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langgraph-human-in-the-loop

Implement interrupt-based human approval and resume workflows in LangGraph agents.

Updated May 1, 2026
Search Tags:#agent#resume#langgraph#human-in-the-loop#approval workflow#interrupt#checkpointer
One-click install
npx skills add https://github.com/ricardoo022/4dill --skill langgraph-human-in-the-loop-ricardoo022
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langgraph-human-in-the-loop
Source: https://github.com/ricardoo022/4dill/tree/main/.gemini/skills/langgraph-human-in-the-loop
Command: npx skills add https://github.com/ricardoo022/4dill --skill langgraph-human-in-the-loop-ricardoo022

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? LangGraph agents that need human approval, review, or input mid-execution require correct use of interrupt(), Command(resume=...), checkpointers, and thread IDs, and mistakes cause duplicate side effects, stuck graphs, or lost state. ## Core Features & Use Cases - Interrupt and Resume Patterns: Pause graph execution with interrupt() and resume with Command(resume=...) using a checkpointer and thread ID. - 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 node re-execution and avoid antipatterns like passing Command(update=...) as invoke input. - Use Case: When building an email-drafting agent that must pause for a human to approve or edit the draft before sending, use this Skill to wire the interrupt, route on the decision, and avoid duplicate audit-log writes on resume. ## Quick Start Ask the AI to add a human approval step to your LangGraph agent that pauses with interrupt() 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), and the resume value becomes the return value of interrupt().

How to resume a LangGraph interrupt correctly?▼

Resume by passing Command(resume=...) to invoke or stream with the same thread_id used originally. Passing a plain dict restarts the graph instead of resuming, and Command(update=...) as input leaves the graph appearing stuck.

Why does LangGraph interrupt fail without a checkpointer?▼

Interrupts require a checkpointer to save state while paused, so compile the graph with InMemorySaver for development or PostgresSaver for production. You must also pass a thread_id in the config on every invoke or stream call.

Why does my LangGraph node create duplicate records after resume?▼

When a graph resumes, the node restarts from the beginning, so all code before interrupt() re-runs. Use upsert or check-before-create operations before interrupt(), or move side effects to after the interrupt call.

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

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

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