Microsoft Skill

A Claude Code plugin for Microsoft Graph API integration, focused on Outlook/Hotmail email access.

Installation

Add this plugin to Claude Code:

claude mcp add-plugin /path/to/microsoft-skill

Or add to your Claude Code configuration.

Features

• OAuth 2.0 Authentication with PKCE
• Email Operations: List messages, download as .eml
• Secure Storage: 1Password or local file credentials
• Per-project Tokens: Different Microsoft accounts per project

Quick Start

Once installed, the skill triggers when you ask about emails:

• "Check my outlook inbox"
• "Read my emails"
• "Download recent messages from hotmail"
• "List my microsoft mail"

First-time Setup

1. Configure credentials:

   pnpm tsx skills/microsoft-outlook/scripts/microsoft.ts setup

2. Authenticate:

   pnpm tsx skills/microsoft-outlook/scripts/microsoft.ts auth

3. Verify:

   pnpm tsx skills/microsoft-outlook/scripts/microsoft.ts me

Plugin Structure

microsoft-skill/
├── .claude-plugin/
│   └── plugin.json          # Plugin manifest
├── skills/
│   └── microsoft-outlook/
│       ├── SKILL.md         # Skill instructions
│       ├── scripts/         # CLI implementation
│       │   ├── microsoft.ts
│       │   └── lib/
│       └── references/      # Detailed documentation
│           ├── setup-guide.md
│           └── api-reference.md
├── package.json
└── README.md

Commands

Command	Description
setup	Configure API credentials
auth	Run OAuth flow
check	Verify auth status
me	Get user profile
messages	List recent messages
download <id>	Download message as .eml
download-all	Download recent messages

Credential Setup

Register an app in Microsoft Entra admin center or the Azure Portal:

1. Sign in: Use your Microsoft account. If you see an error about not being in a directory, follow the prompt to "Sign up for Azure" (free) to create a default directory.
2. App registrations > New registration
3. Name: microsoft-skill-cli
4. Supported account types: Select "Accounts in any organizational directory (Any Microsoft Entra ID tenant - Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)".
   • Note: This is required if you want to use a personal @outlook.com or @hotmail.com account.
5. Redirect URI: Select Web and enter http://localhost:3000/callback.
6. Register: Click the button.
7. Client ID: Copy the Application (client) ID from the Overview page.
8. Client Secret:
   • Go to Certificates & secrets > New client secret.
   • Add a description and click Add.
   • Copy the Value (not the Secret ID) immediately.
9. API permissions:
   • Go to API permissions > Add a permission.
   • Select Microsoft Graph > Delegated permissions.
   • Add Mail.Read and User.Read.
   • (Optional) Click Grant admin consent if you are the tenant admin.

Storage Options

1Password (recommended): The script looks for Secure Notes in your Personal vault:

• op://Personal/Microsoft Client ID/notesPlain
• op://Personal/Microsoft Client Secret/notesPlain

Local file: ~/.config/microsoft-skill/credentials.json Run pnpm tsx scripts/microsoft.ts setup and choose "Enter manually".

Token Storage

• Per-project: .claude/microsoft-skill.local.json
• Global: ~/.config/microsoft-skill/tokens.json

Add .claude/*.local.* to .gitignore.

License

MIT