On August 13, DeepSeek announced the official global launch of its Harness Developer Preview (v0.1) for testing, along with its open-sourcing under the MIT license. The project adopts a plugin-based architecture, allowing Agent capabilities such as models, tools, skills, conversations, sandboxes, storage, scheduling, and UI to be freely combined and replaced through plugins without modifying the source code. Built on the Cordis plugin system, it supports plugin loading, unloading, and dependency management, offering four modes—Standard, PTC, Minimal, and Creative—to meet diverse development needs.