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docs(mcp-server): mermaid is in the bundled draw.io, which has no image proxy

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- Mermaid's converter is in js/extensions.min.js, which the editor loads at
  startup, so the README no longer lists it as left out; the org chart
  layout (js/orgchart.min.js) is the example of a feature that is.
- Note that the bundled copy, like the web app's, has no /drawio/proxy:
  images from other websites, including those in some templates, are left
  out of exports and thumbnails. The guard's comment names this as a known
  limitation it does not cover.
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dayuan.jiang
2026-10-11 20:56:07 +09:00
parent a407f66268
commit 20ce02a602
2 changed files with 10 additions and 3 deletions
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packages/mcp-server/README.md
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@@ -217,7 +217,9 @@ docker run -d -p 8080:8080 jgraph/drawio
Then set `DRAWIO_BASE_URL=http://localhost:8080` (or your server's URL). The preview page loads nothing else from the internet, so with a local draw.io it works offline. One exception: shapes from the Material Design library show icons from `fonts.gstatic.com`.
Without `DRAWIO_BASE_URL` the preview uses the trimmed draw.io copy bundled with this package. It has the editor, the shape libraries, the templates and PlantUML; features that load more code when used (Mermaid, for example) are not included. Set `DRAWIO_BASE_URL` to a full draw.io if you need them.
Without `DRAWIO_BASE_URL` the preview uses the trimmed draw.io copy bundled with this package. It has the editor, the shape libraries, the templates, PlantUML and Mermaid; features that load more code when used (the org chart layout, for example) are not included. Set `DRAWIO_BASE_URL` to a full draw.io if you need them.
Like the web app's bundled copy, it has no image proxy (`/drawio/proxy`): images from other websites, including the avatars in the Org Chart and Mind Map templates and the Arista icons in the network templates, show on the canvas only when online and are left out of PNG and SVG exports and version thumbnails. Insert such images from a file instead, or set `DRAWIO_BASE_URL` to a full draw.io (the `jgraph/drawio` Docker image includes the proxy). See [Offline deployment](https://github.com/DayuanJiang/next-ai-draw-io/blob/main/docs/en/offline-deployment.md).
## Troubleshooting
packages/mcp-server/scripts/check-drawio-files.mjs
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@@ -186,8 +186,13 @@ const MATH_DOC = doc(
// Dialogs and toggles, by draw.io action name (Actions.js); each is closed
// again right after it opened. Insert > Template and Insert > Advanced >
// PlantUML, which load files when used, are driven below. Left out on
// purpose, to keep the package small: Mermaid (it loads its own code).
// PlantUML, which load files when used, are driven below. Mermaid needs no
// extra files: its converter is in js/extensions.min.js, which the editor
// loads at startup. Left out on purpose, to keep the package small: the org
// chart layout (it loads js/orgchart.min.js). Not covered either: images
// from other websites in some templates (Org Chart avatars, Arista icons)
// and the /drawio/proxy requests draw.io makes for them when exporting;
// the copy has no proxy, a known limitation (see the README).
const ACTIONS = [
"editData",
"editDiagram",