Protocol Atlas for Hybrid AI Native Systems

Protocol Atlas

A structured map of the protocols, standards, and technical layers shaping hybrid AI-native systems.

Layered ecosystem view

The current stack is best understood as complementary layers, not as a flat list of competing protocols.

Layer 1 — Web and cloud foundations

HTTP, OpenAPI, OAuth, SPIFFE, OpenTelemetry, OCI

Layer 2 — Tool and context access

MCP and adjacent tool-access patterns

Layer 3 — Agent-to-agent collaboration

A2A and agent coordination contracts

Layer 4 — Surface and interaction

ACP, A2UI, AG-UI, surface-specific protocols

Layer 5 — Commerce and transaction

UCP, AP2, and other emerging transaction layers

Layer 6 — Hybrid execution and governance

HAINP, focused on execution domains, locality, routing, fallback, portability, and audit continuity

Why this atlas matters

The protocol problem is no longer “which single protocol wins.” It is how multiple protocol families compose into a workable stack for hybrid AI-native systems.

HAINPRO treats the ecosystem as a stack that still lacks a disciplined execution and governance layer across local, edge, private, and cloud environments.