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    API Reference ↗
    Ontology buildingFunctionsLanguage agnostic featuresUser-facing errors

    User-facing errors

    When running functions in other parts of the platform, such as Workshop or actions, you may want to throw an error with a detailed message. To do so, throw a UserFacingError. For example:

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import { Function, UserFacingError } from "@foundry/functions-api";
import { Employee } from "@foundry/ontology-api";

export class MyFunctions {
    @Function()
    public async searchExactlyFiveEmployees(employees: Employee[]): Proimse<string> {
        if (employees.length != 5) {
            throw new UserFacingError(`Pass in exactly 5 employees. Received ${employees.length}.`);
        }

        // search employees
    }
}
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import { Osdk } from "@osdk/client";
import { Employee } from "@ontology/sdk";
import { UserFacingError } from "@osdk/functions";

export default async function searchExactlyFiveEmployees(employees: Array<Osdk.Instance<Employee>>): Promise<string> {
    if (employees.length != 5) {
        throw new UserFacingError(`Pass in exactly 5 employees. Received ${employees.length}.`);
    }

    // search employees
}
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from functions.api import function, UserFacingError
from ontology_sdk import FoundryClient
from ontology_sdk.ontology.objects import Aircraft

@function()
def search_exactly_five_employees(
    employees: list[Aircraft]
) -> str:
    if not len(aircraft) == 5:
        raise UserFacingError(f"Pass in exactly 5 employees. Received ${len(aircraft)}.")

    # search employees

    When running this as a Function-backed Action in a Workshop application with an incorrect number of employees, users will see the following error:

    user-facing-error

    By adding a detailed user facing error message, you can help other users of your Function quickly identify and fix the issue.