Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Question regarding Oathkeeper mutators, is it possible to populate the custom claims in the id_token from subject values stored in Ory Keto? While we are using Keto as an authorizer, our backend services expect some of this permission data in the token for certain business logic.

Seems like `hydrators` might be what I'm looking for, but I'd appreciate any other recommendations.

Yep. `Hydrators` suits best for your case