DeepSeek Harness Plugin Development Guide Explains 'Everything Is a Plugin' Architecture

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A developer tutorial published on DEV Community walks through building plugins for DeepSeek Harness (dsh), an open-source AI tooling framework driven by a vendored version of Cordis. The guide explains that dsh has no privileged core — model adapters, tool registries, session logs, and the agent main loop are all plugins, making every component replaceable via configuration. Developers are shown how to export the four standard plugin fields (name, inject, Config, and apply) and how to register tools and event hooks in a reversible, hot-reload-safe manner. The tutorial covers setting up a local clone of the GitHub repository, running type checks and unit tests without an API key, and eventually packaging a plugin for formal release. It also details the layered loading order dsh uses to compose its runtime plugin tree from profiles, patch files, and command-line overrides.

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