---
title: "Discussion on \"How to Build an AI Agent from Scratch in 2025: Architecture & Stack\" | Hashnode"
description: "Discussion on \"How to Build an AI Agent from Scratch in 2025: Architecture & Stack\". A practical engineering guide to building production-ready AI agents in 2025 — covering ReAct, memory design, tool layers, stack decisions, and the failure modes most teams hit after demo day."
url: "https://hashnode.com/posts/how-to-build-an-ai-agent-from-scratch-in-2025-architecture-stack/6a4507591275adf1eb2c3dca"
---

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# [How to Build an AI Agent from Scratch in 2025: Architecture & Stack](https://microcosmworks.hashnode.dev/how-to-build-an-ai-agent-from-scratch-in-2025-architecture-stack?utm_source=hashnode&utm_medium=feed)

A practical engineering guide to building production-ready AI agents in 2025 — covering ReAct, memory design, tool layers, stack decisions, and the failure modes most teams hit after demo day.

Jul 1 · 6 min read · microcosmworks.hashnode.dev  
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## Written by

[Ujjwal Tripathi](https://hashnode.com/@ujjwalt)

@ujjwalt · Delhi, India

  
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