diff --git a/src/nix/modules/service/context.nix b/src/nix/modules/service/context.nix
index 10854e2..f80eaa3 100644
--- a/src/nix/modules/service/context.nix
+++ b/src/nix/modules/service/context.nix
@@ -3,12 +3,14 @@
   options = {
     host = lib.mkOption {
       type = lib.types.attrs;
+      readOnly = true;
       description = ''
         The composition-level host option values.
       '';
     };
     composition = lib.mkOption {
       type = lib.types.attrs;
+      readOnly = true;
       description = ''
         The composition configuration.
       '';