diff --git a/src/generated/schema.json b/src/generated/schema.json
index 995eb4dd..5143214a 100644
--- a/src/generated/schema.json
+++ b/src/generated/schema.json
@@ -4047,7 +4047,6 @@
           }
         }
       },
-      "required": ["resourceUri"],
       "additionalProperties": false
     },
     "McpUiToolResultNotification": {
diff --git a/src/generated/schema.ts b/src/generated/schema.ts
index bc415e51..bd94075e 100644
--- a/src/generated/schema.ts
+++ b/src/generated/schema.ts
@@ -484,12 +484,12 @@ export const McpUiToolVisibilitySchema = z
  */
 export const McpUiToolMetaSchema = z.object({
   /**
-   * URI of the UI resource to display for this tool.
+   * URI of the UI resource to display for this tool, if any.
    * This is converted to `_meta["ui/resourceUri"]`.
    *
    * @example "ui://weather/widget.html"
    */
-  resourceUri: z.string(),
+  resourceUri: z.string().optional(),
   /**
    * @description Who can access this tool. Default: ["model", "app"]
    * - "model": Tool visible to and callable by the agent
diff --git a/src/spec.types.ts b/src/spec.types.ts
index 5b7135ba..a060bfa0 100644
--- a/src/spec.types.ts
+++ b/src/spec.types.ts
@@ -549,12 +549,12 @@ export type McpUiToolVisibility = "model" | "app";
  */
 export interface McpUiToolMeta {
   /**
-   * URI of the UI resource to display for this tool.
+   * URI of the UI resource to display for this tool, if any.
    * This is converted to `_meta["ui/resourceUri"]`.
    *
    * @example "ui://weather/widget.html"
    */
-  resourceUri: string;
+  resourceUri?: string;
   /**
    * @description Who can access this tool. Default: ["model", "app"]
    * - "model": Tool visible to and callable by the agent