diff --git a/src/core/config-schema.json b/src/core/config-schema.json
index d39ba11..85be908 100644
--- a/src/core/config-schema.json
+++ b/src/core/config-schema.json
@@ -7,7 +7,8 @@
     "$schema": {
       "type": "string",
       "description": "Reference to the JSON schema",
-      "format": "uri"
+      "format": "uri",
+      "default": "https://raw.githubusercontent.com/persevie/grimoire-css/main/src/core/config-schema.json"
     },
     "variables": {
       "type": "object",
@@ -47,11 +48,13 @@
       "items": {
         "$ref": "#/definitions/GrimoireConfigCriticalJSON"
       }
+    },
+    "lock": {
+      "type": "boolean",
+      "description": "Optional flag indicating whether the GrimoireCSS configuration is locked"
     }
   },
-  "required": [
-    "projects"
-  ],
+  "required": ["projects"],
   "additionalProperties": false,
   "definitions": {
     "ScrollJSON": {
@@ -77,10 +80,7 @@
           }
         }
       },
-      "required": [
-        "name",
-        "spells"
-      ],
+      "required": ["name", "spells"],
       "additionalProperties": false
     },
     "ProjectJSON": {
@@ -101,24 +101,15 @@
           }
         },
         "outputDirPath": {
-          "type": [
-            "string",
-            "null"
-          ],
+          "type": ["string", "null"],
           "description": "Optional output directory path for the project's CSS"
         },
         "singleOutputFileName": {
-          "type": [
-            "string",
-            "null"
-          ],
+          "type": ["string", "null"],
           "description": "Optional file name for a single output file"
         }
       },
-      "required": [
-        "projectName",
-        "inputPaths"
-      ],
+      "required": ["projectName", "inputPaths"],
       "additionalProperties": false
     },
     "GrimoireConfigSharedJSON": {
@@ -144,9 +135,7 @@
           }
         }
       },
-      "required": [
-        "outputPath"
-      ],
+      "required": ["outputPath"],
       "additionalProperties": false
     },
     "GrimoireConfigCriticalJSON": {
@@ -176,9 +165,7 @@
           }
         }
       },
-      "required": [
-        "fileToInlinePaths"
-      ],
+      "required": ["fileToInlinePaths"],
       "additionalProperties": false
     },
     "CSSCustomPropertiesItemJSON": {
@@ -186,10 +173,7 @@
       "description": "Represents a custom CSS property item, including associated variables",
       "properties": {
         "element": {
-          "type": [
-            "string",
-            "null"
-          ],
+          "type": ["string", "null"],
           "description": "Optional DOM element associated with the CSS variables (e.g., `tag`, `class`, `id`, `:root`)"
         },
         "dataParam": {
@@ -210,11 +194,7 @@
           }
         }
       },
-      "required": [
-        "dataParam",
-        "dataValue",
-        "cssVariables"
-      ],
+      "required": ["dataParam", "dataValue", "cssVariables"],
       "additionalProperties": false
     }
   }
diff --git a/src/core/config.rs b/src/core/config.rs
index 083f1bf..5fa2bb6 100644
--- a/src/core/config.rs
+++ b/src/core/config.rs
@@ -422,7 +422,7 @@ impl Config {
         });
 
         ConfigJSON {
-            schema: Some("".to_string()),
+            schema: Some("https://raw.githubusercontent.com/persevie/grimoire-css/main/src/core/config-schema.json".to_string()),
             variables: variables_hash_map,
             scrolls: Self::scrolls_to_json(self.scrolls.clone()),
             projects: Self::projects_to_json(self.projects.clone()),