Deepseek Harness
DeepSeek Harness is an open-source agent app for documents, spreadsheets, code and scheduled tasks, built for office users and plugin developers.
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Pricing and API checked by an OpenBeat editor on Nov 9, 2026 · facts from the maker’s own site ·
Tool insights
DeepSeek Harness lets you hand routine document, spreadsheet and coding work to an agent that runs on your desktop or in a browser. You can add tools and skills through plugins, including ones you create by talking to the agent.
Daily file work and repeat tasks often need several separate tools and manual follow-up. DeepSeek Harness puts file handling, web search, background runs and scheduling in one agent you can extend.
Worth a look for people who do regular document and spreadsheet work, and for developers who want to write code or build plugins. Not a fit if you need a stable, finished product today, since it is a preview.
What it does
DeepSeek Harness is an agent app from DeepSeek. It works with documents, spreadsheets, code and HTML files. It can also search the web and run tasks on a schedule. You can use it as a desktop app or as a web interface started from the command line.
The main use case is daily file work: drafting and editing documents, handling spreadsheets and writing code, with the agent doing tasks in the background while you do other things.
Key features
- Plugins: tools, skills and the interface itself are built from plugins.
- Plugin creation by chat: a conversation mode helps you make new plugins.
- Scheduled tasks: tasks can repeat weekly.
- Background runs: tasks keep running, and a progress view shows where they stand.
- File handling: documents, spreadsheets, code and HTML files.
- Web search: results come with cited sources.
- Developer view: shows run traces and tool calls, which helps when debugging an agent or a plugin.
The model listed in the facts is DeepSeek-V41-Flash.
Pricing
As of November 2026, DeepSeek Harness is open source under the MIT license, and the pricing model is listed as open-source. No paid plans, starting price or free plan are stated on the maker's site. Whether using the model behind it costs anything is also not stated.
API and integrations
An API for Harness itself is not stated on the maker's site, and no SDKs are listed. No third-party integrations are named. Extension happens through the plugin system.
Supported platforms:
- macOS (Apple chip)
- Windows (64-bit)
- Web, started with npx
The code is on GitHub at deepseek-ai/deepseek-harness. The repository is not archived and was last pushed on 4 November 2026. No tagged release is listed.
Good to know
- It is a preview version.
- Core plugins and the base API will keep changing, so plugins you write may need updates.
- No docs, pricing or changelog links are provided in the facts.
- Intel Macs, Linux and 32-bit Windows are not listed as supported.
FAQ
Is DeepSeek Harness free and open source?
DeepSeek Harness is open source under the MIT license, as of November 2026. The maker's site does not state any paid plans or a separate free plan, so costs of the underlying model are unclear.
What platforms does DeepSeek Harness run on?
It runs on macOS with an Apple chip and on 64-bit Windows as a desktop app. It also runs as a web interface that you start with npx.
What can DeepSeek Harness do?
It handles documents, spreadsheets, code and HTML files, searches the web with cited sources, and runs tasks in the background. It can also schedule tasks on a weekly repeat.
Can I build plugins for DeepSeek Harness?
Yes. The app is built on plugins, and a conversation mode helps you create new ones. The maker warns that core plugins and the base API will keep changing in this preview.
Does DeepSeek Harness have an API or SDKs?
An API and SDKs are not stated on the maker's site. Extension is described through plugins, and the source code is on GitHub.
Releases
No tracked releases yet.
In the news
No coverage yet.