ZSeven-W/dsh-openpencil
OpenPencil design preview and editing plugin.
Install
via npm
Resolves a published tarball rather than cloning the repository, and installs without any extra setup. Swap `web` for your profile name if you run another one.
via GitHub · npm package
Installing from GitHub runs the project's build script, which pnpm blocks until you allowlist it — run the command once and pnpm prints the exact key to add under `allowBuilds` in ~/.dsh/profiles/web/pnpm-workspace.yaml.
What happened when we ran it
Installed cleanly when we ran it
Every command here is run in a throwaway container against a clean profile, and the result is whatever the harness recorded — not a guess from the source. Last run yesterday.
Due diligence
What it is — The DSH OpenPencil plugin integrates DeepSeek Harness with OpenPencil to preview and edit real .op documents inside conversations.
Who it is for — When using DeepSeek Harness for design conversations requiring exact multi-frame previews and interactive editing of documents, this plugin applies to users needing that capability. If the user is not employing DeepSeek Harness to drive agent-native tools, this plugin is not required.
Watch out — The sandbox test passed with successful registration in a new profile. No obvious issues found.
The verdict — In agent-native design tool scenarios I would install it because it provides a complete workflow supported by transactional safety and capability-gated grants.
Generated by grok-4.6, and a starting point rather than a verdict. Where it says a plugin installs or does not, that is from a real run in a clean profile — everything else is read off the repository. Trust the source over this.
dsh-openpencil is a DeepSeek Harness plugin that lets an agent preview, inspect, create and edit real OpenPencil .op documents inside a conversation. It connects DSH to OpenPencil’s headless exporter and Web SDK: openpencil_render creates an immutable, content-addressed snapshot, renders the top-level frames, and can open an interactive canvas; editable: true opens the managed editor. The canvas supports pan, zoom and fit, while the editor provides selection, layers, properties, drawing tools, undo/redo and explicit saving.
The agent works through five tools: openpencil_new, openpencil_create, openpencil_edit, openpencil_render and openpencil_selection. Design changes are expressed as transactional batch_design programs. New documents are written to workspace-relative .op paths through DSH’s sandboxed filesystem only after the complete batch succeeds. Existing paths are not overwritten; saves use an optimistic hash and atomic replacement. Preview and editor access is granted through signed, hash-bound capabilities rather than exposing arbitrary host paths in browser metadata or tool results.
dsh-openpencil is intended for agents handling editable design documents and workflows that need frame previews or live canvas inspection, rather than a generated image alone. It depends on DeepSeek Harness and the OpenPencil runtime, and is tested with DSH 0.1.0-rc.6; it is the wrong choice when the task does not involve .op documents or when a static image is sufficient.
The plugin is installed into a DSH profile and the README reports testing with DSH 0.1.0-rc.6. It uses OpenPencil’s headless exporter and Web SDK to process .op documents. The documented workflow runs in the DSH web app. Documents are addressed by workspace-relative paths and saved through DSH’s sandboxed filesystem.
The agent-facing tools are:
| Tool | Behaviour |
|---|---|
openpencil_new |
Creates a new .op from one batch_design program. It requires a new path and does not overwrite an existing path. |
openpencil_create |
Applies a transactional batch_design program to an existing live canvas. |
openpencil_edit |
Changes an explicit node, or the single node selected by the user. |
openpencil_render |
Creates an immutable, content-addressed .op snapshot and renders every top-level frame on the active page. |
openpencil_selection |
Reads the nodes selected in the live editor canvas. |
openpencil_render accepts the documented options scale, editable and autoOpen. editable: true opens the managed editor; autoOpen: true is used in the documented workflow to present the returned document.
A batch_design program runs in a private managed OpenPencil daemon. For a new document, publication occurs only after the whole batch succeeds, so a failed batch does not leave an empty file. Rendering produces a large preview for the first top-level frame and a thumbnail rail for additional frames. The interactive canvas is read-only; the managed editor supplies editing and explicit save operations.
Preview and editor access use signed, hash-bound capabilities. Arbitrary host paths are not exposed through browser metadata, and these capabilities are not included in canonical tool results or model context. Existing saves use an optimistic hash and atomic replace.
Written from the project's own documentation and kept in sync with it. Where the two disagree, the source is authoritative — read the README on GitHub
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