diff --git a/packages/daemon/src/guest.js b/packages/daemon/src/guest.js
index ef6da3eca5..69635a554a 100644
--- a/packages/daemon/src/guest.js
+++ b/packages/daemon/src/guest.js
@@ -69,10 +69,11 @@ export const makeGuestMaker = ({
       terminator,
     });
 
-    const { list, follow: followNames } = petStore;
+    const { has, list, follow: followNames } = petStore;
 
     /** @type {import('@endo/eventual-send').ERef<import('./types.js').EndoGuest>} */
     const guest = Far('EndoGuest', {
+      has,
       lookup,
       reverseLookup,
       request,
diff --git a/packages/daemon/src/host.js b/packages/daemon/src/host.js
index 226f3e373c..6a8e7e2fa5 100644
--- a/packages/daemon/src/host.js
+++ b/packages/daemon/src/host.js
@@ -417,10 +417,11 @@ export const makeHostMaker = ({
       return value;
     };
 
-    const { list, follow: followNames } = petStore;
+    const { has, list, follow: followNames } = petStore;
 
     /** @type {import('./types.js').EndoHost} */
     const host = Far('EndoHost', {
+      has,
       lookup,
       reverseLookup,
       listMessages,