diff --git a/packages/boot/package.json b/packages/boot/package.json
index 13b607a386c..d0238a737a4 100644
--- a/packages/boot/package.json
+++ b/packages/boot/package.json
@@ -21,6 +21,7 @@
   "dependencies": {
     "@endo/errors": "^1.2.7",
     "@agoric/builders": "^0.1.0",
+    "@agoric/client-utils": "^0.1.0",
     "@agoric/cosmic-proto": "^0.4.0",
     "@agoric/cosmic-swingset": "^0.41.3",
     "@agoric/ertp": "^0.16.2",
diff --git a/packages/boot/tools/supports.ts b/packages/boot/tools/supports.ts
index 8b4a810f799..c59f050f294 100644
--- a/packages/boot/tools/supports.ts
+++ b/packages/boot/tools/supports.ts
@@ -8,6 +8,7 @@ import { basename, join } from 'path';
 import { inspect } from 'util';
 
 import { buildSwingset } from '@agoric/cosmic-swingset/src/launch-chain.js';
+import type { TypedPublished } from '@agoric/client-utils';
 import {
   BridgeId,
   makeTracer,
@@ -336,6 +337,9 @@ export const makeSwingsetTestKit = async (
     return data;
   };
 
+  const readPublished = <T extends string>(subpath: T) =>
+    readLatest(`published.${subpath}`) as TypedPublished<T>;
+
   let lastBankNonce = 0n;
   let ibcSequenceNonce = 0;
   let lcaSequenceNonce = 0;
@@ -645,6 +649,7 @@ export const makeSwingsetTestKit = async (
     getCrankNumber,
     jumpTimeTo,
     readLatest,
+    readPublished,
     runUtils,
     shutdown,
     storage,