 Suppose you intend to visit the Taj Mahal tomorrow, and I intend to visit the Taj Mahal tomorrow. This does not make it the case that we intend to visit the Taj Mahal together. If I know about your plan, I may express (or refer to) our intention in the form “we intend to visit the Taj Mahal tomorrow”. But this does not imply anything collective about our intentions. Even if knowledge about our plan is common, mutual, or open between us, my intention and your intention may still be purely individual. For us to intend to visit the Taj Mahal together is something different.