> ## Documentation Index > Fetch the complete documentation index at: https://docs.tigyai.com/llms.txt > Use this file to discover all available pages before exploring further. # Voice Agent Builder > Tig.ai's voice agent builder lets you design a conversation as a graph of nodes and pathways. Learn the graph model, the available node types, and where to start. Create a Voice Agent The Voice Agent Builder supports two editing approaches: a visual node editor for designing stages and pathways, and a raw text editor for writing the conversation flow directly. You can create a new agent from the [dashboard](https://app.tig.ai/workflow). Describe your use case and Tig.ai generates a starting workflow with default prompts and pathways, which you can then edit. ## The graph model A workflow is a directed graph: * **Nodes** represent a stage of the conversation or an action (e.g. greet the caller, collect an address, transfer the call). * **Pathways (edges)** connect nodes and represent the routes the LLM can take depending on what the caller says. The LLM decides at runtime which pathway to follow. A workflow should have only one **Start Call** node and typically ends at an **End Call** node, with **Agent** nodes and other node types in between. See [Editing a Workflow](/voice-agent/editing-a-workflow) for how nodes, pathways, and node-level toggles fit together. ## Node types | Node | What it does | | ----------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- | | [**Start Call**](/voice-agent/start-call) | Starts the call and configures the agent's greeting. Should have only one per workflow. | | [**Agent**](/voice-agent/agent) | Holds the prompt that drives conversation at a given stage; connects to other nodes via pathways. | | [**Global**](/voice-agent/global) | Common instructions (tone, objection handling) prepended to every node with "Add Global Prompt" enabled. | | [**QA**](/voice-agent/qa) | Runs automated post-call quality analysis against criteria you define. | | [**End Call**](/voice-agent/end-call) | Configures the agent's final message before the call is terminated. A workflow can have multiple End Call nodes, each with a distinct Prompt. | | [**Webhook**](/voice-agent/webhook) | Sends call results to an external system (CRM, Zapier, n8n) when a run ends. | Beyond nodes, you can extend an agent with: * [**Tools**](/voice-agent/tools/introduction) — let the LLM call external APIs or transfer calls mid-conversation. * [**Knowledge Base**](/voice-agent/knowledge-base) — attach documents the agent can reference during a call. * [**Pre-Call Data Fetch**](/voice-agent/pre-call-data-fetch) — enrich context with an HTTP call before the agent starts speaking. * [**Template Variables**](/voice-agent/template-variables) — reference `initial_context` and `gathered_context` values in prompts and payloads. ## Where to start 1. **New to Tig.ai?** Follow [Editing a Workflow](/voice-agent/editing-a-workflow) to learn the fundamentals of nodes and pathways. 2. **Want to test immediately?** Use a [Web Call](/core-concepts/calls-and-runs#web-calls) from the agent editor — no telephony setup required. 3. **Ready to go live?** Configure a [telephony provider](/integrations/telephony/overview) and set up inbound routing. 4. **Need the call to hit your systems?** Add a [Webhook](/voice-agent/webhook) node to sync results to your CRM or automation tool. 5. **Want to embed the agent on a website?** See [Add to Website](/voice-agent/add-to-website). ## Related * [Core Concepts: Workflows and Agents](/core-concepts/workflows-and-agents) * [Core Concepts: Context & Variables](/core-concepts/context-and-variables) * [Editing a Workflow](/voice-agent/editing-a-workflow)