Validate AI agent identity credentials and delegated-authority chains against KYA-OS (Know Your Agent OS), donated to the Decentralized Identity Foundation (DIF) Trusted AI Agents Working Group in March 2026. Checks credential chain integrity, scope limits, delegation depth, validity windows, and EU AI Act 2 December 2027 compliance posture (Digital Omnibus). The KYA-OS delegation model follows KERI delegated identifiers and the witness model (ratified by the Trust over IP Foundation, January 2026) and vLEI organizational identity (ISO 17442-3), with Urbit ID as earlier prior art; did:webvh is the named upgrade path for portable identifiers. Client-side. Zero PII.