Outlook Local MCP

Local-first Microsoft Outlook MCP server (calendar + mail via Microsoft Graph). Single Go binary, stdio transport, OS-keychain token storage, multi-account. 4 aggregate domain tools (calendar, mail, account, system) with progressive disclosure via a help verb to keep cold-start schema small.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "desek-outlook-local-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "desek-outlook-local-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

Outlook Local MCP Server

A single-binary MCP server that connects Claude Desktop and Claude Code to Microsoft Outlook via the Microsoft Graph API. Manage your calendar, read email, and compose drafts without leaving your AI assistant.

outlook-local-mcp demo

Install

Go binary (recommended):

bash

go install github.com/desek/outlook-local-mcp/cmd/outlook-local-mcp@latest

Docker / OCI:

Terminal

docker run -i --rm \
  -v outlook-mcp-auth:/data/auth \
  -e OUTLOOK_MCP_TENANT_ID=<tenant> \
  -e OUTLOOK_MCP_CLIENT_ID=<client> \
  ghcr.io/desek/outlook-local-mcp:latest

See Container deployment for the full client config snippet, and Container runtime for the keychain trade-off and image variants.

Claude Desktop extension (no terminal required):

Download the .mcpb file from the latest release and open it in Claude Desktop via Settings > Extensions > Install from file.

Tool invocation shape

All operations use four aggregate domain tools dispatched by an operation verb:

JSON Config

{tool: "calendar", args: {operation: "list_events", date: "today"}}
{tool: "mail",     args: {operation: "list_folders"}}
{tool: "account",  args: {operation: "list"}}
{tool: "system",   args: {operation: "status"}}

Call any domain with operation: "help" to list its verbs and parameters.

Documentation

Guide	Contents
docs/readme.md	Project overview and feature list
docs/quickstart.md	Prerequisites, installation, and first tool call
docs/concepts.md	Output tiers, multi-account model, mail gating, OAuth scopes, observability, and more
docs/troubleshooting.md	Auth errors, Keychain issues, Graph throttling, and account lifecycle

For LLM clients: see llms.txt for a machine-readable index.

Acknowledgements

Support and testing by GigWhere ❤️

License

MIT License. See LICENSE for details.

Read the full README →View source on GitHub →

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Frequently Asked Questions about Outlook Local MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "outlook-local-mcp": { "command": "npx", "args": ["-y", "desek/outlook-local-mcp"] } }

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Technical Specs & Signals

CategoryCommunication

37Quality signal: Fair · 37/100How this signal is calculated ▾

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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

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Adoption & activity1/15

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