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NEXUS — Sovereign Infrastructure for Agents
Sovereign infrastructure for agents

Every agent can act.
Few can be trusted.

MCP connects agents to tools. ACS controls execution. NEXUS establishes sovereignty — cryptographic identity, scoped delegation, memory protection, and non-repudiable audit, underneath the stack you already run.

Install the SDK View on GitHub
Works with — no replacement, no lock-in
MCPACSA2An8nLangChainCrewAIOpenAIREST
guardian.py — your first protected agent
$ pip install nexus-a2a-sdk
# 10 lines. Sovereign agent governance.
 
from nexus_sdk.guardian import NEXUSGuardianClient
 
guardian = NEXUSGuardianClient(
fail_mode=NEXUSGuardianClient.FAIL_CLOSED,
)
verdict = guardian.evaluate(step)
 
verdict.decision # "allow" | "deny"
verdict.nor_fingerprint # non-repudiable evidence
 
✓ allow policy enforced before execution
189
tests passing
24/25
AI SAFE2 v3.0
L1 — L6
sovereign layers
Apache 2.0
vendor-neutral
The sovereignty layer

Wrap the protocols you already run.
Add what none of them provide.

Your existing agent stack
MCPACSA2An8nLangChainCrewAIOpenAI AgentsREST
NEXUS
Sovereignty Layer
Identity
Delegation
Memory
Governance
Auditability
01 — The problem nobody talks about

Your agents can already do everything. Except prove it.

Call tools
Access APIs
Route tasks
Execute workflows
Share context
Persist memory

But answer these questions:

Can you prove which agent performed an action?
Can you prove who authorized it?
Can you prove the memory wasn't manipulated?
Can you prove delegated permissions weren't expanded?
Can you prove a tool execution violated policy?
Can you produce evidence after an incident?
Most organizations cannot.
None of the major connectivity protocols were designed to solve these problems.
02 — Connectivity is solved

Sovereignty is not.

Every connectivity protocol gets agents talking. None of them establish who an agent is, what it may do, or whether it can be held to account.

Capability MCP ACS A2A NEXUS
Tool Connectivity
Agent Identity
Scoped Delegation
Memory Governance
Cryptographic Provenance
Audit Chain
Constitutional Controls
NEXUS does not replace MCP, ACS, or A2A.
It wraps them.
The same way TLS didn't replace HTTP. It made HTTP trustworthy.
03 — Why developers adopt NEXUS

Security shouldn't require rebuilding everything.

You already invested in your stack. NEXUS works with all of it.

MCP serversACS Guardiansn8n workflowsCrewAI agentsLangChain systemsOpenAI integrations
No migration No rewrites No protocol fork No proprietary cloud dependency
01

Install

One pip install drops the SDK into the environment you already run. No infrastructure to stand up.

02

Wrap

NEXUS sits underneath your existing protocols and agents. Your architecture stays exactly as it is.

03

Enforce

Identity, delegation, memory, and policy execute at runtime. Blocked before execution, not after the incident.

04 — What NEXUS adds

Five layers of sovereignty, enforced in protocol.

Identity

Every agent receives a verifiable identity. Not a string. Not a label. A cryptographically verifiable entity.

Delegation

Permissions can narrow. They can never expand. Every delegated action becomes provable.

Memory Protection

Agent memory becomes governed infrastructure. Every write validated. Every change attributable. Every manipulation becomes detectable.

Governance

Policies move from documentation to enforcement. Controls execute at runtime. Not after the incident. Before it.

Auditability

Every action generates evidence. Every decision becomes traceable. Every workflow becomes explainable.
Transport → Identity → Policy → Memory → Economic → Governance Six layers. One sovereign protocol.
See the architecture
05 — For MCP users

Your MCP servers have no idea which agent is calling them.

MCP is excellent at connectivity. It was never designed to establish sovereign identity. NEXUS adds it without modifying your MCP architecture.

Protect your MCP ecosystem
  • Agent identity
  • Delegation controls
  • Provenance tracking
  • Policy enforcement
  • Audit chains

Without modifying your MCP architecture.

  • Cryptographic identity
  • Memory governance
  • Delegation attenuation
  • Constitutional constraints
  • Non-repudiable evidence

Without breaking ACS compatibility.

06 — For ACS users

ACS gets the hard part right.

ACS introduced policy enforcement through Guardians. NEXUS extends that model with the sovereignty layer ACS leaves open.

Deploy the NEXUS ACS bridge
07 — For n8n, LangChain & agent builders

You built automation.
Now build accountability.

Every workflow eventually reaches the same question: who approved this action?
And immediately after: can we prove it?
NEXUS makes the answer yes.
Works with
n8nLangChainCrewAIOpenAI AgentsCustom Python AgentsInternal Platforms
08 — Frequently asked questions

The short answer is almost always no rebuild.

No. NEXUS runs underneath MCP. Your servers and clients keep working exactly as they do today.
No. NEXUS works independently or alongside ACS through the ACS bridge.
No. Existing workflows continue to function. NEXUS adds governance without altering execution paths.
No. NEXUS is not an orchestrator. It is a sovereignty layer that sits beneath whatever orchestrator you already run.
No. NEXUS is protocol-neutral by design and licensed under Apache 2.0.
No. Deploy locally, privately, or in your own infrastructure. No mandatory hosted service.
Yes. NEXUS was designed around governance, accountability, evidence generation, and the operational controls required by modern AI governance frameworks.
Minutes. Developers can install the SDK and begin integrating immediately.
09 — The future of agentic AI

It is not more agents.
It is accountable agents.

Every year the industry builds more powerful agents. Very few people are building the mechanisms to govern them. The organizations that win will not be the ones with the most automation. They will be the ones that can trust it.

Policy is intent.
Engineering is reality.
Start building sovereign agents today

Install NEXUS. Wrap your stack.
Add sovereignty.

Add identity, governance, memory protection, and auditability without rebuilding your architecture.

$ pip install nexus-a2a-sdk
Start using NEXUS View documentation Explore MCP integration
Sovereign infrastructure for the agents you already use.
Install SDK Protect MCP
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