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langgraph-human-in-the-loop

Implements interrupt and resume patterns for human approval workflows in LangGraph.

Updated Jan 10, 2026
Search Tags:#langchain#agent#LangGraph#human-in-the-loop#approval workflow#interrupt#checkpointer
One-click install
npx skills add https://github.com/orezek/monorepo_template --skill langgraph-human-in-the-loop-orezek
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langgraph-human-in-the-loop
Source: https://github.com/orezek/monorepo_template/tree/main/.agents/skills/langgraph-human-in-the-loop
Command: npx skills add https://github.com/orezek/monorepo_template --skill langgraph-human-in-the-loop-orezek

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Building LangGraph agents that pause for human approval, review, or input is error-prone: missing checkpointers, wrong resume calls, and duplicated side effects cause stuck graphs and corrupted state. This Skill provides correct, tested patterns for pausing and resuming graph execution safely. ## Core Features & Use Cases - Interrupt and Resume: Pause execution with interrupt(value) and resume with Command(resume=value), with working examples in both Python and TypeScript. - Approval and Validation Workflows: Route based on human decisions, validate human input in re-prompt loops, and resume multiple parallel interrupts via ID-mapped resume values. - Idempotency and Error Guidance: Prevent duplicate side effects on resume, handle subgraph re-execution, and avoid common mistakes like passing Command(update=...) as invoke input. - Use Case: You are building an email agent that drafts replies. Use this Skill to interrupt before sending, surface the draft to a human, and route to send or discard based on their edited response. ## Quick Start Ask the AI to add a human approval step to your LangGraph agent that pauses with interrupt, shows a draft for review, and resumes with the reviewer's 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 a LangGraph agent for human approval?▼

Call interrupt(value) inside a node to pause execution and surface a payload to the caller. Resume by invoking the graph with Command(resume=value), which returns that value from the interrupt call. A checkpointer and thread_id are required.

How to resume a LangGraph interrupt in TypeScript?▼

Resume a LangGraph interrupt by calling graph.invoke with new Command({ resume: value }) and the same thread_id config. Passing a plain object restarts the graph instead of resuming, so always use Command for resume input.

Why does my LangGraph interrupt fail without a checkpointer?▼

Interrupts require a checkpointer to save state while paused. Compile the graph with checkpointer=InMemorySaver() for development or PostgresSaver for production, otherwise the interrupt functionality will fail.

Why does code before interrupt() run twice in LangGraph?▼

When a graph resumes, the node restarts from the beginning, so all code before interrupt() re-executes. Use upsert or check-before-create patterns, or move side effects after the interrupt, to avoid duplicate records.

Can I resume multiple parallel interrupts at once in LangGraph?▼

Yes, resume multiple parallel interrupts in one invocation by passing Command(resume=...) with a map of each interrupt ID to its resume value. The pending interrupts are listed in the result under __interrupt__ with their IDs.

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