Search the Vlada substrate catalog by keyword. Returns the matching data sources (commercial TiC, hospital HPT, Medicare, drug pricing, provider identity, curated marts, provenance registries) ranked by relevance. Compact by default (identity + queryable + claim ceiling + the exact describe_data_source call per hit); pass verbosity='full' for the previous full source_product_card per result. Paginates with limit (default 25, max 200) + offset; the response carries total_count, returned_count, and offset. Optional filters: {domain, stage, status, limit}. Agents call this first to discover what data Vlada has. Since 2026-09-02 the answer leads with DATA POINTS (data_points: the measure/dimension asked for, with its source, door, table.column and must-read trap) and the table cards follow as physical locations. Every hit carries source_code -- the one public code, which describe_data_source accepts verbatim -- alongside the table's source_fqn. Points and tables are ranked by ONE ranker (the authored data-point scorer). Retired tables are never returned; they appear only as supersedes on the live successor's card. BOUNDED (2026-09-18): the default call is compact and paged -- both the table cards and the data points come back a page at a time, each with its own total and next offset -- so a default call can never truncate. Pass verbosity='full' for the whole point record and the full source_product_card per hit.