Google Agentic Architect - Subconcept 1.3: Inter-Agent Protocols & Context Slicing

Detail how multi-agent systems communicate and maintain context sanity without flooding context windows. Deep dive into the Agent-to-Agent (A2A) protocol using typed, secure Pydantic message envelopes (like A2AMessageEnvelope). Explain the Model Context Protocol (MCP) as a standardized, JSON-RPC-based protocol over stdio or Server-Sent Events (SSE) that connects tools and prompts across container boundaries. Finally, explain the critical engineering concept of "Context Slicing"—the practice where a supervisor extracts and forwards only the specific parameters a child agent needs, stripping out raw conversational histories and parent variables to minimize token bloat and context drift.