DeepSeek added Creator Mode to DeepSeek Harness, letting users build and install plugins through chat inside its open-source agent environment.
The DeepSeek Harness page shows the full loop: Creator Mode builds a Pomodoro timer, installs it through the plugin manager, then checks its live state. Harness is available in public preview worldwide.
Creator Mode is an agent preset rather than a separate model or app. The Harness documentation says it adds runtime inspection, plugin management, and authoring guidance.
For builders, natural-language plugin creation lowers the barrier to extending tools, skills, and interfaces. It also makes review more important: generated plugins should be tested and their access checked before they touch production workflows or credentials.