DeepSeek Harness: an agent built entirely from plugins

DeepSeek AI open-sourced DeepSeek Harness (dsh), an agent environment where session storage, sandbox, context compression and the model itself are plugins. The MIT-licensed project is in developer preview, runs on Cordis with profiles and patches reloadable on the fly.

• Everything in dsh is a plugin: sessions, sandbox, context compression, model
• Profiles replace modes: web, headless for CI, sdk via JSON-RPC, acp for editor
• Includes subagents, JavaScript workflows and ralph loop with fresh agents
• Code is MIT-licensed, breaking changes possible in developer preview