agent communication protocol

ACP is discussed as emerging standard for agent-to-agent communication, representing evolution beyond MCP toward standardized inter-agent context passing.

A2A (Agent2Agent Protocol) is an explicit implementation of how agents exchange context/information using web standards

Broadcast feature is infrastructure for defining how agents exchange information/context

Survey's discussion of coordination mechanisms directly addresses how agents communicate, which determines what context can flow between them.

Suggests that agent-LLM communication can be formalized/optimized separately from human-facing output, enabling protocol design as a context variable.