diff --git a/codex-rs/cli/src/main.rs b/codex-rs/cli/src/main.rs
index 03a81f9b7e..45218a6d39 100644
--- a/codex-rs/cli/src/main.rs
+++ b/codex-rs/cli/src/main.rs
@@ -1179,6 +1179,9 @@ async fn cli_main(
             codex_exec::run_main(exec_cli, arg0_paths.clone()).await?;
         }
         Some(Subcommand::McpServer(McpServerCommand { strict_config })) => {
+            eprintln!(
+                "warning: `codex mcp-server` is deprecated and will be removed in a future release."
+            );
             reject_remote_mode_for_subcommand(
                 root_remote.as_deref(),
                 root_remote_auth_token_env.as_deref(),