Use HEY with ChatGPT, Claude, and your other AI assistants █

• What’s new in my HEY Imbox today, and does anything need a reply from me?
• Find the email from Northwind about the invoice and draft a reply saying we’ll pay by Friday.
• Summarize the thread with Priya about the launch date and list the open questions.
• Move the newsletters in my Imbox to The Feed.
• Who’s waiting in my Screener? Screen out the no-reply addresses.
• What’s on my HEY Calendar this week? Add a to-do for Friday: send the launch plan.
• Bubble up the thread with my accountant next Monday.

Most of what you do in HEY, short of sending.

• The Imbox, The Feed, and Paper Trail: catch up on what’s new, and what’s waiting for a reply.
• Search and threads: find any email by sender, subject, or what it says, and get the gist of a long thread.
• Drafts: write a new email or a reply, revise a draft, or throw one away. Every draft waits in HEY for you.
• Organizing: move threads between the Imbox, The Feed, Paper Trail, Reply Later, and Set Aside, mark them seen or unseen, add and remove labels, and Bubble Up a thread for later.
• The Screener: see who’s waiting, and screen out the senders you don’t want.
• HEY Calendar and to-dos: check your day or your week, and add, change, and check off to-dos. To-dos need Your personal calendar switched on when you authorize access.
• Contacts: look up who’s who.

It can’t delete or trash your email, and it can’t change your calendar events.

You send, not your assistant

In ChatGPT and Claude, your assistant saves the email as a draft and gives you its link. Open it in HEY, look it over, and press Send yourself.

Some MCP apps can stop and ask you a question. If yours can, and you turned on Send when you connected, your assistant can offer to send a draft for you. HEY asks you first, every time: it shows you who it’s going to, the subject, and what it says, and nothing goes out unless you say yes. If the draft changes after you say yes, it isn’t sent. Letting a sender through The Screener works the same way: you confirm each one, or you screen them in from HEY.

• Your access, nothing more. Your assistant can only see what you can see in HEY, in the accounts you picked, and only when you ask it something.
• Look, don’t touch, if you prefer. Turn off Write when you authorize access, and your assistant can read but can’t change a thing. Send stays off unless you turn it on.
• Strangers can’t give it orders. From senders you haven’t screened in, your assistant sees who’s waiting, but never what they wrote. And everything a sender wrote is marked as theirs, so your assistant can tell their words from yours.
• Nothing goes out on its own. Your assistant can draft, but you send.
• Revoke access anytime. In HEY, go to Login & Security → Connected Apps and click Revoke access. The app is cut off right away, in every account it reached. Revoking access doesn’t delete anything it already received, and what it did while connected stays put.
• No training, no selling. 37signals doesn’t use your connected-app activity to train AI models, and doesn’t sell it.

Your HEY data is covered by our privacy policy, HEY’s subprocessors, terms of service, and security overview. Once your assistant has received something, what it does with it is up to that assistant’s own terms and privacy policy.

This is our hosted MCP server, at https://mcp.hey.com/mcp. Any app that speaks MCP and signs in with OAuth from your own device can use it, the way Claude Code and Cursor do: point it at the address and sign in to HEY. An app that signs in from its own website, as the assistants above do, needs its callback host on our list first. Building one? Tell us at support@hey.com.

Claude Code

claude mcp add --scope user --transport http hey https://mcp.hey.com/mcp

Then run /mcp in Claude Code, pick HEY, and sign in.

Cursor

Add HEY to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "hey": { "url": "https://mcp.hey.com/mcp" }
  }
}

Every tool, by what it can do

The server offers 45 tools. Each one does one thing, and its own description says whether it only reads or changes something. Your app shows you the list, inputs included, once you’ve connected.

• Read (22). Every get_… and list_… tool, and search_mail. They change nothing in HEY.
• Write (20). Drafts (create_draft, reply_draft, update_draft, delete_draft), moving threads between boxes (move_to_…), mark_seen and mark_unseen, labels (add_label, remove_label), Bubble Up (schedule_bubble_up, cancel_bubble_up), screen_out_sender, and to-dos (create_todo, update_todo, complete_todo, uncomplete_todo). They change your own mail, drafts, or to-dos, and reach no one.
• Sensitive (3). send_draft delivers email to other people. screen_in_sender lets a stranger’s mail into your Imbox, and what they wrote into your assistant’s reach. delete_todo is permanent. HEY asks you to confirm the first two every time, so they’re offered only to apps that can stop and ask you, which is why ChatGPT and Claude see 43 tools, not 45.

Working from a terminal? Check out the HEY CLI and TUI.