feat: reference customize tools in other guides

Author: samuv

docs/toolhive/guides-ui/group-management.mdx

@@ -132,6 +132,18 @@ You cannot delete the `default` group.
 4. Use a different client or manually configure clients to access the
    "production" group when needed.
 
+### Create environment-specific tool sets
+
+If you're running the same MCP server in different groups for different
+environments:
+
+1. Copy the server to multiple groups (see
+   [Copy a server to a different group](#copy-a-server-to-a-different-group)).
+2. Customize tools in each group to match the environment's needs (see
+   [Customize tools](./customize-tools.mdx)).
+3. For example, enable only read-only tools in a production group, while
+   allowing all tools in a development group.
+
 ### Project-based organization
 
 1. Create groups for each project: "webapp-frontend", "webapp-backend", and

docs/toolhive/guides-ui/playground.mdx

@@ -72,6 +72,15 @@ To start using the playground:
 - The `toolhive mcp` server is included by default, providing management
   capabilities
 
+:::tip
+
+For more control over tool availability, use
+[Customize tools](./customize-tools.mdx) to permanently configure which tools
+are enabled for each registry server. The playground tool selection is temporary
+and only affects your testing session.
+
+:::
+
 4. **Start testing**: Begin chatting with your chosen AI model. The model will
    have access to all enabled MCP tools and can execute them based on your
    requests.

docs/toolhive/guides-ui/registry.mdx

@@ -86,6 +86,8 @@ After exploring the registry and finding servers you want to use:
 
 - **Install servers**: Click on servers from the registry to install and
   configure them for your environment
+- **Customize tools**: Selectively enable or disable tools from installed
+  registry servers to create focused tool sets
 - **Manage running servers**: Use the **MCP Servers** section to start, stop,
   and monitor your installed servers
 - **Create custom registries**: Set up your own private registry for

docs/toolhive/guides-ui/run-mcp-servers.mdx

@@ -487,6 +487,8 @@ automatically the next time you launch the application.
 
 - Connect ToolHive to AI clients like GitHub Copilot or Cursor using the
   [client configuration guide](./client-configuration.mdx).
+- Customize which tools are available from registry servers using the
+  [customize tools guide](./customize-tools.mdx).
 - Learn more about [secrets management](./secrets-management.mdx) to securely
   manage API tokens and other sensitive data.
 - Test your MCP servers using the [playground](./playground.mdx) to validate