DeepSeek

DeepSeek is an AI research and engineering company known for frontier open-weights models and open-source infrastructure. In 2026, DeepSeek released the DeepSeek Harness developer preview, advancing the architecture paradigm of Agent = Model + Harness.

Key Contributions to Agent Architecture

DeepSeek structures agent systems by separating the reasoning engine from the operational execution layer:

1. The Model-Harness Split: DeepSeek formalized that while “the model is the soul of an agent,” the harness is what allows an agent to understand its environment, operate tools, and maintain durability in real-world environments.
2. Microkernel Plugin Architecture: In DeepSeek Harness, DeepSeek adopted Cordis as an in-process microkernel where every agent subsystem (models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and UI) is implemented as a hot-pluggable service.
3. Traceability & Deterministic Replay: DeepSeek emphasizes append-only session event streams, ensuring every context injection, tool call, reasoning trace, and subagent invocation can be inspected, forked, resumed, and replayed from the same stream.

Related Pages

• cordis framework
• deepseek harness
• agent harness engineering
• agent native infrastructure
• anthropic