Is this tree safe?

Neither, you consult an expert - a squirrel!

 

Correct me if I'm wrong, but that looks like a typical spruce tree?
Their roots go massively deep, whereas pines keep roots on surface. In Nordic countries, during autumn storms if the ground has not frozen at times these beasts come down. They just tip. Pines are more commonly falling,but yes,even spruce trees collapse.
That said, I've never seen someone particularly worrying about it. It happens, same as at times meteors fall on roofs and lightning strikes us.
I'd check from the house insurance that I'm covered in case we ger super beast from east and let it live. The chances are it will outlive us all, but if it won't, you'll get a new annex.

I lived my childhood in bush, surrounded by these trees. They take massive beating, I would not worry about it