DeepSeek Harness Developer Preview

DeepSeek has released the developer preview of DeepSeek Harness (DSH), which supports agents in understanding environments, using tools, and performing real-world tasks. This framework defines the model as the 'soul' and the harness as the 'body' to help agents operate in actual environments.

Plugin-Centric Architecture All features are built on a plugin system based on the Cordis kernel. All agent capabilities, including models, tools, skills, sandboxes, storage, and UI, are provided as plugins. This allows developers to select, replace, or extend features through Configuration alone, without modifying source code.

Complete Execution Traceability All execution processes are recorded in an append-only session log. System prompts, reasoning processes, tool calls and results, and sub-agent scheduling are all stored. Users can review, replay, or search these records via the Trajectory view, or Resume execution from a specific point or Fork it.

Various Runtime Modes

• Standard mode: A full-stack mode providing a complete toolset, including file editing, shell, web search, and planning.
• Code mode: A mode where the model directly generates and executes code via the TypeScript SDK to perform multi-step tasks.
• Minimal mode: A mode providing only minimal tools, such as bash and a file editor, for benchmarking.
• Creator mode: A developer mode for creating custom agent presets and experimenting with plugins.