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Multi-Agent Communication Protocols
12.1Why Communication MattersWhen agents need to share information, the communication protocol determines whether the system works or fails. Poor protocols lead to…12.2The Message ProtocolThe correlation_id is essential for debugging multi-agent systems. It ties together all messages related to a single task:12.3Error PropagationWhen one agent fails, the system must handle it gracefully. There are three strategies:12.4Communication PatternsEach agent passes output to the next. Simple and predictable.12.5Standard Protocols: MCP and A2A (as of July 2026)The custom message bus above is still the right choice inside a single testing system you control. But across system boundaries, the…12.6Monitoring Multi-Agent Communication12.7Key TakeawayMulti-agent communication protocols determine system reliability. Use structured messages with correlation IDs for tracing, implement error…