On of the most popular is context7: https://context7.com/
In VS Code
In settings.json, find the mcp object. There, serverscan be added. Once added, mention the server in Agent Mode with “use context7” at the end of your prompt.
Insiders
Best is to use VS Code insiders. Make sure to start insiders from your CLI, otherwise it might have issues running NPX for installing certain MCP servers: code-insiders .