In the effort of achieving historical accuracy; I don't believe they'd be titled "Agents Reports"?
They'd more likely be released as part of straightforward "Intelligence Report/Update" as there's no point in advertising that there are agents out there should the sub be captured etc. You'd potentially be revealing one of your sources to the enemy.
Intelligence reports would cite "a reliable source" or "From: Codename-BULLDOG" etc which the sub skipper would know from prior on-shore briefings/experience that the "reliable source" is an island-spotter etc and he could make a decision accordingly.
