The explanation endpoint returns the score and the constraints that are violated in the current solution. It can give the insights into why a solve was like it is.
NameTypeDescription
scoreScoreScore
conflictsConflictConflicts
unresolvedUnresolvedUnresolved constraints
alternativesAlternativeAlternative assignments when explanation is enabled (optional)
Example:
explanation
{
  "score": {
    "hard": 0,
    "soft": -6924,
    "feasible": true
  },
  "unresolved": [
    {
      "constraint": "JOB_DAY_INDEX",
      "score": "-7soft"
    },
    {
      "constraint": "TRAVEL_TIME",
      "score": "-6917soft"
    },
    {
      "constraint": "UNUSED_RESOURCES",
      "score": "-25200medium"
    }
  ]
}

​
Unresolved

NameTypeDescription
constraintstringRouting constraint name
scorestringscore of this constraint

​
Conflict

NameTypeDescription
constraintRoutingConstraintRouting constraint name
scorestringscore of this constraint
jobstringjob name in this conflict
resourcestringresource name in this conflict
tagstringtag name in this conflict

​
Constraint

The following constraints can appear in the explanation response:
NameDescriptionImpact
TRIP_CAPACITYVehicle capacity exceeded for a triphard
RESOURCE_CAPACITYResource capacity exceededhard
RESOURCE_CAPACITY2Secondary resource capacity exceededhard
TRAVEL_TIMETravel time optimizationsoft
TYPE_REQUIREMENTJob type requirements not met by resourcehard
TAG_SOFTSoft tag preference not satisfiedsoft
TAG_HARDHard tag requirement not satisfiedhard
TYPE_REQUIREMENT_SOFTSoft type requirement not satisfiedsoft
END_LOCATION_TRAVEL_TIMETravel time from last job to end locationsoft
TIME_WINDOW_CONFLICTJob scheduled outside its time windowhard
SHIFT_END_CONFLICTJob extends beyond resource shift end timehard
OVERTIME_END_CONFLICTJob extends beyond overtime limithard
RESOURCE_USAGEResource usage optimizationmedium
URGENCYUrgent job scheduling prioritysoft
PREFERRED_RESOURCE_CONFLICTJob not assigned to preferred resourcesoft
ALLOWED_RESOURCESJob assigned to non-allowed resourcehard
DISALLOWED_RESOURCESJob assigned to disallowed resourcehard
REGION_TIMERegional time constraint violationsoft
FAIR_WORKWork distribution fairness across resourcessoft
UNSERVED_JOBSJobs that could not be scheduledmedium
RESOURCE_ACTIVATIONResource activation costmedium
OPEN_DAYSResource scheduled on non-working dayhard
JOB_PRECEDENCEJob precedence order violatedhard
JOB_DAY_INDEXJob not scheduled on required daysoft
DATE_TIME_WINDOW_CONFLICTJob scheduled outside date/time windowhard
DATE_TIME_WINDOW_CONFLICT_SOFTSoft date/time window preference not metsoft
LINKED_JOB_CONFLICTLinked jobs constraint violationhard
PLANNED_RESOURCEJob not assigned to planned resourcesoft
PLANNED_ARRIVALJob arrival time differs from plannedsoft
PLANNED_DATEJob scheduled on different date than plannedsoft
WORKING_TIMETotal working time constraintsoft
HARD_JOBSHard job requirement not satisfiedhard
MAX_DRIVE_TIMEMaximum drive time per resource exceededhard
MAX_DRIVE_TIME_JOBMaximum drive time per job exceededhard
FAIR_TOTAL_WORKTotal work fairness across resourcessoft
RESOURCE_PERIOD_MAX_SERVICE_TIMEMaximum service time per period exceededhard
RESOURCE_PERIOD_MAX_DRIVE_TIMEMaximum drive time per period exceededhard
RESOURCE_PERIOD_MAX_WORK_TIMEMaximum work time per period exceededhard
RESOURCE_PERIOD_MIN_SERVICE_TIMEMinimum service time per period not metsoft
RESOURCE_PERIOD_MIN_DRIVE_TIMEMinimum drive time per period not metsoft
RESOURCE_PERIOD_MIN_WORK_TIMEMinimum work time per period not metsoft
MINIMISE_TRIP_USAGETrip usage minimizationsoft
DELIVERY_NOT_ON_SAME_VEHICLEPickup and delivery not on same vehiclehard
DELIVERY_BEFORE_PICKUPDelivery scheduled before pickuphard
SAME_TRIPJobs must be on same triphard
SEQUENCEJob sequence constrainthard
SAME_TIMEJobs must be at same timehard
NEIGHBORJobs must be neighbors in sequencehard
DIRECT_SEQUENCEJobs must be in direct sequencehard
SAME_RESOURCEJobs must be assigned to same resourcehard
WAIT_TIMEWait time optimizationsoft
DRIVE_TIMEDrive time optimizationsoft

Explains the conflicts of a certain routing solution and the unresolved constraints.