Matrix MCP Server is a TypeScript-based MCP server that provides secure, standardized access to Matrix homeserver functionality via the MCP interface. It enables MCP clients to interact with Matrix rooms, messages, users, and related data while isolating each operation with ephemeral Matrix clients. The server supports two authentication modes: OAuth 2.0 with token exchange for production deployments, and a development mode that uses direct Matrix access tokens. It includes multi-homeserver support with configurable endpoints and a suite of tools organized by tiers: Tier 0 read-only tools (room, message, user, search, and notification inquiries) and Tier 1 action tools (messaging, room lifecycle, and room administration). The architecture is three-layer: an HTTP layer (Express-based) with OAuth integration, an MCP layer that registers tools and routes requests, and a Matrix layer that handles homeserver communication. Each tool creates ephemeral Matrix clients, performs the requested operation, and cleans up automatically. The README also covers environment configuration (.env), client integration examples (Claude and VS Code), and development workflows.