add Assistant node page

Author: arthurchi93

fern/docs.yml

@@ -239,6 +239,8 @@ navigation:
                     path: workflows/nodes/gather.mdx
                   - page: API Request
                     path: workflows/nodes/api-request.mdx
+                  - page: Assistant
+                    path: workflows/nodes/assistant.mdx
                   - page: Transfer
                     path: workflows/nodes/transfer.mdx
                   - page: Hangup

fern/workflows/nodes/assistant.mdx

@@ -0,0 +1,23 @@
+---
+title: Assistant
+subtitle: Speak to a configured assistant
+slug: /workflows/nodes/assistant
+---
+
+## Overview
+
+The **Assistant** node enables a persistent conversation with one of your configured assistants.
+
+## Configuration
+
+- **Select an Assistant** Use the dropdown to select a pre-configured assistant.
+
+## Usage
+
+Add **Assistant** nodes as leaf nodes to enable ongoing conversations with your configured assistants. Currently, Assistant nodes must be placed at the end of a workflow branch, as they don't support transitioning to other nodes. This means the conversation with the assistant will continue until either the user ends the call or the assistant reaches a natural conclusion point.
+
+The assistant will use its configured system prompt while inheriting the transcriber and voice settings from the global workflow assistant.
+
+<Note>
+Assistant nodes are currently designed as terminal nodes - they cannot be connected to other nodes in the workflow. This means the conversation will remain with the assistant until the call ends. Future updates will add support for AI-powered conditional branching.
+</Note>