diff --git a/client/scripts/lib/format.mjs b/client/scripts/lib/format.mjs
index 1814d11cd..1007e858e 100644
--- a/client/scripts/lib/format.mjs
+++ b/client/scripts/lib/format.mjs
@@ -31,11 +31,16 @@ export async function isFormatted(path) {
   if (!options) throw new RatchetError(`no Prettier config applies to ${path}`);
   try {
     return await prettier.check(readText(path), { ...options, filepath: path });
-  } catch {
+  } catch (err) {
+    stopped.set(path, String(err instanceof Error ? err.message : err).split('
+')[0]);
     return false;
   }
 }
 
+/** Why Prettier gave up on a file, by its path, so the failure line can say it was not about style. */
+const stopped = new Map();
+
 /** The files under root that Prettier would rewrite, keyed by their path from root. */
 export async function unformatted(root) {
   const found = [];
@@ -74,6 +79,8 @@ export async function check({
   if (list) for (const key of found) log(`${allowed.has(key) ? 'listed' : 'new   '}  ${key}`);
   for (const key of fresh) {
     error(`FAIL  ${key} is not formatted. Run: npx prettier --write ${key}`);
+    const why = stopped.get(join(root, key));
+    if (why) error(`      Prettier could not format it: ${why}`);
   }
   for (const key of stale) {
     error(`FAIL  ${key} is listed in scripts/format-baseline.json but is formatted now or gone.`);
diff --git a/client/src/components/Assistant/cards/atlas/AtlasCards.test.tsx b/client/src/components/Assistant/cards/atlas/AtlasCards.test.tsx
index 0e91370e4..9539ff2d4 100644
--- a/client/src/components/Assistant/cards/atlas/AtlasCards.test.tsx
+++ b/client/src/components/Assistant/cards/atlas/AtlasCards.test.tsx
@@ -33,10 +33,7 @@ const passport: AtlasPassportCard = {
   kind: 'atlasPassport',
   countries: { visited: 23, planned: 4, idea: 0 },
   totals: { trips: 48, days: 410, places: 990, cities: 312, flownKm: 182_300 },
-  flags: [
-    ...CODES.map((code) => ({ code, status: 'visited' as const })),
-    { code: 'MA', status: 'planned' as const },
-  ],
+  flags: [...CODES.map((code) => ({ code, status: 'visited' as const })), { code: 'MA', status: 'planned' as const }],
   moreFlags: 4,
   continents: [
     { name: 'Europe', visited: 14, planned: 2 },
diff --git a/client/src/components/Assistant/cards/atlas/atlasCardModel.ts b/client/src/components/Assistant/cards/atlas/atlasCardModel.ts
index 2ee733113..fa27134c3 100644
--- a/client/src/components/Assistant/cards/atlas/atlasCardModel.ts
+++ b/client/src/components/Assistant/cards/atlas/atlasCardModel.ts
@@ -19,14 +19,13 @@ import type { ChangeItem } from '../../assistantParts';
  */
 
 /** How a country's or a region's standing reads. A table, so each word is named where it is read. */
-export const STATUS_LOOK: Readonly<Record<AtlasStatusAfter, { Icon: LucideIcon; tone: PillTone; labelKey: string }>> =
-  {
-    visited: { Icon: Check, tone: 'success', labelKey: 'assistant.card.atlas.status.visited' },
-    planned: { Icon: CalendarClock, tone: 'info', labelKey: 'assistant.card.atlas.status.planned' },
-    idea: { Icon: Lightbulb, tone: 'neutral', labelKey: 'assistant.card.atlas.status.idea' },
-    none: { Icon: CircleDashed, tone: 'neutral', labelKey: 'assistant.card.atlas.status.none' },
-    unknown: { Icon: Briefcase, tone: 'info', labelKey: 'assistant.card.atlas.status.unknown' },
-  };
+export const STATUS_LOOK: Readonly<Record<AtlasStatusAfter, { Icon: LucideIcon; tone: PillTone; labelKey: string }>> = {
+  visited: { Icon: Check, tone: 'success', labelKey: 'assistant.card.atlas.status.visited' },
+  planned: { Icon: CalendarClock, tone: 'info', labelKey: 'assistant.card.atlas.status.planned' },
+  idea: { Icon: Lightbulb, tone: 'neutral', labelKey: 'assistant.card.atlas.status.idea' },
+  none: { Icon: CircleDashed, tone: 'neutral', labelKey: 'assistant.card.atlas.status.none' },
+  unknown: { Icon: Briefcase, tone: 'info', labelKey: 'assistant.card.atlas.status.unknown' },
+};
 
 /** The continents in the Atlas page's own words. */
 export const CONTINENT_LABEL: Readonly<Record<AtlasCardContinent, { labelKey: string }>> = {
diff --git a/client/src/components/Assistant/cards/budget/ExpensesCard.tsx b/client/src/components/Assistant/cards/budget/ExpensesCard.tsx
index 88e5299eb..84e1b4b5e 100644
--- a/client/src/components/Assistant/cards/budget/ExpensesCard.tsx
+++ b/client/src/components/Assistant/cards/budget/ExpensesCard.tsx
@@ -126,7 +126,9 @@ export default function ExpensesCard({ cards }: { cards: readonly CardEntry[] })
         actions={<CardOpenButton target={costsTarget()} labelKey="assistant.card.budget.open" />}
       />
       <CardRows>
-        {card.rows.map((row, i) => <ExpenseRow key={row.id ?? `new-${i}`} row={row} />)}
+        {card.rows.map((row, i) => (
+          <ExpenseRow key={row.id ?? `new-${i}`} row={row} />
+        ))}
       </CardRows>
       <ExpensesFoot card={card} />
     </CardFrame>
diff --git a/client/src/components/Assistant/cards/budget/PaymentsCard.tsx b/client/src/components/Assistant/cards/budget/PaymentsCard.tsx
index a448d0537..4c6366e0b 100644
--- a/client/src/components/Assistant/cards/budget/PaymentsCard.tsx
+++ b/client/src/components/Assistant/cards/budget/PaymentsCard.tsx
@@ -65,7 +65,9 @@ export default function PaymentsCard({ cards }: { cards: readonly CardEntry[] })
         actions={<CardOpenButton target={costsTarget()} labelKey="assistant.card.budget.open" />}
       />
       <CardRows>
-        {card.rows.map((row, i) => <PaymentRow key={row.id ?? `new-${i}`} row={row} />)}
+        {card.rows.map((row, i) => (
+          <PaymentRow key={row.id ?? `new-${i}`} row={row} />
+        ))}
       </CardRows>
       <CardMore count={card.more} target={costsTarget()} />
     </CardFrame>
diff --git a/client/src/components/Assistant/cards/cardTypes.ts b/client/src/components/Assistant/cards/cardTypes.ts
index 11e51ff12..03e8900e9 100644
--- a/client/src/components/Assistant/cards/cardTypes.ts
+++ b/client/src/components/Assistant/cards/cardTypes.ts
@@ -118,6 +118,3 @@ export interface CardView<K extends TrekCardKind> {
   runnable?(card: TrekCardOf<K>): boolean;
   startsExcluded?(card: TrekCardOf<K>): boolean;
 }
-
-/** The view of a kind not drawn yet: it renders nothing, so its cards are left out until a package fills it. */
-export const PENDING_VIEW = {} satisfies CardView<TrekCardKind>;
diff --git a/client/src/components/Assistant/cards/collab/CollabChatThread.tsx b/client/src/components/Assistant/cards/collab/CollabChatThread.tsx
index cbd15dc87..0aa0a4af6 100644
--- a/client/src/components/Assistant/cards/collab/CollabChatThread.tsx
+++ b/client/src/components/Assistant/cards/collab/CollabChatThread.tsx
@@ -181,7 +181,9 @@ function Words({ bubble, spot, own }: Pick<BubbleProps, 'bubble' | 'spot' | 'own
       reply={bubble.reply}
       text={<MessageText text={bubble.text} plain />}
     >
-      {bubble.files.map((file) => <ChatFile key={file.fileId} file={file} tripId={tripId} />)}
+      {bubble.files.map((file) => (
+        <ChatFile key={file.fileId} file={file} tripId={tripId} />
+      ))}
     </ChatBubble>
   );
 }
diff --git a/client/src/components/Assistant/cards/collab/CollabNotesCard.tsx b/client/src/components/Assistant/cards/collab/CollabNotesCard.tsx
index 560e08f23..82a4f9df5 100644
--- a/client/src/components/Assistant/cards/collab/CollabNotesCard.tsx
+++ b/client/src/components/Assistant/cards/collab/CollabNotesCard.tsx
@@ -146,7 +146,9 @@ export default function CollabNotesBlock({ cards }: { cards: readonly CardEntry[
         actions={<CardOpenButton target={NOTES_TARGET} labelKey="assistant.card.collab.openNotes" />}
       />
       <div className={`mt-2 gap-2 ${density === 'roomy' ? 'grid grid-cols-2' : 'flex flex-col'}`}>
-        {notes.map((note, index) => <NoteView key={note.noteId ?? `new-${index}`} note={note} state={null} />)}
+        {notes.map((note, index) => (
+          <NoteView key={note.noteId ?? `new-${index}`} note={note} state={null} />
+        ))}
       </div>
       <CardMore count={more} labelKey="assistant.card.collab.moreNotes" target={NOTES_TARGET} />
     </CardFrame>
@@ -157,7 +159,9 @@ export default function CollabNotesBlock({ cards }: { cards: readonly CardEntry[
 export function CollabNotesBody({ card, item }: { card: NotesCard; item: ChangeItem }) {
   return (
     <div className="flex flex-col gap-2">
-      {card.notes.map((note, index) => <NoteView key={note.noteId ?? `new-${index}`} note={note} state={item.state} />)}
+      {card.notes.map((note, index) => (
+        <NoteView key={note.noteId ?? `new-${index}`} note={note} state={item.state} />
+      ))}
     </div>
   );
 }
diff --git a/client/src/components/Assistant/cards/collab/CollabPollsCard.tsx b/client/src/components/Assistant/cards/collab/CollabPollsCard.tsx
index 8210839dc..e16a9b472 100644
--- a/client/src/components/Assistant/cards/collab/CollabPollsCard.tsx
+++ b/client/src/components/Assistant/cards/collab/CollabPollsCard.tsx
@@ -133,7 +133,9 @@ export default function CollabPollsBlock({ cards }: { cards: readonly CardEntry[
         actions={<CardOpenButton target={POLLS_TARGET} labelKey="assistant.card.collab.openPolls" />}
       />
       <div className="mt-2 flex flex-col gap-2">
-        {polls.map((poll, index) => <PollView key={poll.pollId ?? `new-${index}`} poll={poll} state={null} />)}
+        {polls.map((poll, index) => (
+          <PollView key={poll.pollId ?? `new-${index}`} poll={poll} state={null} />
+        ))}
       </div>
       <CardMore count={more} labelKey="assistant.card.collab.morePolls" target={POLLS_TARGET} />
     </CardFrame>
@@ -144,7 +146,9 @@ export default function CollabPollsBlock({ cards }: { cards: readonly CardEntry[
 export function CollabPollsBody({ card, item }: { card: PollsCard; item: ChangeItem }) {
   return (
     <div className="flex flex-col gap-2">
-      {card.polls.map((poll, index) => <PollView key={poll.pollId ?? `new-${index}`} poll={poll} state={item.state} />)}
+      {card.polls.map((poll, index) => (
+        <PollView key={poll.pollId ?? `new-${index}`} poll={poll} state={item.state} />
+      ))}
     </div>
   );
 }
diff --git a/client/src/components/Assistant/cards/collection/collectionCardModel.ts b/client/src/components/Assistant/cards/collection/collectionCardModel.ts
index 919a6eb49..1f02961da 100644
--- a/client/src/components/Assistant/cards/collection/collectionCardModel.ts
+++ b/client/src/components/Assistant/cards/collection/collectionCardModel.ts
@@ -40,7 +40,7 @@ function placesCardOf(card: TrekCard | null): CollectionPlacesCard | null {
 }
 
 /** The saved place a change card is about: its only one. */
-export function firstPlace(card: TrekCard | null): CollectionCardPlace | null {
+function firstPlace(card: TrekCard | null): CollectionCardPlace | null {
   const places = placesCardOf(card)?.places ?? [];
   return places.length === 1 ? (places[0] ?? null) : null;
 }
diff --git a/client/src/components/Assistant/cards/journey/JourneyChangeSlots.tsx b/client/src/components/Assistant/cards/journey/JourneyChangeSlots.tsx
index 933cfa26c..20a2ba317 100644
--- a/client/src/components/Assistant/cards/journey/JourneyChangeSlots.tsx
+++ b/client/src/components/Assistant/cards/journey/JourneyChangeSlots.tsx
@@ -91,7 +91,9 @@ export function JourneyEntryFacts({ item }: { card: JourneyEntriesCard; item: Ch
           tone="info"
         />
       ))}
-      {states.map((row) => <StateChange key={row.field ?? row.labelKey} row={row} />)}
+      {states.map((row) => (
+        <StateChange key={row.field ?? row.labelKey} row={row} />
+      ))}
     </>
   );
 }
diff --git a/client/src/components/Assistant/cards/packing/checklistModel.test.ts b/client/src/components/Assistant/cards/packing/checklistModel.test.ts
index 1d9292c06..34cb8b25f 100644
--- a/client/src/components/Assistant/cards/packing/checklistModel.test.ts
+++ b/client/src/components/Assistant/cards/packing/checklistModel.test.ts
@@ -37,10 +37,7 @@ const row = (id: number | null, name: string, over: Partial<PackingCardItem> = {
   ...over,
 });
 
-const packing = (
-  groups: Array<[string, PackingCardItem[]]>,
-  over: Partial<PackingListCard> = {}
-): PackingListCard => ({
+const packing = (groups: Array<[string, PackingCardItem[]]>, over: Partial<PackingListCard> = {}): PackingListCard => ({
   kind: 'packingList',
   source: { type: 'trip' },
   groupBy: 'category',
diff --git a/client/src/components/Assistant/cards/packing/checklistParts.tsx b/client/src/components/Assistant/cards/packing/checklistParts.tsx
index 8c00f27bb..9a2c11654 100644
--- a/client/src/components/Assistant/cards/packing/checklistParts.tsx
+++ b/client/src/components/Assistant/cards/packing/checklistParts.tsx
@@ -139,15 +139,7 @@ export interface RunEntry {
 }
 
 /** A change in a run: the round include choice, the tile of what it does, and the row. */
-function RunRow({
-  entry,
-  excluded,
-  onToggle,
-}: {
-  entry: RunEntry;
-  excluded: boolean;
-  onToggle: (id: string) => void;
-}) {
+function RunRow({ entry, excluded, onToggle }: { entry: RunEntry; excluded: boolean; onToggle: (id: string) => void }) {
   const { t } = useTranslation();
   const { variant } = useAssistantView();
   const glyph = ROW_GLYPH[entry.change];
diff --git a/client/src/components/Assistant/cards/packing/packingParts.tsx b/client/src/components/Assistant/cards/packing/packingParts.tsx
index d6e11d40b..bde5e98c0 100644
--- a/client/src/components/Assistant/cards/packing/packingParts.tsx
+++ b/client/src/components/Assistant/cards/packing/packingParts.tsx
@@ -305,9 +305,7 @@ export function PackingGroup({
           ))}
         </ul>
       )}
-      {group.items.length > 0 && (
-        <MoreLine label={hidden > 0 ? t('tours.packing.more', { count: hidden }) : null} />
-      )}
+      {group.items.length > 0 && <MoreLine label={hidden > 0 ? t('tours.packing.more', { count: hidden }) : null} />}
     </section>
   );
 }
diff --git a/client/src/components/Assistant/cards/roadtrip/RoadtripBlock.tsx b/client/src/components/Assistant/cards/roadtrip/RoadtripBlock.tsx
index 7485519d8..ab2111b0d 100644
--- a/client/src/components/Assistant/cards/roadtrip/RoadtripBlock.tsx
+++ b/client/src/components/Assistant/cards/roadtrip/RoadtripBlock.tsx
@@ -20,15 +20,7 @@ import { settingLabel } from './roadtripSettings';
  */
 
 /** One way of driving it, as a row to pick: saved or tried, how far and how long, how much to look at. */
-function VariantRow({
-  card,
-  picked,
-  onPick,
-}: {
-  card: RoadtripCard;
-  picked: boolean;
-  onPick: () => void;
-}) {
+function VariantRow({ card, picked, onPick }: { card: RoadtripCard; picked: boolean; onPick: () => void }) {
   const { t } = useTranslation();
   const format = useCardFormat();
   const warnings = card.days.filter(dayHasWarning).length;
@@ -55,9 +47,7 @@ function VariantRow({
           })}
         </span>
         {warnings > 0 && (
-          <span className="flex-none text-warning">
-            {t('assistant.card.roadtrip.warnings', { count: warnings })}
-          </span>
+          <span className="flex-none text-warning">{t('assistant.card.roadtrip.warnings', { count: warnings })}</span>
         )}
       </button>
     </li>
diff --git a/client/src/components/Assistant/cards/tour/TourRouteActions.tsx b/client/src/components/Assistant/cards/tour/TourRouteActions.tsx
index a042de7c3..e2e7de533 100644
--- a/client/src/components/Assistant/cards/tour/TourRouteActions.tsx
+++ b/client/src/components/Assistant/cards/tour/TourRouteActions.tsx
@@ -76,7 +76,9 @@ export default function TourRouteActions({
         )}
       </div>
       {take.visible && caption && (
-        <p className="m-0 text-end text-caption text-content-muted" role="status">{caption}</p>
+        <p className="m-0 text-end text-caption text-content-muted" role="status">
+          {caption}
+        </p>
       )}
     </div>
   );
diff --git a/client/src/components/Assistant/cards/vacay/VacayChangeGroup.tsx b/client/src/components/Assistant/cards/vacay/VacayChangeGroup.tsx
index 8601f4c48..4246b01ae 100644
--- a/client/src/components/Assistant/cards/vacay/VacayChangeGroup.tsx
+++ b/client/src/components/Assistant/cards/vacay/VacayChangeGroup.tsx
@@ -70,7 +70,11 @@ export default function VacayChangeGroup({
         />
       )}
       {placed.length > 0 && (
-        <ul className="sr-only">{placed.map((entry) => <li key={entry.toolCallId}>{labelOf(entry)}</li>)}</ul>
+        <ul className="sr-only">
+          {placed.map((entry) => (
+            <li key={entry.toolCallId}>{labelOf(entry)}</li>
+          ))}
+        </ul>
       )}
       {twice && (
         <div className={PILLS}>
diff --git a/client/src/components/Assistant/cards/vacay/VacayMiniMonth.tsx b/client/src/components/Assistant/cards/vacay/VacayMiniMonth.tsx
index e5053b7a9..3764205b7 100644
--- a/client/src/components/Assistant/cards/vacay/VacayMiniMonth.tsx
+++ b/client/src/components/Assistant/cards/vacay/VacayMiniMonth.tsx
@@ -96,7 +96,13 @@ function Cell({
       {marks}
     </span>
   );
-  return cell.holiday ? <Tooltip label={cell.holiday.name} placement="top">{body}</Tooltip> : body;
+  return cell.holiday ? (
+    <Tooltip label={cell.holiday.name} placement="top">
+      {body}
+    </Tooltip>
+  ) : (
+    body
+  );
 }
 
 export default function VacayMiniMonth({ view, month, placed, today, size, onToggle, labelOf }: MonthProps) {
@@ -109,7 +115,9 @@ export default function VacayMiniMonth({ view, month, placed, today, size, onTog
       <p className={TITLE}>{title}</p>
       <div className={GRID[size]}>
         {weekdays.map((name, column) => (
-          <span key={`weekday-${column}`} aria-hidden="true" className={WEEKDAY}>{name}</span>
+          <span key={`weekday-${column}`} aria-hidden="true" className={WEEKDAY}>
+            {name}
+          </span>
         ))}
         {cells.map((cell, index) =>
           cell ? (
diff --git a/client/src/components/Assistant/cards/vacay/VacayRowFacts.tsx b/client/src/components/Assistant/cards/vacay/VacayRowFacts.tsx
index 685372a87..e3ef257b7 100644
--- a/client/src/components/Assistant/cards/vacay/VacayRowFacts.tsx
+++ b/client/src/components/Assistant/cards/vacay/VacayRowFacts.tsx
@@ -70,7 +70,9 @@ export default function VacayRowFacts({ card }: { card: VacayCard; item: ChangeI
         </SoftPill>
       )}
       {proposal.notes.map((note) => (
-        <SoftPill key={note} tone={NOTE_LOOK[note].tone}>{t(NOTE_LOOK[note].labelKey)}</SoftPill>
+        <SoftPill key={note} tone={NOTE_LOOK[note].tone}>
+          {t(NOTE_LOOK[note].labelKey)}
+        </SoftPill>
       ))}
     </>
   );
diff --git a/client/src/components/Collab/CollabNoteHead.tsx b/client/src/components/Collab/CollabNoteHead.tsx
index b8d0bc064..63c686383 100644
--- a/client/src/components/Collab/CollabNoteHead.tsx
+++ b/client/src/components/Collab/CollabNoteHead.tsx
@@ -33,7 +33,7 @@ export function NoteHeadBand({
 }) {
   return (
     <div
-      className={`flex items-center gap-2 py-1.5 ps-3 pe-1.5 ${bordered ? 'border-b border-edge-faint' : ''}`}
+      className={`flex items-center gap-2 py-1.5 pe-1.5 ps-3 ${bordered ? 'border-b border-edge-faint' : ''}`}
       style={{ background: tintOf(color) }}
     >
       {/* The category is only its colour here; the name is in the tooltip and the filter above. */}
diff --git a/server/src/nest/assistant/cards/collection/collection-applied.ts b/server/src/nest/assistant/cards/collection/collection-applied.ts
index c157d070a..3867902b1 100644
--- a/server/src/nest/assistant/cards/collection/collection-applied.ts
+++ b/server/src/nest/assistant/cards/collection/collection-applied.ts
@@ -122,7 +122,7 @@ function labelApplied({ result, preview }: AppliedInput): CollectionPlacesCard |
   return { ...card, labels: [{ ...shown, id: positiveId(label.id), name, color }] };
 }
 
-export const COLLECTION_APPLIED: Readonly<Record<string, (input: AppliedInput) => TrekCard | null>> = {
+export const COLLECTION_APPLIED: Readonly<Partial<Record<string, (input: AppliedInput) => TrekCard | null>>> = {
   save_place_to_collection: savedApplied,
   update_collection_place: placeApplied,
   set_collection_place_status: placeApplied,
@@ -137,22 +137,23 @@ export const COLLECTION_APPLIED: Readonly<Record<string, (input: AppliedInput) =
 };
 
 /** The ids a receipt names where the answer does not name them under the usual keys. */
-export const COLLECTION_APPLIED_IDS: Readonly<Record<string, (args: ToolArgs, result: unknown) => number[]>> = {
-  create_collection: (_args, result) => idsOf(positiveId(recordOf(recordOf(result).collection).id)),
-  update_collection: (args) => idsOf(argId(args, 'collectionId')),
-  delete_collection: (args) => idsOf(argId(args, 'collectionId')),
-  save_trip_places_to_collection: (args) => idsOf(argId(args, 'collectionId')),
-  accept_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
-  decline_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
-  cancel_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
-  create_collection_label: (args) => idsOf(argId(args, 'collection_id')),
-  update_collection_label: (_args, result) => idsOf(positiveId(recordOf(recordOf(result).label).collection_id)),
-  // The new trip places, so "Show on map" opens the first of them.
-  copy_collection_places_to_trip: (_args, result) =>
-    rowsOf(recordOf(result).created)
-      .map((row) => positiveId(row.id))
-      .filter((id): id is number => id !== null),
-};
+export const COLLECTION_APPLIED_IDS: Readonly<Partial<Record<string, (args: ToolArgs, result: unknown) => number[]>>> =
+  {
+    create_collection: (_args, result) => idsOf(positiveId(recordOf(recordOf(result).collection).id)),
+    update_collection: (args) => idsOf(argId(args, 'collectionId')),
+    delete_collection: (args) => idsOf(argId(args, 'collectionId')),
+    save_trip_places_to_collection: (args) => idsOf(argId(args, 'collectionId')),
+    accept_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
+    decline_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
+    cancel_collection_invite: (args) => idsOf(argId(args, 'collectionId')),
+    create_collection_label: (args) => idsOf(argId(args, 'collection_id')),
+    update_collection_label: (_args, result) => idsOf(positiveId(recordOf(recordOf(result).label).collection_id)),
+    // The new trip places, so "Show on map" opens the first of them.
+    copy_collection_places_to_trip: (_args, result) =>
+      rowsOf(recordOf(result).created)
+        .map((row) => positiveId(row.id))
+        .filter((id): id is number => id !== null),
+  };
 
 function idsOf(id: number | null): number[] {
   return id === null ? [] : [id];
diff --git a/server/src/nest/assistant/cards/collection/collection-load.ts b/server/src/nest/assistant/cards/collection/collection-load.ts
index 0cfa1a6db..3b11cdfe5 100644
--- a/server/src/nest/assistant/cards/collection/collection-load.ts
+++ b/server/src/nest/assistant/cards/collection/collection-load.ts
@@ -80,7 +80,7 @@ const oneLabel: Loader = async (args, read) => {
   return { ...NO_LOOKUP, items, collection: await collectionOf(read, positiveId(recordOf(label).collection_id)) };
 };
 
-export const COLLECTION_LOADS: Readonly<Record<string, Loader>> = {
+export const COLLECTION_LOADS: Readonly<Partial<Record<string, Loader>>> = {
   save_place_to_collection: async (args, read) => {
     const query = membershipQuery(args);
     const [collection, membership] = await Promise.all([