diff --git a/services/openai-dialog/src/lib.rs b/services/openai-dialog/src/lib.rs
index c638360..27042a9 100644
--- a/services/openai-dialog/src/lib.rs
+++ b/services/openai-dialog/src/lib.rs
@@ -15,7 +15,10 @@ use openai_api_rs::realtime::{
     api::RealtimeClient,
     client_event::{self, ClientEvent},
     server_event::{self, ServerEvent},
-    types::{self, ItemContentType, ItemRole, ItemStatus, ItemType, RealtimeVoice, ResponseStatus},
+    types::{
+        self, ItemContentType, ItemRole, ItemStatus, ItemType, RealtimeVoice, ResponseStatus,
+        ToolChoice,
+    },
 };
 use serde::{Deserialize, Serialize};
 use tokio::{net::TcpStream, select};
@@ -42,6 +45,7 @@ pub struct Params {
     pub temperature: Option<f32>,
     #[serde(default)]
     pub tools: Vec<types::ToolDefinition>,
+    tool_choice: Option<ToolChoice>,
 }
 
 impl Params {
@@ -54,6 +58,7 @@ impl Params {
             voice: None,
             temperature: None,
             tools: vec![],
+            tool_choice: None,
         }
     }
 }
@@ -113,9 +118,18 @@ pub enum ServiceInputEvent {
     Prompt {
         text: String,
     },
+    #[serde(rename_all = "camelCase")]
     SessionUpdate {
+        #[serde(skip_serializing_if = "Option::is_none")]
+        instructions: Option<String>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        voice: Option<RealtimeVoice>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        temperature: Option<f32>,
         #[serde(skip_serializing_if = "Option::is_none")]
         tools: Option<Vec<types::ToolDefinition>>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        tool_choice: Option<ToolChoice>,
     },
 }
 
@@ -251,11 +265,6 @@ impl Client {
                 send_update = true;
             };
 
-            if !params.tools.is_empty() {
-                session.tools = Some(params.tools);
-                send_update = true;
-            }
-
             if let Some(voice) = params.voice {
                 session.voice = Some(voice);
                 send_update = true;
@@ -266,6 +275,16 @@ impl Client {
                 send_update = true;
             }
 
+            if !params.tools.is_empty() {
+                session.tools = Some(params.tools);
+                send_update = true;
+            }
+
+            if let Some(tool_choice) = params.tool_choice {
+                session.tool_choice = Some(tool_choice);
+                send_update = true;
+            }
+
             if send_update {
                 self.send_client_event(ClientEvent::SessionUpdate(client_event::SessionUpdate {
                     event_id: None,
@@ -415,10 +434,20 @@ impl Client {
                         info!("Received prompt");
                         self.push_prompt(PromptRequest(text)).await?;
                     }
-                    ServiceInputEvent::SessionUpdate { tools } => {
+                    ServiceInputEvent::SessionUpdate {
+                        instructions,
+                        voice,
+                        temperature,
+                        tools,
+                        tool_choice,
+                    } => {
                         let event = ClientEvent::SessionUpdate(client_event::SessionUpdate {
                             session: types::Session {
+                                instructions,
+                                voice,
+                                temperature,
                                 tools,
+                                tool_choice,
                                 ..Default::default()
                             },
                             ..Default::default()