diff --git a/.changeset/tame-donkeys-repeat.md b/.changeset/tame-donkeys-repeat.md
new file mode 100644
index 0000000000..dc5c9f6e3d
--- /dev/null
+++ b/.changeset/tame-donkeys-repeat.md
@@ -0,0 +1,33 @@
+---
+'@objectstack/cli': patch
+'@objectstack/lint': patch
+---
+
+i18n section headings: read only the declared `label` spelling, never `title`
+
+`record:details` sections and form-view sections declare exactly one heading key —
+`label` (`RecordDetailsProps.sections[]` and `FormSectionSchema`; #5611 settled this
+by declaring `label` and deliberately NOT declaring `title`). Two consumers still
+read `label ?? title`:
+
+- `os i18n extract` / `os lint`'s coverage walk (`i18n-extract.ts`) scaffolded
+  `objects.<object>._sections.<name>.label` from a `title`;
+- the `translation-section-name-missing` lint rule accepted a `title` as the
+  heading it reports on.
+
+Both now read `label` only. Per Prime Directive #12 the tolerance was the bug: a
+consumer that reads an undeclared spelling turns it into a second de-facto contract,
+and here it did so on the loudest possible surface — the extractor would seed a
+translation bundle key from a spelling the schema rejects, teaching the wrong key to
+every translator downstream.
+
+FROM → TO: a section authored as `{ name: 'timeline', title: 'Timeline' }` becomes
+`{ name: 'timeline', label: 'Timeline' }`. No migration is expected in practice —
+every `record:details` section in this repo and in `packages/platform-objects`
+already authors `label` (~12 sections, zero `title`).
+
+Behaviour change if you do author `title`: the heading is treated as absent. The
+extractor still emits the section's expected key (it is derived from `name`) but
+seeds it with the section name instead of your `title` text, and the lint rule no
+longer reports that section. Rename the key to `label` — which is also what the
+schema itself will tell you, since `title` is not a declared key there.
diff --git a/packages/cli/src/utils/i18n-extract.ts b/packages/cli/src/utils/i18n-extract.ts
index 36e7dff897..a231d636de 100644
--- a/packages/cli/src/utils/i18n-extract.ts
+++ b/packages/cli/src/utils/i18n-extract.ts
@@ -439,10 +439,14 @@ function addSectionList(index: SectionIndex, sections: unknown, objectName: unkn
   for (const section of sections) {
     if (!section || typeof section !== 'object') continue;
     const s = section as Record<string, unknown>;
-    // `record:details` reads `title ?? label`, form views author `label`; a
-    // localized-map label (`{ en, 'zh-CN' }`) is already multilingual and
+    // `label` is the ONE heading spelling both surfaces declare —
+    // `RecordDetailsProps.sections[]` and `FormSectionSchema` (#5611, #5730).
+    // A `title` here is off-spec and deliberately unread: reading it would
+    // scaffold a bundle key for a heading the schema rejects, which is how a
+    // consumer-side tolerance grows into a second de-facto contract (PD #12).
+    // A localized-map label (`{ en, 'zh-CN' }`) is already multilingual and
     // `inlineText` drops it to "nothing authored in plain text".
-    addSection(index, objectName, s.name, s.label ?? s.title);
+    addSection(index, objectName, s.name, s.label);
   }
 }
 
diff --git a/packages/cli/test/i18n-section-coverage.test.ts b/packages/cli/test/i18n-section-coverage.test.ts
index 734efb13cf..53e7f9105d 100644
--- a/packages/cli/test/i18n-section-coverage.test.ts
+++ b/packages/cli/test/i18n-section-coverage.test.ts
@@ -217,7 +217,7 @@ describe('authored record-page sections', () => {
                   properties: {
                     sections: [
                       { name: 'overview', label: 'Overview', fields: ['name'] },
-                      { name: 'timeline', title: 'Timeline', fields: ['close_date'] },
+                      { name: 'timeline', label: 'Timeline', fields: ['close_date'] },
                     ],
                   },
                 },
@@ -236,11 +236,30 @@ describe('authored record-page sections', () => {
     ]);
   });
 
-  it('reads `title` as the source text too — that is what `record:details` renders', () => {
+  it('reads `label` as the source text', () => {
     const timeline = sectionEntries({ pages: [slottedPage] }).find((e) => e.path[3] === 'timeline');
     expect(timeline?.inline).toBe('Timeline');
   });
 
+  it('does NOT read an off-spec `title` as the source text — the key is still emitted, empty', () => {
+    // #5730: `label` is the only heading spelling `RecordDetailsProps.sections[]`
+    // declares (#5611). The walk keys sections off `name`, so a `title`-only
+    // section STILL contributes its expected key — what it must not contribute
+    // is source text, because scaffolding `"Timeline"` into a bundle from an
+    // off-spec key is how the second spelling would become self-documenting.
+    // Asserting the key survives is what keeps this non-vacuous: the entry is
+    // present and its `inline` is empty, not absent because nothing was walked.
+    const titled = JSON.parse(JSON.stringify(slottedPage));
+    const sections = titled.slots.tabs.properties.items[0].children[0].properties.sections;
+    sections[1] = { name: 'timeline', title: 'Timeline', fields: ['close_date'] };
+
+    const entries = sectionEntries({ pages: [titled] });
+    expect(entries.map((e) => e.path.join('.'))).toContain(
+      'objects.crm_opportunity._sections.timeline.label',
+    );
+    expect(entries.find((e) => e.path[3] === 'timeline')?.inline).toBeUndefined();
+  });
+
   it('reaches the plain `regions[].components[]` shape, and never mines a page REGION name', () => {
     // `PageSchema.aliases` maps `sections` → `regions`, and a region carries a
     // `name` exactly like a section does. The shared walk enters at
diff --git a/packages/lint/src/validate-translatable-sections.test.ts b/packages/lint/src/validate-translatable-sections.test.ts
index 69d7050b08..7efed244f6 100644
--- a/packages/lint/src/validate-translatable-sections.test.ts
+++ b/packages/lint/src/validate-translatable-sections.test.ts
@@ -314,24 +314,37 @@ describe('validateTranslatableSections — what it deliberately leaves alone', (
     expect(findings).toEqual([]);
   });
 
-  it('reads a detail section\'s `title` as its heading', () => {
-    // `record:details` reads `title ?? label` — a nameless section with only a
-    // `title` renders a heading just the same.
-    const findings = validateTranslatableSections({
-      objects: [crmCase],
-      pages: [
-        {
-          name: 'case_detail',
-          object: 'crm_case',
-          regions: [{ components: [{ type: 'record:details', properties: { sections: [{ title: 'SLA' }] } }] }],
-        },
-      ],
-      translations: caseTranslated,
-    });
+  // #5730: `label` is the only heading spelling `RecordDetailsProps.sections[]`
+  // declares (#5611). The rule used to read `label ?? title`, which meant an
+  // off-spec `title` earned a translation-shaped warning — telling the author
+  // their `title` heading needed a `name` to be translatable, i.e. teaching the
+  // spelling the schema rejects. The two cases below are one pin, deliberately
+  // PAIRED: the `label` case proves the walk reaches this component at all, so
+  // the `title` case's empty result is the tolerance being gone and not the
+  // fixture failing to arrive (#5046's "green because nothing was produced").
+  const namelessDetailSection = (section: Record<string, unknown>) => ({
+    objects: [crmCase],
+    pages: [
+      {
+        name: 'case_detail',
+        object: 'crm_case',
+        regions: [{ components: [{ type: 'record:details', properties: { sections: [section] } }] }],
+      },
+    ],
+    translations: caseTranslated,
+  });
+
+  it('reads a detail section\'s `label` as its heading', () => {
+    const findings = validateTranslatableSections(namelessDetailSection({ label: 'SLA' }));
     expect(findings).toHaveLength(1);
     expect(findings[0].where).toContain('section "SLA"');
   });
 
+  it('does NOT read a detail section\'s off-spec `title` as its heading', () => {
+    const findings = validateTranslatableSections(namelessDetailSection({ title: 'SLA' }));
+    expect(findings).toEqual([]);
+  });
+
   it('keys a retargeted component under the object it actually binds', () => {
     // A `record:details` pointed at another object keys its headings THERE, so
     // the gate must consult that object's translations, not the page's.
diff --git a/packages/lint/src/validate-translatable-sections.ts b/packages/lint/src/validate-translatable-sections.ts
index c65931fcb0..30d8691db2 100644
--- a/packages/lint/src/validate-translatable-sections.ts
+++ b/packages/lint/src/validate-translatable-sections.ts
@@ -323,10 +323,12 @@ export function validateTranslatableSections(stack: AnyRec): TranslatableSection
       const section = site.sections[i];
       if (!isRec(section)) continue;
       if (strName(section.name)) continue;
-      // `record:details` reads `title ?? label`; form views author `label`. A
-      // section with neither has no heading rendered at all, so there is
-      // nothing untranslated to report — that is `required/label`'s question.
-      const heading = strName(section.label) ?? strName(section.title);
+      // `label` is the ONE heading spelling both surfaces declare —
+      // `RecordDetailsProps.sections[]` and `FormSectionSchema` (#5611, #5730).
+      // A section with no `label` has no heading the schema recognises, so
+      // there is nothing untranslated to report — that is `required/label`'s
+      // question, and an off-spec `title` is its business, not this rule's.
+      const heading = strName(section.label);
       if (!heading) continue;
 
       const slug = suggestedName(heading);