describe_dataset

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Learn the dataset before writing SQL for query_dataset; call with no arguments first. Returns text. Prefer a typed tool when one answers the question. - No arguments: every view with one line, the join map, the four invariants (dev-branch isolation, no SUM(usage), *_seq compares, adoption polarity), the gotchas behind empty results (fqn forms, placeholders, machine names), the recipe index. - view=<name>, or views=[…] for several in one call: columns with types and descriptions, an example filter that returns rows, the joins that reach the view. - recipe=<id>: a ready-to-run statement for a common question (who uses a symbol, deprecated symbols per project, a change record's adoption, symbols deprecated between minors, one project's deprecated uses, change records between minors); substitute the placeholders and run it with query_dataset.