Build a Multi-Account Gmail MCP Server for Claude Desktop

I need a local MCP (Model Context Protocol) server that connects 5 Gmail accounts (1 personal, 4 business) to Claude Desktop, so I can search, read, draft, and send email across all of them without manually switching accounts. This is an MCP (Model Context Protocol) server for Claude Desktop — not a chatbot or model-training project. Requirements: - Local MCP server (runs on my machine, no hosting/cloud needed) - OAuth 2.0 setup under one Google Cloud project, authenticating all 5 Gmail accounts - Secure local token storage with automatic refresh - MCP tools for: searching mail, reading a message/thread, sending, drafting, and applying labels - Every tool call should let Claude specify WHICH account to act on (e.g. "personal", "work-main", "work-sales", etc.) - A summary/check tool designed for periodic automated use (e.g. "check all 5 inboxes and return anything unread/urgent") — this will be called on a schedule by Claude directly, so it should be fast and return a concise summary rather than full message dumps - One-time browser-based login per account during setup; hands-off after that - Compatible with Claude Desktop's MCP configuration Deliverables: - Working, tested MCP server (Python preferred) - Setup documentation - A short screen-share call to walk through authenticating my 5 accounts together Milestones: 1. OAuth working end-to-end on 1-2 accounts (proof of concept) 2. All 5 accounts authenticated + full toolset, including the summary/check tool