How do I authenticate MS365 with Claude Code?

You can use the interactive Device Code Flow by running the login tool, or configure an Azure AD App Registration with Client IDs and Secrets for automated production use.

How does this skill optimize token usage?

The skill features a --toon format that reduces response size by 30-60% and allows for specific 'presets' to load only the tool categories you need, such as mail or calendar.

Is there a way to limit the skill to read-only access?

Yes, you can launch the server with the --read-only flag to disable all tools that perform write operations like send, delete, create, or update.

Can I use this skill for organization-wide tasks?

Yes, by enabling the --org-mode flag, you gain access to Microsoft Teams, SharePoint sites, shared mailboxes, and the organization user directory.

MS365 for Claude Code

Name: MS365 for Claude Code
Author: bennoloeffler

bybennoloeffler

Productivity & Workflow

Automates Microsoft 365 tasks including email management, calendar scheduling, file operations, and Teams collaboration directly within Claude Code.

About

This skill integrates the full Microsoft 365 suite with Claude Code via the Model Context Protocol (MCP), enabling seamless interaction with Outlook, OneDrive, SharePoint, and Teams. It allows developers and power users to manage their professional workflow—sending emails, organizing meetings, manipulating Excel data, and interacting with organization-wide resources—without leaving their terminal. With support for advanced OData filtering, multiple authentication flows, and token-optimized responses (TOON), it provides a robust and efficient interface for automating complex office productivity tasks through AI.

Key Features

Comprehensive file operations for OneDrive and SharePoint document libraries
Full Outlook integration for managing emails, calendars, and contacts
Teams and SharePoint organization-mode for professional collaboration
Token-optimized 'TOON' format to reduce LLM overhead and costs
Granular tool presets and read-only modes for enhanced security
0 GitHub stars

Use Cases

Querying and updating Excel spreadsheets or OneNote notebooks via natural language
Programmatically uploading build artifacts, reports, or documentation to OneDrive
Automating recurring meeting scheduling and personalized email follow-ups

About

Key Features

Comprehensive file operations for OneDrive and SharePoint document libraries
Full Outlook integration for managing emails, calendars, and contacts
Teams and SharePoint organization-mode for professional collaboration
Token-optimized 'TOON' format to reduce LLM overhead and costs
Granular tool presets and read-only modes for enhanced security
0 GitHub stars

Use Cases

Querying and updating Excel spreadsheets or OneNote notebooks via natural language
Programmatically uploading build artifacts, reports, or documentation to OneDrive
Automating recurring meeting scheduling and personalized email follow-ups