diff --git a/packages/async-flow/package.json b/packages/async-flow/package.json
index eeb9ae506de..90e41161022 100644
--- a/packages/async-flow/package.json
+++ b/packages/async-flow/package.json
@@ -61,6 +61,6 @@
     "workerThreads": false
   },
   "typeCoverage": {
-    "atLeast": 77.01
+    "atLeast": 77.1
   }
 }
diff --git a/packages/async-flow/src/types.d.ts b/packages/async-flow/src/types.d.ts
index 114ae65aa51..a2d28b6c7ef 100644
--- a/packages/async-flow/src/types.d.ts
+++ b/packages/async-flow/src/types.d.ts
@@ -46,11 +46,18 @@ export type GuestOf<F extends HostAsyncFuncWrapper> = F extends (
   ? (...args: A) => Promise<R>
   : F;
 
+// from https://github.com/sindresorhus/type-fest/blob/main/source/simplify.d.ts
+type Simplify<T> = { [KeyType in keyof T]: T[KeyType] } & {};
+
 /**
  * Convert an entire Guest interface into what the host will implement.
  */
 type HostInterface<T> = {
-  [K in keyof T]: HostOf<T[K]>;
+  [K in keyof T]: T[K] extends CallableFunction
+    ? HostOf<T[K]>
+    : T[K] extends Record<string, any>
+      ? Simplify<HostInterface<T[K]>>
+      : T[K];
 };
 
 /**
@@ -71,8 +78,12 @@ export type GuestInterface<T> = {
  *
  * Specifically, Promise return values are converted to Vows.
  */
-export type HostOf<F> = F extends (...args: infer A) => Promise<infer R>
-  ? (...args: A) => Vow<R extends Passable ? R : HostInterface<R>>
+export type HostOf<F extends CallableFunction> = F extends (
+  ...args: infer A
+) => infer R
+  ? R extends Promise<infer T>
+    ? (...args: A) => Vow<T extends Passable ? T : HostInterface<T>>
+    : (...args: A) => HostInterface<R>
   : F;
 
 export type HostArgs<GA extends any[]> = { [K in keyof GA]: HostOf<GA[K]> };
diff --git a/packages/notifier/src/notifier.js b/packages/notifier/src/notifier.js
index 9439bbf528f..3c6ce35f19f 100644
--- a/packages/notifier/src/notifier.js
+++ b/packages/notifier/src/notifier.js
@@ -7,6 +7,7 @@ import { makePublishKit } from './publish-kit.js';
 import { subscribeLatest } from './subscribe.js';
 
 /**
+ * @import {Remote} from '@agoric/internal';
  * @import {LatestTopic, Notifier, NotifierRecord, PublishKit, Subscriber, UpdateRecord} from './types.js';
  */
 
@@ -41,7 +42,7 @@ export const makeNotifier = sharableInternalsP => {
 
 /**
  * @template T
- * @param {ERef<Subscriber<T>>} subscriber
+ * @param {ERef<Subscriber<T>> | Remote<Subscriber<T>>} subscriber
  * @returns {Notifier<T>}
  */
 export const makeNotifierFromSubscriber = subscriber => {
diff --git a/packages/orchestration/package.json b/packages/orchestration/package.json
index d2c37ec1d18..41c57cd6d3f 100644
--- a/packages/orchestration/package.json
+++ b/packages/orchestration/package.json
@@ -92,6 +92,6 @@
     "access": "public"
   },
   "typeCoverage": {
-    "atLeast": 98.05
+    "atLeast": 98.1
   }
 }
diff --git a/packages/orchestration/src/examples/stakeIca.contract.js b/packages/orchestration/src/examples/stakeIca.contract.js
index e40485d93ae..af8eeeac585 100644
--- a/packages/orchestration/src/examples/stakeIca.contract.js
+++ b/packages/orchestration/src/examples/stakeIca.contract.js
@@ -17,6 +17,7 @@ const trace = makeTracer('StakeIca');
  * @import {Baggage} from '@agoric/vat-data';
  * @import {IBCConnectionID} from '@agoric/vats';
  * @import {TimerService} from '@agoric/time';
+ * @import {ResolvedContinuingOfferResult} from '../utils/zoe-tools.js';
  * @import {ICQConnection, CosmosInterchainService} from '../types.js';
  */
 
@@ -129,10 +130,15 @@ export const start = async (zcf, privateArgs, baggage) => {
       makeAccountInvitationMaker() {
         trace('makeCreateAccountInvitation');
         return zcf.makeInvitation(
+          // XXX use `orchestrate` membrane for vow?
+          /**
+           * @param {ZCFSeat} seat
+           * @returns {Promise<ResolvedContinuingOfferResult>}
+           */
           async seat => {
             seat.exit();
             const holder = await makeAccountKit();
-            return holder.asContinuingOffer();
+            return vowTools.when(holder.asContinuingOffer());
           },
           'wantStakingAccount',
           undefined,
diff --git a/packages/orchestration/src/exos/chain-hub.js b/packages/orchestration/src/exos/chain-hub.js
index 24b280085b3..ea47e5f2f67 100644
--- a/packages/orchestration/src/exos/chain-hub.js
+++ b/packages/orchestration/src/exos/chain-hub.js
@@ -18,9 +18,11 @@ import { CosmosChainInfoShape, IBCConnectionInfoShape } from '../typeGuards.js';
  */
 
 /**
+ * If K matches a known chain, narrow the type from generic ChainInfo
+ *
  * @template {string} K
  * @typedef {K extends keyof KnownChains
- *   ? Omit<KnownChains[K], 'connections'>
+ *   ? ChainInfo & Omit<KnownChains[K], 'connections'>
  *   : ChainInfo} ActualChainInfo
  */
 
diff --git a/packages/orchestration/src/exos/cosmos-orchestration-account.js b/packages/orchestration/src/exos/cosmos-orchestration-account.js
index 50293b4253a..08bac4861d9 100644
--- a/packages/orchestration/src/exos/cosmos-orchestration-account.js
+++ b/packages/orchestration/src/exos/cosmos-orchestration-account.js
@@ -312,6 +312,7 @@ export const prepareCosmosOrchestrationAccountKit = (
       holder: {
         /** @type {HostOf<OrchestrationAccountI['asContinuingOffer']>} */
         asContinuingOffer() {
+          // @ts-expect-error XXX invitationMakers
           // getPublicTopics resolves promptly (same run), so we don't need a watcher
           // eslint-disable-next-line no-restricted-syntax
           return asVow(async () => {
diff --git a/packages/orchestration/src/exos/local-orchestration-account.js b/packages/orchestration/src/exos/local-orchestration-account.js
index c25b675d5ac..450fbe3cbe4 100644
--- a/packages/orchestration/src/exos/local-orchestration-account.js
+++ b/packages/orchestration/src/exos/local-orchestration-account.js
@@ -293,6 +293,7 @@ export const prepareLocalOrchestrationAccountKit = (
       holder: {
         /** @type {HostOf<OrchestrationAccountI['asContinuingOffer']>} */
         asContinuingOffer() {
+          // @ts-expect-error XXX invitationMakers
           // getPublicTopics resolves promptly (same run), so we don't need a watcher
           // eslint-disable-next-line no-restricted-syntax
           return asVow(async () => {
diff --git a/packages/orchestration/src/exos/orchestrator.js b/packages/orchestration/src/exos/orchestrator.js
index 397e68a3442..10ed1daf665 100644
--- a/packages/orchestration/src/exos/orchestrator.js
+++ b/packages/orchestration/src/exos/orchestrator.js
@@ -16,7 +16,7 @@ import {
 
 /**
  * @import {Zone} from '@agoric/base-zone';
- * @import {ChainHub} from './chain-hub.js';
+ * @import {ActualChainInfo, ChainHub} from './chain-hub.js';
  * @import {AsyncFlowTools, HostInterface, HostOf} from '@agoric/async-flow';
  * @import {Vow, VowTools} from '@agoric/vow';
  * @import {TimerService} from '@agoric/time';
@@ -75,14 +75,14 @@ const prepareOrchestratorKit = (
     {
       orchestrator: OrchestratorI,
       makeLocalChainFacadeWatcher: M.interface('makeLocalChainFacadeWatcher', {
-        onFulfilled: M.call(M.record(), M.string()).returns(M.any()), // FIXME narrow
+        onFulfilled: M.call(M.record()).returns(M.remotable()),
       }),
       makeRemoteChainFacadeWatcher: M.interface(
         'makeRemoteChainFacadeWatcher',
         {
           onFulfilled: M.call(M.any(), M.string())
             .optional(M.arrayOf(M.undefined())) // XXX needed?
-            .returns(M.any()), // FIXME narrow
+            .returns(M.remotable()),
         },
       ),
     },
@@ -94,12 +94,11 @@ const prepareOrchestratorKit = (
       /** Waits for `chainInfo` and returns a LocalChainFacade */
       makeLocalChainFacadeWatcher: {
         /**
-         * @param {ChainInfo} agoricChainInfo
-         * @param {string} name
+         * @param {ActualChainInfo<'agoric'>} agoricChainInfo
          */
-        onFulfilled(agoricChainInfo, name) {
+        onFulfilled(agoricChainInfo) {
           const it = makeLocalChainFacade(agoricChainInfo);
-          chainByName.init(name, it);
+          chainByName.init('agoric', it);
           return it;
         },
       },
@@ -131,7 +130,6 @@ const prepareOrchestratorKit = (
             return watch(
               chainHub.getChainInfo('agoric'),
               this.facets.makeLocalChainFacadeWatcher,
-              name,
             );
           }
           return watch(
@@ -153,7 +151,6 @@ const prepareOrchestratorKit = (
           chainByName.has(baseName) ||
             Fail`use getChain(${q(baseName)}) before getBrandInfo(${q(denom)})`;
           const base = chainByName.get(baseName);
-          // @ts-expect-error XXX HostOf<> not quite right?
           return harden({ chain, base, brand, baseDenom });
         },
         /** @type {HostOf<Orchestrator['asAmount']>} */
diff --git a/packages/orchestration/src/exos/portfolio-holder-kit.js b/packages/orchestration/src/exos/portfolio-holder-kit.js
index 3177cdece3b..176b61ce916 100644
--- a/packages/orchestration/src/exos/portfolio-holder-kit.js
+++ b/packages/orchestration/src/exos/portfolio-holder-kit.js
@@ -8,7 +8,7 @@ import { VowShape } from '@agoric/vow';
 const { fromEntries } = Object;
 
 /**
- * @import {HostOf} from '@agoric/async-flow';
+ * @import {HostInterface, HostOf} from '@agoric/async-flow';
  * @import {MapStore} from '@agoric/store';
  * @import {VowTools} from '@agoric/vow';
  * @import {ResolvedPublicTopic} from '@agoric/zoe/src/contractSupport/topics.js';
@@ -18,7 +18,7 @@ const { fromEntries } = Object;
 
 /**
  * @typedef {{
- *   accounts: MapStore<string, OrchestrationAccount<any>>;
+ *   accounts: MapStore<string, HostInterface<OrchestrationAccount<any>>>;
  *   publicTopics: MapStore<string, ResolvedPublicTopic<unknown>>;
  * }} PortfolioHolderState
  */
@@ -99,6 +99,7 @@ const preparePortfolioHolderKit = (zone, { asVow, when }) => {
           const { accounts } = this.state;
           accounts.has(chainName) || Fail`no account found for ${chainName}`;
           const account = accounts.get(chainName);
+          // @ts-expect-error XXX invitationMakers
           return when(E(account).asContinuingOffer(), ({ invitationMakers }) =>
             E(invitationMakers)[action](...invitationArgs),
           );
@@ -125,7 +126,7 @@ const preparePortfolioHolderKit = (zone, { asVow, when }) => {
         },
         /**
          * @param {string} chainName key where the account is stored
-         * @param {OrchestrationAccount<any>} account
+         * @param {HostInterface<OrchestrationAccount<any>>} account
          * @param {ResolvedPublicTopic<unknown>} publicTopic
          */
         addAccount(chainName, account, publicTopic) {
diff --git a/packages/orchestration/test/exos/portfolio-holder-kit.test.ts b/packages/orchestration/test/exos/portfolio-holder-kit.test.ts
index 216764b64e1..5c215731212 100644
--- a/packages/orchestration/test/exos/portfolio-holder-kit.test.ts
+++ b/packages/orchestration/test/exos/portfolio-holder-kit.test.ts
@@ -70,7 +70,6 @@ test('portfolio holder kit behaviors', async t => {
   const cosmosAccount = await E(holder).getAccount('cosmoshub');
   t.is(
     cosmosAccount,
-    // @ts-expect-error type mismatch between kit and OrchestrationAccountI
     accounts.cosmoshub,
     'same account holder kit provided is returned',
   );
@@ -109,12 +108,15 @@ test('portfolio holder kit behaviors', async t => {
 
   const osmosisTopic = (await E(osmosisAccount).getPublicTopics()).account;
 
-  // @ts-expect-error type mismatch between kit and OrchestrationAccountI
-  await E(holder).addAccount('osmosis', osmosisAccount, osmosisTopic);
+  await E(holder).addAccount(
+    'osmosis',
+    osmosisAccount,
+    // @ts-expect-error the promise from `subscriber.getUpdateSince` can't be used in a flow
+    osmosisTopic,
+  );
 
   t.is(
     await E(holder).getAccount('osmosis'),
-    // @ts-expect-error type mismatch between kit and OrchestrationAccountI
     osmosisAccount,
     'new accounts can be added',
   );
diff --git a/packages/orchestration/test/staking-ops.test.ts b/packages/orchestration/test/staking-ops.test.ts
index 0a975f4e290..040f7ff5e74 100644
--- a/packages/orchestration/test/staking-ops.test.ts
+++ b/packages/orchestration/test/staking-ops.test.ts
@@ -239,6 +239,7 @@ test('makeAccount() writes to storage', async t => {
   });
   const { publicSubscribers } = await E.when(holder.asContinuingOffer());
   const accountNotifier = makeNotifierFromSubscriber(
+    // @ts-expect-error the promise from `subscriber.getUpdateSince` can't be used in a flow
     publicSubscribers.account.subscriber,
   );
   const storageUpdate = await E(accountNotifier).getUpdateSince();
diff --git a/packages/orchestration/test/types.test-d.ts b/packages/orchestration/test/types.test-d.ts
index 92f9c8de758..0c7512fd337 100644
--- a/packages/orchestration/test/types.test-d.ts
+++ b/packages/orchestration/test/types.test-d.ts
@@ -1,18 +1,22 @@
 /**
  * @file pure types types, no runtime, ignored by Ava
  */
+
 import { expectNotType, expectType } from 'tsd';
 import { typedJson } from '@agoric/cosmic-proto';
 import type { MsgDelegateResponse } from '@agoric/cosmic-proto/cosmos/staking/v1beta1/tx.js';
 import type { QueryAllBalancesResponse } from '@agoric/cosmic-proto/cosmos/bank/v1beta1/query.js';
 import type { Vow, VowTools } from '@agoric/vow';
 import type { GuestAsyncFunc, HostInterface, HostOf } from '@agoric/async-flow';
+import type { ResolvedPublicTopic } from '@agoric/zoe/src/contractSupport/topics.js';
 import type {
   ChainAddress,
   CosmosValidatorAddress,
   StakingAccountActions,
   OrchestrationAccount,
   Orchestrator,
+  Chain,
+  ChainInfo,
 } from '../src/types.js';
 import type { LocalOrchestrationAccountKit } from '../src/exos/local-orchestration-account.js';
 import { prepareCosmosOrchestrationAccount } from '../src/exos/cosmos-orchestration-account.js';
@@ -94,6 +98,30 @@ expectNotType<CosmosValidatorAddress>(chainAddr);
 
   // Negative test
   expectNotType<() => Promise<number>>(vowFn);
+
+  const getBrandInfo: HostOf<Orchestrator['getBrandInfo']> = null as any;
+  const chainHostOf = getBrandInfo('uatom').chain;
+  expectType<Vow<any>>(chainHostOf.getChainInfo());
+}
+
+{
+  // HostInterface
+
+  const chain: Chain<ChainInfo> = null as any;
+  expectType<Promise<ChainInfo>>(chain.getChainInfo());
+  const chainHostInterface: HostInterface<Chain<ChainInfo>> = null as any;
+  expectType<Vow<ChainInfo>>(chainHostInterface.getChainInfo());
+
+  const publicTopicRecord: HostInterface<
+    Record<string, ResolvedPublicTopic<unknown>>
+  > = {
+    someTopic: {
+      subscriber: null as any,
+      storagePath: 'published.somewhere',
+    },
+  };
+  // @ts-expect-error the promise from `subscriber.getUpdateSince` can't be used in a flow
+  expectType<Record<string, ResolvedPublicTopic<unknown>>>(publicTopicRecord);
 }
 
 // HostOf with TransferSteps
diff --git a/packages/vats/package.json b/packages/vats/package.json
index d77dc771cfd..7535d1a1196 100644
--- a/packages/vats/package.json
+++ b/packages/vats/package.json
@@ -76,6 +76,6 @@
     "workerThreads": false
   },
   "typeCoverage": {
-    "atLeast": 91.41
+    "atLeast": 91.52
   }
 }
diff --git a/packages/zoe/src/contractSupport/topics.js b/packages/zoe/src/contractSupport/topics.js
index b2a93d83bb9..5c25b28976f 100644
--- a/packages/zoe/src/contractSupport/topics.js
+++ b/packages/zoe/src/contractSupport/topics.js
@@ -2,6 +2,10 @@ import { SubscriberShape } from '@agoric/notifier';
 import { M } from '@agoric/store';
 import { E } from '@endo/far';
 
+/**
+ * @import {Remote} from '@agoric/internal';
+ */
+
 export { SubscriberShape };
 
 export const PublicTopicShape = M.splitRecord(
@@ -22,14 +26,14 @@ export const PublicTopicShape = M.splitRecord(
  */
 
 /**
- * A {PublicTopic} in which the `storagePath` is always a resolved string.
+ * A {PublicTopic} in which the `storagePath` is always a resolved string and the `subscriber is remote.
  *
  * Useful when working with Vows and async-flow.
  *
  * @template {object} T topic value
  * @typedef {{
  *   description?: string,
- *   subscriber: Subscriber<T>,
+ *   subscriber: Remote<Subscriber<T>>,
  *   storagePath: string,
  * }} ResolvedPublicTopic
  */