Docs state that all you have to do to run the server is:
...but without any info that it starts the server in stdio mode.
To run in sse mode you have to:
python src/server.py --transport sse
Then this part of docs works as intended inside the IDE:
{
"servers": {
"mariadb-mcp-server": {
"url": "http://{host}:9001/sse",
"type": "sse"
}
}
}