DeepSeek Harness

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Open-source agent harness from DeepSeek AI built on an "everything is a plugin" architecture powered by Cordis.

Author deepseek-ai Open Sourced 2026-08-13 Last Commit Unknown

Overview

DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI. It adopts an architecture where everything is a plugin, built on top of the Cordis framework whose design is described in "A Programming Paradigm for Spatiotemporal Composability". The harness ships with a Web UI and is currently in developer preview with rapid iteration.

Key Features

"Everything is a plugin" architecture for maximal extensibility.
Built on Cordis, a framework for spatiotemporal composability.
Web UI launched via npx @deepseek-ai/dsh web with no complex setup.
Plugin discoverability through the dsh-plugin GitHub topic ecosystem.

Use Cases

Run a local agent harness with a built-in Web UI.
Extend agent capabilities by installing or authoring plugins.
Build composable agent applications on a plugin-based runtime.

Technical Details

22,600+ GitHub stars.
MIT licensed; developed by DeepSeek AI.
Node.js-based, installable from npm as @deepseek-ai/dsh.
Developer preview status — compatibility-breaking changes expected.