LangChain Middleware
Skill VerifiedINVOKE THIS SKILL when you need human-in-the-loop approval, custom middleware, or structured output. Covers HumanInTheLoopMiddleware for human approval of dangerous tool calls, creating custom middleware with hooks, Command resume patterns, and structured output with Pydantic/Zod.
This skill provides middleware capabilities for LangChain agents, including human-in-the-loop approval workflows, custom interception logic for tool calls, and patterns for resuming execution after human decisions. It supports both Python and TypeScript environments and requires a checkpointer for its Human-in-the-Loop features.
Versioning
- warning:Release ManagementNo version information (manifest, release tags, CHANGELOG) is present in the repository, and installation references the main branch.
Installation
First, add the marketplace
/plugin marketplace add langchain-ai/langchain-skills/plugin install langchain-skills@langchain-skillsSimilar Extensions
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LangChain Fundamentals
88Create LangChain agents with create_agent, define tools, and use middleware for human-in-the-loop and error handling.
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100Scaffold an editable Tandem control panel app
ESLint Plugin React Hooks
99ESLint rules for React Hooks
Prisma Postgres Setup
99Set up a new Prisma Postgres database and connect it to a local project using the Management API. Use when asked to "set up a database", "create a Prisma Postgres project", "get a connection string", "connect my app to Prisma Postgres", or "provision a database".