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On self-hosted OneCLI, Outlook Calendar needs your own Microsoft app first. See Self-hosted.

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Overview

OneCLI connects AI agents to Outlook Calendar through Microsoft’s OAuth flow. Agents can list events, create meetings, check availability, and manage RSVPs. The gateway injects OAuth credentials into requests to the Microsoft Graph API automatically. This is useful for scheduling agents in Microsoft 365 environments that need to coordinate meetings, check availability, or manage calendars.

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What you will set up

  • An Outlook Calendar connection through Microsoft OAuth
  • Automatic token injection on Microsoft Graph requests
  • Per-agent, per-tool access, such as approval before creating events

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Setup

1

Go to Connections

Open the OneCLI dashboard and navigate to Connections > Outlook Calendar.
2

Authorize

Click Connect Outlook Calendar. You’ll be redirected to Microsoft to sign in and authorize OneCLI. Review the permissions and click Accept.
OneCLI connect window for Outlook Calendar on Cloud, showing the Connect to Outlook Calendar button.

The Outlook Calendar connect window on OneCLI Cloud.

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Self-hosted: use your own Microsoft app

Skip this section on OneCLI Cloud. It’s only for self-hosted OneCLI without MICROSOFT_CLIENT_ID and MICROSOFT_CLIENT_SECRET set. One Microsoft app serves all four Microsoft apps in OneCLI, so you set it up once.

Set up your Microsoft app

Follow Self-hosted: use your own Microsoft app on the Outlook Mail page. If you already have one for another Microsoft app, it already works here. Then open Connections > Outlook Calendar and select Connect Outlook Calendar.
OneCLI Custom credentials card for Outlook Calendar with the setup guide link, the Redirect URI and its copy button, and the Client ID and Client Secret fields.

Custom credentials for Outlook Calendar in OneCLI. The Microsoft app is shared, so the same client works here.

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What agents can do

  • List events on your calendar within a date range
  • Get details for a specific event (attendees, location, Teams link, body)
  • Create new events with attendees, location, and online meeting settings
  • Update existing events (reschedule, modify attendees, change details)
  • Delete or cancel events
  • Check free/busy availability for one or more users
  • Respond to event invitations (accept, decline, tentative)
  • List all calendars on the account
  • Create and manage calendar groups
  • Find meeting times that work for all attendees

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Controlling access

Access is per agent: grant the connection to each agent that needs it, choosing per tool what runs freely, what needs human approval, and what stays blocked — a read-only agent is a single grant. Organization rules add guardrails on top, like rate limits and blanket blocks. Everything is checked before credential injection, so a blocked request never reaches Microsoft Graph.

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FAQ

Yes. Allow read tools and block or require approval for writes when you grant the connection.
No. The token stays in OneCLI, and the gateway adds it at the proxy. See How it works.
Open Connections > Outlook Calendar and connect again. Agents with access use the new connection automatically.