When: the AI has just come back from a reset, or you are not sure it still has the right picture.
Built from: the context window, and the fact that a summary made from inside a window is only as good as that window.
Ask it to give a summary of its understanding of the current situation, including what the objectives are. Read it. Correct anything that is off, until what it thinks it is doing matches what you expect. Only then let the work carry on.
As a skill: ask the AI to turn this page into a skill, and run it after every compact or restart.