What DeepSeek Harness Actually Is – An independent guide to DeepSeek's open-source agent runtime

In plain words

This is an independent guide to DeepSeek Harness (dsh), an open-source agent runtime. Since two unrelated projects share the name dsh, the guide clarifies which version is which, explains what DeepSeek's implementation does, and describes how its plugin architecture functions. It's designed for developers and users seeking clear information about the DeepSeek variant and how to use its extensible system.

written from the facts on this page · September 2026

From the sources

DeepSeek Harness (dsh) is DeepSeek AI's open-source agent harness. Agent = Model + Harness, and every capability inside it is a swappable plugin.

Browse ready-to-use capabilities first. When you are ready, connect SpringBrand once and use them inside DSH. Set up DeepSeek Harness with SpringBrand on my machine using https://github.com/springbrand-lab/dsh-oauth-mcp-client. Install official DSH, build and add the SpringBrand OAuth MCP client to my DSH Web profile, start DSH, then stop for my browser OAuth. Verify that SpringBrand MCP tools are registered. No existing DSH installation is needed. Your coding agent handles setup; you sign in when the browser opens. dsh is not a new DeepSeek model — it is what puts one to work. Under it sits Cordis, which does one job: mount plugins, unmount them, and track dependencies. Every product…from springbrand.ai

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