CEL functions

This page is generated from GET {management}/projects/{project}/cel/functions on a host with no AddCelFunction registrations, so it lists exactly the functions every Alvo host knows. A name with several overloads has one row per overload.

A ? after a parameter type means the function receives a null argument; without it, a null argument makes the whole call null and the function is not invoked. A ? after the return type means the call may yield null even when every argument is present.

Profiles are the descriptor slots a call compiles in: Condition (a hook condition) and Mutate (a before-hook mutate value). Rules, computed fields and access levels admit no function call.

See CEL in Alvo for the profiles and the language subset, and Custom CEL functions to register your own.

Function	Signature	Returns	Profiles	Summary
contains	contains(text: String, search: String)	Bool	Condition, Mutate	Whether text holds search anywhere, comparing characters exactly; an empty search is always held.
endsWith	endsWith(text: String, suffix: String)	Bool	Condition, Mutate	Whether text ends with suffix, comparing characters exactly; every text ends with an empty suffix.
int	int(value: Decimal)	Int	Condition, Mutate	The value as a whole number: a decimal cut toward zero (2.9 is 2), or a text of digits with an optional sign; anything else fails the write.
int	int(value: String)	Int	Condition, Mutate	The value as a whole number: a decimal cut toward zero (2.9 is 2), or a text of digits with an optional sign; anything else fails the write.
lowerAscii	lowerAscii(text: String)	String	Condition, Mutate	Folds A-Z to a-z and changes nothing else: accented and other non-ASCII letters stay as they are.
math.abs	math.abs(x: Int)	Int	Condition, Mutate	The absolute value of x, of the same numeric type.
math.abs	math.abs(x: Decimal)	Decimal	Condition, Mutate	The absolute value of x, of the same numeric type.
math.ceil	math.ceil(x: Int)	Int	Condition, Mutate	The smallest whole number not below x (1.2 is 2, -1.5 is -1), of the same numeric type.
math.ceil	math.ceil(x: Decimal)	Decimal	Condition, Mutate	The smallest whole number not below x (1.2 is 2, -1.5 is -1), of the same numeric type.
math.floor	math.floor(x: Int)	Int	Condition, Mutate	The largest whole number not above x (1.8 is 1, -1.2 is -2), of the same numeric type.
math.floor	math.floor(x: Decimal)	Decimal	Condition, Mutate	The largest whole number not above x (1.8 is 1, -1.2 is -2), of the same numeric type.
math.greatest	math.greatest(a: Int, b: Int)	Int	Condition, Mutate	The larger of a and b; a when they are equal.
math.greatest	math.greatest(a: Decimal, b: Decimal)	Decimal	Condition, Mutate	The larger of a and b; a when they are equal.
math.least	math.least(a: Int, b: Int)	Int	Condition, Mutate	The smaller of a and b; a when they are equal.
math.least	math.least(a: Decimal, b: Decimal)	Decimal	Condition, Mutate	The smaller of a and b; a when they are equal.
math.round	math.round(x: Int)	Int	Condition, Mutate	Rounds x to a whole number, halves away from zero (2.5 is 3, -2.5 is -3), of the same numeric type.
math.round	math.round(x: Decimal)	Decimal	Condition, Mutate	Rounds x to a whole number, halves away from zero (2.5 is 3, -2.5 is -3), of the same numeric type.
math.round	math.round(x: Decimal, digits: Int)	Decimal	Condition, Mutate	Rounds x to digits places after the point, halves away from zero (2.345 to 2 places is 2.35); digits is from 0 to 28.
now	now()	Timestamp	Mutate	The instant this write is stamped with — the same one its audit columns get, never a clock read.
replace	replace(text: String, search: String, replacement: String)	String	Condition, Mutate	Replaces every occurrence of search in text with replacement, left to right, comparing characters exactly; an empty search changes nothing.
size	size(text: String)	Int	Condition, Mutate	The number of Unicode code points in text.
startsWith	startsWith(text: String, prefix: String)	Bool	Condition, Mutate	Whether text begins with prefix, comparing characters exactly; every text begins with an empty prefix.
string	string(value: Int)	String	Condition, Mutate	The value as text: digits for a number (no trailing zeros), true or false, a lower-case id, or an RFC 3339 instant in UTC.
string	string(value: Decimal)	String	Condition, Mutate	The value as text: digits for a number (no trailing zeros), true or false, a lower-case id, or an RFC 3339 instant in UTC.
string	string(value: Bool)	String	Condition, Mutate	The value as text: digits for a number (no trailing zeros), true or false, a lower-case id, or an RFC 3339 instant in UTC.
string	string(value: Uuid)	String	Condition, Mutate	The value as text: digits for a number (no trailing zeros), true or false, a lower-case id, or an RFC 3339 instant in UTC.
string	string(value: Timestamp)	String	Condition, Mutate	The value as text: digits for a number (no trailing zeros), true or false, a lower-case id, or an RFC 3339 instant in UTC.
substring	substring(text: String, start: Int)	String	Condition, Mutate	The code points of text from start (counted from 0) up to, not including, end — or to the end of text; a position outside text fails the write.
substring	substring(text: String, start: Int, end: Int)	String	Condition, Mutate	The code points of text from start (counted from 0) up to, not including, end — or to the end of text; a position outside text fails the write.
timestamp	timestamp(text: String)	Timestamp	Condition, Mutate	The text read as an RFC 3339 instant, such as 2026-10-05T12:00:00Z or 2026-10-05T14:00:00+02:00; anything else fails the write.
trim	trim(text: String)	String	Condition, Mutate	Removes spaces, tabs, line feeds and carriage returns from both ends of text; nothing else counts as whitespace.
upperAscii	upperAscii(text: String)	String	Condition, Mutate	Folds a-z to A-Z and changes nothing else: accented and other non-ASCII letters stay as they are.