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Extracted variables are flow-agent only. They are created by nodes during execution from user input, tool responses, or DTMF and are available to successor nodes.

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Types of Extraction

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1. AI Extracted Variables (Conversation Nodes)

AI extraction uses LLM function calling to pull structured data from the conversation using natural language instructions. Configuration:
  • Extraction Method: llm_function_calling
  • Extraction Prompt: Natural language description of what to extract
  • Data Type: string, number, boolean, array, or object
  • Required: Whether the node depends on this extraction succeeding
Example: 
Variable: customer_name
Extraction Prompt: "Extract the customer's full name from their response"
Data Type: string
Required: true
Supported Data Types: string, number, boolean, array, object Advanced: Enum values, nested objects, array item types

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2. Toolpath Extracted Variables (Tool & Web Tool Nodes)

Toolpath extraction uses JSONPath to pull values from tool response data. Configuration:
  • User format: $.path.to.value (JSONPath)
  • Backend format: result.path.to.value (converted automatically)
  • Validation: Against actual (API) or expected (Web) response
  • Response format: JSON object or plain string
JSONPath examples: 
$.data.user.email          → Nested field
$.items[0].name            → First item
$.results[*].id            → All IDs
$.data.prices[?(@.active)] → Filter
$                          → Entire response (for string)
Response formats:
  1. Object (JSON): Use paths like $.data.user, $.data.items[0]
  2. String: Use $ to get the full string

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API Tool Nodes

  1. Click Test Tool to run with real data
  2. Use the path selector on the actual response
  3. Browse the tree, click a field to set the JSONPath
  4. Check the preview and save

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Web Tool Nodes

Web tools run in the browser and can’t be tested server-side:
  1. Define expected response: Paste JSON object or string
  2. Open the path selector and use that structure
  3. Click fields to set paths and preview
  4. Manually test the web tool to confirm the real response matches
Example expected response (object): 
{
  "cart": {
    "total": 149.99,
    "items": [{"name": "Product A", "price": 49.99}],
    "item_count": 2
  }
}
Or as string: "Successfully added 2 items to cart. Total: $149.99" Best practices:
  • API: Test first, then configure extraction; test success and error shapes
  • Web: Define a realistic expected structure; document object vs string; test manually

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3. DTMF Captured Variables (Conversation & Start Nodes)

DTMF capture creates a variable from keypad input (0-9, *, #). Configuration:
  • Enable DTMF Capture: Toggle in node settings
  • Variable Name: Name for the captured value
  • Sync: Automatically added to extracted variables
Characteristics: Always string; when enabled, number-key DTMF transitions are disabled for that node. Example: 
Variable: account_number
DTMF Capture: Enabled
Description: "DTMF captured input"

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Extraction Availability

Extracted variables are available only to successor nodes:
  • ✅ Nodes that run after the node that created the variable
  • ❌ Nodes that run before or in parallel
  • ❌ Global nodes (isGlobal: true)
See Availability & Context for full rules and Advanced Features for the path selector and nested/array types.