outlook-local-mcp
Local-first Microsoft Outlook MCP server: a single Go binary that manages calendar events and mail through the Microsoft Graph API over stdio, with tokens stored in the OS keychain and no Entra ID app registration required. Exposes four aggregate tools (calendar, mail, account, system) dispatched by an operation verb, with multi-account support and read-only and mail-gating modes.
README
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.
<p align="center"> <img src="docs/assets/demo.gif" alt="outlook-local-mcp demo"> </p>
Install
Go binary (recommended):
go install github.com/desek/outlook-local-mcp/cmd/outlook-local-mcp@latest
Docker / OCI:
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:
{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.
License
MIT License. See LICENSE for details.
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