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

# Workflow Node Types API

> Discover every node type with its configuration parameters, defaults and bounds, plus the variable namespaces available to conditions.

<Note>
  The catalog is generated from the same models that publish enforces, so it never drifts from what the engine accepts. See the [node reference](/docs/guides/workflows/nodes) for worked examples of each type.
</Note>


## OpenAPI

````yaml GET /workflow-node-types
openapi: 3.1.0
info:
  title: Bolna API
  description: >-
    Use and leverage Bolna Voice AI using APIs through HTTP requests from any
    language in your applications and workflows.
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://api.bolna.ai
    description: Production server
security:
  - bearerAuth: []
paths:
  /workflow-node-types:
    get:
      description: >-
        Lists every node type with its configuration parameters, defaults and
        bounds, plus the available variable namespaces and effects. Node types
        without an executor are returned with `available` set to `false` rather
        than omitted.
      responses:
        '200':
          description: The node-type catalog
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WorkflowNodeTypeCatalog'
components:
  schemas:
    WorkflowNodeTypeCatalog:
      type: object
      required:
        - node_types
        - namespaces
      properties:
        node_types:
          type: array
          items:
            $ref: '#/components/schemas/WorkflowNodeType'
        namespaces:
          type: array
          items:
            type: string
          description: >-
            The variable namespaces usable in conditions — `call`, `entry`,
            `extraction`, `node`, `response`, `state`, `whatsapp`.
        effects:
          type: array
          items:
            type: object
          description: Available case effects, e.g. `set_value`.
    WorkflowNodeType:
      type: object
      required:
        - type
        - label
        - available
        - transition
      properties:
        type:
          type: string
          enum:
            - start
            - agent
            - extraction
            - api
            - time
            - retry
            - aisensy_whatsapp
            - end
        label:
          type: string
        summary:
          type: string
        available:
          type: boolean
          description: Whether the node type can be published and executed.
        unavailable_reason:
          type: string
          nullable: true
        transition:
          type: string
          enum:
            - cases
            - to
            - none
          description: >-
            How the node routes onward — condition `cases`, a single `to`, or
            `none` for terminal nodes.
        branches_on:
          type: string
          description: The variables this node's cases typically branch on.
        params:
          type: array
          items:
            $ref: '#/components/schemas/WorkflowNodeTypeParam'
    WorkflowNodeTypeParam:
      type: object
      required:
        - name
        - type
        - required
      properties:
        name:
          type: string
        type:
          type: string
          description: >-
            One of `string`, `integer`, `number`, `boolean`, `enum`, `object`,
            `array`, `union`, `any`.
        required:
          type: boolean
        default:
          description: Default value when omitted.
        description:
          type: string
        min:
          type: number
        max:
          type: number
        options:
          type: array
          items: {}
          description: Allowed values for `enum` params.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

````