WebSocket Transport for MCP Servers

What: Configure MCP servers to use WebSocket connections directly

How to use:

{
  "mcpServers": {
    "my-server": {
      "type": "ws",
      "url": "ws://localhost:8080",
      "headers": {
        "Authorization": "Bearer token123"
      }
    }
  }
}

Details:

• Previously WebSocket was only available for internal IDE communication
• Now supports custom headers and authentication
• Complements existing stdio, SSE, and HTTP transports
• Evidence: F56 schema at line 388759, transport enum updated at line 388727