dsh-system-prompt

In DeepSeek Harness the system prompt is assembled at runtime from the core framework, session presets, and every loaded plugin. Tweaking that output previously meant hand-coding YAML or forking source files. dsh-system-prompt ships a visual editor under Settings → System Prompt that turns the task into a safe, reversible, in-browser workflow.

Three edit modes cover the common needs: Use Default (no override, keep the auto-assembled result), Append Instructions (add custom text after the original guidance while preserving tool-usage rules), and Full Replace (rewrite the entire prompt body). The source selector follows the current session by default and pulls in plugin-contributed guidance for read, write, edit, glob, grep, background tasks, search, and sub-Agents; you can also target another loaded session manually. Built-in ergonomics include one-click load-then-edit of the full default prompt, save with a one-level undo, restore-to-default, draft retention on browser refresh, and revision-conflict rejection under concurrent edits.

The plugin suits DSH users who want to fine-tune system prompts without touching Harness install files: teams appending domain standards, adjusting tool-usage wording, or experimenting with full prompt rewrites while keeping a working fallback. Settings persist in the user-level settings document and take effect on the next model-request assembly–no Host restart, no rebuild, no npm publish required.