@@ -0,0 +1,18 @@
+---
+'@object-ui/fields': minor
+'@object-ui/plugin-grid': patch
+'@object-ui/app-shell': patch
+---
+
+A bulk action's field-backed param now renders its real control on the selection bar, and the confirm step names the picked record (objectui#12105).
+
+A list view's `bulkActions: ['add_to_campaign']` runs the object's own action over the selected records. When that action declares a field-backed param, `{ field: 'crm_campaign', objectOverride: 'crm_campaign_member' }`, the selection bar's dialog drew a plain text box for it, and the confirm step listed the raw record id. The record page drew the record picker for the same action, because only its dialog looked the field up.
+
+- **One resolver for both dialogs.** The function that resolves an action param against the object's field definitions (`resolveActionParam` / `resolveActionParams`) moves, unchanged, from `@object-ui/app-shell` into `@object-ui/fields`, the one package both dialogs depend on. The record dialog and the bulk dialog both call it. A field-backed param on the selection bar now gets its field's type, label (translated), options, default and picker target, as it does on the record page. A lookup param renders the record picker, and the confirm step shows the record's label.
+- **When it resolves.** The grid resolves a promoted action's params when the dialog opens, after it has loaded the session's object metadata, so a param whose owning object (`objectOverride`) has not loaded yet is waited for.
+- **A missing field is refused, not drawn as a text box.** A field-backed param whose field is not in the object metadata is shown as a refusal naming `object.field`, and the run is blocked, as the record dialog already does. The copy is the existing `actionDialog.unresolvedParam` string.
+- **Inline params are unchanged.** A param declared with its own `name` and `type` keeps the same widget, label, help text, default and `reference` target.
+
+New `@object-ui/fields` exports: `resolveActionParam`, `resolveActionParams`, `resolveParamWidgetType`, `withKnownObjects`, `RESOLVED_ONLY_PARAM_KEYS`, and the types `RawActionParam`, `RawActionParamOption` and `ResolveActionParamsContext`. Before this change these were internal to `@object-ui/app-shell` and were not exported from it. No other export, prop, context member or language-pack key is added.
+
+Not covered yet: on the selection bar, a resolved lookup param uses only its field's picker target, display field and `dependsOn`. The field's other picker settings (`lookupFilters`, `lookupColumns`, `descriptionField` and the rest) do not reach the bulk dialog yet.
@@ -153,6 +153,11 @@ gets its real widget, not a text box (ADR-0059):
 - **Field-backed params** declare `field` (+ optional `objectOverride`) and
   inherit label, type, options, lookup picker config, `multiple`, `accept`,
   and `maxSize` from the object's field definition; inline properties override.
+  The same resolution runs when the action is named in a list's `bulkActions`
+  and launched from the selection bar, so a field-backed lookup param gets the
+  record picker there too. On the selection bar, the field's picker target,
+  display field and `dependsOn` reach the picker; its other picker settings
+  (`lookupFilters`, `lookupColumns`, …) do not yet.
 - `required` blocks submit while the value is empty; `visible` (a CEL
   predicate over `features` / `current_user` / `data`) hides a param
   entirely — e.g. gate a param on an opt-in server capability. There is no
 
@@ -579,6 +579,15 @@ carrying callbacks.
 }
 ```
 
+A name in `bulkActions` runs that action once per selected record. If the
+action declares `params`, the selection bar's dialog collects them once, before
+the run, and resolves them as the record page's action dialog does. A
+field-backed param (`{ "field": "crm_campaign", "objectOverride":
+"crm_campaign_member" }`) takes its type, label, options, default and picker
+target from that field, so a lookup param renders the record picker and the
+confirm step shows the picked record's label. A param whose field is not in
+the object metadata is refused, and the run is blocked.
+
 ### Row callbacks are component props
 
 `onRowClick`, `onRowSelect`, `onCellChange`, `onRowSave`, `onBatchSave`,
 
@@ -46,7 +46,7 @@ import { ActionParamDialog, type ParamDialogState } from '../views/ActionParamDi
 import { ActionResultDialog, type ResultDialogState } from '../views/ActionResultDialog.js';
 import { FlowRunner, type ScreenFlowState, type ScreenSpec } from '../views/FlowRunner.js';
 import { FlowRefusalNotice, type FlowRefusalState } from '../views/FlowRefusalNotice.js';
-import { resolveActionParams, withKnownObjects } from '../utils/resolveActionParams.js';
+import { resolveActionParams, withKnownObjects } from '@object-ui/fields';
 import { EnvironmentEntitlementDialog, type EntitlementDialogState } from '../environment/EnvironmentEntitlementDialog.js';
 import { entitlementDialogFromError, type EntitlementDialogSpec } from '../environment/entitlements.js';
 import { resolvePageVarTokens } from '../utils/resolvePageVarTokens.js';
 
@@ -51,7 +51,7 @@
  */
 import { describe, it, expect } from 'vitest';
 import { deriveRelatedLists } from '../deriveRelatedLists';
-import { resolveActionParams } from '../resolveActionParams';
+import { resolveActionParams } from '@object-ui/fields';
 
 /** Broken-on-purpose: the two keys disagree, so the answer names the reader's choice. */
 const DIVERGENT = { type: 'master_detail' as const, reference: 'canonical_target', reference_to: 'legacy_target' };
 
@@ -27,7 +27,7 @@ import {
   decisionOutputParams,
   foldDecisionOutputs,
 } from './decisionOutputParams';
-import { resolveActionParams } from './resolveActionParams';
+import { resolveActionParams } from '@object-ui/fields';
 import { paramToField } from './paramToField';
 
 const t = (key: string) => `t:${key}`;
 
@@ -60,7 +60,7 @@ import {
   resolveActionParams,
   type ResolveActionParamsContext,
   type RawActionParam,
-} from './resolveActionParams';
+} from '@object-ui/fields';
 
 /**
  * The spec's own `FieldType` vocabulary.
 
@@ -18,7 +18,8 @@
 import { describe, it, expect, vi, afterEach } from 'vitest';
 import { FORM_FIELD_TYPES } from '@object-ui/fields';
 import { EXPANDABLE_FIELD_TYPES, type ActionParamDef } from '@object-ui/core';
-import { paramToField, paramDegradesWithoutTarget, resolveParamWidgetType } from './paramToField';
+import { paramToField, paramDegradesWithoutTarget } from './paramToField';
+import { resolveParamWidgetType } from '@object-ui/fields';
 
 const p = (over: Partial<ActionParamDef>): ActionParamDef => ({
   name: 'x',
 
@@ -13,32 +13,11 @@
  * asserting param support ⊇ form support.
  */
 import { EXPANDABLE_FIELD_TYPES, type ActionParamDef } from '@object-ui/core';
-import { resolveFormWidgetType } from '@object-ui/fields';
-
-/**
- * Param-only type spellings the dialog historically accepted, folded onto the
- * canonical form widget vocabulary. These are legacy dialect entries kept for
- * params already authored with them — new params should use spec `FieldType`
- * values directly.
- */
-const PARAM_TYPE_ALIASES: Record<string, string> = {
-  checkbox: 'boolean',
-  reference: 'lookup',
-  'datetime-local': 'datetime',
-  // NOTE: spec's `autonumber` (vs the widget-map key `auto_number`) is folded
-  // in the shared `mapFieldTypeToFormType`, so `resolveFormWidgetType` already
-  // handles it — no param-only alias needed here.
-};
-
-/**
- * Resolve a param `type` to the form widget key that renders it. Any type in
- * `FORM_FIELD_TYPES` resolves to itself (identity — asserted by the drift
- * test); aliases and unknown types resolve through the same fallback chain the
- * form applies (unknown → `text`).
- */
-export function resolveParamWidgetType(paramType: string): string {
-  return resolveFormWidgetType(PARAM_TYPE_ALIASES[paramType] ?? paramType);
-}
+// The param-type fold (its alias table included) moved to `@object-ui/fields`
+// beside the resolver that reads it first (objectui#12105). This adapter asks
+// the same question one step later, so it reads the same function — never a
+// local copy of the table.
+import { resolveParamWidgetType } from '@object-ui/fields';
 
 /**
  * Widget keys whose picker cannot query without an explicitly DECLARED target,
 
@@ -56,7 +56,7 @@ import {
   resolveActionParams,
   type ResolveActionParamsContext,
   type RawActionParam,
-} from './resolveActionParams';
+} from '@object-ui/fields';
 import { paramToField } from './paramToField';
 
 /** The camel filter value — kept by reference so identity is assertable. */