# MDN MCP: Use MDN in Slack and Email

Source: https://maito.app/integrations/mdn

Connect the MDN MCP server to Maito in one click, and your whole team can use it from Slack or email: “Does Safari support the CSS :has() selector?”

MDN is the reference for web docs and browser compatibility data. Connect the MDN MCP server to Maito once, and everyone on your team can use MDN from Slack, by email, or from Claude, ChatGPT, Cursor, Codex, Grok or Muse. Nobody else has to sign in.

-   Connects in one click
-   No sign-in needed
-   One connection for the whole team
-   Server by [Mozilla](https://developer.mozilla.org/)

Updated October 21, 2026

## What you can ask with MDN

Requests to Maito

![Dana](https://maito.app/marketing-avatars/dana.webp)

Dana in Slack

Does Safari support the CSS :has() selector?

![Sam](https://maito.app/marketing-avatars/sam.webp)

Sam by email

What does MDN say about the difference between fetch keepalive and sendBeacon?

Maito uses MDN to do the work and replies where you asked.

## How to connect MDN

Open Connections in your workspace and choose Connect next to MDN. It needs no separate sign-in: choose Connect and it's ready. Name the account and choose Workspace under who can use it. That's the only time anyone signs in: your whole team, shared chats and Loops can use MDN from then on. Or skip ahead and ask for the work: Maito sends you a link if MDN isn't connected yet.

## Questions

### What is the MDN MCP server URL?

Mozilla publishes it at https://mcp.mdn.mozilla.net/, and it needs no sign-in.

### Can I use the MDN MCP server from Slack?

Yes. Connect it to Maito once, then mention Maito in any Slack channel or send it a direct message. The same connection works by email and from Claude, ChatGPT, Cursor, Codex, Grok or Muse.

### Does everyone on my team have to connect MDN?

No. One person connects it once and chooses Workspace. Then everyone in the workspace, shared chats and Loops can use MDN, without signing in themselves. Choose Only me instead to keep it to your own chats.

### Do I have to connect MDN before I ask?

No. If a request needs MDN and it isn't connected yet, your agent sends you a link. Connect it, and the work picks up where it stopped.

### Can I limit what Maito does in MDN?

Yes. After you connect, turn off any MDN tools you don't want Maito to use, such as the ones that change data. Tools MDN adds later stay off until you turn them on.

## Also in Developer tools

-   [Supabase Supabase is a Postgres database with authentication and storage.](https://maito.app/integrations/supabase)
-   [GitHub GitHub hosts your code: repositories, pull requests, issues and Actions.](https://maito.app/integrations/github)
-   [GitLab GitLab hosts your code: projects, issues, merge requests and CI/CD.](https://maito.app/integrations/gitlab)
-   [Lovable Lovable builds web apps from prompts, then lets you inspect and deploy them.](https://maito.app/integrations/lovable)
-   [Postman Postman holds your API collections, environments and docs.](https://maito.app/integrations/postman)
-   [Context7 Context7 has current documentation for popular code libraries.](https://maito.app/integrations/context7)

[See all integrations](https://maito.app/integrations)

## Put your AI employee to work.

Set it up in minutes. Connect MDN, then hand Maito the first job.

[Put Maito to work](https://maito.app/login?returnTo=%2Fintegrations%2Fmdn)[Book a demo](https://cal.com/ddubovetzky/chat-with-the-founder)