Update README.md

Clarify how to show the Vision tool only to administrators.

packages/@sanity/vision/README.md

@@ -2,16 +2,16 @@
 
 Vision is a plugin for Sanity Studio for testing GROQ queries. It features:
 
-- GROQ syntax highlighting so that the query is easier to read.
-- Parsed response that's more convenient to navigate and explore.
-- Switch between datasets
+- GROQ syntax highlighting so that the query is easier to read
+- Parsed response that's more convenient to navigate and explore
+- Switching between datasets
 - Listening for real-time updates
 
 ![Screenshot](assets/screenshot.png)
 
 ## Installation
 
-`npm install --save-exact @sanity/vision@dev-preview`
+`npm install --save-exact @sanity/vision`
 
 ### Configuring
 
@@ -34,7 +34,7 @@ export default defineConfig({
 
 ### Only enabling it for development
 
-If you only want the tool available in development (eg not in deployed studios), you can import and use the `isDev` constant from the `sanity` package:
+If you only want the Vision tool available in development (e.g., not in deployed studios), you can import and use the `isDev` constant from the `sanity` package:
 
 ```ts
 // `sanity.config.ts` / `sanity.config.js`:
@@ -52,6 +52,31 @@ export default defineConfig({
 })
 ```
 
+### Only enabling it for administrators
+
+If you only want the Vision tool available to administrators, you can use the [Tool API](https://www.sanity.io/docs/studio-tools) to filter out the tool based on role:
+
+```ts
+// `sanity.config.ts` / `sanity.config.js`:
+import {defineConfig} from 'sanity'
+import {visionTool} from '@sanity/vision'
+
+export default defineConfig({
+  // ... name, title, projectId, dataset, etc.
+  plugins: [
+    // ... your other plugins here ...
+    visionTool(),
+  ],
+  tools: (prev, {currentUser}) => {
+    const isAdmin = currentUser?.roles.some(role => role.name === 'administrator');
+
+    // If the user has the administrator role, return all tools.
+    // If the user does not have the administrator role, filter out the vision tool.
+    return isAdmin ? prev : prev.filter(tool => tool.name !== 'vision');
+  },
+})
+```
+
 ## License
 
 MIT-licensed. See LICENSE.