LetterPostcardAddress Book

PieterPost WebMCP for browser-based AI agents

Ask your AI agent to send real mail from this page.

Tell your agent what to send and to whom, from a quick note to a fully designed letter. Your agent prepares everything on PieterPost, you approve the payment, and we print and mail it. No PieterPost connector setup is needed.

Try WebMCP on PieterPostSee the PieterPost MCP connector
How an AI agent sends a designed letter with PieterPost WebMCPYou ask your agent for a letter. On pieterpost.com the agent opens the letter designer, starts from a template, adds the heading, checks a print preview, adds the recipient and prepares the order. You approve the payment by link, or your agent pays, and PieterPost prints, stamps and mails the letter.You“Design a thank-you letter for my customers,show me a preview, and get it mailed.”pieterpost.com/en/designerYOUR AGENT CALLSThank you, {{first_name}}!Print preview ✓open_letter_designerdesigner_new_documentdesigner_update_elementdesigner_render_previewdesigner_set_recipientsdesigner_prepare_orderOrder ready · payment link or MPPYou approve paymentBy link, or your agent pays→Printed and mailedStamped by PieterPost

Where you can use it

Start with a browser that can discover PieterPost's WebMCP tools.

Codex in the ChatGPT desktop browserAvailable nowSite tools are discovered automatically when your account and selected model support them.Google Chrome 149ExperimentalAvailable in Chrome 149 and later when the WebMCP testing flag is turned on.

WebMCP is an open standard, so more browsers and agents can add support over time.

How it works

WebMCP lets a supporting AI agent use the useful actions on a website. You ask for the result. The agent handles the steps with PieterPost.

  1. 1

    Open PieterPost

    Visit PieterPost in a WebMCP-ready browser. Your agent sees PieterPost's mail tools on the page automatically.

  2. 2

    Ask in your own words

    Say what you want sent and to whom: a quick note, a PDF, a postcard, or a fully designed letter for up to 50 people.

  3. 3

    Your agent does the work

    Your agent writes or designs the letter, adds the addresses, checks the price, and for designed letters shows you a print preview.

  4. 4

    Approve and pay

    You approve the order. Pay through a secure PieterPost payment link, or let a compatible agent pay with its approved payment method.

  5. 5

    We send the mail

    PieterPost prints, stamps, and mails the order. Ask your agent for its status at any time.

Pay in the way your agent supports

Nothing is printed until the order is paid. Only the last step changes.

Agent payment available

A compatible agent can pay PieterPost with its approved payment method and finish the order in the conversation, for quick and designed letters alike.

No agent payment available

Your agent gives you a secure PieterPost payment link. Pay there and the prepared mail is sent without starting again.

Two ways to send a letter

Your agent picks the right one from what you ask. In both, nothing is printed until the order is paid.

Quick letters and postcards

Available on every PieterPost page. Your agent sends your exact text on a standard PieterPost letter, a PDF you already have, or a postcard with your photo.

Best for personal notes, documents, and postcards.

prepare_letter, prepare_postcard

Designed letters

Your agent opens the letter designer and builds the page with you: layout, logo and photos, colours, templates, personal details for each recipient, A4 or US Letter, and a print preview before payment.

Best for branded letters, invitations, and mailings to many people.

open_letter_designer, designer_* tools, designer_prepare_order

Open the letter designer

What you can ask

You do not need special commands. Start with the outcome that you want.

Quick letter

“Write my grandmother a short letter thanking her for the birthday present and send it to Anna Visser, Dorpsstraat 12, 1135 AB Edam, Netherlands.”

Quick letter

“Mail this signed contract PDF to Acme B.V., Postbus 100, 3500 AA Utrecht, Netherlands. Tell me the price before you create the payment link.”

Postcard

“Send Emma a birthday postcard with this photo on the front that says ‘Happy 30th, Emma! Can’t wait to celebrate.’”

Designed letter

“Design a thank-you letter with our logo that greets each customer by first name, and send it to the 12 customers in this list.”

Designed letter

“Make a US Letter invitation for our open day on 12 October with a QR code to our RSVP page. Show me a print preview before you order anything.”

Order status

“Has my letter to Anna been paid and sent yet?”

WebMCP or the PieterPost MCP connector?

Both let an AI agent work with PieterPost. Choose where you want to use it.

Choose WebMCP

Use PieterPost through a supporting agent while the website is open. It is ideal for a quick letter or postcard, with no PieterPost connector setup.

Choose PieterPost MCP

Connect PieterPost to your AI platform once, then use it from other conversations and work with your PieterPost account and Address Book contacts.

Explore the PieterPost MCP connector

Built for the agentic web

WebMCP is an open web standard for clear, reliable actions between websites and AI agents. These primary sources explain the standard and its payment layer.

PieterPost WebMCP on GitHubExplore PieterPost's open-source browser integration and tool contracts.OpenAI site tools guideSee how site tools work in the ChatGPT desktop app's built-in browser.Chrome WebMCP guideSee how browser-based AI agents discover and use website actions.WebMCP standard draftRead the open standard that defines WebMCP for websites and agents.Machine Payments ProtocolLearn how compatible agents can complete payments through a common web protocol.

Ready to send real mail with your agent?

Open PieterPost and ask for a letter or postcard in your own words.

Open PieterPost