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langgraph-human-in-the-loop

Pause LangGraph execution for human approval and resume with decisions.

Updated May 26, 2026
Search Tags:#checkpointing#langgraph#human-in-the-loop#approval workflow#interrupt#stateful graphs
One-click install
npx skills add https://github.com/anukkrit149/anukkrit-skills --skill langgraph-human-in-the-loop-anukkrit149
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langgraph-human-in-the-loop
Source: https://github.com/anukkrit149/anukkrit-skills/tree/main/cloud/skills/langgraph-human-in-the-loop
Command: npx skills add https://github.com/anukkrit149/anukkrit-skills --skill langgraph-human-in-the-loop-anukkrit149

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It solves the challenge of implementing human-in-the-loop workflows in LangGraph, where execution must pause for review and then resume safely with the human-provided decision or data.

Core Features & Use Cases

  • Interrupt/Resume mechanics: Use interrupt(value) to pause and surface a review payload, then resume via Command(resume=value) with the returned result mapped back to interrupt().
  • Correct runtime requirements: Ensures you include a checkpointer, pass the required thread_id in configurable, and send JSON-serializable interrupt payloads.
  • Approval & validation patterns: Supports common designs like approval routing, validation loops that re-interrupt until valid input, and handling multiple simultaneous interrupts by ID mapping.
  • Safety guidance for re-execution: Explains idempotency rules and how code prior to interrupt() re-runs on resume, including the subgraph re-execution caveat.

Quick Start

Use langgraph-human-in-the-loop to design an interrupt-based approval flow that pauses a graph for a human to review a draft and then routes execution based on the approval decision.

Frequently Asked Questions about langgraph-human-in-the-loop

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I pause LangGraph execution for human approval?▼

You can implement human-in-the-loop control flow in LangGraph by using the interrupt() function to pause execution and surface a review payload, then resuming via Command(resume=value) with the human decision.

What do I need to set up human-in-the-loop workflows in LangGraph?▼

To implement human-in-the-loop workflows in LangGraph, you need a checkpointer to save state, a stable thread_id in the configurable settings of every invoke or stream call, and JSON-serializable interrupt payloads.

Can I handle multiple simultaneous interrupts in a stateful LangGraph?▼

Yes, you can handle multiple simultaneous interrupts in a stateful LangGraph by using ID mapping to manage different interrupt points and routing execution based on the specific approval or validation requirements.

Why does code before the interrupt function re-run when LangGraph resumes?▼

Code prior to interrupt() re-runs on resume in LangGraph due to the stateful graph's idempotency rules, meaning you must design your subgraph re-execution logic carefully to avoid unintended side effects.

How do I create a validation loop that re-prompts until valid input is received?▼

You can create a validation loop in LangGraph by using interrupt() to pause for user input and re-interrupting if the input is invalid, ensuring the stateful graph continues to prompt until the validation criteria are met.

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