> ## Documentation Index
> Fetch the complete documentation index at: https://docs.callkaro.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# 18. Variable Source and Formatting

**Variable Source:** choose where the agent should get a variable's value from. Example: pull the customer's name from a CRM like HubSpot instead of asking for it during the call.

**Formatting:** control how the variable's value is shown or spoken by the agent. Example: turn 17/06/2026 into “17th June 2026” when the agent says it aloud.