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langgraph-human-in-the-loop

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

Updated Jul 16, 2026
Search Tags:#agent#resume#langgraph#human-in-the-loop#approval workflow#interrupt#checkpointer
One-click install
npx skills add https://github.com/flemx/salesforce-langgraph-agent --skill langgraph-human-in-the-loop-flemx
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langgraph-human-in-the-loop
Source: https://github.com/flemx/salesforce-langgraph-agent/tree/main/.agents/skills/langgraph-human-in-the-loop
Command: npx skills add https://github.com/flemx/salesforce-langgraph-agent --skill langgraph-human-in-the-loop-flemx

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Building agents that pause for human approval, review, or input is error-prone: developers often forget checkpointers, resume with plain dicts instead of Command(resume=...), or create duplicate records because code before interrupt() re-runs on every resume. This Skill provides correct, tested patterns for pausing and resuming LangGraph execution. ## Core Features & Use Cases - Interrupt and Resume Patterns: Pause graph execution with interrupt(value) and resume with Command(resume=value), including resuming multiple parallel interrupts via an ID-to-value map. - Approval and Validation Workflows: Route based on human decisions (approve/edit/reject) and loop with re-prompts until human input passes validation. - Idempotency Guidance: Rules and examples for keeping side effects safe when nodes re-execute on resume, including subgraph re-execution behavior. - Use Case: You are building an email-drafting agent that must wait for a human to approve or edit each draft before sending. Use this Skill to wire interrupt(), a checkpointer, and thread IDs correctly so the graph pauses, surfaces the draft, and resumes with the human's decision. ## Quick Start Add a human approval step to my LangGraph agent that pauses with interrupt() before sending and resumes with the reviewer's decision using Command(resume=...).

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 do I resume a LangGraph interrupt in Python?▼

Pass Command(resume=your_value) as the input to graph.invoke() with the same thread_id config. Passing a plain dict restarts the graph instead of resuming the paused execution.

Why does my LangGraph interrupt fail or the graph appear stuck?▼

Interrupts require a checkpointer such as InMemorySaver and a thread_id in the config on every call. Also, passing Command(update=...) as invoke input resumes from the latest checkpoint and makes the graph appear stuck.

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, including parent nodes of subgraphs. Use upserts or place side effects after interrupt() to avoid duplicate records.

How do I resume multiple parallel interrupts at once?▼

Build a map from each interrupt's id to its resume value using the Interrupt objects in the result's __interrupt__ field, then pass it as Command(resume=resume_map). All pending parallel branches resume in a single invocation.

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