name: langchain-agent description: AI agent with tools (search, calculator) using LangGraph and AI SDK.

LangChain Agent

An AI agent with tools (search engine and calculator) powered by LangGraph and the Vercel AI SDK.

Tech Stack

• Framework: Next.js
• AI: LangChain.js, LangGraph, AI SDK
• Database: PostgreSQL
• Package Manager: pnpm

Prerequisites

• PostgreSQL database
• OpenAI API key

Setup

1. Clone the Template

git clone --depth 1 https://github.com/Eng0AI/langchain-agent.git .

If the directory is not empty:

git clone --depth 1 https://github.com/Eng0AI/langchain-agent.git _temp_template
mv _temp_template/* _temp_template/.* . 2>/dev/null || true
rm -rf _temp_template

2. Remove Git History (Optional)

rm -rf .git
git init

3. Install Dependencies

pnpm install

4. Setup Environment Variables

Create .env with required variables:

• POSTGRES_URL - PostgreSQL connection string
• OPENAI_API_KEY - OpenAI API key for the agent

Build

pnpm build

Development

pnpm dev