LangGraph

Use UnifiedMemory before graph nodes that need durable context and after nodes that produce durable outcomes. Keep node-local scratch state in LangGraph; write only reusable facts, decisions, and tool outcomes to UnifiedMemory.

Pattern

• Use agent/context before a node or subgraph that needs memory.
• Stamp source_app=langgraph, a stable agent_id, and a run_id.
• Use agent/writeback after useful work completes.
• Keep graph handoffs explicit with allowed memory refs.

Safety

Each graph actor should have its own scoped key or stable agent_id. Shared facts must be promoted through trust gates before another actor sees them.