DeepSeek Just Built the Next Generation of Coding Agents

DeepSeek Harness represents a significant shift in AI coding agents by offering an entirely plugin-based architecture, contrasting sharply with closed systems like Claude Code or Cursor. The framework is designed for extensibility, allowing developers to treat every interface component—from chat interactions and tool calls to sub-agent delegations—as modular, toggleable units. The video guides viewers through the installation process via npm or source code, configuring model API keys for local operation, and utilizing 'Creator mode' to build custom functionality. A key feature highlighted is the 'Trajectory' view, which provides deep observability into the agent's internal reasoning and action loops. By enabling granular control over how the agent operates, this framework is positioned as a powerful, albeit currently rough-around-the-edges, foundation for future autonomous software development workflows.