Previous value: -"Room ID. If not provided, creates a new canvas. Extract from URLs as ?room=[room_id] or /gdrive?id=[room_id]."New value: +"Room ID of an existing canvas to add to. If the user is continuing a canvas already referenced in this conversation (by room_id, or a URL like ?room=[room_id] or /gdrive?id=[room_id]), pass it here. Omit to create a new canvas."

Previous value: -"Per-type required fields: rectangle/ellipse/diamond → x, y (width/height default to 100). text → x, y, text (width/height auto-sized; omit or set to 0). arrow/line → x, y, points (e.g. [[0,0],[100,0]]); optionally startBinding/endBinding instead of points. image → x, y, width, height, fileId. freedraw → x, y, points. type is inferred from fields if omitted (text field → text, points → line, fileId → image, else rectangle)."New value: +"Per-type required fields: rectangle/ellipse/diamond → x, y (width/height default to 100). text → x, y, text (width/height auto-sized; omit or set to 0). rectangle/ellipse/diamond may also include text, which creates a bound label. arrow/line → x, y, points (e.g. [[0,0],[100,0]]); optionally startBinding/endBinding instead of points. image → x, y, width, height, fileId. freedraw → x, y, points. type is inferred from fields if omitted (text field → text, points → line, fileId → image, else rectangle)."

Previous value: -"Text content. Required for type=text. Also used as arrow label when set on an arrow."New value: +"Text content. Required for type=text. For text elements and rectangle/ellipse/diamond shape labels, Supports the rich-text plugin HTML subset: <b>/<strong>, <i>/<em>, <u>, <br>, <div>/<p>, <ul>/<ol>/<li>, <a href>, <font color>, and <span style=\"color, background/background-color, font-size, font-family\">. Use textAlign for left/center/right alignment; avoid unsupported HTML/CSS. Also used as arrow label when set on an arrow."

Added value: +{
+  "description": "Room ID. If not provided, creates a new canvas. Extract from URLs as ?room=[room_id] or /gdrive?id=[room_id].",
+  "type": "string"
+}

Removed value: -{
-  "description": "Room URL or ID. If not provided, creates a new canvas",
-  "type": "string"
-}

Added value: +{
+  "description": "Canvas room ID",
+  "type": "string"
+}

Added value: +"Per-type required fields: rectangle/ellipse/diamond → x, y (width/height default to 100). text → x, y, text (width/height auto-sized; omit or set to 0). arrow/line → x, y, points (e.g. [[0,0],[100,0]]); optionally startBinding/endBinding instead of points. image → x, y, width, height, fileId. freedraw → x, y, points. type is inferred from fields if omitted (text field → text, points → line, fileId → image, else rectangle)."

Previous value: -"Container element ID (for text bound to shapes). Set x,y to 0,0 for auto-centering"New value: +"For type=text: ID of the shape this text is bound to. Set x,y to 0,0 for auto-centering inside the shape."

Previous value: -"For arrows: bind end point to a shape."New value: +"For type=arrow: binds the arrow end to a shape. Use instead of or alongside points."

Added value: +[
+  "elementId",
+  "focus",
+  "gap"
+]

Previous value: -"Font family: 5=Excalifont, 6=Nunito, 7=Lilita One, 8=Comic Shanns (default: 5)"New value: +"Font family: 5=Excalifont, 6=Nunito, 7=Lilita One, 8=Comic Shanns (default: 5). Applies to text elements."

Previous value: -"Font size (default: 20)"New value: +"Font size (default: 20). Applies to text elements."

Previous value: -"Height (default: 100)"New value: +"Height (default: 100; omit for text — auto-sized)"

Previous value: -"For arrows: text label displayed on the arrow"New value: +"For type=arrow: text label displayed on the arrow"

Previous value: -"Points array for arrows/lines. Relative to element x,y. Example: [[0,0],[0,100]] for vertical arrow"New value: +"Required for arrow/line/freedraw. Coordinates relative to element x,y. Example: [[0,0],[100,0]] for horizontal arrow."

Previous value: -"For arrows: bind start point to a shape."New value: +"For type=arrow: binds the arrow start to a shape. Use instead of or alongside points."

Added value: +[
+  "elementId",
+  "focus",
+  "gap"
+]

Previous value: -"Text content (for text elements)"New value: +"Text content. Required for type=text. Also used as arrow label when set on an arrow."

Previous value: -"Element type (e.g. rectangle, ellipse, diamond, arrow, line, freedraw, text, image)"New value: +"Element type. Inferred from fields if omitted: text field → text, points → line, fileId → image, else rectangle."

Added value: +[
+  "rectangle",
+  "ellipse",
+  "diamond",
+  "arrow",
+  "line",
+  "freedraw",
+  "text",
+  "image"
+]

Previous value: -"Width (default: 100)"New value: +"Width (default: 100; omit for text — auto-sized)"

Previous value: -"X coordinate"New value: +"X coordinate (defaults to 0 if omitted)"

Previous value: -"Y coordinate"New value: +"Y coordinate (defaults to 0 if omitted)"

Previous value: -[
-  "type",
-  "x",
-  "y"
-]New value: +[
+  "x",
+  "y"
+]

Added value: +true

Previous value: -"Current app state (viewBackgroundColor, etc.)"New value: +"Canvas app state (viewBackgroundColor, etc.)"

Added value: +{
+  "viewBackgroundColor": {
+    "type": "string"
+  }
+}

Previous value: -"Current scene elements for inline SVG rendering"New value: +"All elements currently on the canvas"

Added value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

Removed value: -{
-  "description": "Mermaid definition to be rendered client-side",
-  "type": "object"
-}

Added value: +[
+  "url",
+  "isNew",
+  "collabUrl",
+  "elements",
+  "appState"
+]

Previous value: -"For arrows: bind end point to a shape. REQUIRED for connected diagrams!"New value: +"For arrows: bind end point to a shape."

Removed value: -"ID of shape to connect to (REQUIRED)"

Removed value: -"Position on edge: -1 to 1, 0=center (REQUIRED, use 0)"

Removed value: -"Gap from shape edge in pixels (REQUIRED, use 8)"

Removed value: -[
-  "elementId",
-  "focus",
-  "gap"
-]

Removed value: -{
-  "description": "Lock element (default: false)",
-  "type": "boolean"
-}

Previous value: -"For arrows: bind start point to a shape. REQUIRED for connected diagrams!"New value: +"For arrows: bind start point to a shape."

Removed value: -"ID of shape to connect to (REQUIRED)"

Removed value: -"Position on edge: -1 to 1, 0=center (REQUIRED, use 0)"

Removed value: -"Gap from shape edge in pixels (REQUIRED, use 8)"

Removed value: -[
-  "elementId",
-  "focus",
-  "gap"
-]

Previous value: -"Element type"New value: +"Element type (e.g. rectangle, ellipse, diamond, arrow, line, freedraw, text, image)"

Removed value: -[
-  "rectangle",
-  "ellipse",
-  "diamond",
-  "arrow",
-  "line",
-  "freedraw",
-  "text",
-  "image"
-]

Removed value: -{
-  "default": 3600,
-  "description": "Room lifetime in seconds (default: 3600, max: 86400). Only used when creating new canvas",
-  "type": "number"
-}

Previous value: -"Position on edge: -1 to 1, 0=center (default: 0)"New value: +"Position on edge: -1 to 1, 0=center (REQUIRED, use 0)"

Previous value: -"Gap from shape edge in pixels (default: 8)"New value: +"Gap from shape edge in pixels (REQUIRED, use 8)"

Added value: +[
+  "elementId",
+  "focus",
+  "gap"
+]

Previous value: -"Position on edge: -1 to 1, 0=center (default: 0)"New value: +"Position on edge: -1 to 1, 0=center (REQUIRED, use 0)"

Previous value: -"Gap from shape edge in pixels (default: 8)"New value: +"Gap from shape edge in pixels (REQUIRED, use 8)"

Added value: +[
+  "elementId",
+  "focus",
+  "gap"
+]

Previous value: -"Font family: 1=Virgil, 2=Helvetica, 3=Cascadia (default: 1)"New value: +"Font family: 5=Excalifont, 6=Nunito, 7=Lilita One, 8=Comic Shanns (default: 5)"

Added value: +{
+  "description": "Current app state (viewBackgroundColor, etc.)",
+  "type": "object"
+}

Added value: +{
+  "description": "Collaboration server URL for Socket.IO",
+  "type": "string"
+}

Added value: +{
+  "description": "Current scene elements for inline SVG rendering",
+  "type": "array"
+}

Added value: +{
+  "description": "Mermaid definition to be rendered client-side",
+  "type": "object"
+}