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langchain-middleware

Coordinate human-in-the-loop approvals for dangerous LangChain tool calls.

Updated Oct 27, 2024
Search Tags:#middleware#langchain#resume#examples#approval#hitl#tool-call
One-click install
npx skills add https://github.com/TimMoyence/Innov-mind-museum --skill langchain-middleware-timmoyence
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langchain-middleware
Source: https://github.com/TimMoyence/Innov-mind-museum/tree/main/.claude/skills/langchain-middleware
Command: npx skills add https://github.com/TimMoyence/Innov-mind-museum --skill langchain-middleware-timmoyence

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Human-in-the-loop decision making is essential for safe tool use in AI agents; this skill provides a reusable HITL middleware to pause, inspect, and resume tool calls within LangChain.

Core Features & Use Cases

  • HumanInTheLoopMiddleware / humanInTheLoopMiddleware: Pause before dangerous tool calls for human approval
  • Custom middleware: Intercept tool calls for error handling, logging, retry logic
  • Command resume: Continue execution after human decisions (approve, edit, reject) Requirements: Checkpointer + thread_id config for all HITL workflows.

Quick Start

Configure the HITL middleware in your LangChain agent and define per-tool interrupt policies to pause for human approval.

Frequently Asked Questions about langchain-middleware

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

FAQPage Schema
How do I add human-in-the-loop approval to LangChain tool calls?▼

To resume a LangChain agent after human-in-the-loop, you use a command resume workflow that passes the human decision back, continuing execution from the exact paused state using checkpointer and thread_id tracking.

Can I intercept LangChain tool calls for custom error handling and logging?▼

Yes, you can define per-tool interrupt policies in LangChain by configuring the middleware to target specific dangerous tools, ensuring only high-risk actions require human approval while others proceed automatically.

Do I need a checkpointer to use human-in-the-loop workflows in LangChain?▼

A checkpointer is required for human-in-the-loop workflows in LangChain because it persists the agent state during the pause, and thread_id config is necessary to track and resume the specific execution thread.

What are the decision options when a human-in-the-loop middleware pauses a tool call?▼

Decision options when a middleware pauses a tool call include approve, edit, and reject, allowing the human to authorize the action, modify the parameters, or cancel the tool execution entirely.

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