Summary
DeepSeek Harness treats models, tools, skills, sessions, sandboxes, filesystems, loops, orchestration and the user interface as plugins powered by the Cordis framework. The project is available through npm or source, but its README warns that compatibility-breaking changes are expected during the developer preview.
Why it matters
The release shifts competition in coding agents toward the harness layer, where context management, permissions, tool orchestration and workflow state can materially change model behaviour.
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