OAuth 2.1

In short: OAuth 2.1 is a consolidation of OAuth 2.0 and its security best practices into one specification. It requires PKCE for authorization code flows and removes weaker grants. MCP authorization builds on it, and many agent identity products name it as a supported standard.

Where does it show up in practice?

Aembit, Descope and Idira material all name OAuth 2.1.

Related terms

• pkce
• mcp authorization