deepseek harness - open-source plugin-first agent runtime
About DeepSeek Harness
MIT-licensed agent harness from DeepSeek AI, built on the idea that everything is a plugin: models, tools, skills, sessions, sandboxes, storage, loops, scheduling and the UI can each be swapped in configuration without touching the source. Start it with one command and it opens a local Web UI at 127.0.0.1:3080, with an append-only trajectory log you can resume, fork, search and replay. Read the trade-off before installing: DeepSeek calls it a developer preview, warns there will be compatibility-breaking changes, and states plainly that it has had no security audit and must not be treated as production-ready.
Key Capabilities
Everything is a plugin: models, tools, skills, sessions, sandboxes, storage, loops, scheduling and the UI are all swappable in configuration
One command to run: npx @deepseek-ai/dsh web opens a local Web UI at 127.0.0.1:3080
Four runtime modes: Standard for the full toolset, Code for model-generated orchestration, Minimal for benchmarking a model against a shell and an editor, Creator for building new modes
Append-only trajectory log records every prompt, tool call and context injection; resume, fork, search and replay run on the same event stream
Five shipped profiles: web, headless, sdk, sdk-minimal and acp
Model-agnostic: DeepSeek API keys plus other providers and custom OpenAI-compatible endpoints
208,900 GitHub stars and 24,367 forks as of 2 September 2026, three weeks after launch
Standout Features
Everything Is A Plugin
The Cordis kernel mounts every capability as a plugin, so models, tools, loops and even the UI are swapped in configuration rather than by forking
Four Runtime Modes
Standard, Code, Minimal and Creator; Minimal strips the agent to a shell and a file editor, which makes it a clean bench for comparing models
No Security Audit Yet
DeepSeek states it has had no security audit and must not be treated as production-ready; it executes model-generated commands and loads third-party plugins
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