---
title: "Denis Krinitsyn (@landlord1987) | Hashnode"
description: "Denis Krinitsyn (@landlord1987) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@landlord1987"
---

@landlord1987

# Denis Krinitsyn

@landlord1987 · Zlatoust, Russia · Joined June 2026

### [\# 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.

3 min read · [agentloop.hashnode.dev](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)

[Jun 6](https://hashnode.com/posts/i-designed-an-ai-agent-without-writing-a-line-of-code-and-the-first-eval-caught-two-dangerous-mistakes/6a23fd525926517c61383e35)