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

# Flow Builder Schemas

The API allows you to describe flow nodes through the API. When creating/updating a versioned prompt, you want to specify an
object that conforms to the appropriate schema in the `nodeData` field. If you want to use the output of a previous node
in a future node, you can reference it by using double curly braces. For example, if you have a node with the ID `node_1`
and you want to use the output of `node_1` in `node_2`, you can reference it as `{{node.node_1.output}}` in any string field.
The notation to lookup any data is `{{node.node_id.field_name}}`.

### Function Call

**Type:** <br />
`function_call`

**Schema:**

```typescript theme={null}
{
  functionId: string, // The ID of the function to call within vogent
  inputs: {
    name: string,
    value: string
  }[], // The inputs to the function
  outputs: {
    type: "BOOLEAN" | "STRING" | "INTEGER" | "FLOAT" | "CUSTOM",
    name: string,
    nullable: bool,
    description: string,
    customFieldJsonSchema?: string, // If the type is CUSTOM, this is the JSON schema for the field
  }[]
}
```

### Question

**Type:** <br />
`question`

**Schema:**

```typescript theme={null}
{
  questionSchemaId?: string,
  question: string,
  questionType: "multiple_choice" | "multiple_select" | "freeform" | "numeric",
  options?: string[],
  clarificationDetails?: string, // Any clarification details that may be helpful to the model
}
```

### Freeform

**Type:** <br />
`freeform`

**Schema:**

```typescript theme={null}
{
  prompt: string // The prompt to feed to the model
}
```