I was able to get the official Penpot MCP server running locally and connected up to JetBrains Rider IDE with the Junie AI. I had issues with Junie reporting a repeated timeout when using the http://localhost:4401/mcp however dropping to http://localhost:4401/sse allowed Junie to use it and not time out.
In Rider (which I will assume the other IDEs using Junie will be similar)
Open Settings and find the Junie > MCP Settings
Edit the servers file:
{
"mcpServers": {
"penpot": {
"type": "http",
"url": "http://localhost:4401/sse"
}
}
}