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ref_geo_lookup — Look up a country by name, ISO alpha-2 code (2 letters), or ISO alpha-3 code (3 letters). Returns the full record: capital, region, official

ref_geo_search — Search and filter countries by region, subregion, language, currency, or free-text keyword. At least one filter is required. Returns a ranke

ref_timezone_lookup — Get timezone info by IANA ID, country code, or partial city/region name. Returns current UTC offset, standard offset, whether DST is current

ref_timezone_convert — Convert a local datetime from one timezone to another. Takes a local time string (no UTC offset, e.g., "2026-05-24T15:30:00") interpreted as

ref_element_lookup — Look up a periodic table element by name, chemical symbol, or atomic number. Returns the full data record: atomic number, symbol, name, atom

ref_element_search — Filter periodic table elements by category, group, period, atomic number range, or atomic mass range. At least one filter is required. Retur

ref_constant_lookup — Look up a fundamental physical constant by name, symbol, or common alias. Returns the CODATA 2022 value, SI unit expression, relative standa

ref_unit_convert — Convert a numeric value between compatible units of measure. Supports: length (mm, cm, m, km, in, ft, yd, mi), mass (mcg, mg, g, kg, oz, lb,