diff --git a/telemetry/definitions/commonDefinitions.json b/telemetry/definitions/commonDefinitions.json
index a9bb58d81..618d0a79f 100644
--- a/telemetry/definitions/commonDefinitions.json
+++ b/telemetry/definitions/commonDefinitions.json
@@ -1096,6 +1096,11 @@
             "type": "boolean",
             "description": "True if the code snippet that user interacts with has a reference."
         },
+        {
+            "name": "cwsprChatHistoryMessageCharacterCount",
+            "type": "int",
+            "description": "The number of characters in a history message"
+        },
         {
             "name": "cwsprChatInteractionTarget",
             "type": "string",
@@ -2399,6 +2404,37 @@
                 }
             ]
         },
+        {
+            "name": "amazonq_addMessageHistory",
+            "description": "When a message is added to the history",
+            "metadata": [
+                {
+                    "type": "credentialStartUrl",
+                    "required": false
+                },
+                {
+                    "type": "cwsprChatConversationId"
+                },
+                {
+                    "type": "cwsprChatConversationType"
+                },
+                {
+                    "type": "cwsprChatHistoryMessageCharacterCount"
+                },
+                {
+                    "type": "cwsprChatMessageId",
+                    "required": false
+                },
+                {
+                    "type": "cwsprToolName",
+                    "required": false
+                },
+                {
+                    "type": "cwsprToolUseId",
+                    "required": false
+                }
+            ]
+        },
         {
             "name": "amazonq_approachInvoke",
             "description": "Captures Approach generation process",