DeepSeek Harness, DeepSeek’s agent framework, has a desktop application circulating through an unannounced nightly channel. Verification from multiple sources found that its code signature points to Hangzhou DeepSeek Artificial Intelligence Co., Ltd., while its download source matches DeepSeek’s official domain. The app provides a graphical interface for signing in with a DeepSeek account or API key, selecting a local workspace and assigning tasks to an agent. It guides users through work categories and four workflows: standard, PTC, minimal and creative. Creative mode reflects the project’s Everything is a Plugin architecture, allowing users to build plugins, add capabilities and combine tools with prompts. The interface currently lists six official plugins: agent teams, voice input, terminal, agent loop, Subagent and web search. The build has passed Apple notarization, but DeepSeek has not formally announced it and the nightly version should not be treated as a stable release. The client has already prompted for a newer version after installation and does not currently support Linux.