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Injects one fixed system-prompt section so the agent thinks and replies in Chinese, regardless of the user's language.

Cross-session plaintext memory: deterministic BM25 keyword recall (no embeddings), memory_save/list/search/confirm/forget tools behind a human-confirm gate, and global + project-scoped JSON stores that follow your git repo.

Draft polish for the DSH composer: one-click AI polish of the input draft (sparkles button next to send), with optional conversation context and a configurable model channel.

Conversation node appearance for the DeepSeek Harness web GUI: configurable per-category and per-tool colors (left accent bar + tinted background), plus a show-thinking toggle; pure frontend rendering, takes effect instantly and persists to the DSH user settings file.

Scroll-painting message rail for DeepSeek Harness: a slim right-edge rail with one indicator per user message, scroll-spy follows the reading position, hover unfolds a canvas with full message previews, and clicking jumps to any history message; animates in sync with better-sidebar panels.

Skill and MCP management center for DeepSeek Harness: browse and toggle user/project skills, add/edit/remove MCP servers hot without restart, with live per-session status in the sidebar.

Plugin center for DeepSeek Harness: installed-plugin metadata, a community market with stars and versions, one-click install and update, and a What's New dialog.

Dual-engine screen capture for DSH: inside the SSiD desktop shell, a global hotkey or tray opens a fullscreen box-select overlay (all monitors, per-display pixel-perfect frames) with in-place red-box annotation and a WeChat-style toolbar; in plain DSH (browser), the composer camera button captures the display via getDisplayMedia and reuses the same single-phase box-select + annotation overlay in-page. The cropped image lands in the current conversation composer through the official attachment intake.