manipulating objects in Agent Script

 Agent Script does NOT support direct dot/bracket notation to write into object variable properties. This is a known limitation.

Here's what the official docs actually say about 

object

 type variables:

What IS supported:

Agent Script supports these variable types: 

string

, 

boolean

, 

number

, 

object

, and 

list[type]

. You can declare an 

object

 variable like this:

variables:
    CandidateList: mutable list[object] = []
        description: "List of contacts returned from an action"

How objects actually get populated — only via action outputs:

The only supported way to populate an 

object

 or 

list[object]

 variable is by capturing it from an action's output using 

set

:

reasoning:
    instructions: ->
        run @actions.Get_Questions
            with JobScreeningRecordId=@variables.JobRecordID
            set @variables.questions = @outputs.AllScreeningQuestions

You cannot do 

@variables.myObj.someKey = "value"

 or 

@variables.myObj["someKey"] = "value"

 — the language has no write syntax for individual object properties.

What you CAN do with objects after storing them:

• Read them in LLM prompts: 

{!@variables.questions[@variables.current_question]}

Pass the whole object as an action input

• Use 

len(@variables.myList)

 on a list of objects

The workaround:

If you need to build up a structured object with specific keys, the correct pattern is to:

1. Use separate primitive variables ( 

string

, 

boolean

, 

number

) for each field you need to track

1. Pass those individual variables as inputs to an action that assembles the object server-side (Apex/Flow)
2. Store the assembled result back via 

set @variables.result = @outputs.assembledObject

Docs references:

• Using List Variables
• Using Variables Effectively
• Agent Script Overview