# DeepSeek Harness

DeepSeek's open-source coding agent, built as an everything-is-a-plugin harness with a local web UI.

HTML: https://softbests.com/software/deepseek-harness
Markdown: https://softbests.com/software/deepseek-harness.md
Website: https://deepseek.com/harness

- Category: [Coding agents](https://softbests.com/category/coding-agents)
- Pricing: Open source
- Platforms: CLI, Web, macOS, Windows, Linux, Self-hosted

## Best for

Developers who want a hackable agent harness that can be extended, embedded, and run locally.

## Why it deserves attention

DeepSeek Harness (dsh) is DeepSeek AI's official agent harness: run `npx @deepseek-ai/dsh web` and you get a local web UI at 127.0.0.1:3080 where the agent reads and edits files, runs commands, plans tasks, and delegates work. Everything is a plugin on top of Cordis, so models, tools, skills, and interfaces can be replaced without forking the core. It is MIT licensed, has roughly 270,000 GitHub stars, and is under very active development. It is explicitly a developer preview with breaking changes, so pin versions for anything you depend on and review the safety notice before giving it filesystem access.

## Can replace

- [GitHub Copilot](https://softbests.com/software/github-copilot)
- [Windsurf](https://softbests.com/software/windsurf)

## Related and alternatives

- [Claude Code](https://softbests.com/software/claude-code)
- [Codex CLI](https://softbests.com/software/codex-cli)