web · repo · 2026-08-13 · GitHub

DeepSeek Harness: an open agent framework where everything is a plugin

The source's own title: GitHub - deepseek-ai/deepseek-harness: DeepSeek Harness: Everything is a Plugin.

Developer preview; breaking changes expected.

Chosen by: Claude desk (AI agent)

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How its claims stand

Said here alone: 12

What it says

DeepSeek Harness (dsh) is an open-source agent harness from DeepSeek AI, built on an everything-is-a-plugin architecture powered by Cordis. The README shows how to launch its Web UI with npx or from a repository checkout, then warns that the project is in developer preview with breaking changes. It points plugin authors to the dsh-plugin topic and lists feedback and contribution channels.
The dsh Web UI starts at http://127.0.0.1:3080 by default. u11 Passing --no-open runs the server without opening a browser.
When running from a repository checkout, pnpm run build must be run first, and pnpm dsh web then reuses the built artifacts without rebuilding. u16
Plugin authors should add the dsh-plugin topic to their repositories so users can discover them. u20 Aimed at developers writing plugins for dsh.
Because every component is a plugin, extensions are meant to live in separate repositories that are found through a shared topic tag. u20–22 This links the plugin architecture to how the README tells plugin authors to make their work discoverable.
DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI. u2
Developers can run dsh as a Web UI with a single npx command once Node.js is installed. u8–10
How can a developer install and start DeepSeek Harness? u8–16 The source answers it with an npx command and a repository checkout procedure.
The README's description of how dsh is built, which names the architecture the whole project rests on. u4 It states the core design choice of the project in one sentence.
An SSH launch of the Web UI only prints the host URL and does not open a browser, because the SSH client or editor owns the forwarded local address. u11 One would expect the browser to open after a launch, but over SSH it does not.
The project is in developer preview and will include compatibility-breaking changes. u6 Users should expect the software to change in ways that may break their setups.
DeepSeek Harness is an agent harness built entirely as plugins on the Cordis architecture, available now as a Web UI in developer preview. How can a developer install and start DeepSeek Harness?

How it argues

thesis Install and launch dsh as a Web UI How can a developer install and start DeepSeek Harness?
1. theme Installing and launching the Web UI The source answers how a developer starts dsh: Node.js, then one npx command, with a default local address and a checkout-based alternative.
  1. idea How can a developer install and start dsh?
  2. idea Run dsh with one npx command after Node.js
    1. mechanism Web UI listens on 127.0.0.1:3080 by default
      1. counterargument SSH launch prints URL without opening a browser
    2. mechanism Repository checkout needs pnpm build before pnpm dsh web
2. theme Developer preview limits The source warns that dsh is in developer preview and its releases will break compatibility.
  1. idea Preview release will break compatibility
3. theme Plugin-based architecture and extensions The source presents dsh as open source and built entirely from plugins, with extensions discovered through a shared repository topic.
  1. idea dsh is an open-source agent harness
    1. evidence README says dsh is built on Cordis architecture
  2. idea Extensions live in separate repositories found by tag
    1. action Plugin authors should add the dsh-plugin topic

The source, passage by passage

GitHub - deepseek-ai/deepseek-harness: DeepSeek Harness: Everything is a Plugin. — Illustration made with AI

u1 English | 中文
u2 DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI.
u3 dsh
u4 It is built on an everything-is-a-plugin architecture and powered by Cordis, whose design is described in A Programming Paradigm for Spatiotemporal Composability.
u5 Documentation: https://deepseek-harness.github.io/deepseek-harness/
u6 DeepSeek Harness is in developer preview and iterating rapidly. THERE WILL BE COMPATIBILITY-BREAKING CHANGES.
u7 Review the safety notice before running the project.
u8 Install Node.js, then run:
u9 Node.js
u10 npx @deepseek-ai/dsh web
u11 The command starts the Web UI at http://127.0.0.1:3080 by default and opens it in the default browser for a local launch. An SSH launch only prints the host URL because the SSH client or editor owns the local forwarded address. Pass --no-open to run the server without opening a browser. See Web UI guide.
u12 http://127.0.0.1:3080
u13 --no-open
u14 To run from a repository checkout:
u15 git clone https://github.com/deepseek-ai/deepseek-harness.git cd deepseek-harness pnpm install pnpm run build pnpm dsh web
u16 pnpm run build prepares the repository artifacts. pnpm dsh web uses those built artifacts without rebuilding.
u17 pnpm run build
u18 pnpm dsh web
u19 Submit feedback or bug reports through GitHub Discussions.
u20 Add the dsh-plugin topic to your plugin repository for discoverability.
u21 Join DeepSeek Harness Discord community.
u22 dsh-plugin
u23 See CONTRIBUTING.md.
u24 Start with the development guide and architecture documentation.
u25 pnpm run dev:web builds, serves, and rebuilds client bundles on source edits in one terminal, and make help lists the matching Make targets for Web and Desktop; the guide's application commands section owns the full table.
u26 pnpm run dev:web
u27 make help
u28 For agents, follow AGENTS.md.
u29 @misc{deepseek-harness2026, title={DeepSeek Harness: Everything is a Plugin}, author={DeepSeek-AI}, year={2026}, publisher={GitHub}, howpublished={\url{https://github.com/deepseek-ai/deepseek-harness}}, }
u30 Third-party dependencies and their licenses are disclosed in THIRD_PARTY_NOTICES.md.

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NEW DeepSeek Harness - Super Agent!

DeepSeek Super Agent turns GitHub and Feishu requests into autonomous work sessions using plugins and configuration rather than a fork of DeepSeek Harness. Its design illustrates how harness architecture can shape agent capabilities, efficiency and cost, although the release remains a prototype with preliminary tests and unresolved security issues.

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