MCP Servers

gmail-mcp

A read-only Gmail MCP server enabling users to search and read emails via Gmail search syntax without sending, deleting, or modifying anything.

README

gmail-mcp

A read-only Gmail MCP server, built from scratch on the MCP SDK — no third-party Gmail MCP packages. Lets Claude Code (or any MCP client) search and read a Gmail inbox without ever being able to send, delete, or modify anything.

Tools

Tool	What it does
`list_emails`	Search the inbox with full Gmail search syntax (`from:`, `newer_than:`, `has:attachment`, …), with a `maxResults` cap
`get_email`	Fetch a single message by id: headers plus the full plain-text body

Design notes

Read-only by construction. The OAuth scope is gmail.readonly — the token Google issues cannot send or delete mail even if the server were compromised.
Google OAuth 2.0 Desktop-app flow. A one-time npm run auth opens a browser for consent, then stores a refresh token locally. The server auto-refreshes access tokens and persists them back to disk, so auth survives restarts.
Secrets stay out of the repo. credentials.json (OAuth client) and token.json (tokens) are gitignored; the code loads them from disk at startup.

Setup

In Google Cloud Console, create a project, enable the Gmail API, and create an OAuth client of type Desktop app. Download it as credentials.json into this folder. While the consent screen is in Testing mode, add your address under Audience → Test users.

Install and authenticate:

npm install
npm run auth   # opens browser, writes token.json

Register with Claude Code (user scope makes it available in every session):
```
claude mcp add gmail -s user -- node /absolute/path/to/gmail-mcp/index.js
```
Verify with claude mcp list — the server should show as Connected.

Files

index.js — the MCP server (tool definitions, Gmail API calls, token refresh persistence)
auth.js — one-time OAuth consent flow; writes token.json

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