Previous value: -nullNew value: +{
+  "properties": {
+    "earlierBefore": {
+      "description": "Pass as before for the page of older messages; null when there are none",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "earlierCount": {
+      "description": "Messages older than this page",
+      "type": "number"
+    },
+    "messages": {
+      "description": "Oldest first within the page",
+      "items": {
+        "properties": {
+          "approval": {
+            "properties": {
+              "detail": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "kind": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "reviewUrl": {
+                "type": "string"
+              },
+              "status": {
+                "description": "pending, approved, or rejected",
+                "type": "string"
+              },
+              "summary": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "status"
+            ],
+            "type": "object"
+          },
+          "artifact": {
+            "properties": {
+              "id": {
+                "type": "string"
+              },
+              "type": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "type"
+            ],
+            "type": "object"
+          },
+          "connect": {
+            "properties": {
+              "detail": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "slot": {
+                "type": "string"
+              },
+              "summary": {
+                "type": "string"
+              },
+              "url": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "createdAt": {
+            "description": "ISO 8601",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "error": {
+            "type": "string"
+          },
+          "id": {
+            "description": "Message id; for a pending approval, the messageId arc_approve takes",
+            "type": "string"
+          },
+          "role": {
+            "description": "user, assistant, or tool",
+            "type": "string"
+          },
+          "text": {
+            "type": "string"
+          },
+          "tools": {
+            "items": {
+              "properties": {
+                "isError": {
+                  "type": "boolean"
+                },
+                "label": {
+                  "type": "string"
+                },
+                "name": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "type": "array"
+          }
+        },
+        "required": [
+          "id",
+          "role"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "thread": {
+      "properties": {
+        "id": {
+          "description": "Thread id",
+          "type": "string"
+        },
+        "lastMessageAt": {
+          "description": "ISO 8601",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "origin": {
+          "description": "Where the thread was started",
+          "type": "string"
+        },
+        "running": {
+          "description": "True while Ranla is still working on a turn",
+          "type": "boolean"
+        },
+        "scope": {
+          "description": "Desk the thread belongs to",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "title": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "id"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "thread",
+    "messages"
+  ],
+  "type": "object"
+}