Show HN: Building a Real Agent, Step-by-Step

Category: library

Tags: agentic-loop, tutorial, llm-tools

Score: 5.8/10 (Innovation: 4, Technical: 6, Documentation: 7, Utility: 6)

This project provides a step-by-step educational guide to building an agentic loop from scratch in JavaScript, using no frameworks and minimal dependencies, then extending it with tool execution, SQLite persistence, and MCP integration. It's interesting because it demystifies the concept of 'agents' by showing exactly how a chat completion turns into a loop that can call tools and resume sessions, making it a practical learning resource for developers.

Target audience: backend devs

Repository: https://building-an-agent.pagey.site/ · JavaScript

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