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DeepSeek Harness

Open source agent harness by DeepSeek, with a local Web UI and CLI (dsh) and an architecture where everything is a plugin. Free under the MIT license, in developer preview.

OPEN SOURCEcodingdeveloperagentscliopen-sourceplugins
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DeepSeek model API pricing

ModelInputOutput
DeepSeek V4.1 Flash0.040.29
DeepSeek V4 Flash 07310.020.32
DeepSeek V4 Flash 04230.140.28
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What's included

DeepSeek Harness (dsh) is DeepSeek AI's open source agent harness. Its architecture follows the principle that everything is a plugin, built on the Cordis framework, which allows assembling modular agents and composing functionality from community plugins (identified on GitHub by the dsh-plugin topic). It runs locally on Node.js: the command npx @deepseek-ai/dsh web starts a Web UI served at 127.0.0.1:3080, and it can also be used via CLI or built from source. The project is in developer preview, iterating quickly with changes that may break compatibility between versions. It is free and open source under the MIT license, with support via GitHub Discussions and Discord.