diff --git a/src/core/orchestrator.rs b/src/core/orchestrator.rs
index 7cfacf5..182e989 100644
--- a/src/core/orchestrator.rs
+++ b/src/core/orchestrator.rs
@@ -307,13 +307,13 @@ impl<P: ModelProvider> Orchestrator<P> {
     ///
     /// Matches on known tool names to extract structured fields; falls back to
     /// `Generic` with a JSON summary for anything else.
-    fn build_tool_display(&self, tool_name: &str, input: &serde_json::Value) -> ToolDisplay {
+    async fn build_tool_display(&self, tool_name: &str, input: &serde_json::Value) -> ToolDisplay {
         match tool_name {
             "write_file" => {
                 let path = input["path"].as_str().unwrap_or("<unknown>").to_string();
                 let new_content = input["content"].as_str().unwrap_or("").to_string();
                 // Try to read existing content for diffing.
-                let old_content = self.sandbox.read_file(&path).ok();
+                let old_content = self.sandbox.read_file(&path).await.ok();
                 ToolDisplay::WriteFile {
                     path,
                     old_content,
@@ -405,7 +405,7 @@ impl<P: ModelProvider> Orchestrator<P> {
             }
         };
 
-        let display = self.build_tool_display(tool_name, input);
+        let display = self.build_tool_display(tool_name, input).await;
 
         // Check approval.
         let approved = match risk {