OPENAI · MCP CLIENTQUICKSTART · 2 MIN

ChatGPT × Hail

ChatGPT speaks MCP through Connectors. Add Hail once and every chat — including custom GPTs — gets the call/sms/mail toolset.

ChatGPT DesktopGPTs (Custom)Connectors

Two steps. That's the bar.

~60 SECONDS · NO API KEY
01

Drop Hail into your config

Add the Hail MCP server using the snippet below. Paste it where this client expects MCP servers — the path varies, the shape doesn't.

Settings → Connectors → Advanced → Developer mode → Create

URL · Connector URL

https://mcp.hail.so
02

Click Allow. Then try it.

Reload the client. On first use it pops a browser tab — sign in to Hail (or sign up — takes 30 seconds), click Allow, and tokens flow back to the client. Send the prompt below — if a call is placed, an SMS lands, or an email shows up in the inbox view, you're done.

"Send an SMS to +1-415-555-0123 saying tomorrow's meeting moved to 3pm."
■ NOTES & GOTCHAS
  • Custom MCP connectors require Developer Mode: Settings → Connectors → Advanced → toggle Developer mode on, then a Create button appears in the Connectors list.
  • Paste https://mcp.hail.so as the server URL and click Create — ChatGPT walks you through the OAuth consent on first call; no token to copy.
  • Available on Plus, Pro, Team, Enterprise, and Edu. Free ChatGPT doesn't support custom connectors.
  • In Custom GPTs, toggle the Hail connector under Capabilities once it's been added.
  • Conversation history is never sent to Hail — only the tool args your agent picks.
  • Manage or revoke this app at https://hail.so/console/apps after first connect.
  • Self-host? Set HAIL_API_KEY as the bearer; see docs/setup/mcp.

Hail your first call — from this client.

Self-host on your own carrier or claim a managed number. Either way, your agent picks up the phone in ~120 seconds.

Get Access →Client docs ↗
■ ALSO AVAILABLE FOR
ClaudeChatGPTGeminiCursorWindsurfGitHub CopilotZedRaycast+all clients