What is DeepSeek Harness?
DeepSeek Harness expands Agent capabilities through composable plugins, offering both a desktop application and a web interface that can be launched via code. Officially positioned as a preview version open for global testing, it is built on Cordis’s plugin architecture and organizes its features around office tasks, coding workflows, and customizable working styles.
Daily tasks can be used to organize data, analyze spreadsheets, write documents, and prepare presentations; development tasks include understanding the project, modifying repositories, implementing features, and running tests. Users can preview task outcomes, refine them through conversation, and use automation task plugins to schedule recurring work; execution traces and detailed tool call information help monitor the process.
Developers can use existing plugins, or extend tools, capabilities, and interfaces by creating custom plugins in creative mode or writing them from scratch. The core plugins and foundational APIs of the preview version will continue to evolve; before deployment, be sure to verify the latest documentation, dependencies, and model configurations. When modifying files, scripts, or scheduling tasks, restrict access to specific workspaces and permissions, and compare actual outputs with test results.
Key features
Plugin architecture: Combine existing plugins, or create your own tools, skills, and interfaces.
Office tasks: organizing documents, analyzing spreadsheets, and preparing reports.
Development tasks: understanding the project, modifying the code, and running tests.
Execution Management: View results, automate tasks, and track execution history.
Use cases and audience
Users and developers who need a scalable Agent workspace to handle office or coding tasks.
- Organize documents and spreadsheets and prepare the presentation.
- Understand projects and fix issues within the specified repository.
- Configure plugins and scheduled workflows for repetitive tasks.
Task descriptions, workspace files, code repositories, and data supported by enabled plugins.
Documentation, analytics, code changes, and plugin task results, as well as execution traces.
How to use
- 01
Choose the desktop version from the official website, or launch the web interface according to the official documentation.
- 02
Configure the model, workspace, and required plugins according to the task.
- 03
Describe the target and the range of files that can be modified.
- 04
Adopt after reviewing the preview results, tool trajectories, and test outcomes.
Benefits and limitations
Benefits
- The open-source plugin architecture is composable and extensible.
- Result previews and execution traces facilitate review.
Limitations
- The preview version of the API and plugins may still change.
- Deployment, model serving, and tool permissions must be configured separately.
Official website & sources
Updated on 2026-10-24
