@hacks4pancakes my company has a process and regulations for this, so you get management approval, all travel documents and authorizations (there’s nothing like claiming “nothing to declare” while carrying a laptop for of IP under export control…) and tax and social security. Even then, we have time limits based on geography (host and guest) specifically because of how national regulations do and do not overlap.
I guess if you’re used to right to work, you might as well do everything else with the same attitude, but your host country song your tax office are unlikely to know how to be chill.