dsh-prompt-optimizer: One-Click Prompt Optimization and Long-Text Input Enhancement

Introduction¶

The DeepSeek Harness (DSH) web plugin aims to address poor long-text input experience and unclear prompt structure. Maintained by wangyuanchuan2022. It adds an “Optimize” button to the input toolbar, fixes a rendering defect in the Composer component when handling long text, and supports Tab-key indentation for easier editing of structured content.

Core Features¶

One-Click Prompt Optimization¶

Adds an “Optimize” button to the input toolbar (left of the send button). When clicked, the plugin reads the current draft and triggers a helper LLM call via the host-side /optimize command. The optimization result is written directly back to the input box, rewriting the draft into a clearer structured prompt.

This feature is designed for DSH coding agent scenarios. During optimization, context details such as file paths and identifiers are preserved verbatim, and U+FFFC attachment/reference placeholders are passed through in place (to avoid breaking host-side bindings). Structural conventions follow the drafter’s language, and instructions are required to include verifiable completion criteria for the agent.

The optimization call uses a low thinking effort by default (reasoningEffort: low) for speed. It can be set to off (no thinking, fastest) or high / max in the configuration for more thorough rewrite quality.

Model routing is resolved by priority: the model currently selected in the session → the routing of the most recent request in session logs (request/header) → the first available provider. You can also explicitly pin provider + model in cordis.patch.yml.

In addition to the toolbar button, you can manually optimize by entering /optimize <draft text> in the command line.

Long Text Support (Input Box Architecture Fix)¶

Fixed display defects in the Composer component under long text. The original framework’s <textarea> used height:100%, but as a replaced element, it fell back to its intrinsic height (about 52px) inside an auto-height parent container, causing long text to be editable only in the top two lines.

The plugin uses ResizeObserver to synchronize the textarea’s explicit pixel height to the height of a hidden mirror element, restoring the intended architecture of “textarea fills the full text → scroll container crops/scrolls.” At the same time, the maximum height of the input text area is increased from 336px to min(55vh, 600px).

In editing experience, the input box supports inserting or deleting two-space indentation via Tab / Shift+Tab, and supports block-level indent/outdent for multi-line selections.

Configuration¶

The plugin is configured via cordis.patch.yml. Main parameters:

Installation and Enablement¶

Install via GitHub repo URL. Run the following command to add the plugin to the web profile bundles list:

dsh plugin --profile web add github:wangyuanchuan2022/dsh-prompt-optimizer

After installation, restart dsh web and refresh the page to use it.

Full Git URL: dsh plugin --profile web add https://github.com/wangyuanchuan2022/dsh-prompt-optimizer.git.
Later updates: dsh plugin --profile web update dsh-prompt-optimizer.

Limitations¶

• If the draft contains attachment or reference placeholders (U+FFFC chip), the “Optimize” button is disabled, because rewriting breaks the correspondence between chips and the occurrence table.
• The optimization result replaces the entire draft via inputActions.setDraft; rollback requires the input field’s undo feature.

Conclusion¶

The plugin follows the MIT license. The DSH philosophy is “everything is a plugin,” and the community catalog (SkillHub) has no official affiliation with DeepSeek. To view the catalog or source code, visit Plugin Catalog or GitHub repository.