diff --git a/Cargo.lock b/Cargo.lock
index 4902050017c3143965c3764f1b84d7c4fcaaba85..a4b12223e5a8fe6770464280bf652e08346a26ba 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -114,6 +114,7 @@ dependencies = [
  "serde",
  "serde_json",
  "settings",
+ "smol",
  "theme",
  "tiktoken-rs",
  "util",
diff --git a/crates/ai/Cargo.toml b/crates/ai/Cargo.toml
index 9d67cbd108e79145db2bae2c709ee4d7c0b61660..7f8954bb21ea88a0b14f7fd5bacf26743de3c6be 100644
--- a/crates/ai/Cargo.toml
+++ b/crates/ai/Cargo.toml
@@ -28,6 +28,7 @@ isahc.workspace = true
 schemars.workspace = true
 serde.workspace = true
 serde_json.workspace = true
+smol.workspace = true
 tiktoken-rs = "0.4"
 
 [dev-dependencies]
diff --git a/crates/ai/src/ai.rs b/crates/ai/src/ai.rs
index 40224b3229de1665e3fac89be0d035154e2cf67f..b3b62c6a2422f0a354f27a34f0e28ffea23af95f 100644
--- a/crates/ai/src/ai.rs
+++ b/crates/ai/src/ai.rs
@@ -7,7 +7,7 @@ use serde::{Deserialize, Serialize};
 use std::fmt::{self, Display};
 
 // Data types for chat completion requests
-#[derive(Serialize)]
+#[derive(Debug, Serialize)]
 struct OpenAIRequest {
     model: String,
     messages: Vec<RequestMessage>,
diff --git a/crates/ai/src/assistant.rs b/crates/ai/src/assistant.rs
index d5c50146c35b5d463bf573a082ac438c0ec16d11..ce816f147bac15db7a12ac2dbc7666303ff098b5 100644
--- a/crates/ai/src/assistant.rs
+++ b/crates/ai/src/assistant.rs
@@ -473,7 +473,7 @@ impl Assistant {
         language_registry: Arc<LanguageRegistry>,
         cx: &mut ModelContext<Self>,
     ) -> Self {
-        let model = "gpt-3.5-turbo";
+        let model = "gpt-3.5-turbo-0613";
         let markdown = language_registry.language_for_name("Markdown");
         let buffer = cx.add_model(|cx| {
             let mut buffer = Buffer::new(0, "", cx);
@@ -518,7 +518,7 @@ impl Assistant {
             MessageMetadata {
                 role: Role::User,
                 sent_at: Local::now(),
-                error: None,
+                status: MessageStatus::Done,
             },
         );
 
@@ -543,7 +543,7 @@ impl Assistant {
 
     fn count_remaining_tokens(&mut self, cx: &mut ModelContext<Self>) {
         let messages = self
-            .open_ai_request_messages(cx)
+            .messages(cx)
             .into_iter()
             .filter_map(|message| {
                 Some(tiktoken_rs::ChatCompletionRequestMessage {
@@ -552,7 +552,7 @@ impl Assistant {
                         Role::Assistant => "assistant".into(),
                         Role::System => "system".into(),
                     },
-                    content: message.content,
+                    content: self.buffer.read(cx).text_for_range(message.range).collect(),
                     name: None,
                 })
             })
@@ -589,97 +589,169 @@ impl Assistant {
         cx.notify();
     }
 
-    fn assist(&mut self, cx: &mut ModelContext<Self>) -> Option<(MessageAnchor, MessageAnchor)> {
-        let request = OpenAIRequest {
-            model: self.model.clone(),
-            messages: self.open_ai_request_messages(cx),
-            stream: true,
-        };
+    fn assist(
+        &mut self,
+        selected_messages: HashSet<MessageId>,
+        cx: &mut ModelContext<Self>,
+    ) -> Vec<MessageAnchor> {
+        let mut user_messages = Vec::new();
+        let mut tasks = Vec::new();
+        for selected_message_id in selected_messages {
+            let selected_message_role =
+                if let Some(metadata) = self.messages_metadata.get(&selected_message_id) {
+                    metadata.role
+                } else {
+                    continue;
+                };
+
+            if selected_message_role == Role::Assistant {
+                if let Some(user_message) = self.insert_message_after(
+                    selected_message_id,
+                    Role::User,
+                    MessageStatus::Done,
+                    cx,
+                ) {
+                    user_messages.push(user_message);
+                } else {
+                    continue;
+                }
+            } else {
+                let request = OpenAIRequest {
+                    model: self.model.clone(),
+                    messages: self
+                        .messages(cx)
+                        .filter(|message| matches!(message.status, MessageStatus::Done))
+                        .flat_map(|message| {
+                            let mut system_message = None;
+                            if message.id == selected_message_id {
+                                system_message = Some(RequestMessage {
+                                    role: Role::System,
+                                    content: concat!(
+                                        "Treat the following messages as additional knowledge you have learned about, ",
+                                        "but act as if they were not part of this conversation. That is, treat them ",
+                                        "as if the user didn't see them and couldn't possibly inquire about them."
+                                    ).into()
+                                });
+                            }
+
+                            Some(message.to_open_ai_message(self.buffer.read(cx))).into_iter().chain(system_message)
+                        })
+                        .chain(Some(RequestMessage {
+                            role: Role::System,
+                            content: format!(
+                                "Direct your reply to message with id {}. Do not include a [Message X] header.",
+                                selected_message_id.0
+                            ),
+                        }))
+                        .collect(),
+                    stream: true,
+                };
+
+                let Some(api_key) = self.api_key.borrow().clone() else { continue };
+                let stream = stream_completion(api_key, cx.background().clone(), request);
+                let assistant_message = self
+                    .insert_message_after(
+                        selected_message_id,
+                        Role::Assistant,
+                        MessageStatus::Pending,
+                        cx,
+                    )
+                    .unwrap();
+
+                tasks.push(cx.spawn_weak({
+                    |this, mut cx| async move {
+                        let assistant_message_id = assistant_message.id;
+                        let stream_completion = async {
+                            let mut messages = stream.await?;
+
+                            while let Some(message) = messages.next().await {
+                                let mut message = message?;
+                                if let Some(choice) = message.choices.pop() {
+                                    this.upgrade(&cx)
+                                        .ok_or_else(|| anyhow!("assistant was dropped"))?
+                                        .update(&mut cx, |this, cx| {
+                                            let text: Arc<str> = choice.delta.content?.into();
+                                            let message_ix = this.message_anchors.iter().position(
+                                                |message| message.id == assistant_message_id,
+                                            )?;
+                                            this.buffer.update(cx, |buffer, cx| {
+                                                let offset = this.message_anchors[message_ix + 1..]
+                                                    .iter()
+                                                    .find(|message| message.start.is_valid(buffer))
+                                                    .map_or(buffer.len(), |message| {
+                                                        message
+                                                            .start
+                                                            .to_offset(buffer)
+                                                            .saturating_sub(1)
+                                                    });
+                                                buffer.edit([(offset..offset, text)], None, cx);
+                                            });
+                                            cx.emit(AssistantEvent::StreamedCompletion);
+
+                                            Some(())
+                                        });
+                                }
+                                smol::future::yield_now().await;
+                            }
 
-        let api_key = self.api_key.borrow().clone()?;
-        let stream = stream_completion(api_key, cx.background().clone(), request);
-        let assistant_message =
-            self.insert_message_after(self.message_anchors.last()?.id, Role::Assistant, cx)?;
-        let user_message = self.insert_message_after(assistant_message.id, Role::User, cx)?;
-        let task = cx.spawn_weak({
-            |this, mut cx| async move {
-                let assistant_message_id = assistant_message.id;
-                let stream_completion = async {
-                    let mut messages = stream.await?;
-
-                    while let Some(message) = messages.next().await {
-                        let mut message = message?;
-                        if let Some(choice) = message.choices.pop() {
                             this.upgrade(&cx)
                                 .ok_or_else(|| anyhow!("assistant was dropped"))?
                                 .update(&mut cx, |this, cx| {
-                                    let text: Arc<str> = choice.delta.content?.into();
-                                    let message_ix = this
-                                        .message_anchors
-                                        .iter()
-                                        .position(|message| message.id == assistant_message_id)?;
-                                    this.buffer.update(cx, |buffer, cx| {
-                                        let offset = if message_ix + 1 == this.message_anchors.len()
-                                        {
-                                            buffer.len()
-                                        } else {
-                                            this.message_anchors[message_ix + 1]
-                                                .start
-                                                .to_offset(buffer)
-                                                .saturating_sub(1)
-                                        };
-                                        buffer.edit([(offset..offset, text)], None, cx);
+                                    this.pending_completions.retain(|completion| {
+                                        completion.id != this.completion_count
                                     });
-                                    cx.emit(AssistantEvent::StreamedCompletion);
-
-                                    Some(())
+                                    this.summarize(cx);
                                 });
-                        }
-                    }
-
-                    this.upgrade(&cx)
-                        .ok_or_else(|| anyhow!("assistant was dropped"))?
-                        .update(&mut cx, |this, cx| {
-                            this.pending_completions
-                                .retain(|completion| completion.id != this.completion_count);
-                            this.summarize(cx);
-                        });
-
-                    anyhow::Ok(())
-                };
 
-                let result = stream_completion.await;
-                if let Some(this) = this.upgrade(&cx) {
-                    this.update(&mut cx, |this, cx| {
-                        if let Err(error) = result {
-                            if let Some(metadata) =
-                                this.messages_metadata.get_mut(&assistant_message.id)
-                            {
-                                metadata.error = Some(error.to_string().trim().into());
-                                cx.notify();
-                            }
+                            anyhow::Ok(())
+                        };
+
+                        let result = stream_completion.await;
+                        if let Some(this) = this.upgrade(&cx) {
+                            this.update(&mut cx, |this, cx| {
+                                if let Some(metadata) =
+                                    this.messages_metadata.get_mut(&assistant_message.id)
+                                {
+                                    match result {
+                                        Ok(_) => {
+                                            metadata.status = MessageStatus::Done;
+                                        }
+                                        Err(error) => {
+                                            metadata.status = MessageStatus::Error(
+                                                error.to_string().trim().into(),
+                                            );
+                                        }
+                                    }
+                                    cx.notify();
+                                }
+                            });
                         }
-                    });
-                }
+                    }
+                }));
             }
-        });
+        }
 
-        self.pending_completions.push(PendingCompletion {
-            id: post_inc(&mut self.completion_count),
-            _task: task,
-        });
-        Some((assistant_message, user_message))
+        if !tasks.is_empty() {
+            self.pending_completions.push(PendingCompletion {
+                id: post_inc(&mut self.completion_count),
+                _tasks: tasks,
+            });
+        }
+
+        user_messages
     }
 
     fn cancel_last_assist(&mut self) -> bool {
         self.pending_completions.pop().is_some()
     }
 
-    fn cycle_message_role(&mut self, id: MessageId, cx: &mut ModelContext<Self>) {
-        if let Some(metadata) = self.messages_metadata.get_mut(&id) {
-            metadata.role.cycle();
-            cx.emit(AssistantEvent::MessagesEdited);
-            cx.notify();
+    fn cycle_message_roles(&mut self, ids: HashSet<MessageId>, cx: &mut ModelContext<Self>) {
+        for id in ids {
+            if let Some(metadata) = self.messages_metadata.get_mut(&id) {
+                metadata.role.cycle();
+                cx.emit(AssistantEvent::MessagesEdited);
+                cx.notify();
+            }
         }
     }
 
@@ -687,6 +759,7 @@ impl Assistant {
         &mut self,
         message_id: MessageId,
         role: Role,
+        status: MessageStatus,
         cx: &mut ModelContext<Self>,
     ) -> Option<MessageAnchor> {
         if let Some(prev_message_ix) = self
@@ -713,7 +786,7 @@ impl Assistant {
                 MessageMetadata {
                     role,
                     sent_at: Local::now(),
-                    error: None,
+                    status,
                 },
             );
             cx.emit(AssistantEvent::MessagesEdited);
@@ -772,7 +845,7 @@ impl Assistant {
                 MessageMetadata {
                     role,
                     sent_at: Local::now(),
-                    error: None,
+                    status: MessageStatus::Done,
                 },
             );
 
@@ -814,7 +887,7 @@ impl Assistant {
                     MessageMetadata {
                         role,
                         sent_at: Local::now(),
-                        error: None,
+                        status: MessageStatus::Done,
                     },
                 );
                 (Some(selection), Some(suffix))
@@ -833,16 +906,19 @@ impl Assistant {
         if self.message_anchors.len() >= 2 && self.summary.is_none() {
             let api_key = self.api_key.borrow().clone();
             if let Some(api_key) = api_key {
-                let mut messages = self.open_ai_request_messages(cx);
-                messages.truncate(2);
-                messages.push(RequestMessage {
-                    role: Role::User,
-                    content: "Summarize the conversation into a short title without punctuation"
-                        .into(),
-                });
+                let messages = self
+                    .messages(cx)
+                    .take(2)
+                    .map(|message| message.to_open_ai_message(self.buffer.read(cx)))
+                    .chain(Some(RequestMessage {
+                        role: Role::User,
+                        content:
+                            "Summarize the conversation into a short title without punctuation"
+                                .into(),
+                    }));
                 let request = OpenAIRequest {
                     model: self.model.clone(),
-                    messages,
+                    messages: messages.collect(),
                     stream: true,
                 };
 
@@ -870,24 +946,39 @@ impl Assistant {
         }
     }
 
-    fn open_ai_request_messages(&self, cx: &AppContext) -> Vec<RequestMessage> {
-        let buffer = self.buffer.read(cx);
-        self.messages(cx)
-            .map(|message| RequestMessage {
-                role: message.role,
-                content: buffer.text_for_range(message.range).collect(),
-            })
-            .collect()
+    fn message_for_offset(&self, offset: usize, cx: &AppContext) -> Option<Message> {
+        self.messages_for_offsets([offset], cx).pop()
     }
 
-    fn message_for_offset<'a>(&'a self, offset: usize, cx: &'a AppContext) -> Option<Message> {
+    fn messages_for_offsets(
+        &self,
+        offsets: impl IntoIterator<Item = usize>,
+        cx: &AppContext,
+    ) -> Vec<Message> {
+        let mut result = Vec::new();
+
+        let buffer_len = self.buffer.read(cx).len();
         let mut messages = self.messages(cx).peekable();
-        while let Some(message) = messages.next() {
-            if message.range.contains(&offset) || messages.peek().is_none() {
-                return Some(message);
+        let mut offsets = offsets.into_iter().peekable();
+        while let Some(offset) = offsets.next() {
+            // Skip messages that start after the offset.
+            while messages.peek().map_or(false, |message| {
+                message.range.end < offset || (message.range.end == offset && offset < buffer_len)
+            }) {
+                messages.next();
+            }
+            let Some(message) = messages.peek() else { continue };
+
+            // Skip offsets that are in the same message.
+            while offsets.peek().map_or(false, |offset| {
+                message.range.contains(offset) || message.range.end == buffer_len
+            }) {
+                offsets.next();
             }
+
+            result.push(message.clone());
         }
-        None
+        result
     }
 
     fn messages<'a>(&'a self, cx: &'a AppContext) -> impl 'a + Iterator<Item = Message> {
@@ -916,7 +1007,7 @@ impl Assistant {
                     anchor: message_anchor.start,
                     role: metadata.role,
                     sent_at: metadata.sent_at,
-                    error: metadata.error.clone(),
+                    status: metadata.status.clone(),
                 });
             }
             None
@@ -926,7 +1017,7 @@ impl Assistant {
 
 struct PendingCompletion {
     id: usize,
-    _task: Task<()>,
+    _tasks: Vec<Task<()>>,
 }
 
 enum AssistantEditorEvent {
@@ -979,20 +1070,31 @@ impl AssistantEditor {
     }
 
     fn assist(&mut self, _: &Assist, cx: &mut ViewContext<Self>) {
-        let user_message = self.assistant.update(cx, |assistant, cx| {
-            let (_, user_message) = assistant.assist(cx)?;
-            Some(user_message)
+        let cursors = self.cursors(cx);
+
+        let user_messages = self.assistant.update(cx, |assistant, cx| {
+            let selected_messages = assistant
+                .messages_for_offsets(cursors, cx)
+                .into_iter()
+                .map(|message| message.id)
+                .collect();
+            assistant.assist(selected_messages, cx)
         });
-
-        if let Some(user_message) = user_message {
-            let cursor = user_message
-                .start
-                .to_offset(&self.assistant.read(cx).buffer.read(cx));
+        let new_selections = user_messages
+            .iter()
+            .map(|message| {
+                let cursor = message
+                    .start
+                    .to_offset(self.assistant.read(cx).buffer.read(cx));
+                cursor..cursor
+            })
+            .collect::<Vec<_>>();
+        if !new_selections.is_empty() {
             self.editor.update(cx, |editor, cx| {
                 editor.change_selections(
                     Some(Autoscroll::Strategy(AutoscrollStrategy::Fit)),
                     cx,
-                    |selections| selections.select_ranges([cursor..cursor]),
+                    |selections| selections.select_ranges(new_selections),
                 );
             });
         }
@@ -1008,14 +1110,25 @@ impl AssistantEditor {
     }
 
     fn cycle_message_role(&mut self, _: &CycleMessageRole, cx: &mut ViewContext<Self>) {
-        let cursor_offset = self.editor.read(cx).selections.newest(cx).head();
+        let cursors = self.cursors(cx);
         self.assistant.update(cx, |assistant, cx| {
-            if let Some(message) = assistant.message_for_offset(cursor_offset, cx) {
-                assistant.cycle_message_role(message.id, cx);
-            }
+            let messages = assistant
+                .messages_for_offsets(cursors, cx)
+                .into_iter()
+                .map(|message| message.id)
+                .collect();
+            assistant.cycle_message_roles(messages, cx)
         });
     }
 
+    fn cursors(&self, cx: &AppContext) -> Vec<usize> {
+        let selections = self.editor.read(cx).selections.all::<usize>(cx);
+        selections
+            .into_iter()
+            .map(|selection| selection.head())
+            .collect()
+    }
+
     fn handle_assistant_event(
         &mut self,
         _: ModelHandle<Assistant>,
@@ -1144,7 +1257,10 @@ impl AssistantEditor {
                                 let assistant = assistant.clone();
                                 move |_, _, cx| {
                                     assistant.update(cx, |assistant, cx| {
-                                        assistant.cycle_message_role(message_id, cx)
+                                        assistant.cycle_message_roles(
+                                            HashSet::from_iter(Some(message_id)),
+                                            cx,
+                                        )
                                     })
                                 }
                             });
@@ -1160,22 +1276,28 @@ impl AssistantEditor {
                                     .with_style(style.sent_at.container)
                                     .aligned(),
                                 )
-                                .with_children(message.error.as_ref().map(|error| {
-                                    Svg::new("icons/circle_x_mark_12.svg")
-                                        .with_color(style.error_icon.color)
-                                        .constrained()
-                                        .with_width(style.error_icon.width)
-                                        .contained()
-                                        .with_style(style.error_icon.container)
-                                        .with_tooltip::<ErrorTooltip>(
-                                            message_id.0,
-                                            error.to_string(),
-                                            None,
-                                            theme.tooltip.clone(),
-                                            cx,
+                                .with_children(
+                                    if let MessageStatus::Error(error) = &message.status {
+                                        Some(
+                                            Svg::new("icons/circle_x_mark_12.svg")
+                                                .with_color(style.error_icon.color)
+                                                .constrained()
+                                                .with_width(style.error_icon.width)
+                                                .contained()
+                                                .with_style(style.error_icon.container)
+                                                .with_tooltip::<ErrorTooltip>(
+                                                    message_id.0,
+                                                    error.to_string(),
+                                                    None,
+                                                    theme.tooltip.clone(),
+                                                    cx,
+                                                )
+                                                .aligned(),
                                         )
-                                        .aligned()
-                                }))
+                                    } else {
+                                        None
+                                    },
+                                )
                                 .aligned()
                                 .left()
                                 .contained()
@@ -1308,8 +1430,8 @@ impl AssistantEditor {
     fn cycle_model(&mut self, cx: &mut ViewContext<Self>) {
         self.assistant.update(cx, |assistant, cx| {
             let new_model = match assistant.model.as_str() {
-                "gpt-4" => "gpt-3.5-turbo",
-                _ => "gpt-4",
+                "gpt-4-0613" => "gpt-3.5-turbo-0613",
+                _ => "gpt-4-0613",
             };
             assistant.set_model(new_model.into(), cx);
         });
@@ -1423,7 +1545,14 @@ struct MessageAnchor {
 struct MessageMetadata {
     role: Role,
     sent_at: DateTime<Local>,
-    error: Option<Arc<str>>,
+    status: MessageStatus,
+}
+
+#[derive(Clone, Debug)]
+enum MessageStatus {
+    Pending,
+    Done,
+    Error(Arc<str>),
 }
 
 #[derive(Clone, Debug)]
@@ -1434,7 +1563,18 @@ pub struct Message {
     anchor: language::Anchor,
     role: Role,
     sent_at: DateTime<Local>,
-    error: Option<Arc<str>>,
+    status: MessageStatus,
+}
+
+impl Message {
+    fn to_open_ai_message(&self, buffer: &Buffer) -> RequestMessage {
+        let mut content = format!("[Message {}]\n", self.id.0).to_string();
+        content.extend(buffer.text_for_range(self.range.clone()));
+        RequestMessage {
+            role: self.role,
+            content,
+        }
+    }
 }
 
 async fn stream_completion(
@@ -1542,7 +1682,7 @@ mod tests {
 
         let message_2 = assistant.update(cx, |assistant, cx| {
             assistant
-                .insert_message_after(message_1.id, Role::Assistant, cx)
+                .insert_message_after(message_1.id, Role::Assistant, MessageStatus::Done, cx)
                 .unwrap()
         });
         assert_eq!(
@@ -1566,7 +1706,7 @@ mod tests {
 
         let message_3 = assistant.update(cx, |assistant, cx| {
             assistant
-                .insert_message_after(message_2.id, Role::User, cx)
+                .insert_message_after(message_2.id, Role::User, MessageStatus::Done, cx)
                 .unwrap()
         });
         assert_eq!(
@@ -1580,7 +1720,7 @@ mod tests {
 
         let message_4 = assistant.update(cx, |assistant, cx| {
             assistant
-                .insert_message_after(message_2.id, Role::User, cx)
+                .insert_message_after(message_2.id, Role::User, MessageStatus::Done, cx)
                 .unwrap()
         });
         assert_eq!(
@@ -1641,7 +1781,7 @@ mod tests {
         // Ensure we can still insert after a merged message.
         let message_5 = assistant.update(cx, |assistant, cx| {
             assistant
-                .insert_message_after(message_1.id, Role::System, cx)
+                .insert_message_after(message_1.id, Role::System, MessageStatus::Done, cx)
                 .unwrap()
         });
         assert_eq!(
@@ -1747,6 +1887,66 @@ mod tests {
         );
     }
 
+    #[gpui::test]
+    fn test_messages_for_offsets(cx: &mut AppContext) {
+        let registry = Arc::new(LanguageRegistry::test());
+        let assistant = cx.add_model(|cx| Assistant::new(Default::default(), registry, cx));
+        let buffer = assistant.read(cx).buffer.clone();
+
+        let message_1 = assistant.read(cx).message_anchors[0].clone();
+        assert_eq!(
+            messages(&assistant, cx),
+            vec![(message_1.id, Role::User, 0..0)]
+        );
+
+        buffer.update(cx, |buffer, cx| buffer.edit([(0..0, "aaa")], None, cx));
+        let message_2 = assistant
+            .update(cx, |assistant, cx| {
+                assistant.insert_message_after(message_1.id, Role::User, MessageStatus::Done, cx)
+            })
+            .unwrap();
+        buffer.update(cx, |buffer, cx| buffer.edit([(4..4, "bbb")], None, cx));
+
+        let message_3 = assistant
+            .update(cx, |assistant, cx| {
+                assistant.insert_message_after(message_2.id, Role::User, MessageStatus::Done, cx)
+            })
+            .unwrap();
+        buffer.update(cx, |buffer, cx| buffer.edit([(8..8, "ccc")], None, cx));
+
+        assert_eq!(buffer.read(cx).text(), "aaa\nbbb\nccc");
+        assert_eq!(
+            messages(&assistant, cx),
+            vec![
+                (message_1.id, Role::User, 0..4),
+                (message_2.id, Role::User, 4..8),
+                (message_3.id, Role::User, 8..11)
+            ]
+        );
+
+        assert_eq!(
+            message_ids_for_offsets(&assistant, &[0, 4, 9], cx),
+            [message_1.id, message_2.id, message_3.id]
+        );
+        assert_eq!(
+            message_ids_for_offsets(&assistant, &[0, 1, 11], cx),
+            [message_1.id, message_3.id]
+        );
+
+        fn message_ids_for_offsets(
+            assistant: &ModelHandle<Assistant>,
+            offsets: &[usize],
+            cx: &AppContext,
+        ) -> Vec<MessageId> {
+            assistant
+                .read(cx)
+                .messages_for_offsets(offsets.iter().copied(), cx)
+                .into_iter()
+                .map(|message| message.id)
+                .collect()
+        }
+    }
+
     fn messages(
         assistant: &ModelHandle<Assistant>,
         cx: &AppContext,