diff --git a/codex-rs/app-server-protocol/src/protocol/common.rs b/codex-rs/app-server-protocol/src/protocol/common.rs
index f7faae2f4a..e1a11ae370 100644
--- a/codex-rs/app-server-protocol/src/protocol/common.rs
+++ b/codex-rs/app-server-protocol/src/protocol/common.rs
@@ -951,7 +951,7 @@ client_request_definitions! {
 
     ConfigRead => "config/read" {
         params: v2::ConfigReadParams,
-        serialization: global("config"),
+        serialization: global_shared_read("config"),
         response: v2::ConfigReadResponse,
     },
     ExternalAgentConfigDetect => "externalAgentConfig/detect" {
@@ -1731,7 +1731,7 @@ mod tests {
         };
         assert_eq!(
             config_read.serialization_scope(),
-            Some(ClientRequestSerializationScope::Global("config"))
+            Some(ClientRequestSerializationScope::GlobalSharedRead("config"))
         );
 
         let account_read = ClientRequest::GetAccount {