---
title: "Discussion on \"# I designed an AI agent without writing a line of code — and the first eval caught two dangerous mistakes\" | Hashnode"
description: "Discussion on \"# I designed an AI agent without writing a line of code — and the first eval caught two dangerous mistakes\". I designed and tested an AI email agent without a line of code. Why eval and context engineering — not code — separate a working agent from a demo."
url: "https://hashnode.com/posts/i-designed-an-ai-agent-without-writing-a-line-of-code-and-the-first-eval-caught-two-dangerous-mistakes/6a23fd525926517c61383e35"
---

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# [\# I designed an AI agent without writing a line of code — and the first eval caught two dangerous mistakes](https://agentloop.hashnode.dev/i-designed-an-ai-agent-without-writing-a-line-of-code-and-the-first-eval-caught-two-dangerous-mistakes?utm_source=hashnode&utm_medium=feed)

I designed and tested an AI email agent without a line of code. Why eval and context engineering — not code — separate a working agent from a demo.

Jun 6 · 3 min read · agentloop.hashnode.dev  
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-   [#ai-agent](https://hashnode.com/tag/ai-agent)
-   [#agent](https://hashnode.com/tag/agent)
-   [#agentic-workflow](https://hashnode.com/tag/agentic-workflow)
-   [#eval](https://hashnode.com/tag/eval)
-   [#context-engineering](https://hashnode.com/tag/context-engineering)

## Written by

[Denis Krinitsyn](https://hashnode.com/@landlord1987)

@landlord1987 · Zlatoust, Russia

  
[View profile](https://hashnode.com/@landlord1987)

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