DeepSeek Harness

DeepSeek Harness is an open-source, plugin-based framework for building agents. It is aimed at Harness developers and is available as a developer preview for global testing.

Agent capabilities including models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and UI are provided by plugins that can be replaced or recombined through configuration. It is built on the Cordis plugin system, which manages plugin loading, unloading, and dependencies.

The project includes a Web UI that can be started with npx @deepseek-ai/dsh web, as well as source installation from GitHub. It supports standard, PTC, minimal, and creative operating modes, with append-only session logs for tracing, recovery, branching, search, and replay.

Highlights

• Open-source developer preview for Harness developers
• Plugin-based architecture for agent capabilities
• Standard, PTC, minimal, and creative running modes
• Trajectory views and append-only session logs
• Web UI available through an npx command