DeepSeek Releases Open-Source Harness Agent Framework in v0.1.0 Preview

DeepSeek Harness # DeepSeek Harness DeepSeek Harness is now an official open-source agent framework from DeepSeek. Released as a developer preview, it provides a plugin-first runtime for models, tools, skills, sessions, sandboxes, storage, orchestration, and a web interface. `npx @deepseek-ai/dsh web` Independent source-based guide. DeepSeek Harness is available under the MIT License as a developer preview; its APIs and plugin contracts may still change before a stable release. Aug 13, 2026 DeepSeek published the official Harness website, source repository, and developer preview package. The framework is open source and can be inspected, modified, and self-hosted under the MIT License. Developer Preview [...] Official product pageDeepSeek Harness developer previewDeepSeek's overview of the framework, plugin architecture, runtime concepts, and quick-start path.Source codedeepseek-ai/deepseek-harnessThe official MIT-licensed repository, including the framework source, documentati

DeepSeek Harness follows the industry formula Model + Harness = Agent, supplying the runtime scaffolding around DeepSeek's V4 models. DeepSeek assembled a dedicated harness team in March 2026, explicitly benchmarking its work against Anthropic's Claude Code. DeepSeek officially launched DeepSeek Harness v0.1 on August 13, 2026, as an open-source MIT-licensed Developer Preview. The framework uses a Cordis-based architecture in which models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI can be swapped or recomposed as plugins. Its minimalist mode was used for published V4-Flash agent scores of 82.7 on TerminalBench 2.1, 76.7 on Cybergym, and 70.3 on Toolathlon verified. [...] DeepSeek Harness is DeepSeek's open-source agent framework and coding-agent runtime. Its v0.1 Developer Preview officially launched on August 13, 2026, under the MIT license. It supplies the engineering layer around a language model — context management, tool calling, file editing, t

| | | | DeepSeek Harness developer preview (deepseek.com) | | 747 points by bjin 16 days ago | hide | past | favorite | 314 comments | | | | | | --- | | | | | tianyicui 15 days ago | next (javascript:void(0)) Hi I'm one of the authors of DeepSeek Harness. It's just an early developer preview version we're presenting in MIT license currently. Expect lots of rough edges and compatibility-breaking changes. Any feedback and suggestions are more than welcome! | | | | | | julius 15 days ago | parent | next (javascript:void(0)) The best kept secret in AI training. Tianyi, since you are our insider. When you walk by the training teams office - how often do you see Pelicans on their screens? | | | | | | tianyicui 14 days ago | root | parent | next (javascript:void(0)) [...] is being on hn you should know that and not work for them. /s | | | | | | krautsourced 15 days ago | parent | prev | next (javascript:void(0)) By MIT currently, do you mean it will eventually ch

DeepSeek released DeepSeek Harness v0.1 in developer preview and published the full source code under the MIT license. The project ships as `dsh` at deepseek-ai/deepseek-harness. A harness is the layer between a model and the environment it acts in — the tools, files, sandboxes, and control loop that let an agent keep working. DeepSeek frames it as Agent = Model + Harness. Most harnesses hard-code that layer: the agent loop, the tool registry, and the session store are fixed, and extension happens only at whatever hooks the authors exposed. Harness takes the opposite position, stated in the first lines of its README: everything is a plugin. Models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI all sit behind Cordis plugin boundaries, and any of them can be [...] ## Is it deployable? Yes, but as developer infrastructure, not as a production agent product. v0.1 is a developer preview.

宝玉on X: "DeepSeek Harness 正式发布了，也是开源的" ... MIT 许可会让插件生态长得很快。0.1.0 还是开发者预览，我更想先看可观测性：Agent 跑偏时，能

DeepSeek Harness was just released with MIT license. The current 0.1.0 version is a developer preview, and may still have many rough edges.