Security Overview

Nexus OS is designed with security as a core principle. Every component follows the principle of least privilege.

Security Model

Nexus OS uses a layered security model:

┌─────────────────────────────────┐
│  Application Layer              │
│  Agent code + business logic    │
├─────────────────────────────────┤
│  Orchestration Layer            │
│  Supervisors, Sagas, Workflows  │
├─────────────────────────────────┤
│  Sandbox Layer                  │
│  WASM isolation + syscall filter│
├─────────────────────────────────┤
│  Storage Layer                  │
│  Encrypted SQLite + audit trail │
└─────────────────────────────────┘

Key Security Features

  • WASM Sandboxing — Agents run in isolated WebAssembly sandboxes with no direct filesystem or network access
  • AXIS Trust Verification — Cryptographic verification of agent identity and capabilities
  • Audit Trail — Every action is logged with timestamps, agent IDs, and details
  • Cost Controls — Budget enforcement prevents runaway spending
  • Credential Isolation — API tokens and secrets are never exposed to agent code

Threat Model

Threat Mitigation
Malicious agent code WASM sandbox prevents escape
Credential theft Secrets injected at runtime, never stored in agent code
Cost attacks Per-agent budgets with hard limits
Data exfiltration Network access controlled by sandbox policy
Privilege escalation No root access, minimal syscall surface