After upgrading LangGraph, interrupt() inside an agent tool is not surfaced when streaming with stream_mode="values"

After upgrading langgraph-prebuilt from 0.2.2 to 0.5.0, a create_react_agent tool that calls interrupt() for human input no longer surfaced the interrupt in astream output with stream_mode="values", so the run ended without pausing for the human. Downgrading restored the behaviour; the maintainers reverted an earlier change that had stopped emitting interrupts for the values stream mode.

Framework / agent

LangGraph · ReAct tool-calling agent with human-in-the-loop tool

Remediation attempts

SUGGESTEDTESTED

Recurrence

not documented

Source languages

en

Updated

2026-09-29

Sources

• GITHUB ISSUE When prebuilt==0.2.2 upgraded to 0.5.0, `interrupt` in tool doesn't work, it caused loop exited. — github.com/langchain-ai/langgraph, retrieved 2026-09-29
• GITHUB PULL REQUEST revert(langgraph): restore logic to surface interrupts for stream_mod… — github.com/langchain-ai/langgraph, retrieved 2026-09-29

Symptoms

• The agent loop exits instead of pausing when a tool calls interrupt()
• With stream_mode="values", the interrupt message does not appear in the streamed events

Similarity to your system is not implied. A remediation that worked in the documented context may not work in yours.