Integrations · Claude Duet

Every calendar you have, for Claude Duet

Claude Duet is Anthropic's proactive agent: it checks your connected apps and tells you what needs attention. It uses the connectors on your Claude account, and Microsoft 365 isn't among them yet. Add Synced once and Duet sees every Google and Outlook account you've connected to Synced, merged into one calendar, plus your tasks.

Connect Claude Duet Why one connector

  • Outlook and Microsoft 365

    Synced reads Outlook through Microsoft's calendar API and hands it to Duet with your Google calendars.

  • Every account at once

    Work, client and personal calendars in one connector. An invite on two accounts comes back once, with your reply on each.

  • Invitations it can answer

    Duet can accept, decline or tentatively accept invites on the right account.

  • Asks before acting

    Every tool tells Duet whether it reads, writes, deletes or reaches other people, so it checks with you before invites go out.

Claude Duet · Synced connector

Each morning, tell me what needs attention on my calendars.

list_events{"start_date":"2026-11-10","end_date":"2026-11-10"}

09:00 Northwind standup (maria@northwind.io · Google) 10:00 Pricing sync (northwind.io + globex.com · one event, not answered on globex.com) 13:00 Busy (gmail.com) 15:00 Globex steering committee (maria.ortiz@globex.com · Outlook)

Four things today across Google and Outlook. You haven't answered the pricing sync on your Globex account. Accept it?

Yes

respond_to_event{"event_id":"…","start":"2026-11-10T10:00","response":"accepted","calendar_account":"maria.ortiz@globex.com"}

accepted on maria.ortiz@globex.com

Accepted on your Globex calendar.

A proactive agent reading Google and Outlook through Synced · sample data

Connect Claude Duet

  1. 1. Create a Synced API key

    In Synced, open Settings → Integrations and choose Generate New API Key. Copy the MCP Server URL shown under it; it already contains the key, so treat it like a password.

  2. 2. Add Synced to your Claude account

    In Claude, open Customize → Connectors, choose Add custom connector, name it Synced and paste the URL.

  3. 3. Let Duet use it

    Duet works from the connectors on your Claude account, so Synced is available to it once it's added. Ask Duet about your calendar to check.

Server URL format:

https://api.meetsynced.com/functions/v1/mcp?api_key=sk_live_your_key

Tested with Claude Duet in November 2026. Duet is a research preview (US, Pro and Max, with a waitlist); the same connector also works in regular Claude chats.

Then ask

  • “What needs my attention on my calendars this week?”
  • “Have I answered every invite on my Outlook account?”
  • “Block 2 hours before Thursday for the board deck.”

Questions

Does Claude Duet work with Outlook?
Not directly yet: Microsoft 365 isn't one of Duet's connectors. Through the Synced connector it reads Outlook and Microsoft 365 calendars along with Google, because Synced connects to Microsoft for you.
How does Claude Duet get my calendars from Synced?
Duet uses the connectors on your Claude account. Add Synced as a custom connector in Claude and Duet can use it like any other connected app.
Can Duet book meetings for me?
Yes, through Synced's book_meeting tool. If the time clashes with any of your calendars, it's refused until Duet confirms with you.
Can Duet see other people's meetings?
Only as busy time. Synced never hands an assistant the titles of other people's events.

Also works with

Connect your calendars once

Then every assistant you use gets all of them.

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