DeepSeek Creator Mode Lets Harness Users Build Plugins by Chat

DeepSeek has launched DeepSeek Creator Mode, a new setting in its open-source DeepSeek Harness agent app that builds working plugins from plain-language requests. The Hangzhou-based AI company announced the feature on November 2, showing plugins such as a design workspace, a sandbox game and a 3D visualizer for large language models.

According to Bloomberg, DeepSeek also demonstrated a 3D model renderer and a video editing workbench, both created from prompts typed in everyday English. The Harness code, including Creator Mode, is published under the MIT license.

Your Harness. You Define It.

Meet Creator Mode in DeepSeek Harness.

Turn ideas into plugins that you can use, from a design workspace to a sandbox game or a 3D LLM visualizer.

What will you create?

— DeepSeek Harness (@DeepSeekHarness) November 2, 2026

What DeepSeek Creator Mode does

DeepSeek Harness is built on an “everything is a plugin” design, so tools, skills and even parts of the interface can be added or swapped. Creator Mode lets the agent write those plugins itself. On its official Harness page, DeepSeek shows the agent building, installing and verifying a floating Pomodoro timer plugin in about five and a half minutes after a one-line request.

Harness itself is in public preview worldwide. It runs as a desktop app for Apple silicon Macs and 64-bit Windows, or as a local web interface started with a single npx command after installing Node.js. Developers can also clone the full source from GitHub, where the project has passed 269,000 stars since the repository was created in August.

Why it matters for AI agent users

The launch pushes DeepSeek further into the agent market only days after it showed off its Super-agent coding prototype. Instead of waiting for official integrations, users can describe the tool they want and let the agent assemble it inside the app.

Rivals are setting their own limits on what agents should build. Anthropic, for example, recently confirmed new Claude Code rules on recreating existing games, citing intellectual property concerns.

Security caveats

Plugins are code, and DeepSeek is clear that Harness is experimental. Its safety notice on GitHub says the software has not had a security audit, can run model-generated code and commands, and may damage files or leak credentials if a plugin or prompt goes wrong.

The company recommends running it with the least privileges possible, ideally in a disposable virtual machine or container, keeping backups and reviewing plugins before allowing them to run. That advice is worth taking seriously after recent incidents such as a malicious coding extension that planted an SSH backdoor.

DeepSeek also warns that Harness is a developer preview with compatibility-breaking changes ahead, so plugins built today may need rework as the platform matures.