Everything is a plugin
Replace or extend models, tools, context providers, permission policies, user interfaces, and workflows through the same plugin system.
DeepSeekCLI
DeepSeek Harness is an open-source, plugin-based agent harness in developer preview for building and running coding agents with a local Web UI.
DeepSeek Harness provides coding tools, traceable sessions, configurable workflows, and multiple runtime modes through a plugin-first architecture. It runs locally from the @deepseek-ai/dsh npm package and is currently an early developer preview that may introduce breaking changes.
DeepSeek Harness
Launch
$ npx @deepseek-ai/dsh webWhat can DeepSeek Harness do?
Traceable coding sessions
Inspect agent actions, tool calls, context, and session history so coding work remains observable and easier to debug.
Multiple runtime modes
Run the harness with its local Web UI or compose other interfaces and workflows on top of the same runtime.
Pricing
Individual
Open Source
Free
Frequently asked questions
What is DeepSeek Harness?
DeepSeek Harness is DeepSeek's open-source runtime for assembling and running coding agents from interchangeable plugins.
Is DeepSeek Harness production-ready?
No. DeepSeek labels it as a developer preview and warns that interfaces and behavior may change between releases.
How do I launch DeepSeek Harness?
With Node.js and npm available, run npx @deepseek-ai/dsh web to start the local Web interface.
Can I customize its models and tools?
Yes. Its plugin architecture is designed to make models, tools, context, permissions, interfaces, and workflows replaceable.
What license does DeepSeek Harness use?
DeepSeek Harness is open-source software released under the MIT license.