diff --git a/crates/editor2/src/display_map.rs b/crates/editor2/src/display_map.rs
index 60975a7a5c..dde063dab2 100644
--- a/crates/editor2/src/display_map.rs
+++ b/crates/editor2/src/display_map.rs
@@ -997,6 +997,7 @@ pub mod tests {
         movement,
         test::{editor_test_context::EditorTestContext, marked_display_snapshot},
     };
+    use client::Client;
     use gpui::{div, font, observe, px, AppContext, Context, Element, Hsla};
     use language::{
         language_settings::{AllLanguageSettings, AllLanguageSettingsContent},
@@ -1008,7 +1009,10 @@ pub mod tests {
     use smol::stream::StreamExt;
     use std::{env, sync::Arc};
     use theme::{LoadThemes, SyntaxTheme};
-    use util::test::{marked_text_ranges, sample_text};
+    use util::{
+        http::FakeHttpClient,
+        test::{marked_text_ranges, sample_text},
+    };
     use Bias::*;
 
     #[gpui::test(iterations = 100)]
diff --git a/crates/editor2/src/editor.rs b/crates/editor2/src/editor.rs
index 4912e1aa11..907a2e2153 100644
--- a/crates/editor2/src/editor.rs
+++ b/crates/editor2/src/editor.rs
@@ -13,6 +13,7 @@ mod link_go_to_definition;
 mod mouse_context_menu;
 pub mod movement;
 mod persistence;
+mod rust_analyzer_ext;
 pub mod scroll;
 pub mod selections_collection;
 
@@ -73,7 +74,7 @@ pub use multi_buffer::{
 use ordered_float::OrderedFloat;
 use parking_lot::{Mutex, RwLock};
 use project::{FormatTrigger, Location, Project, ProjectPath, ProjectTransaction};
-use rand::prelude::*;
+use rand::{prelude::*, rngs::adapter};
 use rpc::proto::{self, *};
 use scroll::{
     autoscroll::Autoscroll, OngoingScroll, ScrollAnchor, ScrollManager, ScrollbarAutoHide,
@@ -107,7 +108,7 @@ use ui::{
 use ui::{prelude::*, IconSize};
 use util::{post_inc, RangeExt, ResultExt, TryFutureExt};
 use workspace::{
-    item::{ItemEvent, ItemHandle},
+    item::{Item, ItemEvent, ItemHandle},
     searchable::SearchEvent,
     ItemNavHistory, Pane, SplitDirection, ViewId, Workspace,
 };
@@ -329,6 +330,7 @@ actions!(
         DeleteToPreviousSubwordStart,
         DeleteToPreviousWordStart,
         DuplicateLine,
+        ExpandMacroRecursively,
         FindAllReferences,
         Fold,
         FoldSelectedRanges,
diff --git a/crates/editor2/src/editor_tests.rs b/crates/editor2/src/editor_tests.rs
index 2548fc40a4..193ea5bc4b 100644
--- a/crates/editor2/src/editor_tests.rs
+++ b/crates/editor2/src/editor_tests.rs
@@ -29,6 +29,7 @@ use std::{cell::RefCell, future::Future, rc::Rc, time::Instant};
 use unindent::Unindent;
 use util::{
     assert_set_eq,
+    http::FakeHttpClient,
     test::{marked_text_ranges, marked_text_ranges_by, sample_text, TextRangeMarker},
 };
 use workspace::{
diff --git a/crates/editor2/src/element.rs b/crates/editor2/src/element.rs
index fb7d84e173..4e444ee189 100644
--- a/crates/editor2/src/element.rs
+++ b/crates/editor2/src/element.rs
@@ -32,7 +32,7 @@ use gpui::{
     Style, Styled, TextRun, TextStyle, View, ViewContext, WeakView, WindowContext, WrappedLine,
 };
 use itertools::Itertools;
-use language::language_settings::ShowWhitespaceSetting;
+use language::{language_settings::ShowWhitespaceSetting, Language};
 use multi_buffer::Anchor;
 use project::{
     project_settings::{GitGutterSetting, ProjectSettings},
@@ -135,11 +135,13 @@ impl EditorElement {
 
     fn register_actions(&self, cx: &mut WindowContext) {
         let view = &self.editor;
-        self.editor.update(cx, |editor, cx| {
+        view.update(cx, |editor, cx| {
             for action in editor.editor_actions.iter() {
                 (action)(cx)
             }
         });
+
+        crate::rust_analyzer_ext::apply_related_actions(view, cx);
         register_action(view, cx, Editor::move_left);
         register_action(view, cx, Editor::move_right);
         register_action(view, cx, Editor::move_down);
diff --git a/crates/editor2/src/inlay_hint_cache.rs b/crates/editor2/src/inlay_hint_cache.rs
index aab985ff90..32c4f5b61f 100644
--- a/crates/editor2/src/inlay_hint_cache.rs
+++ b/crates/editor2/src/inlay_hint_cache.rs
@@ -1202,6 +1202,7 @@ pub mod tests {
         scroll::{autoscroll::Autoscroll, scroll_amount::ScrollAmount},
         ExcerptRange,
     };
+    use client::Client;
     use futures::StreamExt;
     use gpui::{Context, TestAppContext, View, WindowHandle};
     use itertools::Itertools;
@@ -1214,6 +1215,7 @@ pub mod tests {
     use serde_json::json;
     use settings::SettingsStore;
     use text::{Point, ToPoint};
+    use util::http::FakeHttpClient;
     use workspace::Workspace;
 
     use crate::editor_tests::update_test_language_settings;
diff --git a/crates/editor2/src/movement.rs b/crates/editor2/src/movement.rs
index ab25bb8499..0f92f37fd8 100644
--- a/crates/editor2/src/movement.rs
+++ b/crates/editor2/src/movement.rs
@@ -460,10 +460,11 @@ mod tests {
         test::{editor_test_context::EditorTestContext, marked_display_snapshot},
         Buffer, DisplayMap, ExcerptRange, InlayId, MultiBuffer,
     };
+    use client::Client;
     use gpui::{font, Context as _};
     use project::Project;
     use settings::SettingsStore;
-    use util::post_inc;
+    use util::{http::FakeHttpClient, post_inc};
 
     #[gpui::test]
     fn test_previous_word_start(cx: &mut gpui::AppContext) {
diff --git a/crates/editor2/src/rust_analyzer_ext.rs b/crates/editor2/src/rust_analyzer_ext.rs
new file mode 100644
index 0000000000..e484136e49
--- /dev/null
+++ b/crates/editor2/src/rust_analyzer_ext.rs
@@ -0,0 +1,75 @@
+use std::{path::Path, sync::Arc};
+
+use gpui::{AppContext, AsyncAppContext, Model, View, ViewContext, WindowContext};
+use language::Buffer;
+use lsp::{LanguageServer, LanguageServerId};
+use project::{lsp_command::LspCommand, lsp_ext_command::ExpandMacro, Project};
+use rpc::proto::{self, PeerId};
+use serde::{Deserialize, Serialize};
+
+use crate::{element::register_action, Editor, ExpandMacroRecursively};
+
+pub fn apply_related_actions(editor: &View<Editor>, cx: &mut WindowContext) {
+    let is_rust_related = editor.update(cx, |editor, cx| {
+        editor
+            .buffer()
+            .read(cx)
+            .all_buffers()
+            .iter()
+            .any(|b| b.read(cx).language().map(|l| l.name()).as_deref() == Some("Rust"))
+    });
+
+    if is_rust_related {
+        register_action(editor, cx, expand_macro_recursively);
+    }
+}
+
+pub fn expand_macro_recursively(
+    editor: &mut Editor,
+    _: &ExpandMacroRecursively,
+    cx: &mut ViewContext<'_, Editor>,
+) {
+    if editor.selections.count() == 0 {
+        return;
+    }
+    let Some(project) = &editor.project else {
+        return;
+    };
+
+    let multibuffer = editor.buffer().read(cx);
+
+    let Some((trigger_anchor, server_to_query, buffer)) = editor
+        .selections
+        .disjoint_anchors()
+        .into_iter()
+        .filter(|selection| selection.start == selection.end)
+        .filter_map(|selection| Some((selection.start.buffer_id?, selection.start)))
+        .find_map(|(buffer_id, trigger_anchor)| {
+            let buffer = multibuffer.buffer(buffer_id)?;
+            project
+                .read(cx)
+                .language_servers_for_buffer(buffer.read(cx), cx)
+                .into_iter()
+                .find_map(|(adapter, server)| {
+                    if adapter.name.0.as_ref() == "rust-analyzer" {
+                        Some((trigger_anchor, server.server_id(), buffer.clone()))
+                    } else {
+                        None
+                    }
+                })
+        })
+    else {
+        return;
+    };
+
+    let z = project.update(cx, |project, cx| {
+        project.request_lsp(
+            buffer,
+            project::LanguageServerToQuery::Other(server_to_query),
+            ExpandMacro {},
+            cx,
+        )
+    });
+
+    // todo!("TODO kb")
+}
diff --git a/crates/editor2/src/test/editor_lsp_test_context.rs b/crates/editor2/src/test/editor_lsp_test_context.rs
index 7ee55cddba..53540fb505 100644
--- a/crates/editor2/src/test/editor_lsp_test_context.rs
+++ b/crates/editor2/src/test/editor_lsp_test_context.rs
@@ -5,7 +5,9 @@ use std::{
 };
 
 use anyhow::Result;
+use client::Client;
 use serde_json::json;
+use util::http::FakeHttpClient;
 
 use crate::{Editor, ToPoint};
 use collections::HashSet;
diff --git a/crates/project2/src/lsp_command.rs b/crates/project2/src/lsp_command.rs
index a2de52b21a..52836f4c00 100644
--- a/crates/project2/src/lsp_command.rs
+++ b/crates/project2/src/lsp_command.rs
@@ -33,7 +33,7 @@ pub fn lsp_formatting_options(tab_size: u32) -> lsp::FormattingOptions {
 }
 
 #[async_trait(?Send)]
-pub(crate) trait LspCommand: 'static + Sized + Send {
+pub trait LspCommand: 'static + Sized + Send {
     type Response: 'static + Default + Send;
     type LspRequest: 'static + Send + lsp::request::Request;
     type ProtoRequest: 'static + Send + proto::RequestMessage;
diff --git a/crates/project2/src/lsp_ext_command.rs b/crates/project2/src/lsp_ext_command.rs
new file mode 100644
index 0000000000..63a782df51
--- /dev/null
+++ b/crates/project2/src/lsp_ext_command.rs
@@ -0,0 +1,100 @@
+use std::{path::Path, sync::Arc};
+
+use async_trait::async_trait;
+use gpui::{AppContext, AsyncAppContext, Model};
+use language::Buffer;
+use lsp::{LanguageServer, LanguageServerId};
+use rpc::proto::{self, PeerId};
+use serde::{Deserialize, Serialize};
+
+use crate::{lsp_command::LspCommand, Project};
+
+pub enum LspExpandMacro {}
+
+impl lsp::request::Request for LspExpandMacro {
+    type Params = ExpandMacroParams;
+    type Result = Option<ExpandedMacro>;
+    const METHOD: &'static str = "rust-analyzer/expandMacro";
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct ExpandMacroParams {
+    pub text_document: lsp::TextDocumentIdentifier,
+    pub position: lsp::Position,
+}
+
+#[derive(Default, Deserialize, Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct ExpandedMacro {
+    pub name: String,
+    pub expansion: String,
+}
+
+pub struct ExpandMacro {}
+
+// TODO kb
+#[async_trait(?Send)]
+impl LspCommand for ExpandMacro {
+    type Response = ExpandedMacro;
+    type LspRequest = LspExpandMacro;
+    type ProtoRequest = proto::LspExtExpandMacro;
+
+    fn to_lsp(
+        &self,
+        path: &Path,
+        buffer: &Buffer,
+        language_server: &Arc<LanguageServer>,
+        cx: &AppContext,
+    ) -> ExpandMacroParams {
+        todo!()
+    }
+
+    async fn response_from_lsp(
+        self,
+        message: Option<ExpandedMacro>,
+        project: Model<Project>,
+        buffer: Model<Buffer>,
+        server_id: LanguageServerId,
+        cx: AsyncAppContext,
+    ) -> anyhow::Result<ExpandedMacro> {
+        anyhow::bail!("TODO kb")
+    }
+
+    fn to_proto(&self, project_id: u64, buffer: &Buffer) -> proto::LspExtExpandMacro {
+        todo!()
+    }
+
+    async fn from_proto(
+        message: Self::ProtoRequest,
+        project: Model<Project>,
+        buffer: Model<Buffer>,
+        cx: AsyncAppContext,
+    ) -> anyhow::Result<Self> {
+        todo!()
+    }
+
+    fn response_to_proto(
+        response: ExpandedMacro,
+        project: &mut Project,
+        peer_id: PeerId,
+        buffer_version: &clock::Global,
+        cx: &mut AppContext,
+    ) -> proto::LspExtExpandMacroResponse {
+        todo!()
+    }
+
+    async fn response_from_proto(
+        self,
+        message: proto::LspExtExpandMacroResponse,
+        project: Model<Project>,
+        buffer: Model<Buffer>,
+        cx: AsyncAppContext,
+    ) -> anyhow::Result<ExpandedMacro> {
+        todo!()
+    }
+
+    fn buffer_id_from_proto(message: &proto::LspExtExpandMacro) -> u64 {
+        message.buffer_id
+    }
+}
diff --git a/crates/project2/src/project2.rs b/crates/project2/src/project2.rs
index 243f896b0f..fe3498b930 100644
--- a/crates/project2/src/project2.rs
+++ b/crates/project2/src/project2.rs
@@ -1,5 +1,6 @@
 mod ignore;
-mod lsp_command;
+pub mod lsp_command;
+pub mod lsp_ext_command;
 mod prettier_support;
 pub mod project_settings;
 pub mod search;
@@ -172,7 +173,7 @@ struct DelayedDebounced {
     cancel_channel: Option<oneshot::Sender<()>>,
 }
 
-enum LanguageServerToQuery {
+pub enum LanguageServerToQuery {
     Primary,
     Other(LanguageServerId),
 }
@@ -623,6 +624,7 @@ impl Project {
         client.add_model_request_handler(Self::handle_open_buffer_by_path);
         client.add_model_request_handler(Self::handle_save_buffer);
         client.add_model_message_handler(Self::handle_update_diff_base);
+        client.add_model_request_handler(Self::handle_lsp_command::<lsp_ext_command::ExpandMacro>);
     }
 
     pub fn local(
@@ -5933,7 +5935,7 @@ impl Project {
             .await;
     }
 
-    fn request_lsp<R: LspCommand>(
+    pub fn request_lsp<R: LspCommand>(
         &self,
         buffer_handle: Model<Buffer>,
         server: LanguageServerToQuery,
diff --git a/crates/rpc2/proto/zed.proto b/crates/rpc2/proto/zed.proto
index 611514aacb..0ddeb05377 100644
--- a/crates/rpc2/proto/zed.proto
+++ b/crates/rpc2/proto/zed.proto
@@ -178,7 +178,9 @@ message Envelope {
         GetNotifications get_notifications = 150;
         GetNotificationsResponse get_notifications_response = 151;
         DeleteNotification delete_notification = 152;
-        MarkNotificationRead mark_notification_read = 153; // Current max
+        MarkNotificationRead mark_notification_read = 153;
+        LspExtExpandMacro lsp_ext_expand_macro = 154;
+        LspExtExpandMacroResponse lsp_ext_expand_macro_response = 155; // Current max
     }
 }
 
@@ -1619,3 +1621,11 @@ message Notification {
     bool is_read = 6;
     optional bool response = 7;
 }
+
+message LspExtExpandMacro {
+    uint64 project_id = 1;
+    uint64 buffer_id = 2;
+}
+
+message LspExtExpandMacroResponse {
+}
diff --git a/crates/rpc2/src/proto.rs b/crates/rpc2/src/proto.rs
index 77a69122c2..336c252630 100644
--- a/crates/rpc2/src/proto.rs
+++ b/crates/rpc2/src/proto.rs
@@ -280,6 +280,8 @@ messages!(
     (UpdateWorktree, Foreground),
     (UpdateWorktreeSettings, Foreground),
     (UsersResponse, Foreground),
+    (LspExtExpandMacro, Background),
+    (LspExtExpandMacroResponse, Background),
 );
 
 request_messages!(
@@ -363,6 +365,7 @@ request_messages!(
     (UpdateParticipantLocation, Ack),
     (UpdateProject, Ack),
     (UpdateWorktree, Ack),
+    (LspExtExpandMacro, LspExtExpandMacroResponse),
 );
 
 entity_messages!(
@@ -415,6 +418,7 @@ entity_messages!(
     UpdateProjectCollaborator,
     UpdateWorktree,
     UpdateWorktreeSettings,
+    LspExtExpandMacro,
 );
 
 entity_messages!(