diff --git a/crates/project-model/src/cfg_flag.rs b/crates/project-model/src/cfg_flag.rs
index 2a4767970c0..c134b78ab3a 100644
--- a/crates/project-model/src/cfg_flag.rs
+++ b/crates/project-model/src/cfg_flag.rs
@@ -4,7 +4,6 @@
 use std::{fmt, str::FromStr};
 
 use cfg::CfgOptions;
-use serde::Serialize;
 
 #[derive(Clone, Eq, PartialEq, Debug)]
 pub enum CfgFlag {
@@ -39,18 +38,6 @@ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     }
 }
 
-impl Serialize for CfgFlag {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: serde::Serializer,
-    {
-        match self {
-            CfgFlag::Atom(s) => serializer.serialize_str(s),
-            CfgFlag::KeyValue { .. } => serializer.serialize_str(&format!("{}", &self)),
-        }
-    }
-}
-
 impl Extend<CfgFlag> for CfgOptions {
     fn extend<T: IntoIterator<Item = CfgFlag>>(&mut self, iter: T) {
         for cfg_flag in iter {
diff --git a/crates/project-model/src/project_json.rs b/crates/project-model/src/project_json.rs
index 0f779e5307e..4b2448e47f1 100644
--- a/crates/project-model/src/project_json.rs
+++ b/crates/project-model/src/project_json.rs
@@ -54,7 +54,7 @@
 use base_db::{CrateDisplayName, CrateId, CrateName, Dependency, Edition};
 use paths::{AbsPath, AbsPathBuf};
 use rustc_hash::FxHashMap;
-use serde::{de, ser, Deserialize, Serialize};
+use serde::{de, Deserialize};
 
 use crate::cfg_flag::CfgFlag;
 
@@ -171,14 +171,14 @@ pub fn path(&self) -> &AbsPath {
     }
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone)]
 pub struct ProjectJsonData {
     sysroot: Option<PathBuf>,
     sysroot_src: Option<PathBuf>,
     crates: Vec<CrateData>,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone)]
 struct CrateData {
     display_name: Option<String>,
     root_module: PathBuf,
@@ -200,7 +200,7 @@ struct CrateData {
     repository: Option<String>,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone)]
 #[serde(rename = "edition")]
 enum EditionData {
     #[serde(rename = "2015")]
@@ -221,16 +221,16 @@ fn from(data: EditionData) -> Self {
     }
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone)]
 struct DepData {
     /// Identifies a crate by position in the crates array.
     #[serde(rename = "crate")]
     krate: usize,
-    #[serde(deserialize_with = "deserialize_crate_name", serialize_with = "serialize_crate_name")]
+    #[serde(deserialize_with = "deserialize_crate_name")]
     name: CrateName,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Deserialize, Debug, Clone)]
 struct CrateSource {
     include_dirs: Vec<PathBuf>,
     exclude_dirs: Vec<PathBuf>,
@@ -243,10 +243,3 @@ fn deserialize_crate_name<'de, D>(de: D) -> Result<CrateName, D::Error>
     let name = String::deserialize(de)?;
     CrateName::new(&name).map_err(|err| de::Error::custom(format!("invalid crate name: {err:?}")))
 }
-
-fn serialize_crate_name<S>(crate_name: &CrateName, serializer: S) -> Result<S::Ok, S::Error>
-where
-    S: ser::Serializer,
-{
-    crate_name.serialize(serializer)
-}
diff --git a/crates/rust-analyzer/src/handlers.rs b/crates/rust-analyzer/src/handlers.rs
index 4ac76557df1..d7fc8891324 100644
--- a/crates/rust-analyzer/src/handlers.rs
+++ b/crates/rust-analyzer/src/handlers.rs
@@ -5,7 +5,6 @@
 use std::{
     io::Write as _,
     process::{self, Stdio},
-    sync::Arc,
 };
 
 use anyhow::Context;
@@ -53,21 +52,6 @@ pub(crate) fn handle_workspace_reload(state: &mut GlobalState, _: ()) -> Result<
     Ok(())
 }
 
-pub(crate) fn handle_add_project(
-    state: &mut GlobalState,
-    params: lsp_ext::AddProjectParams,
-) -> Result<()> {
-    state.proc_macro_clients.clear();
-    state.proc_macro_changed = false;
-
-    let config = Arc::make_mut(&mut state.config);
-    config.add_linked_projects(params.project);
-
-    state.fetch_workspaces_queue.request_op("linked projects changed".to_string());
-    state.fetch_build_data_queue.request_op("linked projects changed".to_string());
-    Ok(())
-}
-
 pub(crate) fn handle_cancel_flycheck(state: &mut GlobalState, _: ()) -> Result<()> {
     let _p = profile::span("handle_stop_flycheck");
     state.flycheck.iter().for_each(|flycheck| flycheck.cancel());
diff --git a/crates/rust-analyzer/src/lsp_ext.rs b/crates/rust-analyzer/src/lsp_ext.rs
index e6caebe3537..c7b513db981 100644
--- a/crates/rust-analyzer/src/lsp_ext.rs
+++ b/crates/rust-analyzer/src/lsp_ext.rs
@@ -9,7 +9,6 @@
     notification::Notification, CodeActionKind, DocumentOnTypeFormattingParams,
     PartialResultParams, Position, Range, TextDocumentIdentifier, WorkDoneProgressParams,
 };
-use project_model::ProjectJsonData;
 use serde::{Deserialize, Serialize};
 
 use crate::line_index::PositionEncoding;
@@ -52,20 +51,6 @@ impl Request for ReloadWorkspace {
     const METHOD: &'static str = "rust-analyzer/reloadWorkspace";
 }
 
-pub enum AddProject {}
-
-impl Request for AddProject {
-    type Params = AddProjectParams;
-    type Result = ();
-    const METHOD: &'static str = "rust-analyzer/addProject";
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-#[serde(rename_all = "camelCase")]
-pub struct AddProjectParams {
-    pub project: Vec<ProjectJsonData>,
-}
-
 pub enum SyntaxTree {}
 
 impl Request for SyntaxTree {
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 1cc771552a9..dd0804b4398 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -625,7 +625,6 @@ fn on_request(&mut self, req: Request) {
             .on_sync_mut::<lsp_ext::ReloadWorkspace>(handlers::handle_workspace_reload)
             .on_sync_mut::<lsp_ext::MemoryUsage>(handlers::handle_memory_usage)
             .on_sync_mut::<lsp_ext::ShuffleCrateGraph>(handlers::handle_shuffle_crate_graph)
-            .on_sync_mut::<lsp_ext::AddProject>(handlers::handle_add_project)
             .on_sync::<lsp_ext::JoinLines>(handlers::handle_join_lines)
             .on_sync::<lsp_ext::OnEnter>(handlers::handle_on_enter)
             .on_sync::<lsp_types::request::SelectionRangeRequest>(handlers::handle_selection_range)
diff --git a/editors/code/src/client.ts b/editors/code/src/client.ts
index 9103ef2f8fd..03f5d430519 100644
--- a/editors/code/src/client.ts
+++ b/editors/code/src/client.ts
@@ -3,7 +3,7 @@ import * as lc from "vscode-languageclient/node";
 import * as vscode from "vscode";
 import * as ra from "../src/lsp_ext";
 import * as Is from "vscode-languageclient/lib/common/utils/is";
-import { assert, log } from "./util";
+import { assert } from "./util";
 import * as diagnostics from "./diagnostics";
 import { WorkspaceEdit } from "vscode";
 import { Config, prepareVSCodeConfig } from "./config";
diff --git a/editors/code/src/lsp_ext.ts b/editors/code/src/lsp_ext.ts
index 942573c0f16..872d7199b83 100644
--- a/editors/code/src/lsp_ext.ts
+++ b/editors/code/src/lsp_ext.ts
@@ -43,9 +43,6 @@ export const relatedTests = new lc.RequestType<lc.TextDocumentPositionParams, Te
     "rust-analyzer/relatedTests"
 );
 export const reloadWorkspace = new lc.RequestType0<null, void>("rust-analyzer/reloadWorkspace");
-export const addProject = new lc.RequestType<AddProjectParams, string, void>(
-    "rust-analyzer/addProject"
-);
 
 export const runFlycheck = new lc.NotificationType<{
     textDocument: lc.TextDocumentIdentifier | null;
@@ -72,8 +69,6 @@ export const viewItemTree = new lc.RequestType<ViewItemTreeParams, string, void>
 
 export type AnalyzerStatusParams = { textDocument?: lc.TextDocumentIdentifier };
 
-export type AddProjectParams = { project: JsonProject[] };
-
 export type ExpandMacroParams = {
     textDocument: lc.TextDocumentIdentifier;
     position: lc.Position;