FrankKi

Delivery isworldwide, handled by our postal partners in each destination country. It is primarily aB2B and developer product: if you are building an assistant, an ops automation, or a backend that needs to produce and dispatch physical correspondence, this is your physical-output layer.

Some things still have to arrive on paper: formal and legal notices, transactional and compliance mail, contract confirmations, dunning and reminders, customer onboarding, official correspondence. These workflows usually dead-end at "now a human prints this and walks to a postbox." FrankKi MCP removes that step. The same agent that drafts the letter can send it, worldwide, and track delivery.

- Dunning and payment reminders
- Cancellations, terminations, objections, and other formal notices
- Contract and order confirmations
- Customer and account notifications
- Onboarding and welcome letters
- Any workflow whose last step must be a physical letter

The server exposes a focused, scoped tool set. The core send flow:

Composition is text-first: you provide the letter content and the recipient, and FrankKi produces the correctly laid-out document (DIN 5008 by default). Attachments are supported. Sending a pre-rendered arbitrary PDF is intentionally not part of the platform.

You do not clone or self-host anything. The FrankKi MCP server is hosted. You point your MCP client at it and authenticate.

2a. Claude Desktop and clients with native remote support.Add a custom connector pointing at the endpoint. OAuth runs in your browser on first use:

{ "mcpServers": { "frankki": { "url": "https://mcp.frankki.app" } } }

2b. Clients that only speak stdio(older Claude Desktop, some Cursor setups). Bridge withmcp-remote:

The server is standardstreamable HTTPMCP. Discovery, endpoint, and auth in one place:

- Endpoint:https://mcp.frankki.app
- Registry name:app.frankki/letters(published in the Official MCP Registry, version 1.0.0)
- Auth metadata:https://mcp.frankki.app/.well-known/oauth-authorization-server(OAuth 2.1, dynamic client registration) or a static bearer API key
- Machine-readable overview:https://frankki.app/llms.txt

import { Client } from "@modelcontextprotocol/sdk/client/index.js"; import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js"; const transport = new StreamableHTTPClientTransport( new URL("https://mcp.frankki.app"), { requestInit: { headers: { Authorization: Bearer ${process.env.FRANKKI_API_KEY} } } } ); const client = new Client({ name: "my-agent", version: "1.0.0" }); await client.connect(transport); const { tools } = await client.listTools(); console.log(tools.map((t) => t.name)); const price = await client.callTool({ name: "shipping_quote", arguments: { recipientCountry: "US", deliveryType: "standard" }, });

Is the letter really printed and mailed, or is it email?Real paper. It is printed, franked, and delivered by postal partners. This is not email.

Which countries can it deliver to?Worldwide. Useshipping_quoteto confirm reach and cost for a specific destination.

Do I host the server?No. FrankKi hosts it. This repo is documentation,server.json, and examples. You connect a client or agent to the hosted endpoint.

Is this for consumers or businesses?Primarily B2B and developer use: agents, backends, and automated workflows that need to dispatch physical mail at scale.

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