DeepSeek has released DeepSeek Harness, an open-source agent harness currently in public preview worldwide. Built on the "everything is a plugin" architecture powered by Cordis, the tool allows users to extend the capabilities of agents through composable plugins.
Product LaunchesDeepSeekDeepSeek Harness
DeepSeek Releases Open-Source "DeepSeek Harness" Agent Harness in Public Preview
DeepSeek Harness can be run as a desktop application for macOS and Windows or launched via a web UI. The platform provides various built-in functionalities, including document organization, spreadsheet analysis, and code writing. Users can interact with the results directly through conversation to refine tasks.
The harness includes features such as a plugin creator mode via chat, which allows for the development of new tools, skills, and interface elements. It also supports scheduled tasks, enabling users to run recurring work on a set schedule. Developers can inspect execution traces and detailed runtime information to troubleshoot tool calls and task execution.
DeepSeek Harness is currently in developer preview and is undergoing rapid iteration, meaning users should expect breaking changes. The project is released under the MIT license.
Sources
- DeepSeek Harness Desktop for macOS and Windows （Hacker News Frontpage, 2026-10-02）
- GitHub