dsh-diagram

dsh-diagram

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Your DSH session already understands the article. Turn that understanding into an Excalidraw canvas you can keep editing.

The Agent creates the first structure; you refine it in DSH, autosave it, and export it. The result stays editable instead of becoming disposable Mermaid output.

Install it in one command, then type / and pick canvas-diagram in any DSH session:

npx -y @deepseek-ai/[email protected] plugin --profile web add dsh-diagram@latest

Useful for your DSH toolbox? Star the repo so you can find it when the next long article needs a diagram.

Full requirements and verification: Quick install.

Why dsh-diagram?

• Editable, not disposable. Continue working in a full Excalidraw canvas instead of accepting a static generated image.
• Clean or sketchnote. Keep the default precise diagram, or ask for a warm-paper editorial sketch with handwritten text, marker washes, and editable semantic line icons.
• Built into the conversation. A live preview card lands in the chat flow right after creation, and the Canvas tab opens the full editor without leaving the DSH session.
• Saved and ready to share. Revision-safe autosave protects newer work, and export produces .excalidraw, SVG, or PNG.

Quick install

Requirements:

• DeepSeek Harness 0.1.1-rc.2 (latest); also verified on 0.1.1-rc.1, 0.1.0-rc.8 and 0.1.0-rc.6
• Node.js ^22.19.0 or >=24.0.0
• pnpm >=10 on PATH (the DSH plugin command delegates package management to pnpm)
• DSH Web bound to 127.0.0.1

DeepSeek Harness does not install a global dsh command by default; the official way to launch it is through npx. The commands below work on any machine that meets the requirements:

npx -y @deepseek-ai/[email protected] plugin --profile web add dsh-diagram@latest
npx -y @deepseek-ai/[email protected] --profile web --dump-config
npx -y @deepseek-ai/[email protected] web

The config dump should contain this block:

# == dsh-diagram
- id: diagram
  name: dsh-diagram

If DSH Web was already running, restart it after adding or updating the plugin. Then open an existing session and look for the Canvas tab.

Running DSH from source

Run the same commands from a DeepSeek Harness checkout that matches a supported release, using pnpm dsh as the prefix:

pnpm dsh plugin --profile web add dsh-diagram@latest
pnpm dsh --profile web --dump-config
pnpm dsh web

If dsh is on your PATH

If you installed the CLI globally or created a shell alias, the short form works the same way:

dsh plugin --profile web add dsh-diagram@latest
dsh --profile web --dump-config
dsh web

Later sections use this short dsh form; substitute the npx -y @deepseek-ai/[email protected] or pnpm dsh prefix that matches how you run DSH.

Create your first diagram

1. Open a DSH session that already contains the article, or let the Agent read it with DSH's existing file or Web tools.
2. Type / in the composer and pick canvas-diagram — the plugin registers this skill so you never have to remember a tool name. Plain requests such as "把这篇文章画成架构图" route through the same skill automatically. An explicit prompt also works:

   Create one clear diagram for this article. Choose the most suitable diagram type, call diagram_create, and keep the title and node labels concise.

For the optional editorial hand-drawn treatment, say so explicitly:

   Turn this article into an editable sketchnote diagram. Use semantic icons only for the key concepts.

1. After the tool finishes, select Canvas at the top of the conversation.
2. Edit the diagram directly. Saved means the Host has completed a durable write.
3. Export the result, or ask the Agent to call diagram_read before continuing from your manual changes.

The plugin supports report boards, flowcharts, architecture diagrams, timelines, hierarchies, comparisons, and relationship diagrams. Visual style is independent of diagram type: omitted/clean preserves the original rendering, while sketchnote uses warm paper, near-black ink, low-saturation marker fills, handwritten text, and a controlled set of native Excalidraw icons. Evidence-heavy reports use deterministic full-width context/outcome bands, aligned main columns, semantic colors, and converter-measured native text placement. Report and grouped-architecture connectors select stable node-boundary ports and orthogonal corridors while avoiding unrelated nodes, group headings, and independent routed edges.

What it adds

The plugin does not fetch articles and does not inject UI into arbitrary websites. Article acquisition stays with the DSH conversation, file tools, or Web tools.

Compatibility

The npm package has no install lifecycle scripts. Installation adds a bundle to the selected DSH profile; it does not compile code or modify the DeepSeek Harness source tree.

Manage the installation

Update

dsh plugin --profile web update dsh-diagram --latest

Restart DSH Web after the update.

Install the exact latest public GitHub Release artifact

The release page publishes the same prebuilt tarball with a SHA-256 checksum:

dsh plugin --profile web add \
  https://github.com/hanzhangzzz/dsh-diagram/releases/download/v0.4.0/dsh-diagram-0.4.0.tgz

See v0.4.0 for the checksum and release notes.

Remove

dsh plugin --profile web remove dsh-diagram

Removing the bundle does not delete saved diagram sidecar data. Reinstalling the plugin can make that data available again to the same Session identity.

Data, security, and limits

• The Excalidraw scene is the current document. The original semantic specification is retained only as its creation source.
• A diagram is bound to its Session id and {createdAt, cwd} lifecycle fingerprint. A reused Session id cannot read older data.
• Session fork and Session export do not copy or include diagram sidecar data.
• Editor assets and fonts are self-hosted by the bundle; the canvas does not depend on an external CDN.
• Static paths, RPC bodies, request origin, Session ownership, and scene contents are validated by the Host before persistence.
• Images, iframes, embeddables, external links, and non-empty binary files are rejected in this release.
• Defaults limit each scene to 1 MiB and all stored diagram records to 64 MiB. Element, text, diagram-count, and byte limits are explicit in cordis.patch.yml.
• The plugin intentionally refuses to load when DSH Web binds to 0.0.0.0; this release does not expose the canvas RPC to a LAN.

Troubleshooting

The Canvas tab is missing

Confirm that you installed the plugin into the web profile, that --dump-config contains the dsh-diagram block shown above, and that DSH Web was restarted after installation.

The Agent wrote an SVG or Mermaid file instead of using the Canvas

The model chooses freely among all tools and workspace skills in the session. The plugin registers its own canvas-diagram skill so generic diagram requests normally route to the canvas; if a workspace skill with a stronger matching description still wins, pick canvas-diagram from the / menu or mention the Canvas explicitly — for example, "call diagram_create so I can edit the result in the Canvas tab".

The Agent does not know about my manual edits

Manual edits are not silently injected into model context. Ask the Agent to call diagram_read; its result is then recorded in the normal conversation transcript.

Can the plugin fetch an article from a URL?

No. First let DSH obtain the content through the conversation, a file tool, or a Web tool. Then ask for a diagram.

Why does startup fail with 0.0.0.0?

The canvas RPC is not designed for LAN exposure in this release. The plugin fails closed unless DSH Web is physically bound to 127.0.0.1.

What should I do after a revision conflict?

The editor keeps the local draft. Export it before choosing Reload server version if you need to preserve both versions.

Why can SVG export log a font fallback warning?

Under the strict content security policy, Excalidraw may fall back from glyph subsetting to embedding the full self-hosted font. The exported SVG remains self-contained; the plugin does not enable unsafe-eval to suppress the warning.

Build from source

git clone https://github.com/hanzhangzzz/dsh-diagram.git
cd dsh-diagram
pnpm install --frozen-lockfile
pnpm run bundle
pnpm pack

Install the generated tarball from a DeepSeek Harness checkout:

cd /path/to/deepseek-harness
pnpm dsh plugin --profile web add /absolute/path/to/dsh-diagram-VERSION.tgz
pnpm dsh --profile web --dump-config
pnpm dsh web

Developer checks:

pnpm run typecheck
pnpm run test
pnpm run bundle
pnpm pack --json
pnpm run smoke:dsh-install

Every installable development commit must use a new prerelease version; never repack changed code under an existing version. Before a public release, pack once and exercise the same DSH profile update path from the previous public version to that exact tarball:

pnpm run smoke:dsh-install -- \
  --tarball /absolute/path/to/dsh-diagram-VERSION.tgz \
  --upgrade-from PREVIOUS_PUBLIC_VERSION

This verifies the client-side update mechanics and both pre/post-update Web boots without publishing the candidate. Registry discovery through @latest is verified separately after the version is publicly released.

See DESIGN.md for the product and implementation decisions.

Contributing

Bug reports and focused pull requests are welcome in GitHub Issues. If the plugin improves your article-to-diagram workflow, a GitHub star helps other DSH users discover it.

License

The plugin's own code is licensed under MIT. Licenses for bundled JavaScript and self-hosted fonts are listed in THIRD_PARTY_NOTICES.md and third_party_licenses/.