Add, subtract, multiply or divide two numbers and return the result as a number. Pure and stateless: no side effects, no network, no auth beyond the group's key, no rate limit of its own. Division by zero returns a tool error (isError) with a one-sentence message instead of a value. Use it when an exact arithmetic result matters; for anything beyond one binary operation, chain calls or compute in the model.

Convert a value between units of length (mm, cm, m, km, inch, foot, yard, mile), mass (mg, g, kg, tonne, ounce, pound) or temperature (celsius, fahrenheit, kelvin) and return the converted number. Pure and stateless, no side effects, no auth beyond the group's key. Units are matched case-insensitively by the names listed; an unknown unit or a conversion across families (length to mass) returns a tool error (isError) naming the accepted units. Use it for exact factor-based conversions; it does not handle currencies, dates or compound units such as km/h.

Count the characters, words and lines of a text and return the three counts as an object. Pure and stateless: the text is not stored or sent anywhere; no auth beyond the group's key. Words are whitespace-separated runs; lines are newline-separated (a trailing newline does not add a line); characters are Unicode code points including whitespace. Use it when a model needs an exact count rather than an estimate; it does not tokenise or detect language.