Service used to be included and you just rounded up to nearest euro. Now half the places in Marais and Saint-Germain have tip options on card machines and I have no clue what's expected.

Asked my Airbnb host in République — She said 5-10% becoming normal at nicer bistros around Boulevard Saint-Germain, but traditional cafés and brasseries still don't expect beyond rounding to nearest euro.

Definitely not Jeff's opinion but maybe bring cash for tips so you're not awkwardly stabbing at card machine while waiter watches at Le Procope.