Build visual conversational flows for AI voice agents and chat assistants. Learn about node types, the engine, transitions, variables, and more.
Route conversations dynamically using the Logic node. Learn about operators, AND/OR logic, branch evaluation order, and default paths.
Learn how to extract structured data from conversations and set variables using the Extraction and Variable nodes.
Learn how to execute external tools, APIs, and HTTP requests within your flow using Tool/Function nodes and Request (API Call) nodes.
How to use the built-in test drawer in Flow Builder to simulate conversations, inspect variables, and debug your flow.
Generate and embed the Flow Builder chat widget on your website with customizable colors, position, and welcome message.
Make HTTP API calls from your flow using the Request node. Configure methods, headers, body, variable interpolation, and response handling.
Deep dive into the Conversation node — the core building block of every flow. Learn about prompt and static modes, transitions, global nodes, and more.
Use the AI-powered node builder to auto-generate prompts, transitions, and node configurations in Flow Builder.
Technical deep dive into the Flow Builder engine — the state machine loop, processing order, async execution, streaming events, and LLM resolution.
Learn the fundamentals of Flow Builder — the visual drag-and-drop editor for creating conversational AI flows with nodes, edges, and transitions.
Master the variable system — dynamic substitution, variable categories, the VariablePicker UI, initialization webhooks, and special system variables.
Learn how to add your OpenAI, Anthropic, or OpenRouter API key to Flow Builder before testing or deploying your flow.
Connect a Telnyx phone number to your Flow Builder agent for AI-powered inbound voice calls with real-time streaming.