diff --git a/Cargo.lock b/Cargo.lock
index 92d56b0..0bc00e6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -540,7 +540,7 @@ dependencies = [
 
 [[package]]
 name = "protols"
-version = "0.11.1"
+version = "0.11.2"
 dependencies = [
  "async-lsp",
  "basic-toml",
diff --git a/Cargo.toml b/Cargo.toml
index bebc838..536da3e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "protols"
 description = "Language server for proto3 files"
-version = "0.11.1"
+version = "0.11.2"
 edition = "2024"
 license = "MIT"
 homepage = "https://github.com/coder3101/protols"
diff --git a/src/config/workspace.rs b/src/config/workspace.rs
index a6a293a..266791f 100644
--- a/src/config/workspace.rs
+++ b/src/config/workspace.rs
@@ -1,5 +1,6 @@
 use std::{
     collections::{HashMap, HashSet},
+    env,
     path::{Path, PathBuf},
 };
 
@@ -62,7 +63,7 @@ impl WorkspaceProtoConfigs {
         let wr: ProtolsConfig = basic_toml::from_str(&content).unwrap_or_default();
         let fmt = ClangFormatter::new(
             &wr.config.path.clang_format,
-            wpath.to_str().expect("non-utf8 path"),
+            Some(wpath.to_str().expect("non-utf8 path")),
         );
 
         self.workspaces.insert(w.uri.clone());
@@ -103,6 +104,34 @@ impl WorkspaceProtoConfigs {
         ipath.extend_from_slice(&self.protoc_include_prefix);
         Some(ipath)
     }
+
+    pub fn no_workspace_mode(&mut self) {
+        let wr = ProtolsConfig::default();
+        let rp = if cfg!(target_os = "windows") {
+            let mut d = String::from("C");
+            if let Ok(cdir) = env::current_dir() {
+                if let Some(drive) = cdir.components().next() {
+                    d = drive.as_os_str().to_string_lossy().to_string()
+                }
+            }
+            format!("{d}://")
+        } else {
+            String::from("/")
+        };
+        let uri = match Url::from_file_path(&rp) {
+            Err(err) => {
+                tracing::error!(?err, "failed to convert path: {rp} to Url");
+                return;
+            }
+            Ok(uri) => uri,
+        };
+
+        let fmt = ClangFormatter::new(&wr.config.path.clang_format, None);
+
+        self.workspaces.insert(uri.clone());
+        self.configs.insert(uri.clone(), wr);
+        self.formatters.insert(uri.clone(), fmt);
+    }
 }
 
 #[cfg(test)]
diff --git a/src/formatter/clang.rs b/src/formatter/clang.rs
index a051175..b9b56a1 100644
--- a/src/formatter/clang.rs
+++ b/src/formatter/clang.rs
@@ -16,7 +16,7 @@ use super::ProtoFormatter;
 
 pub struct ClangFormatter {
     pub path: String,
-    working_dir: String,
+    working_dir: Option<String>,
     temp_dir: TempDir,
 }
 
@@ -66,11 +66,11 @@ impl Replacement<'_> {
 }
 
 impl ClangFormatter {
-    pub fn new(cmd: &str, wdir: &str) -> Self {
+    pub fn new(cmd: &str, wdir: Option<&str>) -> Self {
         Self {
             temp_dir: tempdir().expect("faile to creat temp dir"),
             path: cmd.to_owned(),
-            working_dir: wdir.to_owned(),
+            working_dir: wdir.map(ToOwned::to_owned),
         }
     }
 
@@ -83,7 +83,9 @@ impl ClangFormatter {
 
     fn get_command(&self, f: &str, u: &Path) -> Option<Command> {
         let mut c = Command::new(self.path.as_str());
-        c.current_dir(self.working_dir.as_str());
+        if let Some(wd) = &self.working_dir {
+            c.current_dir(wd.as_str());
+        }
         c.stdin(File::open(u).ok()?);
         c.args([
             "--output-replacements-xml",
diff --git a/src/lsp.rs b/src/lsp.rs
index fdb91a1..6d665be 100644
--- a/src/lsp.rs
+++ b/src/lsp.rs
@@ -74,6 +74,9 @@ impl LanguageServer for ProtoLanguageServer {
                     ..Default::default()
                 }),
             })
+        } else {
+            tracing::info!("running in no workspace mode");
+            self.configs.no_workspace_mode()
         }
 
         let mut rename_provider: OneOf<bool, RenameOptions> = OneOf::Left(true);