The outcome

Ensure consequential actions cannot run until a reviewer approves or safely edits their exact arguments.

LangGraph is a open-source orchestration framework and runtime for long-running stateful agents. Designing stateful agent workflows that require explicit control flow, durable checkpoints, streaming, recovery, memory, and human-in-the-loop decisions. This guide narrows that broad capability into one repeatable outcome, with checkpoints that keep the source material and your judgment in the loop.

Before you begin

Set the boundary before the tool starts.

Choose one real task, identify who will use the result, and decide what evidence or test will make the result acceptable. Gather only the source material needed for that task. If the work contains confidential, personal, regulated, or client-owned information, confirm that the platform and account are approved before sharing it.

Troiana principle

AI should make the work easier to inspect. If the workflow removes the source, the owner, or the review step, redesign the workflow.

Step by step

A workflow you can repeat.

  1. 01

    Place the interrupt immediately before the side effect and construct a review payload with action, arguments, impact, and source context.

  2. 02

    Persist the graph with a production checkpointer and bind each execution to authenticated user, tenant, and thread identifiers.

  3. 03

    Allow explicit approve, edit, or reject outcomes and validate edited arguments again before the action node runs.

  4. 04

    Test delayed review, rejection, duplicate decisions, expired authorization, process failure, replay, and attempted cross-thread access.

  5. 05

    Record the reviewer and decision separately from sensitive state, monitor pending interrupts, and rehearse recovery from the last checkpoint.

Working standard

What good use looks like.

  • Interrupt before the effect.
  • Revalidate edited arguments.
  • Prevent cross-tenant state access.

Durable replay can repeat model calls or external effects unless nodes are designed carefully. Protect persisted state, isolate tenants and threads, use idempotency, control checkpoint retention, and test every interruption and resumption path.

Official references

Check the current product documentation.

Features, plan limits, availability, and data controls change. These official pages are the starting points used for this collection.