diff --git a/schema/draft/schema.json b/schema/draft/schema.json
index 1f91ad46..211a8205 100644
--- a/schema/draft/schema.json
+++ b/schema/draft/schema.json
@@ -13,6 +13,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -37,6 +42,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -495,6 +505,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -597,6 +612,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -1532,6 +1552,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -1638,6 +1663,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
@@ -1974,6 +2004,11 @@
                             },
                             "type": "array"
                         },
+                        "lastModified": {
+                            "description": "The timestamp when the resource was last modified.\nExamples: last activity timestamp in an open file, timestamp when resource is attached, etc.\n\nShould be an ISO 8601 formatted string (e.g., \"2025-01-12T15:00:58Z\").",
+                            "format": "date-time",
+                            "type": "string"
+                        },
                         "priority": {
                             "description": "Describes how important this data is for operating the server.\n\nA value of 1 means \"most important,\" and indicates that the data is\neffectively required, while 0 means \"least important,\" and indicates that\nthe data is entirely optional.",
                             "maximum": 1,
diff --git a/schema/draft/schema.ts b/schema/draft/schema.ts
index 02070496..a5e37f5d 100644
--- a/schema/draft/schema.ts
+++ b/schema/draft/schema.ts
@@ -832,6 +832,14 @@ export interface Annotated {
      * @maximum 1
      */
     priority?: number;
+    
+    /**
+     * The timestamp when the resource was last modified.
+     * Examples: last activity timestamp in an open file, timestamp when resource is attached, etc.
+     * 
+     * Should be an ISO 8601 formatted string (e.g., "2025-01-12T15:00:58Z").
+     */
+    lastModified?: Date;
   }
 }