The best providers for MCP server authentication in 2026
Blog post from WorkOS
The Model Context Protocol (MCP) has emerged as the standard interface for AI agents to connect with tools and data, gaining rapid adoption by major tech companies like OpenAI, Google, and Microsoft. MCP requires specific OAuth 2.1 features like Dynamic Client Registration and Protected Resource Metadata, which traditional OAuth providers often lack. Consequently, a new wave of authentication providers has developed products tailored to MCP's unique needs, offering dynamic client registration, discovery endpoints, and seamless integration with MCP frameworks such as FastMCP and Cloudflare Workers. Among these, WorkOS stands out for its comprehensive support of the MCP specification and dual integration paths that allow teams to either adopt a full platform or overlay MCP-compliant OAuth flows on existing systems. Other notable providers include Auth0 by Okta, Stytch by Twilio, Cloudflare's open-source workers-oauth-provider, and Keycloak, each offering distinct advantages and trade-offs. WorkOS is particularly highlighted for its enterprise identity features, tool-level permissions, and independence from larger corporate agendas, making it a versatile choice for deploying MCP servers in production environments.