Describe the escape of water, not just the obstruction below.
Material in a gutter and a blocked working position are different concerns. Tell us whether water spills along the edge, near a corner or beside a pipe. Leaves and accumulated debris can restrict the route, while a damaged joint may leak separately. A shed beneath a channel does not explain its drainage condition.
Note any previous clearance and whether the current overflow developed afterwards. Fragments from the roof can gather with other debris, but roof cleaning is not part of the confirmed work. Safe observations from the ground are enough to start the discussion; do not move into an unsafe position for a better view.