Planned first.
Checked last.
Before anything renders, Claude writes a beat sheet: what you say, what shows on screen, and where every number or screenshot comes from. You say go. After the render it checks the finished file: every cut, flash frames, a word clipped at a cut, captions clear of Instagram’s buttons, and the sound level. It fixes what it finds before you see it.
Any number or screenshot on screen needs a source you gave it.