How to Connect ChatGPT to Your Mac

What This Lets You Do

ChatGPT runs in the cloud, but your email, calendar, and Teams chats live on your Mac. With LMCP plus the Cloud Relay, ChatGPT can call tools that run directly on your Mac. Ask it from any device:

• “Summarize my unread emails from this week”
• “What’s on my calendar tomorrow?”
• “Find the Teams message where Marco mentioned the API migration”
• “Draft a reply to Sarah’s email about the budget”

ChatGPT sends the request to the LMCP backend, the backend forwards it through an encrypted WebSocket tunnel to your Mac, your Mac runs the tool, and the result comes back to ChatGPT — usually in under 2 seconds.

What You Will Need

• macOS 12 (Monterey) or later — Apple Silicon or Intel
• ChatGPT Plus, Pro, Business, Enterprise, or Edu — custom MCP connectors (Developer mode) are not available on the free plan
• A browser on chatgpt.com — creating the connector is web-only (the desktop/mobile apps can use it afterward)

How to Connect ChatGPT to Your Mac

Create the connector from the web at chatgpt.com — the desktop and mobile apps can use a connector once it exists, but can’t create one. On Business/Enterprise/Edu a workspace admin may need to enable Developer mode first (Workspace Settings → Connectors).

The token identifies your specific Mac — it’s the secure, unambiguous way to grant access (no email, so it can’t collide with another machine). You only approve once; with forwarding ON, ChatGPT then discovers the full catalog (230+ tools).

Try It

Start a new conversation in ChatGPT. Make sure the LMCP connector is enabled in the chat (the connector toggle in the input bar). Then ask:

• “List my email accounts”
• “What meetings do I have today?”
• “Search my emails for ‘invoice’ this month”
• “Show me the latest messages in the engineering Teams channel”

ChatGPT will route the request through the Cloud Relay to your Mac, which executes the tool and returns the result. You’ll see a tool call indicator in ChatGPT’s UI, and the response usually arrives in under 2 seconds.

Privacy Story

Cloud Data Forwarding is off by default and opt-in per machine. When off, the connector's tools/list advertises only setup_install — data tools are not listed until you enable forwarding.

When you turn it on, your data still comes from your Mac — nothing is stored in the cloud. The bytes transit through the encrypted tunnel between your Mac and the LMCP backend, but they’re never persisted server-side. Turn it off any time and ChatGPT instantly loses access.

If you prefer zero cloud transit, you can use the local lmcp connector inside Claude Desktop, Cursor, or VS Code instead — tool calls go through stdio and never touch the network. Read the privacy guide for the full breakdown.

What Tools Are Available?

With Cloud Data Forwarding on, ChatGPT sees the same 230+ tools as the local lmcp connector:

• Mail (Mail.app + Outlook): list, read, search, send, reply, move, save attachments
• Calendar: list events, create, delete, check availability
• Contacts: search, list, get details
• Microsoft Teams: list chats, read messages, channel messages (no Graph API needed)
• OneDrive: list, read, write, move, delete, search files
• Notes & Reminders: list, search, create, complete
• Messages: read iMessage chats
• OmniFocus: list tasks, projects, complete, search
• Word, Excel, PowerPoint, PDF: read and create
• Finder & Safari: search files (Spotlight), list folders, bookmarks

Use Cases

Inbox triage from your phone

You’re away from your Mac but want to triage your inbox. Open ChatGPT on your phone: “Summarize new emails from the last 24 hours, group by sender, flag anything from legal or finance.” ChatGPT calls your Mac, reads Mail.app, returns a categorized summary in seconds.

Meeting prep before walking into the room

You have a 3pm meeting and 5 minutes to prepare. From ChatGPT: “Prep me for the 3pm with Maria and Juan. Find recent emails, Teams chats, and shared docs from the last week.” ChatGPT cross-references your calendar attendees with email/Teams/OneDrive activity and gives you a context brief.

Weekly status report

Friday afternoon: “Write my weekly status report based on this week’s emails, calendar events, and Teams discussions.” ChatGPT pulls the data, generates the report, you copy-paste to Slack or send by email.

Turning It Off

Open the LMCP menu bar popover → Web AIs section, toggle Cloud Data Forwarding back to OFF. The change is instant: ChatGPT immediately loses access to data tools. Your tunnel stays connected for setup_install, but no data flows through.

Troubleshooting

ChatGPT says “Could not reach your Mac”

The LMCP app isn’t running, or the Cloud Relay tunnel is down. Open the LMCP menu bar — the dot should be green and Cloud Relay should read Connected. If LMCP isn’t running at all, download and reinstall LMCP.

Settings shows “No app actions available yet” after connecting

This is expected — it does not mean the connector is broken. ChatGPT’s developer-mode app settings panel does not enumerate MCP tools there. Once it says Connected (and the button reads Disconnect), the tools work in chat: start a new chat, click + → More → Local-mcp to enable it, then ask e.g. “using Local-mcp, list my calendars.” The tool call runs and returns data from your Mac.

LMCP’s tools don’t appear right after connecting

A known ChatGPT Developer-Mode quirk: it caches the connector’s tool list and doesn’t always reload it the moment OAuth completes. Open Settings → Connectors → LMCP → Információn and click Actualizar (Refresh) — or just start a new chat. The full tool set then loads. (LMCP advertises 230+ tools; ChatGPT also surfaces only the few relevant to your current question and loads the rest on demand, so don’t worry if “list all tools” shows just a handful.)

Tools list shows only setup_install (no Mail, Calendar, etc.)

Cloud Data Forwarding is OFF — the cloud connector intentionally lists only setup_install until you opt in. Open the LMCP menu bar popover → Web AIs section, toggle Cloud Data Forwarding ON, then refresh ChatGPT.

ChatGPT says “the connector is not authenticated”

The token is wrong or expired. Open the LMCP menu bar popover → Web AIs section, click Copy next to Connector token, and paste it again on ChatGPT’s Authorize page.

Cloud Relay isn’t connected

The Cloud Relay connects automatically when LMCP runs (green dot, reads Connected). For data tools you also need Cloud Data Forwarding ON. Check both in the Web AIs section.

There’s no way to add a connector in ChatGPT’s Apps

Developer mode isn’t on. Go to Settings → Apps and turn on Developer mode — it now has its own page under Security & sign-in (linked from the bottom of Apps). On a Business/Enterprise/Edu workspace, an admin may need to allow custom connectors first. Also make sure you’re on chatgpt.com in a browser — the desktop and mobile apps can’t create connectors.

The token isn’t being accepted

Make sure you copied the whole token (it starts with lmcp-) using the Copy button in Settings → Connect — don’t retype it. The Token field only appears when the Cloud Relay is connected (green dot) andCloud Data Forwarding is ON. If ChatGPT later says the connector is “not authenticated”, copy the token again and re-paste it in the connector settings.

What About Other AI Clients?

The Cloud Relay works with any MCP-compatible client that supports custom servers and Bearer authentication:

• Claude.ai web: same flow, add as Custom Connector in Settings — see the Claude.ai guide
• Custom MCP clients: any tool that can hit a JSON-RPC endpoint over HTTPS with Bearer auth

For Claude Desktop, Cursor, VS Code, Windsurf, or Zed running on your Mac, you don’t need the Cloud Relay at all — LMCP autoconfigures the local lmcp connector during install, and tool calls go through stdio without touching the cloud. See the Claude Desktop guide for that flow.

Frequently Asked Questions

Can ChatGPT access my Mac's email and calendar?

Yes. With LMCP's custom connector on chatgpt.com, ChatGPT can read your email, manage your calendar and search Teams. Requests route to your Mac over an encrypted tunnel and run locally — your data isn't stored in the cloud.

Do I need API keys to connect ChatGPT to my Mac?

No API keys. LMCP itself is free. Adding a custom connector on ChatGPT's side requires a paid ChatGPT plan (Plus, Pro, Business, Enterprise or Edu) with Developer mode enabled — that's a ChatGPT requirement, not an LMCP one.

Which Mac apps can ChatGPT use through LMCP?

Mail, Calendar, Microsoft Teams, Slack, WhatsApp, Notes, Reminders, Files and more —233 tools across 25+ domains, all on your Mac.

Related Guides

• Connect ChatGPT to Your Email on Mac
• Connect ChatGPT to Your Calendar on Mac
• How to Connect Claude.ai Web to Your Mac (Cloud Relay)
• How to Give Your AI Access to Email on Mac
• Read Microsoft Teams Messages with AI — No Tokens, No Graph API
• Can AI Read Your Emails Without Sending Them to the Cloud?