DeepSeek releases Harness developer preview with source code
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DeepSeek Harness introduces a modular plugin architecture that lets developers swap or recompose agent capabilities, such as models, tools, and UI, without modifying the source code. This enables production engineers to customize and extend agent functionality, such as tracing and logging, with greater flexibility. It allows for more adaptable and configurable LLM and agent deployments.
DeepSeek open-sourced its own agent harness where every capability—models, tools, sandboxes, loops, scheduling, even the UI—is a swappable Cordis plugin, plus an append-only session log capturing system prompts, reasoning, tool calls, and context injections that you can resume, fork, search, and replay. This gives you a fully inspectable, model-agnostic scaffold for building coding agents, with a Code mode that lets the model orchestrate multi-step tool calls as a single TypeScript program instead of round-tripping each call—useful if you want a debuggable alternative to opaque proprietary harnesses.