diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 3ec2708880..da19f30103 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -1247,6 +1247,7 @@ version = "0.0.0"
 dependencies = [
  "serde_json",
  "thiserror 2.0.16",
+ "tokio",
 ]
 
 [[package]]
diff --git a/codex-rs/internal-storage/Cargo.toml b/codex-rs/internal-storage/Cargo.toml
index cd419326c8..ccc30337b9 100644
--- a/codex-rs/internal-storage/Cargo.toml
+++ b/codex-rs/internal-storage/Cargo.toml
@@ -6,6 +6,7 @@ edition.workspace = true
 [dependencies]
 serde_json = { workspace = true }
 thiserror = { workspace = true }
+tokio = { workspace = true, features = ["rt", "sync"] }
 
 [lints]
 workspace = true
diff --git a/codex-rs/internal-storage/src/lib.rs b/codex-rs/internal-storage/src/lib.rs
index 6a2efbaca5..5504626368 100644
--- a/codex-rs/internal-storage/src/lib.rs
+++ b/codex-rs/internal-storage/src/lib.rs
@@ -4,9 +4,11 @@ use std::fs;
 use std::io;
 use std::path::Path;
 use std::path::PathBuf;
-use std::sync::Mutex;
 use std::sync::OnceLock;
 use thiserror::Error;
+use tokio::runtime::Builder as RuntimeBuilder;
+use tokio::runtime::Handle as RuntimeHandle;
+use tokio::sync::Mutex;
 
 const INTERNAL_STORAGE_FILENAME: &str = "internal_storage.json";
 
@@ -58,14 +60,14 @@ impl Storage {
         Ok(())
     }
 
-    fn read(&self, key: &str) -> Result<Option<String>, InternalStorageError> {
-        let _guard = self.lock.lock().expect("internal storage lock poisoned");
+    async fn read_async(&self, key: &str) -> Result<Option<String>, InternalStorageError> {
+        let _guard = self.lock.lock().await;
         let map = self.read_map()?;
         Ok(map.get(key).map(value_to_string))
     }
 
-    fn write(&self, key: &str, value: &str) -> Result<(), InternalStorageError> {
-        let _guard = self.lock.lock().expect("internal storage lock poisoned");
+    async fn write_async(&self, key: &str, value: &str) -> Result<(), InternalStorageError> {
+        let _guard = self.lock.lock().await;
         let mut map = self.read_map()?;
         map.insert(key.to_string(), Value::String(value.to_string()));
         self.write_map(&map)
@@ -87,11 +89,19 @@ pub fn initialize(codex_home: PathBuf) {
 }
 
 pub fn read(key: &str) -> Result<Option<String>, InternalStorageError> {
-    storage()?.read(key)
+    let fut = storage()?.read_async(key);
+    match block_on(fut) {
+        Ok(res) => res,
+        Err(err) => Err(err.into()),
+    }
 }
 
 pub fn write(key: &str, value: &str) -> Result<(), InternalStorageError> {
-    storage()?.write(key, value)
+    let fut = storage()?.write_async(key, value);
+    match block_on(fut) {
+        Ok(res) => res,
+        Err(err) => Err(err.into()),
+    }
 }
 
 fn storage() -> Result<&'static Storage, InternalStorageError> {
@@ -111,3 +121,16 @@ fn value_to_string(value: &Value) -> String {
         _ => value.to_string(),
     }
 }
+
+fn block_on<F>(fut: F) -> Result<F::Output, io::Error>
+where
+    F: std::future::Future,
+{
+    match RuntimeHandle::try_current() {
+        Ok(handle) => Ok(handle.block_on(fut)),
+        Err(_) => {
+            let rt = RuntimeBuilder::new_current_thread().enable_all().build()?;
+            Ok(rt.block_on(fut))
+        }
+    }
+}