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Overview

The Logic node routes conversations based on variable values. It evaluates conditions against your flow’s variables and sends the conversation down different paths — no LLM call required. Think of it as an if/else-if/else block for your flow.

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How Branches Work

Each Logic node has one or more branches. A branch contains one or more conditions, and each condition checks a variable against a value using an operator. Branches are evaluated in order, top to bottom. The first branch whose conditions are all satisfied wins. If no branch matches, the default path is taken.

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Branch Logic: AND vs OR

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Operators

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Default Path

If you don’t connect a default path and no branches match, the engine has nowhere to go and the flow stalls. Always wire up the default output.

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Real-World Examples

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Lead Qualification

  • Branch 1 (AND): budget > 5000 AND company_size > 10 → “Qualified Lead” conversation
  • Branch 2: budget > 1000 → “Warm Lead” conversation
  • Default: “Nurture” conversation

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Language Routing

  • Branch 1: preferred_language equals Spanish → Spanish flow
  • Branch 2: preferred_language equals French → French flow
  • Default: English flow

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Data Completeness Check

  • Branch 1 (AND): name not_empty AND email not_empty AND phone not_empty → Proceed to API call
  • Default: Loop back to conversation node for missing info

Conversation Node

The core dialogue node

Variables

Dynamic data in your flows

Extraction Nodes

Extract data from conversations

Flow Builder Guide

Comprehensive usage guide