Start building sovereign agents today!

We just shipped the sovereign layer agentic AI has been missing. NEXUS-A2A v0.3 Open source. Apache 2.0. 189 tests. Zero external dependencies in the core suite. The fundamental problem with today's agent ecosystem isn't MCP, ACS, A2A, LangChain, CrewAI, or orchestration frameworks. The problem is that most systems can authenticate an application, but cannot reliably answer: • Which agent actually initiated this action? • What authority was delegated to it? • How many delegation hops occurred? • Was its memory manipulated since the last session? • Who owns responsibility for its actions? That is a structural governance gap, not a configuration problem. NEXUS closes that gap with a cryptographic sovereign layer that wraps existing agent infrastructure without requiring changes to MCP servers, ACS Guardians, LangChain, CrewAI, n8n, or other orchestration platforms. Core controls include: → DID + SPIFFE identity on every agent-to-agent message → Verifiable Constraint Chains (VCC) that narrow scope at every delegation hop → Memory Vaccine drift detection to block memory injection before persistence → Guardian enforcement of arguments outside the agent process → NOR receipts that create signed, OCSF-mapped audit records for every action The result is governance, provenance, and accountability that travel with the request itself. Using the AI SAFE² v3.0 framework: • Typical MCP deployments score ~11/25 • ACS implementations score ~14/25 • Current A2A implementations score ~8/25 • NEXUS-A2A v0.3 scores 24/25 The remaining point requires production-scale behavioral analytics over extended operational horizons. We believe every fleet operating 50+ autonomous agents should satisfy six invariants: I-1: Cryptographic identity at every boundary I-2: Scope narrows at every delegation hop I-3: Memory provenance on every cross-session write I-4: Physical kill switch registered with sub-second propagation I-5: Named human owner-of-record for every agent I-6: Behavioral drift treated as a security event You can verify your own environment today: pip install nexus-a2a-sdk Run the compliance checker and receive a control-by-control assessment showing exactly where governance gaps exist. NEXUS-TGC (multi-sovereign governance committee) is now accepting steering nominations through September 1, 2026. An IETF Internet-Draft for the identity and transport layers is in preparation. This is not a vendor lock-in strategy. This is an open protocol designed to make agent identity, delegation, memory provenance, and accountability verifiable across the emerging agentic ecosystem.