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Your first app on Haechy

Add Haechy to Claude as a custom connector with the address https://mcp.haechy.com/mcp. The sign-in window that opens is where you create your account, with an email link and a code sent to your phone. Then ask Claude to put your app online: it creates the app, deploys it and tells you where it lives.

Pick the way you use Claude

  • claude.ai in the browserOpen Customize > Connectors, choose "+ Add" then "Add custom connector", and paste the address.
  • Claude DesktopUses the connectors on your Claude account, so one setup covers it.
  • Claude CodeOne command: claude mcp add --transport http haechy https://mcp.haechy.com/mcp.

Whichever you use, the name can be "Haechy" and sign-in is by OAuth, so there is no key or secret to copy.

What to say first

Describe the app you want online, or point Claude at the one you already have. Claude starts with get_started, which reports your account, plan and usage against the limits, then calls create_app, deploy_app and get_deploy. If your phone check isn't finished, get_started gives Claude a link to console.haechy.com/onboarding/phone to pass on to you.

Example conversation Claude, with the Haechy connector

  1. You

    Put my team's stock-count app online with Haechy.

  2. Tool

    get_startedDone

    Account active, Free plan. Apps 0/2. Next: create an app, then deploy it.

  3. Tool

    create_appstock-countDone

    Created at stock-count.haechy.app. Access: private.

  4. Tool

    deploy_appDone

    Deploy started. Check progress with get_deploy in about 20 seconds.

  5. Tool

    get_deployIn progress

    Building. Check again in about 20 seconds.

  6. Tool

    get_deployDone

    Live.

  7. Claude

    It's live at stock-count.haechy.app. Only you can open it for now.

Example. Your wording and Claude's will differ, and the address is yours to choose (your-name.haechy.app).

An app's name can be up to 80 characters. Its address uses a slug of 3 to 30 lowercase letters, digits and hyphens. If you don't pick a region, the app goes in your account's default region, which is suggested from your phone number's country. Every new app starts private.

Signing up in the sign-in window

When you connect, Claude opens Haechy's console to sign in. Enter your email and Haechy sends you a sign-in link. It works once and expires after 15 minutes. Opening it shows a confirm button first, so a mail scanner that previews links can't use it up. Then Haechy texts a code to your mobile number, and your account becomes active once you enter it. Last comes a page saying Claude "wants to manage your Haechy apps"; choose Allow to finish connecting.

Haechy is available in the US, Canada, the UK, the EU and EEA, Switzerland, Australia and New Zealand. We're starting with the places where we can support billing, tax and local rules properly. Sign-up asks for a mobile number from one of these countries; we use it to keep spam and abuse off Haechy.

The number has to come from one of those countries. Internet (VoIP) numbers and numbers whose type can't be identified are refused, and a number that is already on another account can't be used again. Known disposable email domains are refused too. Haechy allows up to three codes per hour for one account or number.

What the deploy check can stop

Before building, Haechy scans the uploaded code. It stops the deploy if a key or password is written into a file, or if a .env file is in the upload (files named example, sample or template are fine). get_deploy tells Claude the file and line for each finding. Claude moves the value into the app's settings and deploys again, so you rarely need to act.

Deploy progress runs through pending, uploaded, building, scanning, starting and live. A deploy marked blocked or failed comes back with the reason.

Who can open the app?

A new app is private: you and anyone you list can open it, at your-slug.haechy.app. To let colleagues in, ask Claude to add them by email, or (on paid plans) to open the app to everyone at your company's email domain. They sign in with an emailed link and don't need a Haechy account. Sharing and sign-in has the details.

When the app needs an outside service

An app can't reach anything on the internet until you approve it. If the code mentions a payment provider, a calendar or an AI service, Claude asks Haechy for access to that host and gives you a link with the reason. Open it in the console and approve or deny. Approving outside services shows what that page looks like.