FrankKi MCP server
online · 100% uptimeapp.frankki/letters·v1.0.0·1 starsThe agentic layer of letters. Agents send real printed mail worldwide, German compliance built in.
1 stars
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FrankKi tools (4)
write = sends, deletes, buys or postsaddress_validateFreePrüft 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.
mcp_healthFreeHealth-/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.
pricing_tiersFreeLiefert 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).
shipping_quoteFreeRegistered-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 Preis gilt pro Brief und enthält bereits die Mengenstaffel des Partners, falls eine greift (Feld tierId). Für die Staffelpreise selbst nutze pricing_tiers. EN: Determines the price, letter format, shipping method and estimated delivery time for a planned letter, before it is sent. This is the estimate for when the letter is still only planned: you only supply page count, country and delivery type. Once the letter exists, order_send performs the actual send (and order_send with dryRun:true gives the more precise price for that specific letter). The price is per letter and already includes the partner's volume tier where one applies (field tierId). For the volume tiers themselves, call pricing_tiers.
Public scan report
scanner v0.1.9 · 2026-09-24 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 1504ms20/20
- Tool poisoning4 tool descriptions checked13/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenancelast push 13 days ago15/15
- Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10
Findings (1)
- lowUnusually long tool description (over 2,000 characters)
poison.long-descriptiontool shipping_quote: …Registered-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 Preis gilt pro Brief und enthält bereits die Mengenstaffel des Partners, falls eine greift (Feld tierId). Für die Staffelpreise selbst nutze pricing_tiers. EN: Determines the price, letter format, shipping method and estimated delivery time for a planned letter, before it is sent. This is the estimate for when the letter is still only planned: you only supply page count, country and delivery type. Once the letter exists, order_send performs the actual send (and order_send with dryRun:true gives the more precise price for that specific letter). The price is per letter and already includes the partner's volume tier where one applies (field tierId). For the volume tiers themselves, call pricing_tiers.…
How FrankKi compares
Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 87/100
- higher than 73% of 48,255 servers
- Tools
- 4
- the typical server has 7
- Tools that change things
- 0%
- typical: 0%. Fewer write tools means less an agent can break
- Uptime
- 100%
- of our recent checks; the typical remote server answers 100%
- Response time
- 703 ms
- faster than 19% of 30,031 servers
- GitHub stars
- 1
- more than 65% of 28,688 servers
What its tools let an agent do: 3 read · 1 create
Install FrankKi in Claude Code, Cursor or VS Code
claude mcp add --transport http letters https://mcp.frankki.app
What the publisher says
From the FrankKi repository's README, as published. We do not edit it. Read it on GitHub
<!-- Repo: frankki-mcp | Homepage: https://frankki.app/mcp | Topics: mcp, mcp-server, claude, ai-agents, physical-mail, letters -->
FrankKi MCP
Hosted, remote MCP server. Nothing to install, nothing to self-host. Point your agent at https://mcp.frankki.app (remote, streamable-http, OAuth 2.1 or API key). This repository is the public manifest, documentation and changelog for that server; the server itself is closed-source and runs on our own infrastructure, which is why there is no src/ directory here.
Physical mail for AI agents. With one tool call, FrankKi MCP lets an agent send a real, printed letter to a physical address anywhere in the world. Compose, price, send, and track. The document is printed, franked, and delivered by postal partners worldwide.
This is the official Model Context Protocol (MCP) server for FrankKi. It is built for B2B and developer use: give your agents, backends, and automated workflows the ability to put real letters in the mail, at scale, worldwide.
Website: frankki.app · MCP for humans and agents: frankki.app/mcp (English: frankki.app/en/mcp)
Contents
- What is FrankKi MCP?
- Why physical mail via MCP?
- What your agent can do
- Quick start for humans
- Quick start for AI agents
- Authentication
- Wallet and pricing
- Safety and human-in-the-loop
- Sandbox
- Compliance
- How a send actually works
- Discovery and server manifest
What is FrankKi MCP?
FrankKi MCP is the agent-native interface to FrankKi's physical mail infrastructure. FrankKi composes, prints, and physically mails letters. This server exposes that capability to software: your model drafts a letter and sends it, and a real document arrives at the recipient's address.
Delivery is worldwide, handled by our postal partners in each destination country. It is primarily a B2B 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.
Why physical mail via MCP?
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.
Typical uses:
- 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
What your agent can do
The server exposes a focused, scoped tool set. The core send flow:
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
FrankKi: common questions
- Is FrankKi MCP server safe?
- Yes, by our scan: it is graded A (87/100). Read the FrankKi safety report
- How do I install FrankKi?
- It runs remotely at mcp.frankki.app. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does FrankKi need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is FrankKi maintained?
- The last commit was 54 days ago (2026-09-11). The latest release is v1.0.0.
- Is FrankKi up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- How does FrankKi compare with other MCP servers?
- safety score 87/100 (higher than 73% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.