LangGraph Workflow Patterns Comprehensive patterns for building production LangGraph workflows. LangGraph 1.x is LTS (Long Term Support) — the first stable major release, powering agents at Uber, LinkedIn, and Klarna. Each category has individual rule files in loaded on-demand. LangGraph 1.2 (Q1 2026) — new in this bump: - Deferred nodes ( on ) — the node runs only after all other upstream nodes for the current super-step have completed, which makes "aggregate once everyone else is done" patterns a one-liner instead of a custom reducer. - Pre/post model hooks on and — inject compression, summ…