OAuth 2.1 is a consolidation of OAuth 2.0 best practices developed over a decade into a single, simplified specification, dropping legacy flows that proved insecure and making protections such as PKCE mandatory. Agentic identity implementations generally build on OAuth 2.1's stricter baseline rather than the original, more permissive OAuth 2.0 specification.
Frequently asked questions
Do I need to migrate from OAuth 2.0 to OAuth 2.1?
OAuth 2.1 is a consolidation rather than a fully separate protocol, so migration mainly means dropping legacy flows and making protections like PKCE mandatory rather than optional.
Why does OAuth 2.1 matter specifically for agentic identity?
Agentic flows involve automated, non-browser clients more often than typical web apps, and OAuth 2.1's stricter baseline closes gaps that mattered less when every client was a browser a human was watching.
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