Hello, Goal: Time-travel to before the graph interruption and provide a different resume value. Current behaviour: I have this graph: const graph = new StateGraph(MessagesAnnotation) .addNode("model_node", async (state) => { const model = this.getModel(); const result = awa…

hi @KDKHD do you want a “dirty” solution or as idiomatic as possible? :slight_smile:

[image] pawel-twardziak: idiomatic as possible hey @pawel-twardziak idiomatic as possible pls :slight_smile:

Hey @pawel-twardziak , Do you know if it is actually possible to time-travel to before an interruption in an idomatic way?

Hi @KDKHD I have some findings already. I need to clarify them and answer, probably today.

My findings: Why the scratchpad hack “works” but is unsafe works because it clears the in‑memory resume list before interrupt() looks at it, forcing the runtime to fall back to the “null resume” coming from the current Command. But __pregel_scratchpad is an internal implementation detail used to co…

[image] pawel-twardziak: resumeMap Thank you @pawel-twardziak for this write-up! This is really interesting. Pattern 2 is very creative! Ill implement them asap and see how they work in practice. Resume_map is something new I learned today.

Sure :slight_smile: Let’s investigate more if needed!

Hey @pawel-twardziak , I don’t think the resumeMap works in js. In the following example, the final log still contains “What is 1 + 1”. Full code is here: GitHub - KDKHD/interrupt_test import { StateGraph, END, START, interrupt, messagesStateReducer, StateSnapshot, Command, Annotation } from "@lan…

Also, if the interrupt happens in a subgraph, how does one retrieve a checkpoint from that subgraph interrupt? app.getStateHistory(config)only returns data from the parent graph. This means, if I want to provide a checkpoint ID while resuming, I can only resume to the specific node in the parent gra…

How to time travel to before interrupt and resume with a different value?

OSS Product Help LangGraph

pawel-twardziak December 12, 2025, 9:58am 4

hi @KDKHD sorry for the late response, was overwhelmed with work. Will answer this weekend

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How to time travel to before interrupt and resume with a different value?

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