Create Custom Variable

Creates a new custom variable for the application. Use this endpoint to define dynamic values that can be injected into agent instructions. Source types: Variables can source values from message

POST /ai-agents/agent-builder/agents/variables/custom

Create Custom Variable

cURL

curl --request POST \
  --url https://{appId}.api-{region}.cometchat.io/v3/ai-agents/agent-builder/agents/variables/custom \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '
{
  "name": "user.preferred_language",
  "sourceType": "user_metadata",
  "description": "The preferred language of the user",
  "sourcePath": "language",
  "constantValue": "en",
  "defaultValue": "en"
}
'

200

{
  "_id": "507f1f77bcf86cd799439011",
  "appId": "my-app-id",
  "name": "user.plan",
  "description": "The user subscription plan",
  "sourceType": "user_metadata",
  "sourcePath": "metadata.plan",
  "constantValue": "",
  "defaultValue": "free",
  "category": "custom",
  "createdAt": 1700000000000,
  "updatedAt": 1700000000000
}

For the complete error reference, see Error Guide.

Authorizations

apikey · string · header · required

API Key (i.e. Rest API Key from the Dashboard).

Body

application/json

name · string · required

Unique variable name. Must start with a letter and contain only alphanumeric characters, underscores, and dots.

Maximum string length: 50

Pattern: ^[a-zA-Z][a-zA-Z0-9_.]*$

Example:

"user.preferred_language"

sourceType · enum<string> · required

Source from which the variable value is resolved

Available options: message_metadata, user_metadata, constant

Example:

"user_metadata"

description · string

Human-readable description of the variable

Maximum string length: 200

Example:

"The preferred language of the user"

sourcePath · string

Dot-notation path to extract the value from the source metadata

Maximum string length: 100

Example:

"language"

constantValue · string

Fixed value used when sourceType is constant

Maximum string length: 500

Example:

"en"

defaultValue · string

Fallback value used when the source path does not resolve

Maximum string length: 200

Example:

"en"

Response

200 - application/json

Custom variable created successfully

_id · string

Example:

"507f1f77bcf86cd799439011"

appId · string

Example:

"my-app-id"

name · string

Example:

"user.plan"

description · string

Example:

"The user subscription plan"

sourceType · string

Example:

"user_metadata"

sourcePath · string

Example:

"metadata.plan"

constantValue · string

Example:

"premium"

defaultValue · string

Example:

"free"

category · string

Example:

"custom"

createdAt · number

Example:

1700000000000

updatedAt · number

Example:

1700000000000