Add instructions to enable MCP support

Author: ntrogh

docs/copilot/chat/mcp-servers.md

@@ -36,6 +36,13 @@ MCP's [official server repository](https://github.com/modelcontextprotocol/serve
 
 MCP is still a relatively new standard, and the ecosystem is rapidly evolving. As more developers adopt MCP, you can expect to see an increasing number of servers and tools available for integration with your projects.
 
+## Enable MCP support in VS Code
+
+> [!NOTE]
+> MCP support in agent mode in VS Code is currently in preview.
+
+MCP support is available starting in VS Code release 1.99. To enable MCP support in VS Code, enable the `setting(chat.mcp.enabled)` setting. This setting is enabled by default.
+
 ## Add an MCP server
 
 You have multiple options to add an MCP server in VS Code:

docs/copilot/reference/copilot-settings.md

@@ -47,6 +47,7 @@ The team is continuously working on improving Copilot in VS Code and adding new
 * `setting(chat.agent.enabled:true)`: Enable or disable agent mode (default: `false`, requires VS Code 1.99 or later)
 * `setting(chat.agent.maxRequests)`: Maximum number of requests that Copilot can make in agent mode (default: 15)
 * `setting(github.copilot.chat.agent.runTasks)`: Run workspace tasks when using agent mode (default: `true`)
+* `setting(chat.mcp.enabled)` _(Preview)_: Enable Model Context Protocol (MCP) support in VS Code. This enables adding tools from MCP servers in agent mode.
 * `setting(github.copilot.chat.codesearch.enabled)` _(Preview)_: When using `#codebase` in the prompt, Copilot automatically discovers relevant files to be edited.
 * `setting(chat.implicitContext.enabled)` _(Experimental)_: Configure if the active editor should be automatically added as context to the chat prompt.
 * `setting(github.copilot.chat.agent.thinkingTool:true)` _(Experimental)_: Enable the thinking tool in agent mode.