Give your agent tools that don't guess.

The right tool,
not a best guess.

• Calculate1 use

  Evaluate an arithmetic expression and return a numeric result. Basic arithmetic and integer powers use exact rational arithmetic internally. Supports + - * / % ^ (or **), parentheses, the constants pi, e, tau and the functions abs, sqrt, cbrt, exp, ln, log, log2, log10, sin, cos, tan, asin, acos, atan, atan2, sinh, cosh, tanh, floor, ceil, round, trunc, min, max, pow, hypot. Scientific functions and constants are approximate; trigonometry uses radians. Numeric output is limited to native integers and doubles; nonzero underflow is rejected. round(x, precision) requires an integer precision from -308 to 308. Exact arithmetic is limited to 4096 digits.

• Convert units0 uses

  Convert a value between compatible units using exact rational arithmetic locally. Requires value, from, and to. Use decimal strings to preserve input precision. Result is a decimal string with at most precision decimal places (default 12, range 0–100), rounded half away from zero, with an explicit rounded flag; trailing fractional zeros are removed. Absolute temperatures (K, degC, degF) must be at least zero kelvin; differences use delta_K, delta_degC, delta_degF without offsets. International foot and avoirdupois mass; US liquid and imperial volumes use explicit suffixes. MB is 1000000 bytes; MiB is 1048576 bytes. Days are 86400 seconds; calendar months/years and arbitrary compound expressions are unsupported. Value strings are limited to 128 ASCII characters and scientific exponents to ±1000. One call unit per conversion; supports standard catalog batching. Case-sensitive symbols. length: nm, um, mm, cm, m, km, in, ft, yd, mi, nmi; mass: mg, g, kg, t, oz, lb, st; area: mm2, cm2, m2, km2, in2, ft2, yd2, acre, ha; volume: mL, L, m3, in3, ft3, gal_us, qt_us, pt_us, fl_oz_us, gal_imp, qt_imp, pt_imp, fl_oz_imp; duration: ms, s, min, h, d, wk; speed: m/s, km/h, ft/s, mph, kn; temperature: K, degC, degF; temperature_difference: delta_K, delta_degC, delta_degF; data: bit, B, kB, MB, GB, TB, PB, KiB, MiB, GiB, TiB, PiB.

• Date and time0 uses

  Inspect dates (including weekday), add or subtract time, calculate differences, and convert timezones. Requires explicit IANA timezones and ISO dates or timestamps; never uses the current time. Years/months/weeks/days are calendar arithmetic preserving local time; hours/minutes/seconds are elapsed time. Month/year arithmetic clamps to the last day by default (or rejects with month_overflow=reject). Nonexistent local times are rejected; ambiguous times require ambiguity=earlier/later or a matching explicit offset. Difference is other_datetime minus datetime; exact seconds are returned as a decimal string. Years 0001–9999 and microsecond precision only. One unit per operation; supports the standard batch endpoint. Returns the runtime timezone database version.