DeepSeek Harness, DeepSeek's open-source, MIT-licensed agent app, announced Creator Mode on its official X account on November 2: users describe the plugin they want in plain language, and the agent turns it into a plugin they can use. Demos include a 3D landmark gallery, a 3D Transformer visualizer, a video editing workbench and a paper reader. DeepSeek also published seven bilingual demo prompts on cdn.deepseek.com, cautioning that some plugins took several rounds of conversation, so a single prompt may not reproduce the video exactly. The post drew about 20,000 likes and 1.69 million views. No benchmarks were published.
Key Takeaways
- ✓Creator Mode: describe the plugin you want in natural language and the agent turns it into a usable plugin, from a design workspace to a sandbox game or a 3D LLM visualizer.
- ✓DeepSeek published 7 demo prompts: a 3D landmark gallery, a 3D Transformer demo, a five-style app theme switcher, a poster workbench, a video editor, a paper reader and a token-usage statistics plugin.
- ✓The entry point shipped in v0.2.1-rc.5 (Oct 30 pre-release): plugin management gained a "Let Agent create a plugin" button that opens Creator mode and keeps the draft.
- ✓The GitHub repo has about 270,000 stars under the MIT license; Harness is still in preview.
- ✓No benchmarks or success rates were published; the announcement drew about 20,000 likes and 1.69 million views.
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Background and Industry Pain Points
Agent tools such as Claude Code and Codex keep adding features, but when users want one more button or panel they usually have to wait for an update or learn a plugin API. DeepSeek Harness, DeepSeek's open-source agent app (MIT license, about 270,000 GitHub stars), is built on the idea that everything is a plugin. On November 2 its official X account announced Creator Mode, which hands customizing the tool itself to the agent. The post drew about 20,000 likes and 1.69 million views.
Architecture Highlights and Underlying Mechanism
Harness runs on the Cordis framework, and its features are organized as plugins that can live in the left sidebar, the right sidebar or the conversation. In Creator Mode the user describes the need in a sentence and the agent builds the matching plugin. Creator mode first appeared in the October v0.2 release, so this is the official launch and promotion rather than a brand-new feature. The October 30 v0.2.1-rc.5 pre-release also added a "Let Agent create a plugin" entry to plugin management, which opens Creator mode with the draft preserved, plus support for custom plugin index sources.
Benchmarks and Measured Results
DeepSeek published no benchmarks, success rates or cost figures. Its prompt page warns that some demo plugins were refined over several rounds of conversation, so one prompt may not reproduce the video. Individual users have shared their own tests, but those are unverified and are not cited as data here.
Developer Playbook and Getting Started
With Node.js installed, you can start the web UI with npx. Open DeepSeek's page of seven demo prompts, copy one (for example the paper reader or the token-usage statistics plugin), choose Creator Mode in Harness and send it. Harness is still a preview, so try generated plugins in a test workspace first and read any permission prompt before installing.
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