@@ -2056,7 +2056,7 @@
       "title": "Action buttons surface at exactly their declared locations — list toolbar, list row, record header/more/related/section — and each dispatches for real",
       "since": "v15",
       "status": "active",
-      "revision": 17,
+      "revision": 18,
       "priority": "P1",
       "surface": "browser",
       "personas": [
@@ -2065,7 +2065,7 @@
       "fixtures": {
         "app": "showcase",
         "requires": [
-          "the per-location action fleet on showcase_task (examples/app-showcase/src/ui/actions/index.ts): showcase_bulk_reassign (list_item+list_toolbar, flow), showcase_quick_view (list_item, modal), showcase_mark_done (list_item+record_header+record_section, a declarative write on the default script route — operation 'update', patch {done: true, progress: 100} — visible 'has(record.done) && record.done != true'), showcase_log_time (record_header+record_related+record_section, form), showcase_open_docs (record_more, url), showcase_recalc_selection (record_more, api — declares record_more ONLY, which is what keeps it off the toolbar; objectui#3142), showcase_new_task (locations: [] — the fleet's headless specimen, read by the empty-locations probe), showcase_reopen_task (list_item only, operation 'update' patch {done: false}, visible 'has(record.done) && record.done == true' — Mark Done's mirror, so a done task's row menu offers Reopen where a not-done one offers Mark Done; a click on it is refused by the showcase_guard_task_reopen hook by design, which records-forms.script-action-hook-refusal-toast drives)",
+          "the per-location action fleet on showcase_task (examples/app-showcase/src/ui/actions/index.ts): showcase_bulk_reassign (list_item+list_toolbar, flow), showcase_quick_view (list_item, modal), showcase_mark_done (list_item+record_header, a declarative write on the default script route — operation 'update', patch {done: true, progress: 100} — visible 'has(record.done) && record.done != true'), showcase_log_time (record_header+record_related, form), showcase_open_docs (record_more, url), showcase_recalc_estimate (record_section only, api — the Task Detail quick-actions bar's action), showcase_recalc_selection (record_more, api — declares record_more ONLY, which is what keeps it off the toolbar; objectui#3142), showcase_new_task (locations: [] — the fleet's headless specimen, read by the empty-locations probe), showcase_reopen_task (list_item only, operation 'update' patch {done: false}, visible 'has(record.done) && record.done == true' — Mark Done's mirror, so a done task's row menu offers Reopen where a not-done one offers Mark Done; a click on it is refused by the showcase_guard_task_reopen hook by design, which records-forms.script-action-hook-refusal-toast drives)",
           "seeded tasks in both done and not-done states for the CEL visibility both-sides check"
         ],
         "provisioning": {
@@ -2074,7 +2074,7 @@
         },
         "knownGaps": [
           "NO PIN COVERS A FULL CLAUSE — `automated` was dropped at revision 13, so this P1 item is hand-driven (Tier 2). The two objectui live specs it cited are adjacent: e2e/live/list-row-action-cel.spec.ts opens the first task row's menu and asserts only that at most one Mark Done renders (not both sides of acceptance[3], nor its fail-closed half), and e2e/live/action-modal.spec.ts only that the host's row Edit opens and closes a modal (one dispatch kind of acceptance[2], on no declared action). Tier 1 run #24598 scored every clause not-run on them. Re-add `automated` only with a pin that asserts a full clause.",
-          "[CLOSED by #22030 (PR #22036, 60ccda5a24), lifted by #22039 — the gap text is rewritten to say where each location now lives] a stock showcase boot hosts all six locations on showcase_task, including the three this gap used to block. record_header and record_more: Task Detail (showcase_task_detail, the record page the console opens for any task), whose first node is a page:header. That header renders the action ids it lists, each placed by its own locations, followed by the host's Edit / Share / Delete. Inline (record_header) on a desktop viewport, where the header's default inline budget is 3 (1 on mobile; a record_header action past the budget folds into ⋯): showcase_mark_done (script, shown only while the task is not done), showcase_log_time (form) and showcase_archive_task (script, disabled until the task is done). Under the ⋯ overflow (record_more without record_header): showcase_open_docs (url), showcase_recalc_estimate (api) and showcase_recalc_selection (api). The Task Detail quick-actions bar (record_section) names its actions explicitly (actionNames: mark_done, log_time and archive_task, in examples/app-showcase/src/ui/pages/task-detail.page.ts), so showcase_recalc_estimate, which declares record_section too, is absent there by page authoring, not a missing placement (run #25817). record_related: Project Detail (showcase_project_detail, the record page for any project) → the Related tab (?tab=related), which holds the Tasks related list, a record:related_list for showcase_task through its project FK; open a project that has tasks. It is an authored node, not the synthesizer's strip: the page's tabs override still replaces that strip, and this tab puts the list back with no actions key, so its rows carry showcase_log_time beside the task's list_item actions, and its header renders the list_toolbar action (Reassign…), as in 18.1 (run #25817): that list's own toolbar placement, not an extra one. The Tasks tab beside it is the record:line_items grid, which hosts no record_related action. An expected action missing from one of these hosts is a missing placement, never blocked(fixture). The hosts were read from objectui source at pin a58626c88dc8 and from the served metadata, not from a browser render, so the first run against them is their first browser evidence",
+          "[CLOSED by #22030 (PR #22036, 60ccda5a24), lifted by #22039 — the gap text is rewritten to say where each location now lives] a stock showcase boot hosts all six locations on showcase_task, including the three this gap used to block. record_header and record_more: Task Detail (showcase_task_detail, the record page the console opens for any task), whose first node is a page:header. That header renders the action ids it lists, each placed by its own locations, followed by the host's Edit / Share / Delete. Inline (record_header) on a desktop viewport, where the header's default inline budget is 3 (1 on mobile; a record_header action past the budget folds into ⋯): showcase_mark_done (script, shown only while the task is not done), showcase_log_time (form) and showcase_archive_task (script, disabled until the task is done). Under the ⋯ overflow (record_more without record_header): showcase_open_docs (url) and showcase_recalc_selection (api). The Task Detail quick-actions bar (record_section) names the task's record_section set, showcase_recalc_estimate (api), in examples/app-showcase/src/ui/pages/task-detail.page.ts; no action the header draws is also in the bar, so each action renders once on the page (#27520 row 9). record_related: Project Detail (showcase_project_detail, the record page for any project) → the Related tab (?tab=related), which holds the Tasks related list, a record:related_list for showcase_task through its project FK; open a project that has tasks. It is an authored node, not the synthesizer's strip: the page's tabs override still replaces that strip, and this tab puts the list back with no actions key, so its rows carry showcase_log_time beside the task's list_item actions, and its header renders the list_toolbar action (Reassign…), as in 18.1 (run #25817): that list's own toolbar placement, not an extra one. The Tasks tab beside it is the record:line_items grid, which hosts no record_related action. An expected action missing from one of these hosts is a missing placement, never blocked(fixture). The hosts were read from objectui source at pin a58626c88dc8 and from the served metadata, not from a browser render, so the first run against them is their first browser evidence",
           "CLOSED by the qaact-placement-specimen recipe (#26625) for acceptance[4] half (a) and acceptance[3]'s fail-closed half. A runtime-authored action is still not joined into the served object's actions[] (QA run #23163 A4: its positive control, the same probe with a location, rendered nowhere), and authoring refuses a throwing `visible` (QA run #26456), so ⛔ do not author either probe at runtime. The recipe installs both specimens through the package loader, whose actions the served object does carry. Score half (a) on qaact_no_locations and the fail-closed half on qaact_visible_throws, each only on a surface where the recipe's qaact_control renders: the list row menu and the Project Detail Related-tab row menus. Task Detail's header, ⋯ overflow and quick-actions bar list their action ids, so the control is absent there and they are no evidence for either half (the recipe's knownGaps[0]). Half (b) stays on showcase_new_task as before."
         ]
       },
@@ -2084,7 +2084,7 @@
         "record_header — showcase_mark_done / showcase_log_time in the detail title bar",
         "record_more — showcase_open_docs / showcase_recalc_selection under the ⋯ overflow",
         "record_related — showcase_log_time on each row of the related-list section inside a record (the Tasks related list on a showcase_project record), and on no row of the showcase_task list view",
-        "record_section — showcase_mark_done / showcase_log_time in the Task Detail quick-actions bar (record:quick_actions resolves through the location filter)",
+        "record_section — showcase_recalc_estimate in the Task Detail quick-actions bar (record:quick_actions resolves through the location filter)",
         "empty-locations semantics probe — an action with NO locations key renders on NO surface, and `locations: []` likewise (objectui#3142 collapsed the renderers onto one membership predicate, `actionRendersAt`; placement is a declaration, which is why recalc_selection has to name record_more)"
       ],
       "steps": [
@@ -2247,6 +2247,12 @@
           "date": "2026-10-31",
           "change": "fixtures.requires[0], steps[5] and acceptance[3]'s clause name Mark Done's real predicate and list showcase_reopen_task. From QA run #27441 (W3-C3b, at c4c515ad; wave anchor #27377, wave-3 accuracy slice S1). showcase_mark_done's `visible` has been 'has(record.done) && record.done != true' since #8990 (has() guards the sparse list_item face, and != true never faults on a projected null), not '!record.done', and it is a declarative operation 'update' write on the default script route. showcase_reopen_task, the hook-refusal specimen, is its list_item-only mirror ('has(record.done) && record.done == true'), so a done task's row menu shows Reopen where the not-done one shows Mark Done; steps[5] says not to count it. Read at base a0f865491d: examples/app-showcase/src/ui/actions/index.ts. The both-sides contract is unchanged",
           "ref": "#27441"
+        },
+        {
+          "revision": 18,
+          "date": "2026-11-01",
+          "change": "The Task Detail page draws each task action once (#27520 row 9: the walkthrough saw Mark Done, Log Time and Archive both in the header and as a button row in the body). The quick-actions bar now carries the task's record_section set alone, showcase_recalc_estimate, which declares record_section only, and Mark Done, Log Time and Archive drop record_section. fixtures.requires[0], the record_section variant and knownGaps[1] re-pointed: record_section is still hosted on showcase_task, by Recalculate Estimate in the bar, and the ⋯ overflow keeps open_docs (url) and recalc_selection (api). Read from the examples source at this branch, not a browser run; no clause changed",
+          "ref": "#27520"
         }
       ],
       "enumSource": {
 
@@ -90,10 +90,9 @@ export const MarkDoneAction = defineAction({
   // still reads an unset `done` as "not done". `has()` alone is therefore the
   // whole guard here. Rule: `packages/objectql/src/declared-fields.ts`.
   visible: 'has(record.done) && record.done != true',
-  // `record_section` so the Task Detail page's `record:quick_actions` bar
-  // (which names this action) resolves it — the engine location-filters even
-  // explicitly-named actions, mirroring the platform's own sys-user pages.
-  locations: ['list_item', 'record_header', 'record_section'],
+  // No `record_section`: the Task Detail header already draws it, and its
+  // quick-actions bar carries only what the header does not (one action row).
+  locations: ['list_item', 'record_header'],
   refreshAfter: true,
 });
 
@@ -190,7 +189,11 @@ export const RecalcEstimateAction = defineAction({
   execution: 'perRecord',
   // Names the task (see MarkDoneAction's note on the hole and its fallback).
   successMessage: "Estimate recalculated for {{ record.title | default:'the task' }}.",
-  locations: ['record_more', 'record_section'],
+  // `record_section` only: the Task Detail page's `record:quick_actions` bar
+  // names it, and the engine location-filters even explicitly-named actions.
+  // Not `record_more` too, so the page draws it once, in that bar, and not
+  // again under the header's ⋯ overflow.
+  locations: ['record_section'],
   // The endpoint is record-scoped and rejects a body without an id. On a
   // record surface the page supplies it; invoked from a LIST ROW (see the
   // `legacy_row_actions` view) nothing else can, so name the body key the
@@ -268,8 +271,7 @@ export const LogTimeAction = defineAction({
   // implicitly claims the `default` key), so pointing a form action there opens
   // a list as a form — now a build error (#2554).
   target: 'showcase_task.form',
-  // `record_section` so it surfaces in the Task Detail quick-actions bar too.
-  locations: ['record_header', 'record_related', 'record_section'],
+  locations: ['record_header', 'record_related'],
   refreshAfter: true,
 });
 
@@ -501,7 +503,7 @@ export const ArchiveTaskAction = defineAction({
   // "Not available for this record", which names neither. Display only; it
   // never gates the dispatch.
   disabledReason: 'Mark the task done first.',
-  locations: ['record_header', 'record_section'],
+  locations: ['record_header'],
   refreshAfter: false,
 });
 
 
@@ -13,7 +13,9 @@ import { definePage } from '@objectstack/spec/ui';
  *   • `record:alert`       — a conditional banner shown only while the task is
  *                            In Review (demonstrates the ADR-0089 component-node
  *                            `visibleWhen` predicate, `has()`-guarded).
- *   • `record:quick_actions` — object Actions surfaced as inline buttons.
+ *   • `record:quick_actions` — object Actions surfaced as inline buttons: the
+ *                            task's `record_section` set, which the header
+ *                            does not draw, so each action shows once.
  *   • `record:highlights` + `record:details` — the standard compact + section
  *                            layout.
  * `kind: 'full'` — this page fully owns the record layout, as the Project
@@ -57,9 +59,8 @@ export const TaskDetailPage = definePage({
               'showcase_mark_done',
               'showcase_log_time',
               'showcase_archive_task',
-              // record_more only — the ⋯ overflow (url, api, api).
+              // record_more only — the ⋯ overflow (url, api).
               'showcase_open_docs',
-              'showcase_recalc_estimate',
               'showcase_recalc_selection',
             ],
           },
@@ -110,10 +111,10 @@ export const TaskDetailPage = definePage({
           properties: {
             location: 'record_section',
             align: 'start',
-            // showcase_archive_task is the `disabled`-predicate specimen:
-            // visible on every task, greyed until `record.done` (contrast with
-            // showcase_mark_done's `visible`, which HIDES once done).
-            actionNames: ['showcase_mark_done', 'showcase_log_time', 'showcase_archive_task'],
+            // The task's `record_section` set, and nothing the header above
+            // draws: one action row per action, never the same buttons twice.
+            // Mark Done, Log Time and Archive live in the header only.
+            actionNames: ['showcase_recalc_estimate'],
           },
         },
         {
 
@@ -1,7 +1,7 @@
 // Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
 
 import { describe, it, expect } from 'vitest';
-import { PageHeaderProps, RecordRelatedListProps } from '@objectstack/spec/ui';
+import { PageHeaderProps, RecordQuickActionsProps, RecordRelatedListProps } from '@objectstack/spec/ui';
 
 import stack from '../objectstack.config.js';
 import { Task } from '../src/data/objects/task.object.js';
@@ -157,4 +157,45 @@ describe('showcase_task record action locations have a stock host (#22030)', ()
       expect(result.success, JSON.stringify(result.error?.issues)).toBe(true);
     });
   });
+
+  describe('record_section — the Task Detail quick-actions bar (objectstack#27520 row 9)', () => {
+    const bars = taskPage ? allComponents(taskPage).filter((c) => c.type === 'record:quick_actions') : [];
+    const names = (bars[0]?.properties?.actionNames ?? []) as unknown[];
+    const headerIds = (taskPage
+      ? (allComponents(taskPage).find((c) => c.type === 'page:header')?.properties?.actions ?? [])
+      : []) as unknown[];
+
+    it('composes one quick-actions bar at record_section that parses against the spec row', () => {
+      expect(bars).toHaveLength(1);
+      expect(bars[0]?.properties?.location).toBe('record_section');
+      const result = RecordQuickActionsProps.safeParse(bars[0]?.properties);
+      expect(result.success, JSON.stringify(result.error?.issues)).toBe(true);
+    });
+
+    it('names the task\'s whole record_section set, each declaring record_section', () => {
+      expect(names.length).toBeGreaterThan(0);
+      const sectionSet = taskActions.filter(declares('record_section')).map((a) => a.name as string);
+      expect([...names].sort()).toEqual([...sectionSet].sort());
+    });
+
+    it('draws each action once: nothing the bar names is also drawn by the header', () => {
+      // Control: both lists are populated, so an empty overlap is a reading.
+      expect(names.length).toBeGreaterThan(0);
+      expect(headerIds.length).toBeGreaterThan(0);
+      expect(names.filter((n) => headerIds.includes(n))).toEqual([]);
+      // And by declaration: no task action is placed both in the header's
+      // locations and in the bar's, so a synthesized page cannot double it either.
+      const doubled = taskActions
+        .filter(declares('record_section'))
+        .filter((a) => declares('record_header')(a) || declares('record_more')(a))
+        .map((a) => a.name);
+      expect(doubled).toEqual([]);
+    });
+  });
+
+  it('every record location keeps a stock host for a task action', () => {
+    for (const location of ['record_header', 'record_more', 'record_related', 'record_section']) {
+      expect(taskActions.filter(declares(location)).length, location).toBeGreaterThan(0);
+    }
+  });
 });