DeepSeek published DeepSeek Harness (dsh), its own open-source agent harness, on GitHub this afternoon under an MIT license. The repo drew 18,143 stars in its first two hours, and its architecture treats every capability, models included, as a swappable plugin.
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Transcript
DeepSeek just open sourced the agent harness it builds on. It's called dsh, it went up on GitHub this afternoon under an MIT license, and two hours later it had eighteen thousand stars. Here's the part worth reading. Most agent tools let you extend the edges. Add a tool, wire up an MCP server. The core loop stays fixed, because the core loop is the product. DeepSeek inverted that. The whole thing runs on a plugin kernel, and the model provider is just another package implementing an interface. Not a setting. A package. Which means somebody outside DeepSeek can ship a provider for a model DeepSeek didn't train, and nobody has to ask permission. Now the honest part. Two provider plugins ship today, and both are DeepSeek's. The interfaces exist. The implementations mostly don't. The README warns in capitals that breaking changes are coming, and there's no tagged release. So go read how the boundaries are drawn. Take the ideas. Just don't put it in a pipeline you care about yet.