diff --git a/src/generated/schema.json b/src/generated/schema.json
index 6895edc..fed9bb7 100644
--- a/src/generated/schema.json
+++ b/src/generated/schema.json
@@ -330,6 +330,10 @@
                         "type": "string",
                         "const": "--color-text-inverse"
                       },
+                      {
+                        "type": "string",
+                        "const": "--color-text-ghost"
+                      },
                       {
                         "type": "string",
                         "const": "--color-text-info"
@@ -634,19 +638,39 @@
               "properties": {
                 "width": {
                   "description": "Viewport width in pixels (if fixed). Only pass width or maxWidth, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "height": {
                   "description": "Viewport height in pixels (if fixed). Only pass height or maxHeight, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "maxWidth": {
                   "description": "Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "maxHeight": {
                   "description": "Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 }
               },
               "additionalProperties": false
@@ -955,6 +979,10 @@
                     "type": "string",
                     "const": "--color-text-inverse"
                   },
+                  {
+                    "type": "string",
+                    "const": "--color-text-ghost"
+                  },
                   {
                     "type": "string",
                     "const": "--color-text-info"
@@ -1259,19 +1287,39 @@
           "properties": {
             "width": {
               "description": "Viewport width in pixels (if fixed). Only pass width or maxWidth, not both.",
-              "type": "number"
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {}
+              ]
             },
             "height": {
               "description": "Viewport height in pixels (if fixed). Only pass height or maxHeight, not both.",
-              "type": "number"
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {}
+              ]
             },
             "maxWidth": {
               "description": "Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.",
-              "type": "number"
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {}
+              ]
             },
             "maxHeight": {
               "description": "Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both.",
-              "type": "number"
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {}
+              ]
             }
           },
           "additionalProperties": false
@@ -1424,6 +1472,10 @@
                 "type": "string",
                 "const": "--color-text-inverse"
               },
+              {
+                "type": "string",
+                "const": "--color-text-ghost"
+              },
               {
                 "type": "string",
                 "const": "--color-text-info"
@@ -2113,6 +2165,10 @@
                         "type": "string",
                         "const": "--color-text-inverse"
                       },
+                      {
+                        "type": "string",
+                        "const": "--color-text-ghost"
+                      },
                       {
                         "type": "string",
                         "const": "--color-text-info"
@@ -2417,19 +2473,39 @@
               "properties": {
                 "width": {
                   "description": "Viewport width in pixels (if fixed). Only pass width or maxWidth, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "height": {
                   "description": "Viewport height in pixels (if fixed). Only pass height or maxHeight, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "maxWidth": {
                   "description": "Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 },
                 "maxHeight": {
                   "description": "Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both.",
-                  "type": "number"
+                  "anyOf": [
+                    {
+                      "type": "number"
+                    },
+                    {}
+                  ]
                 }
               },
               "additionalProperties": false
@@ -3207,6 +3283,10 @@
           "type": "string",
           "const": "--color-text-inverse"
         },
+        {
+          "type": "string",
+          "const": "--color-text-ghost"
+        },
         {
           "type": "string",
           "const": "--color-text-info"
@@ -3520,6 +3600,10 @@
             "type": "string",
             "const": "--color-text-inverse"
           },
+          {
+            "type": "string",
+            "const": "--color-text-ghost"
+          },
           {
             "type": "string",
             "const": "--color-text-info"
diff --git a/src/generated/schema.ts b/src/generated/schema.ts
index 2c73ad6..16c0895 100644
--- a/src/generated/schema.ts
+++ b/src/generated/schema.ts
@@ -43,6 +43,7 @@ export const McpUiStyleVariableKeySchema = z
     z.literal("--color-text-secondary"),
     z.literal("--color-text-tertiary"),
     z.literal("--color-text-inverse"),
+    z.literal("--color-text-ghost"),
     z.literal("--color-text-info"),
     z.literal("--color-text-danger"),
     z.literal("--color-text-success"),
@@ -567,28 +568,28 @@ export const McpUiHostContextSchema = z.looseObject({
     .object({
       /** @description Viewport width in pixels (if fixed). Only pass width or maxWidth, not both. */
       width: z
-        .number()
+        .union([z.number(), z.undefined()])
         .optional()
         .describe(
           "Viewport width in pixels (if fixed). Only pass width or maxWidth, not both.",
         ),
       /** @description Viewport height in pixels (if fixed). Only pass height or maxHeight, not both. */
       height: z
-        .number()
+        .union([z.number(), z.undefined()])
         .optional()
         .describe(
           "Viewport height in pixels (if fixed). Only pass height or maxHeight, not both.",
         ),
       /** @description Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.*/
       maxWidth: z
-        .number()
+        .union([z.number(), z.undefined()])
         .optional()
         .describe(
           "Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.",
         ),
       /** @description Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both. */
       maxHeight: z
-        .number()
+        .union([z.number(), z.undefined()])
         .optional()
         .describe(
           "Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both.",
diff --git a/src/spec.types.ts b/src/spec.types.ts
index 8f04e7e..1d03819 100644
--- a/src/spec.types.ts
+++ b/src/spec.types.ts
@@ -56,6 +56,7 @@ export type McpUiStyleVariableKey =
   | "--color-text-secondary"
   | "--color-text-tertiary"
   | "--color-text-inverse"
+  | "--color-text-ghost"
   | "--color-text-info"
   | "--color-text-danger"
   | "--color-text-success"
@@ -327,13 +328,13 @@ export interface McpUiHostContext {
   /** @description Current and maximum dimensions available to the UI. */
   viewport?: {
     /** @description Viewport width in pixels (if fixed). Only pass width or maxWidth, not both. */
-    width?: number;
+    width?: number | undefined;
     /** @description Viewport height in pixels (if fixed). Only pass height or maxHeight, not both. */
-    height?: number;
+    height?: number | undefined;
     /** @description Maximum available viewport width in pixels (if constrained). Only pass width or maxWidth, not both.*/
-    maxWidth?: number;
+    maxWidth?: number | undefined;
     /** @description Maximum available viewport height in pixels (if constrained). Only pass height or maxHeight, not both. */
-    maxHeight?: number;
+    maxHeight?: number | undefined;
   };
   /** @description User's language and region preference in BCP 47 format. */
   locale?: string;