Added send text default too (#293)

Author: yuhuangou

fern/tools/default-tools.mdx

@@ -64,7 +64,7 @@ This function is provided when `endCall` is included in the assistant's list of
 
 #### Dial Keypad (DTMF)
 
-This function is provided when `dtmf` is included in the assistant's list of available tools (see configuration options [here](/api-reference/assistants/create#request.body.model.openai.tools.dtmf)). The assistant will be able to enter digits on the keypad.
+This function is provided when `dtmf` is included in the assistant's list of available tools (see configuration options [here](/api-reference/assistants/create#request.body.model.openai.tools.sms)). The assistant will be able to enter digits on the keypad.
 
 ```json
 {
@@ -85,6 +85,35 @@ This function is provided when `dtmf` is included in the assistant's list of ava
   }
 }
 ```
+
+#### Send Text
+
+This function is provided when `sms` is included in the assistant’s list of available tool (see configuration options [here](/api-reference/assistants/create#request.body.model.openai.tools.dtmf)). The assistant can use this function to send SMS messages using a configured Twilio account.
+
+```json
+{
+  "model": {
+    "provider": "openai",
+    "model": "gpt-3.5-turbo",
+    "messages": [
+      {
+        "role": "system",
+        "content": "You are an assistant. When the user asks you to send a text message, use the sms function."
+      }
+    ],
+    "tools": [
+      {
+        "type": "sms",
+        "metadata": {
+          "from": "+15551234567" 
+        }
+      }
+    ]
+  }
+}
+```
+
+
 <Accordion title="Custom Functions: Deprecated">
 ### Custom Functions