Counts a file no extractor reads on the deepest folder the outline already shows for it, or
on its top-level folder. Call it after every indexed file is added.
Format references list for callers/callees with optional limit footer.
One line for the import statements of a target: their count and the first three sites.
The answer when a category matches no fact. A known alias gets only the alias summary, and
import says where imports are, because most extractors record imports as symbols. Any other
category lists every raw category, so the agent can pick one.
Format available structural fact & literal categories.
The first line of a fact query that matched nothing; it names the path the query was limited to.