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LangGraph Persistence — Checkpointer & Cross-Thread Store

Status: 🟢 In-use Category: Architecture & Design Date: February 26, 2026

Overview​

Implemented full LangGraph persistence with two complementary layers: (1) per-thread Checkpointer for conversation state within a thread, including auto-trimming and orphan repair; and (2) cross-thread Store for long-term user-scoped memory that persists across threads.

Motivation​

Without persistence, the agent loses all state on restart, threads are isolated with no carryover, and users must re-explain context in every conversation.