Google ADK Context Engineering: Treat Context as Compiled View Over Session/Memory/Artifacts Tiers — Strict Scoped Handoffs for Multi-Agent Reliability

Google Developers Blog·medium signal

Google's ADK architecture blog introduces tiered context engineering for multi-agent systems. Context is a compiled view over three tiers: Session (current conversation), Memory (persistent knowledge), and Artifacts (files/outputs). Two multi-agent patterns: 'Agents as Tools' (focused prompt in, result out, no history shared) vs 'Agent Transfer' (full context handoff). Explicit processors handle transformation, compaction, and caching at each tier boundary.