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Variable References

Use double curly braces in text fields: 
{{variable_name}}

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Valid Examples

"Hello {{customer_name}}, your appointment is at {{appointment_time}}"
"Your order #{{order_id}} will arrive on {{delivery_date}}"
"Call duration: {{call_duration}} seconds"

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Invalid Examples

{user_input}           ❌ Single braces
{{User Input}}         ❌ Spaces
{{user-input}}         ❌ Hyphens
{{userInput}}          ❌ camelCase not allowed
{{ user_input }}       ❌ Spaces inside braces

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Template Validation

The system checks:
  • Existence: Referenced variable exists
  • Syntax: Valid {{name}} form
  • Types: Value matches declared type where relevant
  • Availability: Variable is available at the current node (flow agent)

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Naming Conventions

All variables must follow these rules:

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Rules

  1. Format: snake_case only
  2. Start: Lowercase letter (a–z)
  3. Characters: Lowercase letters, digits, underscores
  4. Length: 1–50 characters
  5. Reserved: Do not reuse system variable names

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Valid Examples

customer_name          ✅
appointment_date_1     ✅
user_phone_number      ✅
api_response_data      ✅
is_premium_user        ✅

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Invalid Examples

customerName           ❌ camelCase
Customer_Name          ❌ Capital letters
customer-name          ❌ Hyphens
customer name          ❌ Spaces
123_customer           ❌ Starts with number
_customer_name         ❌ Starts with underscore
customer_name!         ❌ Special characters
See System Variables for reserved names and Validation for how errors are shown.