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⚡ The Free Open-Source AI Coding Agent You Can Fully Control (Even Better Than Claude Code)

Imagine having an AI coding agent where you decide how it works, what models it uses, and how it fits into your workflow. Like, every single thing, isn't it better, much better?

Author

Neil Phan
August 28, 2026

TL;DR

DeepSeek Harness helps you turn DeepSeek into a more flexible AI coding agent. Instead of only asking questions, you can build workflows that help AI handle coding tasks in a way that matches your process.

DeepSeek Harness separates the AI model from the environment where the agent works. This gives developers more control over how they use models, tools, and workflows.

This guide covers the setup process, how to use DeepSeek Harness for coding tasks, and how to customize it with your own tools and workflows.

Key points

  • DeepSeek Harness gives developers more control over their AI coding environment.

  • You can customize workflows, tools, and instructions for different development needs.

  • DeepSeek Harness is useful for developers who want more flexibility than a standard coding assistant.

Introduction

“Is there a free version of Claude Code that I can fully control?”

For sure. A big YES. Meet DeepSeek Harness (dsh), DeepSeek's own open-source agent framework. And people went crazy over it.

It went viral almost immediately: 95,000+ GitHub stars in its first 2 days, then passed 187,000 within 10 days. But why?

Because everything is a plugin. The model. The tools. The agent loop. Even the UI. You can swap any part you want without touching the source code.

And you can even call Claude Code and Codex as sub-agents inside your own workflow.

So today, I'll show you what DeepSeek Harness actually unlocks, and exactly how to use it, starting from $0.

Just follow along. I'll show you its magic, and how to use it yourself.

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