diff --git a/packages/inter-protocol/src/provisionPoolKit.js b/packages/inter-protocol/src/provisionPoolKit.js
index 4e1c71aa704..ee05ea5cc06 100644
--- a/packages/inter-protocol/src/provisionPoolKit.js
+++ b/packages/inter-protocol/src/provisionPoolKit.js
@@ -37,6 +37,15 @@ const FIRST_LOWER_NEAR_KEYWORD = /^[a-z][a-zA-Z0-9_$]*$/;
  * @import {Bank, BankManager} from '@agoric/vats/src/vat-bank.js'
  */
 
+// XXX when inferred, error TS2742: cannot be named without a reference to '../../../node_modules/@endo/exo/src/get-interface.js'. This is likely not portable. A type annotation is necessary.
+/**
+ * @typedef {{
+ *   machine: any;
+ *   helper: any;
+ *   public: any;
+ * }} ProvisionPoolKit
+ */
+
 /**
  * @typedef {import('@agoric/zoe/src/zoeService/utils.js').Instance<
  *   import('@agoric/inter-protocol/src/psm/psm.js').start
@@ -506,6 +515,7 @@ export const prepareProvisionPoolKit = (
    * @param {object} opts
    * @param {Brand<'nat'>} opts.poolBrand
    * @param {ERef<StorageNode>} opts.storageNode
+   * @returns {Promise<ProvisionPoolKit>}
    */
   const makeProvisionPoolKit = async ({ poolBrand, storageNode }) => {
     const fundPurse = await E(poolBank).getPurse(poolBrand);
diff --git a/packages/inter-protocol/test/psm/setupPsm.js b/packages/inter-protocol/test/psm/setupPsm.js
index f00a283c05b..895ff2679c6 100644
--- a/packages/inter-protocol/test/psm/setupPsm.js
+++ b/packages/inter-protocol/test/psm/setupPsm.js
@@ -100,8 +100,8 @@ export const setupPsm = async (
   brand.produce.IST.resolve(istBrand);
   issuer.produce.IST.resolve(istIssuer);
 
+  // @ts-expect-error mock
   space.produce.provisionPoolStartResult.resolve({
-    // @ts-expect-error mock
     creatorFacet: Far('dummy', {
       initPSM: () => {
         t.log('dummy provisionPool.initPSM');