Added value: +{
+  "description": "Present once an item of data.checklist is checked: ticks[] of {index, checked_at, checked_by.display_name}. A checked item stays checked.",
+  "type": "object"
+}

Previous value: -"A short checklist the room can tick through, e.g. a shopping list. Ticks are kept on each viewer's device, not shared."New value: +"A short checklist the room can tick through, e.g. a shopping list. The room ticks it together: a checked item is checked for everyone, cannot be unchecked, and alerts the other recipients."

Previous value: -"Arbitrary structured context (max 25 keys / 8KB). Read surfaces return it after connector privacy filtering; do not put secrets in data. data.location is reserved for a shareable location, and data.url + data.button_label are reserved for a tappable link ping."New value: +"Arbitrary structured context (max 25 keys / 8KB). Read surfaces return it after connector privacy filtering; do not put secrets in data. data.location is reserved for a shareable location, data.checklist for a checklist, and data.url + data.button_label are reserved for a tappable link ping."

Added value: +{
+  "additionalProperties": false,
+  "description": "A short checklist the room can tick through, e.g. a shopping list. Ticks are kept on each viewer's device, not shared.",
+  "properties": {
+    "items": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "text": {
+            "description": "One checklist item.",
+            "maxLength": 80,
+            "minLength": 1,
+            "type": "string"
+          }
+        },
+        "required": [
+          "text"
+        ],
+        "type": "object"
+      },
+      "maxItems": 25,
+      "minItems": 1,
+      "type": "array"
+    }
+  },
+  "required": [
+    "items"
+  ],
+  "type": "object"
+}

Previous value: -"Deliver time-sensitive so the ping breaks through Focus / Do Not Disturb. Independent of requires_ack: urgent affects delivery only and asks nothing of the recipient."New value: +"Deliver time-sensitive so the ping breaks through Focus / Do Not Disturb and reaches members who muted the room or you (a block still wins). Independent of requires_ack: urgent affects delivery only and asks nothing of the recipient."

Previous value: -4New value: +16

Added value: +{
+  "description": "With requires_ack: any (default) resolves on the first confirmation; all waits for every original eligible recipient. Read action_state.confirmed_count and required_count for progress.",
+  "enum": [
+    "any",
+    "all"
+  ],
+  "type": "string"
+}

Previous value: -"Keep this ping open until one eligible recipient acknowledges it, and show it as a lock-screen card with an Acknowledge button. Does not raise the interruption level on its own — combine with is_urgent for an ack that also breaks through Focus."New value: +"Keep this ping open until its confirmation rule is met, and show it as a lock-screen card with an Acknowledge button. Does not raise the interruption level on its own — combine with is_urgent for an ack that also breaks through Focus."

Added value: +{
+  "description": "Present when a connected agent originated the ping: its handle and display name.",
+  "type": "object"
+}