FrankKi's volume tiers (bulk discounts): from which monthly quantity which example price per letter applies. Use this when someone asks about bulk discounts, volume pricing or enterprise pricing. The example prices are for a one-page black and white standard letter within Germany; the real per-letter price also depends on page count, color, delivery type and destination country (use shipping_quote for that).