LangChain Middleware & HITL

What problem does it solve?

This Skill addresses the need for robust error handling, user-controlled execution, and structured output in production LangChain applications, ensuring safer and more reliable agent behavior.

Core Features & Use Cases

• Human-in-the-Loop (HITL): Enables human approval for critical or sensitive tool calls, preventing unintended actions.
• Custom Middleware: Allows interception of tool calls for logging, retries, or custom logic.
• Command Resume: Provides mechanisms to resume agent execution after human decisions (approve, edit, reject).
• Structured Output: Facilitates generating outputs in predefined formats using Pydantic or Zod.

Quick Start

Configure an agent with HumanInTheLoopMiddleware to pause before sending emails for approval.