DeepSeek Harness developer preview: Everything is a plugin

and replay all operate on the same event stream. Multiple runtime modes Standard mode includes the full toolset. Code mode uses model-generated code to orchestrate multiple rounds of tool calls. Minimal mode keeps only a shell tool and a file editor for benchmarking models in a minimal environment. Creator mode lets you inspect the current runtime， or extend any capability in configuration without changing the DeepSeek Harness source code. Every run is traceable Everything the model sees is recorded in an append-only session log: system prompts。

plugin experiments， file and web search， reasoning， storage， and every context injection. In the Trajectory view， with all Standard mode capabilities plus runtime inspection， planning， and the UI. Cordis services and events let the plugins work together. Developers can select。

swap， loops， and preset-authoring guidance. ， tools。

Everything is a plugin DeepSeek Harness is built on Cordiss plugin system. Plugins provide every agent capability，。

including models， sessions， skills。

shell， subagent scheduling， and workflows. Code mode All Standard mode capabilities。

test Cordis plugins in memory， and combine them into new modes. dsh-demo Creator mode Describe what you want to build Standard mode Full coding agent with file editing， subagents， search， tool calls and results， with tools exposed through the Code Mode SDK so the model can combine multi-step operations in one TypeScript program. Minimal mode Two-tool coding agent with persistent bash and str_replace_editor. Creator mode Built for creating custom agent presets， you can inspect these records by source. Resume， skills， fork， goals， sandboxes， scheduling。