diff --git a/packages/governance/src/committee.js b/packages/governance/src/committee.js
index 80f9fb19449c..e4b0cb986f7c 100644
--- a/packages/governance/src/committee.js
+++ b/packages/governance/src/committee.js
@@ -5,6 +5,7 @@ import { makeStore, makeHeapFarInstance, M } from '@agoric/store';
 import { natSafeMath } from '@agoric/zoe/src/contractSupport/index.js';
 import { E } from '@endo/eventual-send';
 
+import { EmptyProposal } from '@agoric/zoe/src/typeGuards.js';
 import { makeHandle } from '@agoric/zoe/src/makeHandle.js';
 import {
   getOpenQuestions,
@@ -98,7 +99,12 @@ const start = (zcf, privateArgs) => {
                 return E(voteCap).submitVote(voterHandle, positions, 1n);
               };
 
-              return zcf.makeInvitation(continuingVoteHandler, 'vote');
+              return zcf.makeInvitation(
+                continuingVoteHandler,
+                'vote',
+                undefined,
+                EmptyProposal,
+              );
             },
           },
         ),
@@ -109,7 +115,12 @@ const start = (zcf, privateArgs) => {
     // This will produce unique descriptions because
     // makeCommitteeVoterInvitation() is only called within the following loop,
     // which is only called once per Electorate.
-    return zcf.makeInvitation(offerHandler, `Voter${index}`);
+    return zcf.makeInvitation(
+      offerHandler,
+      `Voter${index}`,
+      undefined,
+      EmptyProposal,
+    );
   };
 
   const { committeeName, committeeSize } = zcf.getTerms();
diff --git a/packages/governance/src/electorateTools.js b/packages/governance/src/electorateTools.js
index be9db4e1d2f4..0f9a06b9c1fd 100644
--- a/packages/governance/src/electorateTools.js
+++ b/packages/governance/src/electorateTools.js
@@ -1,5 +1,6 @@
 // @ts-check
 
+import { EmptyProposal } from '@agoric/zoe/src/typeGuards';
 import { E } from '@endo/eventual-send';
 import { deeplyFulfilled, Far } from '@endo/marshal';
 
@@ -88,7 +89,12 @@ const getQuestion = (questionHandleP, questionStore) =>
  */
 const getPoserInvitation = (zcf, addQuestion) => {
   const questionPoserHandler = () => Far(`questionPoser`, { addQuestion });
-  return zcf.makeInvitation(questionPoserHandler, `questionPoser`);
+  return zcf.makeInvitation(
+    questionPoserHandler,
+    `questionPoser`,
+    undefined,
+    EmptyProposal,
+  );
 };
 
 harden(startCounter);
diff --git a/packages/governance/src/noActionElectorate.js b/packages/governance/src/noActionElectorate.js
index aea932adc1eb..7f706e88cd1e 100644
--- a/packages/governance/src/noActionElectorate.js
+++ b/packages/governance/src/noActionElectorate.js
@@ -3,6 +3,7 @@
 import { makePublishKit } from '@agoric/notifier';
 import { makePromiseKit } from '@endo/promise-kit';
 import { makeHeapFarInstance } from '@agoric/store';
+import { EmptyProposal } from '@agoric/zoe/src/typeGuards.js';
 
 import { ElectoratePublicI, ElectorateCreatorI } from './typeGuards.js';
 
@@ -39,8 +40,12 @@ const start = zcf => {
 
   const creatorFacet = makeHeapFarInstance('creatorFacet', ElectorateCreatorI, {
     getPoserInvitation() {
-      return zcf.makeInvitation(() => {},
-      `noActionElectorate doesn't allow posing questions`);
+      return zcf.makeInvitation(
+        () => {},
+        `noActionElectorate doesn't allow posing questions`,
+        undefined,
+        EmptyProposal,
+      );
     },
     addQuestion(_instance, _question) {
       throw Error(`noActionElectorate doesn't add questions.`);
diff --git a/packages/inter-protocol/src/psm/psm.js b/packages/inter-protocol/src/psm/psm.js
index 95730750c2be..b1978189a99a 100644
--- a/packages/inter-protocol/src/psm/psm.js
+++ b/packages/inter-protocol/src/psm/psm.js
@@ -277,9 +277,11 @@ export const start = async (zcf, privateArgs, baggage) => {
         wantmintedHook,
         'wantMinted',
         undefined,
-        M.split({
+        harden({
           give: { In: anchorAmountShape },
           want: M.or({ Out: stableAmountShape }, {}),
+          multiples: 1n,
+          exit: M.any(),
         }),
       );
     },
@@ -288,9 +290,11 @@ export const start = async (zcf, privateArgs, baggage) => {
         giveMintedHook,
         'giveMinted',
         undefined,
-        M.split({
+        harden({
           give: { In: stableAmountShape },
           want: M.or({ Out: anchorAmountShape }, {}),
+          multiples: 1n,
+          exit: M.any(),
         }),
       );
     },
diff --git a/packages/inter-protocol/src/psm/psmCharter.js b/packages/inter-protocol/src/psm/psmCharter.js
index 5bbff37e0a6e..714a1faef47c 100644
--- a/packages/inter-protocol/src/psm/psmCharter.js
+++ b/packages/inter-protocol/src/psm/psmCharter.js
@@ -4,7 +4,10 @@ import '@agoric/governance/src/exported.js';
 import { makeScalarMapStore, M, makeHeapFarInstance, fit } from '@agoric/store';
 import '@agoric/zoe/exported.js';
 import '@agoric/zoe/src/contracts/exported.js';
-import { InstanceHandleShape } from '@agoric/zoe/src/typeGuards.js';
+import {
+  EmptyProposal,
+  InstanceHandleShape,
+} from '@agoric/zoe/src/typeGuards.js';
 import { BrandShape } from '@agoric/ertp';
 import { TimestampShape } from '@agoric/swingset-vat/src/vats/timer/typeGuards.js';
 import { E } from '@endo/far';
@@ -68,7 +71,12 @@ export const start = async zcf => {
       });
     };
 
-    return zcf.makeInvitation(voteOnParamChanges, 'vote on param changes');
+    return zcf.makeInvitation(
+      voteOnParamChanges,
+      'vote on param changes',
+      undefined,
+      EmptyProposal,
+    );
   };
 
   const makeOfferFilterInvitation = (instance, strings, deadline) => {
@@ -79,7 +87,12 @@ export const start = async zcf => {
       return E(psmGovernor).voteOnOfferFilter(counter, deadline, strings);
     };
 
-    return zcf.makeInvitation(voteOnOfferFilterHandler, 'vote on offer filter');
+    return zcf.makeInvitation(
+      voteOnOfferFilterHandler,
+      'vote on offer filter',
+      undefined,
+      EmptyProposal,
+    );
   };
 
   const MakerShape = M.interface('PSM Charter InvitationMakers', {
@@ -129,6 +142,8 @@ export const start = async zcf => {
         zcf.makeInvitation(
           charterMemberHandler,
           'PSM charter member invitation',
+          undefined,
+          EmptyProposal,
         ),
     },
   );
diff --git a/packages/inter-protocol/test/psm/test-psm.js b/packages/inter-protocol/test/psm/test-psm.js
index b8c3e40731b7..015a10447e77 100644
--- a/packages/inter-protocol/test/psm/test-psm.js
+++ b/packages/inter-protocol/test/psm/test-psm.js
@@ -624,7 +624,7 @@ test('wrong give giveMintedInvitation', async t => {
       ),
     {
       message:
-        '"giveMinted" proposal: required-parts: give: In: brand: "[Alleged: aUSD brand]" - Must be: "[Alleged: IST brand]"',
+        '"giveMinted" proposal: give: In: brand: "[Alleged: aUSD brand]" - Must be: "[Alleged: IST brand]"',
     },
   );
 });
@@ -654,7 +654,7 @@ test('wrong give wantMintedInvitation', async t => {
       ),
     {
       message:
-        '"wantMinted" proposal: required-parts: give: In: brand: "[Alleged: IST brand]" - Must be: "[Alleged: aUSD brand]"',
+        '"wantMinted" proposal: give: In: brand: "[Alleged: IST brand]" - Must be: "[Alleged: aUSD brand]"',
     },
   );
 });
@@ -676,7 +676,7 @@ test('extra give wantMintedInvitation', async t => {
       ),
     {
       message:
-        '"wantMinted" proposal: required-parts: give: {"Extra":{"brand":"[Alleged: aUSD brand]","value":"[200000000n]"},"In":{"brand":"[Seen]","value":"[200000000n]"}} - Must not have unexpected properties: ["Extra"]',
+        '"wantMinted" proposal: give: {"Extra":{"brand":"[Alleged: aUSD brand]","value":"[200000000n]"},"In":{"brand":"[Seen]","value":"[200000000n]"}} - Must not have unexpected properties: ["Extra"]',
     },
   );
 });
diff --git a/packages/zoe/src/contractSupport/zoeHelpers.js b/packages/zoe/src/contractSupport/zoeHelpers.js
index 2ff5303827fd..98cbe24ce7e3 100644
--- a/packages/zoe/src/contractSupport/zoeHelpers.js
+++ b/packages/zoe/src/contractSupport/zoeHelpers.js
@@ -1,7 +1,7 @@
 // @ts-check
 import '../../exported.js';
 
-import { fit, keyEQ } from '@agoric/store';
+import { fit, keyEQ, M } from '@agoric/store';
 import { E } from '@endo/eventual-send';
 import { makePromiseKit } from '@endo/promise-kit';
 import { AssetKind } from '@agoric/ertp';
@@ -219,6 +219,13 @@ export const depositToSeat = async (zcf, recipientSeat, amounts, payments) => {
   const invitation = zcf.makeInvitation(
     reallocateAfterDeposit,
     'temporary seat for deposit',
+    undefined,
+    harden({
+      give: M.any(),
+      want: {},
+      multiples: 1n,
+      exit: { onDemand: null },
+    }),
   );
   const proposal = harden({ give: amounts });
   harden(payments);
diff --git a/packages/zoe/src/typeGuards.js b/packages/zoe/src/typeGuards.js
index 2eb5fec8b21a..4e5629f9368b 100644
--- a/packages/zoe/src/typeGuards.js
+++ b/packages/zoe/src/typeGuards.js
@@ -45,6 +45,12 @@ export const FullProposalShape = harden({
 });
 /** @see {Proposal} type */
 export const ProposalShape = M.partial(FullProposalShape);
+export const EmptyProposal = harden({
+  give: {},
+  want: {},
+  multiples: 1n,
+  exit: { onDemand: null },
+});
 
 export const isOnDemandExitRule = exit => {
   const [exitKey] = Object.getOwnPropertyNames(exit);