Stytch is an identity platform for human users and AI agents, and has joined Twilio. One integration covers authentication, authorization and security, so an app can let agents and MCP clients such as Cursor, Claude and Devin connect and act on a user's behalf.

Key features:

Let users connect AI agents and other apps to your product with Connected Apps and OAuth.
Secure MCP servers so agents get scoped access.
Authenticate services without a human using machine-to-machine tokens.
Offer passkeys, breach-resistant passwords, SAML SSO and device-aware MFA.
Run multi-tenant B2B auth with SCIM, RBAC, JIT provisioning and an embeddable admin portal.
Block bots and fraud with device intelligence and rate limiting.

Stytch offers pre-built UI components, headless SDKs and backend APIs. The pay-as-you-go plan is free for 10,000 monthly active users and AI agents, 1,000 M2M tokens and 5 SSO or SCIM connections, with usage pricing above that; Enterprise adds HIPAA/BAA and SLAs.