fix(cascade-delete): recursively collect edge children (labels)

- Change from cellsToDelete.add(edgeId) to collectDescendants(edgeId)
- Fixes orphaned edge labels causing draw.io to crash/clear canvas
- Edge labels (parent=edgeId) are now deleted with their parent edge

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
           cache: 'npm'
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
 
       - name: Type check
         run: npx tsc --noEmit

Dockerfile

@@ -9,7 +9,7 @@ WORKDIR /app
 COPY package.json package-lock.json* ./
 
 # Install dependencies
-RUN npm ci
+RUN npm install
 
 # Stage 2: Build application
 FROM node:24-alpine AS builder

app/api/chat/route.ts

@@ -605,7 +605,7 @@ Notes:
 Operations:
 - update: Replace an existing cell by its id. Provide cell_id and complete new_xml.
 - add: Add a new cell. Provide cell_id (new unique id) and new_xml.
-- delete: Remove a cell by its id. Only cell_id is needed.
+- delete: Remove a cell. Cascade is automatic: children AND edges (source/target) are auto-deleted. Only specify ONE cell_id.
 
 For update/add, new_xml must be a complete mxCell element including mxGeometry.
 
@@ -614,8 +614,8 @@ For update/add, new_xml must be a complete mxCell element including mxGeometry.
 Example - Add a rectangle:
 {"operations": [{"operation": "add", "cell_id": "rect-1", "new_xml": "<mxCell id=\\"rect-1\\" value=\\"Hello\\" style=\\"rounded=0;\\" vertex=\\"1\\" parent=\\"1\\"><mxGeometry x=\\"100\\" y=\\"100\\" width=\\"120\\" height=\\"60\\" as=\\"geometry\\"/></mxCell>"}]}
 
-Example - Delete a cell:
+Example - Delete container (children & edges auto-deleted):
-{"operations": [{"operation": "delete", "cell_id": "rect-1"}]}`,
+{"operations": [{"operation": "delete", "cell_id": "2"}]}`,
                 inputSchema: z.object({
                     operations: z
                         .array(

lib/system-prompts.ts

@@ -276,7 +276,7 @@ edit_diagram uses ID-based operations to modify cells directly by their id attri
 **Operations:**
 - **update**: Replace an existing cell. Provide cell_id and new_xml.
 - **add**: Add a new cell. Provide cell_id (new unique id) and new_xml.
-- **delete**: Remove a cell. Only cell_id is needed.
+- **delete**: Remove a cell. **Cascade is automatic**: children AND edges (source/target) are auto-deleted. Only specify ONE cell_id.
 
 **Input Format:**
 \`\`\`json
@@ -301,9 +301,9 @@ Add new shape:
 {"operations": [{"operation": "add", "cell_id": "new1", "new_xml": "<mxCell id=\\"new1\\" value=\\"New Box\\" style=\\"rounded=1;fillColor=#dae8fc;\\" vertex=\\"1\\" parent=\\"1\\">\\n  <mxGeometry x=\\"400\\" y=\\"200\\" width=\\"120\\" height=\\"60\\" as=\\"geometry\\"/>\\n</mxCell>"}]}
 \`\`\`
 
-Delete cell:
+Delete container (children & edges auto-deleted):
 \`\`\`json
-{"operations": [{"operation": "delete", "cell_id": "5"}]}
+{"operations": [{"operation": "delete", "cell_id": "2"}]}
 \`\`\`
 
 **Error Recovery:**

lib/utils.ts

@@ -633,32 +633,77 @@ export function applyDiagramOperations(
             // Add to map
             cellMap.set(op.cell_id, importedNode)
         } else if (op.operation === "delete") {
-            const existingCell = cellMap.get(op.cell_id)
+            // Protect root cells from deletion
-            if (!existingCell) {
+            if (op.cell_id === "0" || op.cell_id === "1") {
                 errors.push({
                     type: "delete",
                     cellId: op.cell_id,
-                    message: `Cell with id="${op.cell_id}" not found`,
+                    message: `Cannot delete root cell "${op.cell_id}"`,
                 })
                 continue
             }
 
-            // Check for edges referencing this cell (warning only, still delete)
+            const existingCell = cellMap.get(op.cell_id)
-            const referencingEdges = root.querySelectorAll(
+            if (!existingCell) {
-                `mxCell[source="${op.cell_id}"], mxCell[target="${op.cell_id}"]`,
+                // Cell not found - might have been cascade-deleted by a previous operation
-            )
+                // Skip silently instead of erroring (AI may redundantly list children/edges)
-            if (referencingEdges.length > 0) {
+                continue
-                const edgeIds = Array.from(referencingEdges)
+            }
-                    .map((e) => e.getAttribute("id"))
+
-                    .join(", ")
+            // Cascade delete: collect all cells to delete (children + edges + self)
-                console.warn(
+            const cellsToDelete = new Set<string>()
-                    `[applyDiagramOperations] Deleting cell "${op.cell_id}" which is referenced by edges: ${edgeIds}`,
+
+            // Recursive function to find all descendants
+            const collectDescendants = (cellId: string) => {
+                if (cellsToDelete.has(cellId)) return
+                cellsToDelete.add(cellId)
+
+                // Find children (cells where parent === cellId)
+                const children = root.querySelectorAll(
+                    `mxCell[parent="${cellId}"]`,
+                )
+                children.forEach((child) => {
+                    const childId = child.getAttribute("id")
+                    if (childId && childId !== "0" && childId !== "1") {
+                        collectDescendants(childId)
+                    }
+                })
+            }
+
+            // Collect the target cell and all its descendants
+            collectDescendants(op.cell_id)
+
+            // Find edges referencing any of the cells to be deleted
+            // Also recursively collect children of those edges (e.g., edge labels)
+            for (const cellId of cellsToDelete) {
+                const referencingEdges = root.querySelectorAll(
+                    `mxCell[source="${cellId}"], mxCell[target="${cellId}"]`,
+                )
+                referencingEdges.forEach((edge) => {
+                    const edgeId = edge.getAttribute("id")
+                    // Protect root cells from being added via edge references
+                    if (edgeId && edgeId !== "0" && edgeId !== "1") {
+                        // Recurse to collect edge's children (like labels)
+                        collectDescendants(edgeId)
+                    }
+                })
+            }
+
+            // Log what will be deleted
+            if (cellsToDelete.size > 1) {
+                console.log(
+                    `[applyDiagramOperations] Cascade delete "${op.cell_id}" → deleting ${cellsToDelete.size} cells: ${Array.from(cellsToDelete).join(", ")}`,
                 )
             }
 
-            // Remove the node
+            // Delete all collected cells
-            existingCell.parentNode?.removeChild(existingCell)
+            for (const cellId of cellsToDelete) {
-            cellMap.delete(op.cell_id)
+                const cell = cellMap.get(cellId)
+                if (cell) {
+                    cell.parentNode?.removeChild(cell)
+                    cellMap.delete(cellId)
+                }
+            }
         }
     }
 

package.json

@@ -21,11 +21,11 @@
         "electron:compile": "npx esbuild electron/main/index.ts electron/preload/index.ts electron/preload/settings.ts --bundle --platform=node --outdir=dist-electron --external:electron --sourcemap --packages=external && npx shx cp -r electron/settings dist-electron/",
         "electron:start": "npx cross-env NODE_ENV=development npx electron .",
         "electron:prepare": "node scripts/prepare-electron-build.mjs",
-        "dist": "npm run electron:build && npm run electron:prepare && npx electron-builder",
+        "dist": "npm run electron:build && npm run electron:prepare && npx electron-builder --config electron/electron-builder.yml",
-        "dist:mac": "npm run electron:build && npm run electron:prepare && npx electron-builder --mac",
+        "dist:mac": "npm run electron:build && npm run electron:prepare && npx electron-builder --config electron/electron-builder.yml --mac",
-        "dist:win": "npm run electron:build && npm run electron:prepare && npx electron-builder --win",
+        "dist:win": "npm run electron:build && npm run electron:prepare && npx electron-builder --config electron/electron-builder.yml --win",
-        "dist:linux": "npm run electron:build && npm run electron:prepare && npx electron-builder --linux",
+        "dist:linux": "npm run electron:build && npm run electron:prepare && npx electron-builder --config electron/electron-builder.yml --linux",
-        "dist:all": "npm run electron:build && npm run electron:prepare && npx electron-builder --mac --win --linux"
+        "dist:all": "npm run electron:build && npm run electron:prepare && npx electron-builder --config electron/electron-builder.yml --mac --win --linux"
     },
     "dependencies": {
         "@ai-sdk/amazon-bedrock": "^4.0.1",

packages/mcp-server/README.md

@@ -97,7 +97,7 @@ Use the standard MCP configuration with:
 | Tool | Description |
 |------|-------------|
 | `start_session` | Opens browser with real-time diagram preview |
-| `display_diagram` | Create a new diagram from XML |
+| `create_new_diagram` | Create a new diagram from XML (requires `xml` argument) |
 | `edit_diagram` | Edit diagram by ID-based operations (update/add/delete cells) |
 | `get_diagram` | Get the current diagram XML |
 | `export_diagram` | Save diagram to a `.drawio` file |

packages/mcp-server/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@next-ai-drawio/mcp-server",
-    "version": "0.1.6",
+    "version": "0.1.10",
     "description": "MCP server for Next AI Draw.io - AI-powered diagram generation with real-time browser preview",
     "type": "module",
     "main": "dist/index.js",

packages/mcp-server/src/diagram-operations.ts

@@ -182,32 +182,77 @@ export function applyDiagramOperations(
             // Add to map
             cellMap.set(op.cell_id, importedNode)
         } else if (op.operation === "delete") {
-            const existingCell = cellMap.get(op.cell_id)
+            // Protect root cells from deletion
-            if (!existingCell) {
+            if (op.cell_id === "0" || op.cell_id === "1") {
                 errors.push({
                     type: "delete",
                     cellId: op.cell_id,
-                    message: `Cell with id="${op.cell_id}" not found`,
+                    message: `Cannot delete root cell "${op.cell_id}"`,
                 })
                 continue
             }
 
-            // Check for edges referencing this cell (warning only, still delete)
+            const existingCell = cellMap.get(op.cell_id)
-            const referencingEdges = root.querySelectorAll(
+            if (!existingCell) {
-                `mxCell[source="${op.cell_id}"], mxCell[target="${op.cell_id}"]`,
+                // Cell not found - might have been cascade-deleted by a previous operation
-            )
+                // Skip silently instead of erroring (AI may redundantly list children/edges)
-            if (referencingEdges.length > 0) {
+                continue
-                const edgeIds = Array.from(referencingEdges)
+            }
-                    .map((e) => e.getAttribute("id"))
+
-                    .join(", ")
+            // Cascade delete: collect all cells to delete (children + edges + self)
-                console.warn(
+            const cellsToDelete = new Set<string>()
-                    `[applyDiagramOperations] Deleting cell "${op.cell_id}" which is referenced by edges: ${edgeIds}`,
+
+            // Recursive function to find all descendants
+            const collectDescendants = (cellId: string) => {
+                if (cellsToDelete.has(cellId)) return
+                cellsToDelete.add(cellId)
+
+                // Find children (cells where parent === cellId)
+                const children = root.querySelectorAll(
+                    `mxCell[parent="${cellId}"]`,
+                )
+                children.forEach((child) => {
+                    const childId = child.getAttribute("id")
+                    if (childId && childId !== "0" && childId !== "1") {
+                        collectDescendants(childId)
+                    }
+                })
+            }
+
+            // Collect the target cell and all its descendants
+            collectDescendants(op.cell_id)
+
+            // Find edges referencing any of the cells to be deleted
+            // Also recursively collect children of those edges (e.g., edge labels)
+            for (const cellId of cellsToDelete) {
+                const referencingEdges = root.querySelectorAll(
+                    `mxCell[source="${cellId}"], mxCell[target="${cellId}"]`,
+                )
+                referencingEdges.forEach((edge) => {
+                    const edgeId = edge.getAttribute("id")
+                    // Protect root cells from being added via edge references
+                    if (edgeId && edgeId !== "0" && edgeId !== "1") {
+                        // Recurse to collect edge's children (like labels)
+                        collectDescendants(edgeId)
+                    }
+                })
+            }
+
+            // Log what will be deleted
+            if (cellsToDelete.size > 1) {
+                console.log(
+                    `[applyDiagramOperations] Cascade delete "${op.cell_id}" → deleting ${cellsToDelete.size} cells: ${Array.from(cellsToDelete).join(", ")}`,
                 )
             }
 
-            // Remove the node
+            // Delete all collected cells
-            existingCell.parentNode?.removeChild(existingCell)
+            for (const cellId of cellsToDelete) {
-            cellMap.delete(op.cell_id)
+                const cell = cellMap.get(cellId)
+                if (cell) {
+                    cell.parentNode?.removeChild(cell)
+                    cellMap.delete(cellId)
+                }
+            }
         }
     }
 

packages/mcp-server/src/index.ts

@@ -78,7 +78,7 @@ server.prompt(
 
 ## Creating a New Diagram
 1. Call start_session to open the browser preview
-2. Use display_diagram with complete mxGraphModel XML to create a new diagram
+2. Use create_new_diagram with complete mxGraphModel XML to create a new diagram
 
 ## Adding Elements to Existing Diagram
 1. Use edit_diagram with "add" operation
@@ -91,7 +91,7 @@ server.prompt(
 3. For update, provide the cell_id and complete new mxCell XML
 
 ## Important Notes
-- display_diagram REPLACES the entire diagram - only use for new diagrams
+- create_new_diagram REPLACES the entire diagram - only use for new diagrams
 - edit_diagram PRESERVES user's manual changes (fetches browser state first)
 - Always use unique cell_ids when adding elements (e.g., "shape-1", "arrow-2")`,
                 },
@@ -150,19 +150,59 @@ server.registerTool(
     },
 )
 
-// Tool: display_diagram
+// Tool: create_new_diagram
 server.registerTool(
-    "display_diagram",
+    "create_new_diagram",
     {
-        description:
+        description: `Create a NEW diagram from mxGraphModel XML. Use this when creating a diagram from scratch or replacing the current diagram entirely.
-            "Display a NEW draw.io diagram from XML. REPLACES the entire diagram. " +
+
-            "Use this for creating new diagrams from scratch. " +
+CRITICAL: You MUST provide the 'xml' argument in EVERY call. Do NOT call this tool without xml.
-            "To ADD elements to an existing diagram, use edit_diagram with 'add' operation instead. " +
+
-            "You should generate valid draw.io/mxGraph XML format.",
+When to use this tool:
+- Creating a new diagram from scratch
+- Replacing the current diagram with a completely different one
+- Major structural changes that require regenerating the diagram
+
+When to use edit_diagram instead:
+- Small modifications to existing diagram
+- Adding/removing individual elements
+- Changing labels, colors, or positions
+
+XML FORMAT - Full mxGraphModel structure:
+<mxGraphModel>
+  <root>
+    <mxCell id="0"/>
+    <mxCell id="1" parent="0"/>
+    <mxCell id="2" value="Shape" style="rounded=1;" vertex="1" parent="1">
+      <mxGeometry x="100" y="100" width="120" height="60" as="geometry"/>
+    </mxCell>
+  </root>
+</mxGraphModel>
+
+LAYOUT CONSTRAINTS:
+- Keep all elements within x=0-800, y=0-600 (single page viewport)
+- Start from margins (x=40, y=40), keep elements grouped closely
+- Use unique IDs starting from "2" (0 and 1 are reserved)
+- Set parent="1" for top-level shapes
+- Space shapes 150-200px apart for clear edge routing
+
+EDGE ROUTING RULES:
+- Never let multiple edges share the same path - use different exitY/entryY values
+- For bidirectional connections (A↔B), use OPPOSITE sides
+- Always specify exitX, exitY, entryX, entryY explicitly in edge style
+- Route edges AROUND obstacles using waypoints (add 20-30px clearance)
+- Use natural connection points based on flow (not corners)
+
+COMMON STYLES:
+- Shapes: rounded=1; fillColor=#hex; strokeColor=#hex
+- Edges: endArrow=classic; edgeStyle=orthogonalEdgeStyle; curved=1
+- Text: fontSize=14; fontStyle=1 (bold); align=center`,
         inputSchema: {
             xml: z
                 .string()
-                .describe("The draw.io XML to display (mxGraphModel format)"),
+                .describe(
+                    "REQUIRED: The complete mxGraphModel XML. Must always be provided.",
+                ),
         },
     },
     async ({ xml: inputXml }) => {
@@ -199,7 +239,7 @@ server.registerTool(
                 }
             }
 
-            log.info(`Displaying diagram, ${xml.length} chars`)
+            log.info(`Setting diagram content, ${xml.length} chars`)
 
             // Sync from browser state first
             const browserState = getState(currentSession.id)
@@ -226,20 +266,20 @@ server.registerTool(
             // Save AI result (no SVG yet - will be captured by browser)
             addHistory(currentSession.id, xml, "")
 
-            log.info(`Diagram displayed successfully`)
+            log.info(`Diagram content set successfully`)
 
             return {
                 content: [
                     {
                         type: "text",
-                        text: `Diagram displayed successfully!\n\nThe diagram is now visible in your browser.\n\nXML length: ${xml.length} characters`,
+                        text: `Diagram content set successfully!\n\nThe diagram is now visible in your browser.\n\nXML length: ${xml.length} characters`,
                     },
                 ],
             }
         } catch (error) {
             const message =
                 error instanceof Error ? error.message : String(error)
-            log.error("display_diagram failed:", message)
+            log.error("create_new_diagram failed:", message)
             return {
                 content: [{ type: "text", text: `Error: ${message}` }],
                 isError: true,
@@ -340,7 +380,7 @@ server.registerTool(
                     content: [
                         {
                             type: "text",
-                            text: "Error: No diagram to edit. Please create a diagram first with display_diagram.",
+                            text: "Error: No diagram to edit. Please create a diagram first with create_new_diagram.",
                         },
                     ],
                     isError: true,
@@ -474,7 +514,7 @@ server.registerTool(
                     content: [
                         {
                             type: "text",
-                            text: "No diagram exists yet. Use display_diagram to create one.",
+                            text: "No diagram exists yet. Use create_new_diagram to create one.",
                         },
                     ],
                 }

proxy.ts

@@ -1,63 +0,0 @@
-import { match as matchLocale } from "@formatjs/intl-localematcher"
-import Negotiator from "negotiator"
-import type { NextRequest } from "next/server"
-import { NextResponse } from "next/server"
-import { i18n } from "./lib/i18n/config"
-
-function getLocale(request: NextRequest): string | undefined {
-    // Negotiator expects plain object so we need to transform headers
-    const negotiatorHeaders: Record<string, string> = {}
-    request.headers.forEach((value, key) => {
-        negotiatorHeaders[key] = value
-    })
-
-    // @ts-expect-error locales are readonly
-    const locales: string[] = i18n.locales
-
-    // Use negotiator and intl-localematcher to get best locale
-    const languages = new Negotiator({ headers: negotiatorHeaders }).languages(
-        locales,
-    )
-
-    const locale = matchLocale(languages, locales, i18n.defaultLocale)
-
-    return locale
-}
-
-export function proxy(request: NextRequest) {
-    const pathname = request.nextUrl.pathname
-
-    // Skip API routes, static files, and Next.js internals
-    if (
-        pathname.startsWith("/api/") ||
-        pathname.startsWith("/_next/") ||
-        pathname.includes("/favicon") ||
-        /\.(.*)$/.test(pathname)
-    ) {
-        return
-    }
-
-    // Check if there is any supported locale in the pathname
-    const pathnameIsMissingLocale = i18n.locales.every(
-        (locale) =>
-            !pathname.startsWith(`/${locale}/`) && pathname !== `/${locale}`,
-    )
-
-    // Redirect if there is no locale
-    if (pathnameIsMissingLocale) {
-        const locale = getLocale(request)
-
-        // Redirect to localized path
-        return NextResponse.redirect(
-            new URL(
-                `/${locale}${pathname.startsWith("/") ? "" : "/"}${pathname}`,
-                request.url,
-            ),
-        )
-    }
-}
-
-export const config = {
-    // Matcher ignoring `/_next/` and `/api/`
-    matcher: ["/((?!api|_next/static|_next/image|favicon.ico).*)"],
-}

tsconfig.json

@@ -22,6 +22,7 @@
             "@/*": ["./*"]
         }
     },
+    "files": ["electron/electron.d.ts"],
     "include": [
         "next-env.d.ts",
         "**/*.ts",