The FusionAuth MCP Server (fusionauth.io)

FusionAuth has released an MCP (Model Context Protocol) server that connects MCP-compatible AI assistants (Claude, Cursor, VSCode plugins, etc.) directly to a FusionAuth instance by auto-generating MCP tools from its OpenAPI spec. Released as an Apache‑2.0 open-source preview for local development, the server lets you describe tasks in natural language—e.g., “create a three-step registration form” or “find users who registered in the last 30 days and belong to ‘premium’”—and have the assistant orchestrate the underlying API calls, reducing context switching and accelerating prototyping. Under the hood it uses an open-source generator to convert FusionAuth’s OpenAPI into precise tool descriptions so the assistant has up-to-date endpoint, parameter, and return information. Installation is simple: set API_KEY_APIKEYAUTH and API_BASE_URL, add the server as a stdio MCP server, and point it at a dev instance. Security is handled by three layers: choose the instance, selectively expose API categories, and use a narrowly scoped API key (least-privilege recommended). Notes and limits: it’s explicitly for development (no OAuth2.1 flow), exposes 300+ APIs which can bloat context windows (server comfortably supports ~200k tokens and lets you exclude categories), and will auto-update with API changes. FusionAuth is soliciting developer feedback as they iterate.