Full Stack Agentic AI Coding Assistant from Scratch (LangChain, TypeScript, Node.js) in 2026

Build your own Agentic AI Coding Assistant from scratch using LangChain and TypeScript in this step-by-step 2026 tutorial. In this video, you’ll learn how to design and implement an autonomous AI coding assistant that can plan tasks, write code, debug errors, and interact with tools—just like advanced AI systems used today. This is not just a basic demo. You’ll understand how agentic AI systems actually work under the hood, including memory, reasoning, and tool integration. What you’ll learn: What an Agentic AI system is How AI coding assistants work Setting up LangChain with TypeScript Building an AI agent from scratch Adding memory and tool usage Automating coding workflows Structuring real-world AI projects Tech Stack: LangChain TypeScript LLM APIs Vector databases (optional) Who this is for: Developers who want to build AI tools Anyone interested in AI agents Programmers looking to automate coding tasks By the end, you’ll have your own AI coding assistant you can expand and customize. 🔗 FOLLOW ME ON ------------------------------------------------ 💻 GitHub: www.github.com/sylvaincodes 🔴 Patreon www.patreon.com/sylvaincodes ⏱️ Timestamps --------------------------- 00:00:00 - What is Agentic AI? 00:00:43 - How Agentic Systems Work 00:02:36 - Why Build This in 2026? 00:04:03 - The 3 Pillars of Agentic Systems 00:05:16 - The Brain: Designing the Agent 00:35:43 - The Tools: Giving Your Agent Capabilities 03:12:50 - Connecting Tools to the Agent 03:46:34 - The Memory: Context & State Management 06:24:30 - Testing the Agent 06:34:25 - Full Project & Source Code 🔗 MUSIC ------------------------------- MySelft ⚠️ DISCLAIMER The disclaimer video is intended for educational purposes only. Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, reporting current affairs, teaching, scholarship and research. Fair use is permitted by copyright law that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use. #agenticai #javascript #langchain #typescript #aiengineering