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feat(mcp-server): serve the canvas shell at /shell/ behind DRAWIO_PREVIEW_UI

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GET /shell/ fills the page template's {{CONFIG_JSON}} with the session,
the API token, where draw.io comes from and the host's editor settings,
with the classic page's security headers; /shell/<file> serves the built
files like the draw.io copy. start_session opens the shell when
DRAWIO_PREVIEW_UI=shell; the classic page stays the default.
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dayuan.jiang
2026-10-11 20:56:07 +09:00
parent 77c6a2d807
commit b6f42bcddc
4 changed files with 372 additions and 56 deletions
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packages/mcp-server/README.md
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@@ -188,6 +188,7 @@ To give the AI your own drawing rules, write them in `~/.next-ai-drawio/instruct
| `DRAWIO_LANG` | unset | Language of the draw.io editor. Unset, draw.io chooses: the browser language on `embed.diagrams.net`, English on a self-hosted draw.io until the user picks one under **Extras > Language**. A code such as `en`, `zh`, `zh-tw`, `ja` or `de` fixes it and hides that submenu. |
| `DRAWIO_UI` | unset | draw.io theme. Unset, the user picks one under **Extras > Theme** and draw.io remembers it. `kennedy`, `atlas`, `dark`, `min`, `sketch` or `simple` fixes the theme and hides that menu. |
| `DRAWIO_DARK` | `auto` | Dark mode of the draw.io editor: `auto` follows the system, `1` forces dark, `0` forces light. The page header keeps following the system. |
| `DRAWIO_PREVIEW_UI` | `classic` | The preview page `start_session` opens. `shell` opens the new canvas page built from the web app's canvas (in progress: it does not sync with the server yet). |
| `DRAWIO_AUTO_SCREENSHOT` | unset | Set to `true` to attach a screenshot to every `create_new_diagram` and `edit_diagram` result, so the AI checks each drawing. Costs 2 to 10 s per call; the preview tab must be open and in front. A call can still pass `screenshot: false`. |
| `DEBUG` | unset | Set to `true` to log debug messages to stderr. |