langchain

Orchestrate LLMs and external tools to create Python agents for multi-step tasks.

8|1|Updated Feb 28, 2026
One-click install
npx skills add https://github.com/belos-street/skill-kit --skill langchain-belos-street
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: langchain
Source: https://github.com/belos-street/skill-kit/tree/main/skills/langchain
Command: npx skills add https://github.com/belos-street/skill-kit --skill langchain-belos-street

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

LangChain simplifies the complex work of composing language models, tools, memory, and streaming into reliable agents so developers can build multi-step, tool-enabled AI workflows without reinventing orchestration and integration patterns.

Core Features & Use Cases

  • Agent Creation: Unified create_agent interface for composing models, tools, and middleware.
  • Model & Provider Integration: Connect OpenAI, Anthropic, Google, Azure, and other providers with configuration and fallback patterns.
  • Tools & RAG: Define deterministic tools, runtime tool registration, and retrieval-augmented generation pipelines for knowledge-backed answers.
  • Memory & Streaming: Short-term memory management, summarization middleware, and streaming output for real-time user experiences.
  • Middleware & Safety: Error handling, logging, human-in-the-loop approvals, and retry/circuit-breaker patterns for production robustness.
  • Use Case: Build a customer-support agent that searches knowledge bases, calls external APIs safely, streams partial answers to the UI, and returns validated structured data.

Quick Start

Create a Python agent using LangChain to integrate a weather lookup tool, enable streaming to the client, and produce structured JSON output.

Frequently Asked Questions about langchain

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

FAQPage Schema
How do I build LLM agents that use tools and memory in Python?

To build LLM agents in Python, use a unified interface to compose models, tools, and middleware. This enables multi-step task execution, short-term memory management, and retrieval-augmented generation without manually coding orchestration logic.

Can I stream LLM responses and manage short-term memory for real-time applications?

Yes, you can stream LLM responses to client interfaces for real-time user experiences. Short-term memory management and summarization middleware track conversation context, allowing agents to maintain state across multiple interactions.

Does LangChain support integration with OpenAI, Anthropic, and Google models?

Yes, LangChain supports integration with OpenAI, Anthropic, Google, and Azure providers. It offers configuration and fallback patterns for model integration, allowing developers to connect multiple language models within a single agent workflow.

How do I add human-in-the-loop approvals and error handling to AI agents?

To add human-in-the-loop approvals and error handling, apply middleware to your AI agents. This includes retry and circuit-breaker patterns, logging, and approval gates to ensure production robustness during multi-step tool execution.

What is the best way to implement retrieval-augmented generation pipelines?

The best way to implement retrieval-augmented generation pipelines is by defining deterministic tools and runtime tool registration. This creates knowledge-backed answers by connecting external data sources directly to your language model workflows.

How do I get structured JSON output from an LLM agent?

You can get structured JSON output from an LLM agent by applying structured output schemas. This enforces validated data formats returned by the agent, ensuring reliable integration with downstream systems and APIs.