# DeepSeek Harness review

> DeepSeek Harness (dsh) is an open-source agent harness from DeepSeek AI, built on an everything-is-a-plugin architecture powered by Cordis.

Devtoolwatch Board, the week of Oct 25–31, 2026. Canonical page: https://index.devtoolwatch.com/tools/deepseek-ai-deepseek-harness/

## TL;DR

DeepSeek Harness is an open-source agent harness from DeepSeek AI that runs as a desktop app or a local Web UI. It handles documents, spreadsheets, code and scheduled tasks. Developers who want to extend an agent with plugins will find its main difference: everything is a plugin, and plugins can be created through conversation.

## DeepSeek Harness at a glance

- **Category:** [Coding agents](https://index.devtoolwatch.com/categories/coding-agents/)
- **Maintained by:** DeepSeek (organization, [@deepseek-ai](https://github.com/deepseek-ai) on GitHub)
- **License:** MIT
- **Language:** TypeScript, CSS, Python
- **Repository:** [github.com/deepseek-ai/deepseek-harness](https://github.com/deepseek-ai/deepseek-harness)
- **Website:** [deepseek.com/harness](https://deepseek.com/harness)
- **Latest release:** [dsh-v0.2.1-rc.5](https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.2.1-rc.5) on GitHub, Oct 30, 2026
- **First published:** Aug 13, 2026

## What DeepSeek Harness does

- DeepSeek Harness writes code and edits repositories: understanding projects, fixing issues, developing features and running tests.
- DeepSeek Harness organizes documents, analyzes spreadsheets and previews task results such as Word, Excel, HTML and PDF files.
- DeepSeek Harness schedules recurring tasks, such as generating a weekly report every Friday at a set time.
- DeepSeek Harness lets you install plugins or create them by chatting with the agent in Creation Mode.
- DeepSeek Harness can discover and install plugins from custom plugin index sources and update third-party plugin packages.
- DeepSeek Harness provides developer tools for viewing execution traces, tool calls and timing details for each turn and step.
- DeepSeek Harness supports DeepSeek Search and Fetch APIs, which you enable in Web Search settings.

### How it works

DeepSeek Harness runs as a desktop app or as a local Web UI started with npx, served at http://127.0.0.1:3080 by default. Its capabilities come from Cordis-based plugins, including official bundles for Claude Code and Codex. It connects to DeepSeek models through account sign-in or a DeepSeek API key adapter. It also supports headless, SDK and ACP profiles.

## How to install DeepSeek Harness

**With npx**

```
npx @deepseek-ai/dsh web
```

### Requirements

- Node.js for running from npm; pnpm for running from source.
- Desktop app downloads are offered for macOS (Apple silicon) and Windows (64-bit).

### First steps

1. Read the project's safety notice (SAFETY.md) before running DeepSeek Harness.
2. Install Node.js, then run the npx command to start the Web UI at http://127.0.0.1:3080.
3. Pass --no-open to run the server without opening a browser, for example on a remote machine.
4. Open the plugin management page to install official plugins or ask the agent to create one.

## Who DeepSeek Harness is for

- Developers who want an agent they can extend or reshape through plugins.
- Users of DeepSeek models who want a coding and general-task agent with a Web UI or desktop app.
- Plugin authors building on the Cordis framework.

### Limitations

- DeepSeek Harness is in developer preview, and the README warns there will be compatibility-breaking changes.
- DeepSeek Harness releases are currently pre-release versions, such as v0.2.1-rc.5.
- Several DeepSeek Harness plugins, including subagents and automation tasks, are labeled experimental.
- The DeepSeek Harness desktop app is offered only for macOS on Apple silicon and 64-bit Windows.

## Usage data (the week of Oct 25–31, 2026)

- Board rank: #18 overall, #9 in Coding agents, momentum score 91
- New GitHub stars per week (last 12 weeks): Aug 9: 118.5k; Aug 16: 64.9k; Aug 23: 18k; Aug 30: 9.8k; Sep 6: 8.7k; Sep 13: 8.8k; Sep 20: 6.8k; Sep 27: 6.2k; Oct 4: 4.6k; Oct 11: 5.6k; Oct 18: 8.5k; Oct 25: 7.3k

## DeepSeek Harness alternatives

| Rank | Tool | Stars | Downloads/wk |
|---|---|---|---|
| #1 | [Cindy](https://index.devtoolwatch.com/tools/makecindy-cindy/) | 8.8k | – |
| #2 | [OpenMausBot](https://index.devtoolwatch.com/tools/milind-soni-openmausbot/) | 9.6k | – |
| #3 | [Orca](https://index.devtoolwatch.com/tools/stablyai-orca/) | 111.7k | – |
| #4 | [OpenBot](https://index.devtoolwatch.com/tools/copilotkit-openbot/) | 9.1k | – |
| #5 | [Agent Reach](https://index.devtoolwatch.com/tools/panniantong-agent-reach/) | 107.2k | – |
| #6 | [Skill Recorder](https://index.devtoolwatch.com/tools/microsoft-skill-recorder/) | 5.6k | – |

## DeepSeek Harness FAQ

### Is DeepSeek Harness free and open source?

Yes. DeepSeek Harness's source code is on GitHub (deepseek-ai/deepseek-harness) under the MIT license, so you can use it for free.

### How do I install DeepSeek Harness?

Run `npx @deepseek-ai/dsh web`. The install section above has the other options from the project's README.

### Is DeepSeek Harness still maintained?

Yes. The deepseek-ai/deepseek-harness repository was last updated on Oct 30, 2026, and the latest release, dsh-v0.2.1-rc.5 on GitHub, came out on Oct 30, 2026.

### How popular is DeepSeek Harness?

DeepSeek Harness has 267.4k GitHub stars as of Nov 1, 2026. It gained 7.3k new stars in the week of Oct 25–31, 2026, against a 12-week average of 22.3k a week. That made it #9 among AI coding agents on the Devtoolwatch Board.

### DeepSeek Harness vs OpenCode: how do they compare?

DeepSeek Harness and OpenCode are both tracked by Devtoolwatch as AI coding agents. DeepSeek Harness has 267.4k GitHub stars and OpenCode has 223.6k. OpenCode is an open source AI coding agent that helps you write and run code in a terminal, desktop app, or IDE extension. [OpenCode review](https://index.devtoolwatch.com/tools/opencode/)

### DeepSeek Harness vs Claude Code: how do they compare?

DeepSeek Harness and Claude Code are both tracked by Devtoolwatch as AI coding agents. DeepSeek Harness has 267.4k GitHub stars and Claude Code has 154.1k. Claude Code is Anthropic's agentic coding tool that reads your codebase, edits files, runs commands, and handles git workflows through natural language. [Claude Code review](https://index.devtoolwatch.com/tools/claude-code/)

### What are the best alternatives to DeepSeek Harness?

Other AI coding agents on the Devtoolwatch Board in the week of Oct 25–31, 2026, by momentum: Cindy (#1), OpenMausBot (#2), Orca (#3), OpenBot (#4), Agent Reach (#5). The alternatives table above has their numbers.

### Is DeepSeek Harness a coding agent?

Yes. DeepSeek Harness can understand projects, fix issues, develop features and run tests. It also handles documents, spreadsheets, research and scheduled tasks.

### Is DeepSeek Harness open source?

Yes. DeepSeek AI describes DeepSeek Harness as an open-source agent harness, and the repository is public on GitHub.

### Does DeepSeek Harness have a desktop app?

Yes. DeepSeek Harness offers desktop downloads for macOS (Apple silicon) and Windows (64-bit). It can also run as a Web UI in the browser.

### Does DeepSeek Harness have a CLI?

Yes. DeepSeek Harness has a dsh command that launches the Web UI with `npx @deepseek-ai/dsh web`. The project also mentions headless, SDK and ACP profiles.

### Is DeepSeek Harness safe to run?

DeepSeek Harness is a developer preview. The README asks users to review the project's safety notice before running it. Its experimental auto-approval review plugin is listed separately.

### Can DeepSeek Harness work with Claude Code or Codex?

Yes. DeepSeek Harness offers official Claude Code and Codex bundles. An experimental subagent_oar plugin hands independent tasks to a local Codex or Claude CLI.

## Sources

1. [deepseek-ai/deepseek-harness on GitHub](https://github.com/deepseek-ai/deepseek-harness)
2. [DeepSeek Harness README](https://github.com/deepseek-ai/deepseek-harness/blob/master/README.md)
3. [DeepSeek Harness website](https://deepseek.com/harness)
4. [Release dsh-v0.2.1-rc.5 (Oct 30, 2026)](https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.2.1-rc.5)
5. [Release dsh-v0.2.2-alpha.2 (Oct 28, 2026)](https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.2.2-alpha.2)
6. [Release dsh-v0.2.1-rc.4 (Oct 28, 2026)](https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.2.1-rc.4)
7. [Hacker News: DeepSeek v4](https://news.ycombinator.com/item?id=47884971)
8. [Hacker News: DeepSeek-v3.1](https://news.ycombinator.com/item?id=44976764)
9. [Hacker News: DeepSeek Harness developer preview](https://news.ycombinator.com/item?id=49285244)
10. [Devtoolwatch Board, the week of Oct 25–31, 2026](https://index.devtoolwatch.com/)