Agentic AI Reference Architecture

Orchestration · Data store

Shared Message History

Data storeOrchestrationOrchestration & Toolsarc:SharedMessageHistory

An append-only conversation transcript shared by all participants in a multi-agent dialogue, holding every agent's messages as the common coordination context.

Responsibility. Holds the ordered messages of a multi-agent conversation for all participants to read.

Also known as: Group chat history, Shared conversation history, Message history

is read by; is written byis read by; is written byis written byis read byis written byis read byWorker Agent: is read by; is written byWorker AgentDual-Agent Critic: is read by; is written byDual-Agent CriticAgent Message Bus: is written byAgent Message BusReasoning Consistency Checker: is read byReasoning Consistency Ch…Conversational Agent Coordinator: is written byConversational Agent Coo…Termination Checker: is read byTermination Checker
Direct neighbourhood (hover for relationship types)

Relationships

is read by dependency

is written by dependency

Design guidance

Classification

Patterns
Message passingShared conversational context
Technologies
AutoGen
Quality attributes
Transparency and accountability (NIST AI RMF: accountable and transparent)
Risks mitigated
Agents lacking visibility into others' contributions

Sources

  1. Ch2.4: T. Nguyen, "Multi-Agent Frameworks," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 2.4. ISBN: 9798244538229.
  2. Ch3.10: T. Nguyen, "Efficiency Metrics," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 3.10. ISBN: 9798244538229.