Action References

FunctionCallAction

Purpose Runs a reusable function written in MScript or defined in a shared library (e.g., LIB.utils.calculateTotal). It’s typically used to compute derived values, perform calculations, or call small utility functions.

When to use it

After parameters are validated (afterCheckParameters)
Before building the data clause (afterBuildDataClause)
For computed values before sending responses (afterBuildOutput)

Key fields

Field	Type	Description
`callScript`	MScript	Expression that represents the function call (e.g., `LIB.calcTax(this.amount)`).
`contextPropertyName`	String	Optional – name to store result in context (`this.<name>`).

Example

{
  "id": "a50-call-total",
  "name": "calculateTotal",
  "callScript": "LIB.finance.calculateInvoiceTotal(this.items)",
  "contextPropertyName": "invoiceTotal"
}

Was this page helpful?

Built with Documentation.AI

Last updated Jan 3, 2026