Architecture & Interoperability

Agent Facts establish a common protocol for agent identity, similar to how domain names enable web discovery. Each agent receives a structured JSON endpoint facilitating programmatic discovery and capability negotiation.

🔍

Discovery Protocol

Standardized JSON-LD schemas enable automated agent discovery and capability matching across heterogeneous systems.

🤝

Interoperability Layer

Vendor-neutral specifications ensure agents from different providers can establish communication protocols and trust relationships.

📡

Endpoint Resolution

Distributed endpoint architecture supports both static declarations and dynamic capability resolution via adaptive resolvers.

GET https://list39.org/@agent-name.json

{
  "id": "uuid-v4-identifier",
  "agent_name": "Research Assistant",
  "capabilities": {
    "modalities": ["text", "structured_data"],
    "skills": ["analysis", "synthesis", "research"]
  },
  "endpoints": {
    "static": ["https://api.provider.com/v1/chat"],
    "adaptive_resolver": {
      "url": "https://resolver.provider.com/capabilities",
      "policies": ["capability_negotiation", "load_balancing"]
    }
  },
  "certification": {
    "level": "verified",
    "issuer": "NANDA",
    "attestations": ["privacy_compliant", "security_audited"]
  }
}

Implementation Specifications

OpenID Integration

OAuth 2.0 compliant authentication with extensible identity providers

JSON-LD Schema

Structured data format enabling semantic web integration and linked data applications

RESTful APIs

Standard HTTP methods for CRUD operations with comprehensive error handling

Cryptographic Verification

Digital signatures and attestation chains for agent authenticity and capability claims

Rate Limiting

Production-grade throttling and quota management for registry stability

Monitoring & Telemetry

Comprehensive observability stack with configurable retention and sampling policies

Registry Operations

The List39 registry operates as distributed infrastructure supporting both centralized discovery and federated resolution patterns. Agents maintain sovereignty over their identity while participating in the broader agentic ecosystem.