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

# Voice Agent Builder

> Bananaflow'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.

The Voice Agent Builder is a visual, graph-based editor for designing what your voice agent says and does during a call. Instead of writing one giant prompt, you break the conversation into **nodes** (stages of the conversation) connected by **pathways** (the routes the LLM can take between stages, based on how the conversation is going).

You can create a new agent from the [dashboard](https://app.bananaflow.ai/workflow) with **Create Agent**. The new agent starts with a single Start Call node and opens on **Build with AI**, where you describe your use case and Bananaflow builds the nodes, prompts, and pathways for you to 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. |
| [**API Trigger**](/voice-agent/api-trigger) | Exposes an endpoint so external systems (n8n, Zapier, your backend) can start outbound calls. |
| [**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, transfer calls, or invoke MCP servers 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.
* [**Pre-recorded Audio**](/voice-agent/pre-recorded-audio) – mix in real recordings alongside LLM-generated speech.
* [**Template Variables**](/voice-agent/template-variables) – reference `initial_context` and `gathered_context` values in prompts and payloads.

## Where to start

1. **New to Bananaflow?** 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 add an [API Trigger](/voice-agent/api-trigger) or 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)


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