# DeepSeek Harness English | [中文](README.zh.md) The **DeepSeek Harness SDK** is a plugin-based SDK for building agent harnesses. ## Development This monorepo is built on the [Cordis](https://github.com/cordiverse/cordis) framework (vendored as source under `vendor/`), microkernel-style: everything is a plugin. ```sh pnpm install pnpm run test # vitest pnpm run demo:repl # REPL agent demo (needs DEEPSEEK_API_KEY) pnpm run demo:acp # ACP server agent demo (needs DEEPSEEK_API_KEY) ``` For humans, start with the [development guide](docs/development.md) for local setup, hooks, environment variables, and quality gates, then read the [architecture design](docs/architecture.md) and [documentation graph index](docs/graph-atlas.md) before package work. Local context lives in [packages/](packages/) and [vendor/](vendor/). For agents, follow [AGENTS.md](AGENTS.md).