Authenticate MCP tool discovery with an API key API key authentication is now supported for the Model Context Protocol (MCP) tools/list method

## Feature Feature **Authenticate MCP tool discovery with an API key** API key authentication is now supported for the Model Context Protocol (MCP) `tools/list` method. You can name an API key security scheme in `tools-list.security`, in addition to a JWT security scheme. For more information, see [Configure Model Context Protocol](https://cloud.google.com/api-gateway/docs/mcp-configure).