diff --git a/multichain-testing/test/chain-queries.test.ts b/multichain-testing/test/chain-queries.test.ts
index a9b91c97fe3..e739d0d53b6 100644
--- a/multichain-testing/test/chain-queries.test.ts
+++ b/multichain-testing/test/chain-queries.test.ts
@@ -247,6 +247,7 @@ test.serial('Send Local Query from chain object', async t => {
     },
   );
   const balanceProto3JsonQuery = typedJson(
+    // @ts-expect-error outdated cosmic-proto dep
     '/cosmos.bank.v1beta1.QueryBalanceRequest',
     {
       address: agoricAddr,
diff --git a/multichain-testing/tools/batchQuery.js b/multichain-testing/tools/batchQuery.js
index 64c1d1855b5..3d26c6037ad 100644
--- a/multichain-testing/tools/batchQuery.js
+++ b/multichain-testing/tools/batchQuery.js
@@ -1,3 +1,4 @@
+// @ts-check
 import { assert } from '@endo/errors';
 import { E } from '@endo/far';
 
diff --git a/multichain-testing/tools/e2e-tools.js b/multichain-testing/tools/e2e-tools.js
index ec0759d9232..a3c4ce4207c 100644
--- a/multichain-testing/tools/e2e-tools.js
+++ b/multichain-testing/tools/e2e-tools.js
@@ -1,3 +1,4 @@
+// @ts-check
 /** global harden */
 import { assert } from '@endo/errors';
 import { E, Far } from '@endo/far';
@@ -123,6 +124,7 @@ const installBundle = async (fullPath, opts) => {
  *   chainId?: string;
  *   whale?: string;
  *   progress?: typeof console.log;
+ *   q?: import('./queryKit.js').QueryTool;
  * }} opts
  */
 export const provisionSmartWallet = async (
@@ -474,6 +476,7 @@ export const makeE2ETools = async (
         // name,
         id: fullPath,
         installHeight: tx.height,
+        // @ts-expect-error confirm is a boolean?
         installed: confirm.installed,
       });
     }
diff --git a/multichain-testing/tools/makeHttpClient.js b/multichain-testing/tools/makeHttpClient.js
index 37344419946..3219a8f147e 100644
--- a/multichain-testing/tools/makeHttpClient.js
+++ b/multichain-testing/tools/makeHttpClient.js
@@ -1,3 +1,4 @@
+// @ts-check
 import { assert } from '@endo/errors';
 import { Far } from '@endo/far';
 
diff --git a/multichain-testing/tools/marshalTables.js b/multichain-testing/tools/marshalTables.js
index 827bd230cc3..ac06ed20f5d 100644
--- a/multichain-testing/tools/marshalTables.js
+++ b/multichain-testing/tools/marshalTables.js
@@ -1,3 +1,4 @@
+// @ts-check
 /**
  * @file marshal tools for vstorage clients
  *
diff --git a/multichain-testing/tools/queryKit.js b/multichain-testing/tools/queryKit.js
index 44bf5ac7f7a..3acdfb62f7f 100644
--- a/multichain-testing/tools/queryKit.js
+++ b/multichain-testing/tools/queryKit.js
@@ -1,3 +1,4 @@
+// @ts-check
 import { E, Far } from '@endo/far';
 import { batchVstorageQuery } from './batchQuery.js';
 import { makeClientMarshaller } from './marshalTables.js';