Unclassified

11 · Communication Bridge

The mechanism through which Spine, AI runtimes, agents, workflows, and systems communicate around work

The mechanism through which everything communicates around work.

The Communication Bridge is not merely connectivity. It is the architectural layer through which Spine, AI runtimes, agents, workflows, and execution systems communicate around work.

Communication Bridge Model

                     SPINE
                       │
             Context / Work / State
                       │
                       ▼
               COMMUNICATION BRIDGE
                       │
          ┌────────────┼────────────┐
          │            │            │
         ADK      ORCHESTRATOR     ACP
          │            │            │
          └────────────┼────────────┘
                       │
                 AGENT RUNTIME
                       │
              ┌────────┼────────┐
              │        │        │
             MCP    Workflow   API
              │        │        │
              └────────┼────────┘
                       ▼
                  EXECUTION

Protocol Separation

Protocol	Purpose
MCP	AI ↔ Tool / Resource
ACP	Agent ↔ Agent / Twin ↔ Agent
Spine	Shared governed business context
Bridge	Communication and controlled context exchange
Orchestrator	Coordination
ADK	Agent execution/runtime abstraction
Execution Fabric	Actual mechanisms that perform work

Communication Channels

Human ↔ System

Channel	Description
Team Chat	Internal team messaging
Customer Communications	External customer-facing messages
Email	Email integration and management
Meetings	Meeting notes, action items, follow-ups
Announcements	Organization-wide communications

AI ↔ System

Channel	Description
MCP	Tool and resource invocation
API Calls	Direct API interactions
Webhooks	Event-driven communication
Event Streaming	Real-time data feeds

Agent ↔ Agent

Channel	Description
ACP	Agent-to-agent communication protocol
Orchestrator	Centralized coordination
Shared Context	Spine-mediated context exchange

Event Model

Every communication becomes a Spine event:

interface CommunicationEvent {
  id: string;
  tenantId: string;
  channel: string;
  direction: 'inbound' | 'outbound' | 'internal';
  from: ActorRef;
  to: ActorRef[];
  body: string;
  workItemRef?: string;
  entityRef?: string;
  timestamp: string;
}

Communication Bridge Connects to

Layer	Relationship
Spine Fabric	Exchanges context and state
Human Workbench	Delivers communications to users
Twin Workbench	Enables Twin communication
Agents	Facilitates agent communication
Execution	Connects to execution systems
Source Systems	Bridges to external systems