diff --git a/.changeset/query-zod-module-description.md b/.changeset/query-zod-module-description.md
new file mode 100644
index 0000000000..7a82fd700a
--- /dev/null
+++ b/.changeset/query-zod-module-description.md
@@ -0,0 +1,29 @@
+---
+"@objectstack/spec": patch
+---
+
+fix(spec): `data/query.zod.ts` now describes the query AST, not one sort node
+
+The published skill reference indexes and the generated `data/query` reference
+page opened on "Sort Node" — the description of a single `{ field, order }`
+pair — for the file that carries the entire `QueryAST`.
+
+The generators publish the module's OWN doc block: top-level, in the header
+zone, documenting no symbol. `query.zod.ts` had no block of its own, and
+`SortNodeSchema`'s qualified, because the file's rationale comments sit between
+that block and its schema, so nothing attached it to a symbol. The mechanism was
+understood when the file was written — a warning comment sits directly under
+that block saying the first block becomes the page description. What was not
+noticed is the ORDERING: the first block belonged to a symbol, and a comment
+warning about a rule is not the same as satisfying it.
+
+The file now opens with a short header of its own, reusing the sentence
+`QueryAST`'s own type block already carried. Four published skill indexes
+(`objectstack-query`, `objectstack-data`, `objectstack-api`, `objectstack-ui`)
+and the reference page name the query AST as a result. `SortNode`'s block is
+untouched and still documents the schema it belongs to; the warning comment
+beside it now names which block is published and which selector picks it.
+
+What the wrong row cost, in the skills' own terms: the skill tells an agent to
+read the source for exact field shapes, so a pointer labelled "Sort Node" makes
+it skip the one file that carries the AST.
diff --git a/content/docs/references/data/query.mdx b/content/docs/references/data/query.mdx
index aa1d0329f4..85a7bd909d 100644
--- a/content/docs/references/data/query.mdx
+++ b/content/docs/references/data/query.mdx
@@ -5,9 +5,11 @@ description: Query protocol schemas
 
 {/* ⚠️  AUTO-GENERATED — DO NOT EDIT. Run build-docs.ts to regenerate. Hand-written docs live in the module folders under content/docs/. */}
 
-Sort Node
-Represents "Order By" — one `{ field, order }` pair. Unknown keys are
-REJECTED (#4721); spell the direction `order`, never `direction`.
+QueryAST — Abstract Syntax Tree for data queries.
+
+The query AST every data read is expressed in: `where` predicates, `fields`
+projection, `orderBy` sort nodes, `expand` traversal, pagination and
+aggregation.
 
 <Callout type="info">
 **Source:** `packages/spec/src/data/query.zod.ts`
diff --git a/packages/spec/scripts/query-pointer-row.test.ts b/packages/spec/scripts/query-pointer-row.test.ts
new file mode 100644
index 0000000000..6186905edb
--- /dev/null
+++ b/packages/spec/scripts/query-pointer-row.test.ts
@@ -0,0 +1,110 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Pin for WHAT the published pointer row for `data/query.zod.ts` names — the
+ * query AST, not one sort node.
+ *
+ * `build-skill-references.ts` describes each source by the module's own doc
+ * block (`lib/file-description.ts` selects it: top-level, in the header zone,
+ * documenting no symbol). `query.zod.ts` had no block of its own, and
+ * `SortNodeSchema`'s block qualified — the file's rationale comments sit
+ * between that block and its schema, so nothing attached it to a symbol. Four
+ * published indexes (`objectstack-query`, `-data`, `-api`, `-ui`) therefore
+ * labelled the file carrying the whole `QueryAST` "Sort Node", and the public
+ * reference page `content/docs/references/data/query.mdx` opened on it. The
+ * skill tells an agent to Read the source for exact field shapes, so that row
+ * cost the one read it exists to route: an agent looking for the query AST
+ * skips the only file that has it.
+ *
+ * No gate could see it. `check:skill-refs` and `check:docs` compare the
+ * artifact against the generator, and the generator reproduced the wrong block
+ * faithfully — the same blind spot #5059 and #12201 found one layer up, so the
+ * answer is the same one: pin the fact the artifact must state, not the
+ * pipeline that states it.
+ *
+ * Two legs, and they fail DIFFERENTLY, which is why both exist. The SOURCE leg
+ * reds the moment the file header is deleted or demoted below another block —
+ * no regeneration needed. The CORPUS leg stays green through that (it reads
+ * checked-in bytes, which only move when someone regenerates) and reds on the
+ * state this card actually found: an index regenerated from a file with no
+ * header of its own. MEASURED both ways in the fix's reverse verification.
+ */
+
+import fs from 'fs';
+import path from 'path';
+import url from 'url';
+
+import { describe, expect, it } from 'vitest';
+
+import { findModuleDocBlock } from './lib/file-description';
+
+const HERE = path.dirname(url.fileURLToPath(import.meta.url));
+const REPO_ROOT = path.resolve(HERE, '../../..');
+const SKILLS_DIR = path.resolve(REPO_ROOT, 'skills');
+const QUERY_SOURCE = path.resolve(HERE, '../src/data/query.zod.ts');
+
+/**
+ * The module's own opening sentence — the one `QueryAST`'s type block already
+ * carried further down the file. Spelled out rather than derived from the
+ * source: deriving it would re-assert the generator's rule and say nothing
+ * about WHICH subject the row names, which is the whole defect.
+ */
+const QUERY_AST_SENTENCE = 'QueryAST — Abstract Syntax Tree for data queries.';
+
+/** The pointer path the generator writes for this source in every index. */
+const POINTER = 'node_modules/@objectstack/spec/src/data/query.zod.ts';
+
+/** First prose line of the block the generator would publish for a source. */
+const firstDescriptionLine = (source: string): string | null => {
+  const block = findModuleDocBlock(source);
+  if (block === null) return null;
+  const lines = block
+    .split('\n')
+    .map((line) => line.replace(/^\s*\*\s?/, '').trim())
+    .filter((line) => line && !line.startsWith('@') && !line.startsWith('```'));
+  return lines[0] ?? null;
+};
+
+describe('data/query.zod.ts — the module block describes the module', () => {
+  it('opens on the QueryAST sentence, not on `SortNode`', () => {
+    const source = fs.readFileSync(QUERY_SOURCE, 'utf-8');
+    expect(firstDescriptionLine(source)).toBe(QUERY_AST_SENTENCE);
+  });
+
+  it('still carries `SortNode`s own block — the fix adds a header, it does not move a symbol doc', () => {
+    // Passing by deleting the symbol's documentation would satisfy the row and
+    // lose what the block says about `direction` vs `order` (#4721).
+    expect(fs.readFileSync(QUERY_SOURCE, 'utf-8')).toContain(' * Sort Node');
+  });
+});
+
+describe('published catalog — every pointer row for the query AST names it', () => {
+  /** Every checked-in skill-index row pointing at `data/query.zod.ts`. */
+  const publishedRows = (): { file: string; description: string }[] => {
+    const rows: { file: string; description: string }[] = [];
+    for (const skill of fs.readdirSync(SKILLS_DIR)) {
+      const index = path.resolve(SKILLS_DIR, skill, 'references/_index.md');
+      if (!fs.existsSync(index)) continue;
+      for (const line of fs.readFileSync(index, 'utf-8').split('\n')) {
+        const match = /^- `([^`]+)` — (.+)$/.exec(line);
+        if (match && match[1] === POINTER) {
+          rows.push({ file: path.relative(REPO_ROOT, index), description: match[2].trim() });
+        }
+      }
+    }
+    return rows;
+  };
+
+  it('finds the rows at all', () => {
+    // Nothing parsed means nothing compared, and "no bad row" would read as
+    // green — the failure mode this whole file exists to refuse.
+    expect(publishedRows().length).toBeGreaterThan(0);
+  });
+
+  it('reads the QueryAST sentence on every one of them', () => {
+    const offenders = publishedRows()
+      .filter((row) => row.description !== QUERY_AST_SENTENCE)
+      .map((row) => `${row.file}: ${row.description}`);
+    expect(offenders).toEqual([]);
+  });
+});
diff --git a/packages/spec/src/data/query.zod.ts b/packages/spec/src/data/query.zod.ts
index 7e40486284..341bb947a4 100644
--- a/packages/spec/src/data/query.zod.ts
+++ b/packages/spec/src/data/query.zod.ts
@@ -7,13 +7,23 @@ import { lazySchema } from '../shared/lazy-schema';
 import { retiredKey } from '../shared/retired-key';
 import { strictObject } from '../shared/strict-object';
 
+/**
+ * QueryAST — Abstract Syntax Tree for data queries.
+ *
+ * The query AST every data read is expressed in: `where` predicates, `fields`
+ * projection, `orderBy` sort nodes, `expand` traversal, pagination and
+ * aggregation.
+ */
+
 /**
  * Sort Node
  * Represents "Order By" — one `{ field, order }` pair. Unknown keys are
  * REJECTED (#4721); spell the direction `order`, never `direction`.
  */
-// ⚠️ Keep the block above short: `build-docs.ts` takes the FIRST JSDoc block in
-// the file as this page's description, so the rationale below is line comments.
+// ⚠️ Keep the file header above short: `build-docs.ts` publishes the FIRST
+// HEADER-ZONE doc block that documents no symbol — the zone ends at the first
+// declaration, so a later block cannot take over (`scripts/lib/file-description.ts`
+// selects it) — as this page's description, so the rationale below is line comments.
 //
 // ─── Why this one schema is strict while the rest of the file is not (#4721) ──
 //
diff --git a/skills/objectstack-api/references/_index.md b/skills/objectstack-api/references/_index.md
index 9aa8e71cf7..519c9ff728 100644
--- a/skills/objectstack-api/references/_index.md
+++ b/skills/objectstack-api/references/_index.md
@@ -27,7 +27,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/data/field-value.zod.ts` — Field runtime VALUE-shape contract (ADR-0104 D1).
 - `node_modules/@objectstack/spec/src/data/field.zod.ts` — Exports: FieldType, SelectOptionSchema, LocationCoordinatesSchema, CurrencyConfigSchema, CurrencyValueSchema
 - `node_modules/@objectstack/spec/src/data/filter.zod.ts` — Unified Query DSL Specification
-- `node_modules/@objectstack/spec/src/data/query.zod.ts` — Sort Node
+- `node_modules/@objectstack/spec/src/data/query.zod.ts` — QueryAST — Abstract Syntax Tree for data queries.
 - `node_modules/@objectstack/spec/src/kernel/execution-context.zod.ts` — Exports: ExecutionContextSchema
 - `node_modules/@objectstack/spec/src/kernel/metadata-protection.zod.ts` — Metadata Protection Model — Phase 1 (ADR-0010)
 - `node_modules/@objectstack/spec/src/security/explain.zod.ts` — [ADR-0090 D6] Access-explanation contract — `explain(principal, object,
diff --git a/skills/objectstack-data/references/_index.md b/skills/objectstack-data/references/_index.md
index 1526a53b26..187e605343 100644
--- a/skills/objectstack-data/references/_index.md
+++ b/skills/objectstack-data/references/_index.md
@@ -34,7 +34,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/data/field-value.zod.ts` — Field runtime VALUE-shape contract (ADR-0104 D1).
 - `node_modules/@objectstack/spec/src/data/filter.zod.ts` — Unified Query DSL Specification
 - `node_modules/@objectstack/spec/src/data/hook-body.zod.ts` — Exports: HookBodyCapability, ExpressionBodySchema, ScriptBodySchema, HookBodySchema
-- `node_modules/@objectstack/spec/src/data/query.zod.ts` — Sort Node
+- `node_modules/@objectstack/spec/src/data/query.zod.ts` — QueryAST — Abstract Syntax Tree for data queries.
 - `node_modules/@objectstack/spec/src/kernel/metadata-protection.zod.ts` — Metadata Protection Model — Phase 1 (ADR-0010)
 - `node_modules/@objectstack/spec/src/security/rls.zod.ts` — Row-Level Security (RLS) Protocol
 - `node_modules/@objectstack/spec/src/shared/enums.zod.ts` — Exports: SortDirectionEnum, SortItemSchema, MutationEventEnum, IsolationLevelEnum
diff --git a/skills/objectstack-query/references/_index.md b/skills/objectstack-query/references/_index.md
index 3cea130c09..0287454b4e 100644
--- a/skills/objectstack-query/references/_index.md
+++ b/skills/objectstack-query/references/_index.md
@@ -11,7 +11,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 
 - `node_modules/@objectstack/spec/src/data/date-macros.zod.ts` — Date Macro Tokens — the declarative placeholders the UI substitutes
 - `node_modules/@objectstack/spec/src/data/filter.zod.ts` — Unified Query DSL Specification
-- `node_modules/@objectstack/spec/src/data/query.zod.ts` — Sort Node
+- `node_modules/@objectstack/spec/src/data/query.zod.ts` — QueryAST — Abstract Syntax Tree for data queries.
 
 ## Transitive dependencies
 
diff --git a/skills/objectstack-ui/references/_index.md b/skills/objectstack-ui/references/_index.md
index 02f1bb86c5..96831e8bd9 100644
--- a/skills/objectstack-ui/references/_index.md
+++ b/skills/objectstack-ui/references/_index.md
@@ -29,7 +29,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/data/field.zod.ts` — Exports: FieldType, SelectOptionSchema, LocationCoordinatesSchema, CurrencyConfigSchema, CurrencyValueSchema
 - `node_modules/@objectstack/spec/src/data/filter.zod.ts` — Unified Query DSL Specification
 - `node_modules/@objectstack/spec/src/data/hook-body.zod.ts` — Exports: HookBodyCapability, ExpressionBodySchema, ScriptBodySchema, HookBodySchema
-- `node_modules/@objectstack/spec/src/data/query.zod.ts` — Sort Node
+- `node_modules/@objectstack/spec/src/data/query.zod.ts` — QueryAST — Abstract Syntax Tree for data queries.
 - `node_modules/@objectstack/spec/src/kernel/metadata-protection.zod.ts` — Metadata Protection Model — Phase 1 (ADR-0010)
 - `node_modules/@objectstack/spec/src/shared/enums.zod.ts` — Exports: SortDirectionEnum, SortItemSchema, MutationEventEnum, IsolationLevelEnum
 - `node_modules/@objectstack/spec/src/shared/expression.zod.ts` — Expression Protocol