How to integrate Office 365 (Email/Calendar) with gemini-cli via MCP?

Integrating Office 365 Email and Calendar with Gemini CLI through Microsoft Graph API: A Step-by-Step Guide

In today’s fast-paced digital environment, seamless integration between communication tools and command-line interfaces (CLI) can significantly enhance productivity. If you’re looking to interact with your Office 365 email and calendar via gemini-cli—a versatile command-line tool—you’ve come to the right place. This guide outlines the process of connecting Office 365’s rich suite of email and calendar functionalities to gemini-cli using Microsoft Graph API.

Understanding the Challenge

Many professionals seek to manage their email and schedule using natural language commands within their CLI tools. Achieving this integration involves leveraging Microsoft Graph API, which provides programmatic access to Office 365 services, and configuring gemini-cli to authenticate and communicate with this API.

Prerequisites

• An Office 365 (Microsoft 365) account with email and calendar access.
• Administrative access to register an application in Azure AD.
• gemini-cli installed on your system.
• Basic familiarity with OAuth 2.0 authentication flows.
• Knowledge of command-line operations and scripting.

Step 1: Register an Application in Azure AD

To enable secure communication with Office 365 services, you must first register an application in Azure Active Directory:

1. Log in to the Azure Portal.
2. Navigate to “Azure Active Directory” > “App registrations.”
3. Click “New registration.”
4. Provide a name for your app and specify the redirect URI (e.g., http://localhost for testing).
5. After registration, note down the Application (client) ID and Directory (tenant) ID.
6. Under “Certificates & secrets,” create a new client secret; store this securely.
7. Configure API permissions:
8. Add Microsoft Graph permissions such as Mail.ReadWrite, Calendars.ReadWrite, and any others necessary.
9. Grant admin consent if necessary.

Step 2: Obtain OAuth 2.0 Access Tokens

Using the registered app credentials, you’ll need to authenticate with Microsoft Graph:

• Implement an OAuth 2.0 authorization flow to acquire access tokens.
• Tools like Postman or command-line utilities such as curl can facilitate this process.
• Ensure that tokens are refreshed appropriately to maintain access.

Step 3: Connect gemini-cli to Microsoft Graph API

Depending on gemini-cli’s capabilities, you may