feat(#4521): AGNTCY Identity badge verify — agents-kt-identity module#219
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The trust pillar of the AGNTCY epic (#4517), beside the OASF discovery record (#4518) and A2A invocation. Verify-only; issuance is deferred to the self-hosted stack. - IdentityVerifier.verify(compactJws, jwks): validates a JOSE/JWS-secured W3C VC badge against an issuer JWKS, returns VerifiedBadge or throws BadgeVerificationException. Fail-closed and NOT hand-rolled — delegates to nimbus-jose-jwt's DefaultJWTProcessor. Negative tests cover every forgery class: alg=none, HS* algorithm-confusion, tamper, expiry, wrong key, unknown kid. - IdentityResolver.fetchJwks(url) / fetchText(url): bounded (timeouts + size cap) reads of /.well-known/jwks.json and vcs.json. vcs.json returned raw (AGNTCY VC envelope still settling upstream); the cryptographic verify is the stable core. - New feature module agents-kt-identity (package agents_engine.agntcy.identity) so the nimbus dependency stays out of core — the agents-kt-rag pattern. Lockfile + sha256 verification-metadata for nimbus-jose-jwt 10.3 (no transitives). - 8 tests. README + CHANGELOG + PRD §12.6 + internals adjunct updated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
AGNTCY Identity badge verify — the trust pillar of epic #4517, beside the OASF discovery record (#4518) and A2A invocation (§12.5). In a trust-gated agent network you accept work only from agents whose badge a known issuer signed. Verify-only; issuance (keys/signing/vaults) is deferred to the self-hosted stack (PRD §12.6).
What landed
IdentityVerifier.verify(compactJws, jwks)— validates a JOSE/JWS-secured W3C VC badge against an issuer JWKS (/.well-known/jwks.json), returningVerifiedBadge(issuer / subject /credentialSubject) or throwingBadgeVerificationException.nimbus-jose-jwtDefaultJWTProcessor. Negative tests cover every forgery class:alg: none,HS*algorithm-confusion (sign HMAC with the public key), tamper, expiry, wrong key, unknownkid.DEFAULT_ALGORITHMSis asymmetric-only.IdentityResolver— bounded (timeouts + size cap) fetch ofjwks.json/vcs.json.vcs.jsonis returned raw (AGNTCY VC envelope still settling upstream per W3C VCDM 2.0); the cryptographic verify is the stable, standards-grounded core.agents-kt-identity(packageagents_engine.agntcy.identity) so the JOSE dependency stays out of core — theagents-kt-ragpattern. Lockfile + sha256 verification-metadata fornimbus-jose-jwt:10.3(no transitives).Gates
Full
./gradlew buildgreen across all modules (incl. the new module, detekt,DocsConsistencyTest, internals-agent validation, dependency-verification). 8 tests.README + CHANGELOG + PRD §12.6 + internals adjunct updated. Remaining #4517 subtasks: DIR client (#4520), OASF import/validate (#4519).
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