dsh-chat-image

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Renders chat Markdown image references (![alt](https://raw.githubusercontent.com/Niobium-41-nb/dsh-chat-image/HEAD/path title)) as a gallery under each closing assistant message in the DeepSeek Harness web GUI.

• Local workspace paths load through a validated host route (/dsh-chat-image): the path must resolve inside a registered workspace and be a regular file of at most 32 MiB; the file is served with an extension-derived content type.
• http(s) references are skipped — the built-in markdown renderer already shows them inline.
• data: URLs render directly.
• The optional title renders as the caption below the image and as the hover hint; a local file without a title shows its absolute path as the hover hint.
• A reference whose image fails to load (missing file, out of workspace, over the byte cap) falls back to its alt text; an empty alt renders nothing for that item.
• Clicking a local image opens the file through the same host opener the tool rows use.

Install

As a standalone bundle, from a dsh installation:

# from npm
dsh plugin --profile web add dsh-chat-image

# from the git repository
dsh plugin --profile web add github:Niobium-41-nb/dsh-chat-image

# from a tarball
dsh plugin --profile web add ./dsh-chat-image-0.1.0.tgz

A git install fetches sources and runs the package's prepare build; pnpm ≥ 10 requires an explicit build allowance for that script (the add output prints the exact pnpm-workspace.yaml entry to add). The web profile's browser roster (clientModules) picks the browser half up automatically through the dsh.client manifest; the Loader mounts the host half through the bundle patch.

Usage

The model writes ordinary Markdown image references in its reply:

![架构图](https://raw.githubusercontent.com/Niobium-41-nb/dsh-chat-image/HEAD/docs/architecture.png "架构总览")
![](https://raw.githubusercontent.com/Niobium-41-nb/dsh-chat-image/HEAD/my image.png)      <!-- paths with spaces need angle brackets -->
![inline](data:image/png;base64,AAAA)

Relative paths resolve against the session working directory; absolute paths (drive-letter, /, or \\) pass through. Assistant closing turns only: the tail hole does not exist under user messages, and a turn with produced files keeps that row (the gallery shows only when it declines).

Develop

pnpm install
pnpm test      # vitest: route status matrix + reference extraction
pnpm build     # tsc types (lib/types) + tsdown bundles (lib/index.js, lib/client.js)

The browser bundle is CJS wrapped for the dsh loader (window.__ModuleLoader__.load) with only the frozen platform-module table external; the node half has no runtime imports. Both halves consume harness services structurally, so the package carries no runtime or type dependency on @deepseek-ai/* beyond the platform modules.

Known Limitations

• Assistant closing turns only. The turn-tail hole exists only under closing assistant messages.
• Chain exclusivity with the produced-files row. A turn that has both produced files and image references shows only the produced-files row (higher priority).
• CommonMark destination rules. A path containing spaces must be written in angle brackets (<my image.png>); an unquoted multi-word destination is parsed as path + title.
• Workspace containment. Only files inside a registered workspace are served; the route answers 403 for anything else, so it cannot read arbitrary host files.