docs: RFC-008 delegation chains, envelope APIs, and May 2026 updates#43
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New pages: - concepts/delegation.md: Authority Envelopes & Delegation Chains concept - how-to/security/delegation-chains.md: Step-by-step delegation chain guide Updated references: - reference/grpc.md: Add 4 envelope RPCs (CreateEnvelope, DeriveEnvelope, BuildTransportHeaders, VerifyEnvelopeChain) and SimpleGuardService to service overview - reference/sdk-python/simple-guard.md: Add create_envelope(), derive_envelope(), make_delegation_headers() docs - reference/sdk-python/mcp.md: Add structured rejection fields (error_code, rejection_detail, requested/presented_capability) and scope_insufficient deny reason (RFC-008 B8) - reference/server/policy-enforcement.md: Add EnvelopeVerification config (CAPISCIO_MAX_CHAIN_DEPTH, CAPISCIO_ORG_TRUST_BOUNDARY), chain headers, chain verification error codes, PDP enrichment fields Updated guides: - identity/index.md: Show connect() zero-argument env var fallback - how-to/security/gateway-setup.md: Add chain verification config section - how-to/security/badge-keeper.md: Document automatic CA→PoP mode upgrade - mcp-guard/guides/evidence.md: Add GuardEventEmitter and policy_enforced event emission on deny Nav: - Add 'Delegation Chains' to Concepts and How-To > Security sections
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Summary
Documents RFC-008 Authority Envelopes (Delegation Chains) across the documentation suite — new concept and how-to pages, plus reference updates for gRPC, Python SDK, MCP Guard, and server PEP.
New pages
Updated references
create_envelope(),derive_envelope(),make_delegation_headers()with full parameter tableserror_code,rejection_detail,requested_capability,presented_capability) +scope_insufficientdeny reasonUpdated guides
connect()env var fallbackNav
Verification