langchain-human-in-the-loop

Pause LangChain agent execution for human approvals and edits.

3|1|Updated Jan 31, 2026

Search Tags:#agent #resume #human-in-the-loop #workflow-automation #hitl #tool-calls #interrupts

Ready to run

npx skills add https://github.com/christian-bromann/langchain-skills --skill langchain-human-in-the-loop

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: langchain-human-in-the-loop
Source: https://github.com/christian-bromann/langchain-skills/tree/main/skills/langchain-human-in-the-loop/python
Command: npx skills add https://github.com/christian-bromann/langchain-skills --skill langchain-human-in-the-loop

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Human-in-the-Loop (HITL) workflows pause agent execution to collect approvals, edits, or rejections before continuing, enabling safer and more accountable automation.

Core Features & Use Cases

Interrupt-driven approvals: pause on selected tool calls until a human decision is provided.
Edit or reject tool calls: modify parameters or halt flows based on reviewer feedback.
Resume workflow with a Command: restart agent execution using a structured resume decision.
Async and streaming support: handle long-running tasks while awaiting decisions.
Use cases: approving data deletions, gating external API interactions, or complex multi-tool workflows.

Quick Start

Run a LangChain agent with HITL enabled to pause for human approval, then resume after a decision is provided.

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

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

FAQPage Schema

How do I pause a LangChain agent for human approval before it executes a tool call?▼

To pause a LangChain agent for human approval, you configure an interrupt-on tool pattern that halts execution before selected tool calls. This human-in-the-loop mechanism waits for a human decision before allowing the action to proceed.

How do I resume a LangChain workflow after an interrupt?▼

You resume a LangChain workflow after an interrupt by passing a structured Command object containing the human's decision. This Command-based resume restarts execution while maintaining consistent thread IDs across invocations.

What is human-in-the-loop workflow automation in LangChain used for?▼

Human-in-the-loop workflow automation in LangChain is used for pausing agent execution to collect approvals, edits, or rejections. It is essential for sensitive operations like data deletions, gating external API interactions, or managing complex multi-tool workflows.

Do I need a checkpointer to enable human-in-the-loop interrupts in LangChain?▼

Yes, you need a checkpointer to enable human-in-the-loop interrupts. The checkpointer handles state persistence, allowing the agent to pause execution and maintain its state while awaiting human review decisions.

Can I edit or reject tool call parameters during a LangChain agent workflow?▼

Yes, you can edit or reject tool call parameters during a LangChain agent workflow. The interrupt mechanism allows reviewers to modify parameters or completely halt flows based on their feedback before the action proceeds.

Does LangChain human-in-the-loop support async and streaming for long-running tasks?▼

LangChain human-in-the-loop supports async and streaming to handle long-running tasks. This allows the agent to await human decisions asynchronously without blocking execution resources.