diff --git a/.changeset/7292-turbo-owns-build-order.md b/.changeset/7292-turbo-owns-build-order.md
new file mode 100644
index 0000000000..7f2d617f5c
--- /dev/null
+++ b/.changeset/7292-turbo-owns-build-order.md
@@ -0,0 +1,26 @@
+---
+---
+
+Build orchestration only; no published behaviour changes.
+
+`@object-ui/components` and `@object-ui/site` each carried a hand-written
+`prebuild` (and, for components, a `pretest` pointing at it) that listed the
+workspace packages their build needed. That list is a second, unchecked copy of
+the package's own `dependencies`, and the components one had drifted: it named
+three packages while the closure turbo derives is seven, so
+`pnpm --filter @object-ui/components build` failed inside `@object-ui/react` on
+any tree where `@object-ui/i18n` and `@object-ui/data-objectstack` were not
+already built. Both hooks are deleted; turbo's `build.dependsOn: ["^build"]` is
+now the single source of build order, as it already was for every path CI takes.
+
+Trade-off, recorded here rather than left implicit: the bare per-package forms
+`pnpm --filter @object-ui/components build` and `pnpm --filter @object-ui/components test`
+no longer build their upstream packages first. They were never a supported entry
+point on a clean tree — that is the defect this removes, not a capability it
+takes away — but on a warm tree they used to be self-sufficient and now are not.
+The supported forms are `turbo run build --filter=@object-ui/components` and
+`turbo run test --filter=@object-ui/components` (turbo's `test` task also
+declares `dependsOn: ["^build"]`), plus the repo-root `pnpm test`. Every
+in-repo document and hint string that taught the direct form now teaches the
+turbo form, and the root `site:build` script goes through turbo, matching what
+CI already ran.
diff --git a/apps/site/package.json b/apps/site/package.json
index 988588b83b..161ab80b7f 100644
--- a/apps/site/package.json
+++ b/apps/site/package.json
@@ -3,7 +3,6 @@
   "version": "3.1.0",
   "private": true,
   "scripts": {
-    "prebuild": "pnpm --filter @object-ui/example-schema-catalog build",
     "build": "next build",
     "lint": "eslint .",
     "dev": "next dev",
diff --git a/package.json b/package.json
index 3a5c5013a9..1f2fcd390d 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "test:integration": "vitest run --project dom --project dom-heavy",
   "test:dist": "turbo run test:dist --filter=@object-ui/components",
     "site:dev": "pnpm --filter @object-ui/site dev",
-    "site:build": "pnpm --filter @object-ui/site build",
+    "site:build": "turbo run build --filter=@object-ui/site",
     "site:start": "pnpm --filter @object-ui/site start",
     "test:watch": "vitest",
     "test:ui": "vitest --ui",
diff --git a/packages/components/README_SHADCN_SYNC.md b/packages/components/README_SHADCN_SYNC.md
index 20672a385c..960336da8a 100644
--- a/packages/components/README_SHADCN_SYNC.md
+++ b/packages/components/README_SHADCN_SYNC.md
@@ -134,10 +134,14 @@ If you don't have network access or prefer manual control:
 
 7. **Test the Component**
    ```bash
-   pnpm --filter @object-ui/components build
-   pnpm --filter @object-ui/components test
+   turbo run build --filter=@object-ui/components
+   turbo run test --filter=@object-ui/components
    ```
 
+   Go through turbo, not `pnpm --filter @object-ui/components build`: turbo
+   derives this package's build closure from its `dependencies`, and on a tree
+   where those are not built yet the bare per-package build fails.
+
 ## Using Official Shadcn CLI
 
 You can also use the official Shadcn CLI:
@@ -241,13 +245,14 @@ className="... dark:bg-background/95 dark:backdrop-blur-sm"
 
 ```bash
 # Type check
-pnpm --filter @object-ui/components type-check
+turbo run type-check --filter=@object-ui/components
 
-# Build
-pnpm --filter @object-ui/components build
+# Build (turbo builds the upstream packages this one needs; a bare
+# `pnpm --filter @object-ui/components build` does not)
+turbo run build --filter=@object-ui/components
 
 # Run tests
-pnpm --filter @object-ui/components test
+turbo run test --filter=@object-ui/components
 
 # Integration test
 pnpm test
diff --git a/packages/components/package.json b/packages/components/package.json
index 7455695be1..12055578ca 100644
--- a/packages/components/package.json
+++ b/packages/components/package.json
@@ -27,8 +27,6 @@
   },
   "scripts": {
     "build": "vite build && node scripts/build-css.mjs",
-    "prebuild": "pnpm --filter @object-ui/types build && pnpm --filter @object-ui/core build && pnpm --filter @object-ui/react build",
-    "pretest": "pnpm run prebuild",
     "test": "vitest run --root ../.. packages/components/",
     "test:dist": "OBJECTUI_DIST_PINS=1 vitest run --root ../.. --config vitest.config.mts --project dist",
     "type-check": "tsc --noEmit && tsc -p tsconfig.test.json",
diff --git a/packages/components/src/__tests__/page-header-action-ids.dist.spec.tsx b/packages/components/src/__tests__/page-header-action-ids.dist.spec.tsx
index c27b0a79aa..5e5566d02a 100644
--- a/packages/components/src/__tests__/page-header-action-ids.dist.spec.tsx
+++ b/packages/components/src/__tests__/page-header-action-ids.dist.spec.tsx
@@ -184,7 +184,8 @@ describe('page:header — BUILT artifact (objectui#7183, re-derived from PR obje
         'meant to be reached through `pnpm test:dist`, whose turbo task carries ' +
         '`dependsOn: ["build"]` for the package under test and therefore builds it first. ' +
         'Running the project directly builds nothing — build it yourself with ' +
-        '`pnpm --filter @object-ui/components build`.',
+        '`turbo run build --filter=@object-ui/components`, which orders the packages ' +
+        'this one is built from.',
     ).toBe(true);
   });
 
diff --git a/scripts/__tests__/helpers/build-program.ts b/scripts/__tests__/helpers/build-program.ts
index 8e73108d9d..b74e7f74d2 100644
--- a/scripts/__tests__/helpers/build-program.ts
+++ b/scripts/__tests__/helpers/build-program.ts
@@ -90,13 +90,17 @@ import { rel, repoRoot, type WorkspacePackage } from './turbo-inputs';
  *    plugins). Declared explicitly, and empty, so the shared walker's
  *    key-directed designation rule is visibly a decision here.
  *  - A `pnpm --filter <pkg> build` SEGMENT IS A TASK-GRAPH FACT, NOT AN INPUTS
- *    FACT. Two packages have a `prebuild` that builds another workspace package
- *    (pnpm runs `prebuild` as part of `pnpm run build`, so turbo runs it too).
- *    The right answer to "this package's build needs that package's dist" is
- *    turbo's `dependsOn: ["^build"]`, not a `$TURBO_ROOT$` glob over another
+ *    FACT. The right answer to "this package's build needs that package's dist"
+ *    is turbo's `dependsOn: ["^build"]`, not a `$TURBO_ROOT$` glob over another
  *    package's source. So delegations are collected and returned rather than
- *    walked, and `../turbo-build-inputs.test.ts` asserts each delegated package
- *    is a DECLARED dependency — which is what makes `^build` order it.
+ *    walked. NO PACKAGE DELEGATES TODAY (objectui#7292 deleted the last two:
+ *    `packages/components` hand-listed types/core/react in a `prebuild` while
+ *    its real closure was seven packages, and `apps/site` named the schema
+ *    catalog it already declares as a dependency), and
+ *    `../turbo-build-inputs.test.ts` now RATCHETS that to zero rather than
+ *    policing the survivors: a hand-written list of a package's own build
+ *    closure is a second, unchecked copy of its `dependencies`, and the
+ *    collected `delegations` are what makes re-introducing one fail loudly.
  */
 
 /** Vite's config candidates, in its own precedence order. */
diff --git a/scripts/__tests__/turbo-build-inputs.test.ts b/scripts/__tests__/turbo-build-inputs.test.ts
index f057f1d205..589bf3096a 100644
--- a/scripts/__tests__/turbo-build-inputs.test.ts
+++ b/scripts/__tests__/turbo-build-inputs.test.ts
@@ -172,38 +172,34 @@ describe('turbo `build` inputs cover every out-of-package file (objectui#4185)',
   /**
    * A `pnpm --filter <pkg> build` segment inside a `prebuild` is a task-GRAPH
    * fact, not an inputs fact: the right answer to "this build needs that
-   * package's dist" is `dependsOn: ["^build"]`, which turbo already declares —
-   * but `^build` only orders DECLARED dependencies. Two packages delegate this
-   * way (`apps/site` to `@object-ui/example-schema-catalog`, `packages/components`
-   * to types/core/react), and the derivation deliberately does not walk into
-   * them. That narrowing is sound only while each delegated package is a real
-   * dependency, so assert it rather than assume it.
+   * package's dist" is `dependsOn: ["^build"]`, which turbo already declares
+   * and derives from the dependency graph. A hand-written chain is a SECOND,
+   * unchecked copy of the package's own `dependencies` — and it drifts:
+   * objectui#7292 measured `packages/components`' three-package `prebuild`
+   * against the seven-package closure turbo computes, and a clean worktree's
+   * `pnpm --filter @object-ui/components build` died inside `@object-ui/react`
+   * on the two packages the list had never gained.
+   *
+   * The predecessor of this assertion policed the survivors (each delegated
+   * package must be a declared dependency). That is the weaker guard: a
+   * delegation whose target IS declared still duplicates the graph, still
+   * drifts, and still fails only on the trees nobody looks at. So this ratchets
+   * the class to zero instead. The derivation still COLLECTS delegations —
+   * that is what makes re-introducing one fail here rather than silently widen
+   * an unswept build program.
    */
-  it('every delegated build target is a declared dependency', () => {
+  it('no build lifecycle script delegates to another package with `pnpm --filter`', () => {
     const delegating = DERIVED.filter((pkg) => pkg.program.delegations.length > 0);
     expect(
-      delegating.map((pkg) => pkg.name),
-      'no package delegates a build any more — drop this assertion with the narrowing it ' +
-        'defends, in helpers/build-program.ts',
-    ).not.toHaveLength(0);
-
-    for (const pkg of delegating) {
-      const manifest = JSON.parse(
-        fs.readFileSync(path.join(pkg.dir, 'package.json'), 'utf8'),
-      ) as { dependencies?: Record<string, string>; devDependencies?: Record<string, string> };
-      const declared = new Set([
-        ...Object.keys(manifest.dependencies ?? {}),
-        ...Object.keys(manifest.devDependencies ?? {}),
-      ]);
-      const undeclared = pkg.program.delegations.filter((name) => !declared.has(name));
-      expect(
-        undeclared,
-        `${pkg.name} builds ${undeclared.join(', ')} through a \`pnpm --filter\` lifecycle ` +
-          `script without declaring ${undeclared.length === 1 ? 'it' : 'them'} as a dependency, ` +
-          `so turbo's \`dependsOn: ["^build"]\` does not order the two. Declare the dependency, ` +
-          `or teach build-program.ts to walk into the delegated package's program.`,
-      ).toEqual([]);
-    }
+      delegating.map((pkg) => `${pkg.name} -> ${pkg.program.delegations.join(', ')}`),
+      'a build lifecycle script builds another workspace package through `pnpm --filter`. ' +
+        "That hand-writes a copy of this package's build closure next to the `dependencies` " +
+        'turbo already derives it from, and the two drift silently — the copy is only ever ' +
+        'exercised on a tree where the missing packages happen to be built already. Declare ' +
+        "the dependency in package.json and let turbo's `dependsOn: [\"^build\"]` order it; " +
+        'build the package with `turbo run build --filter=<pkg>`, not `pnpm --filter <pkg> ' +
+        'build`.',
+    ).toEqual([]);
   });
 
   /**
diff --git a/scripts/build-plugin-stylesheet.mjs b/scripts/build-plugin-stylesheet.mjs
index a9356572ab..9c01714f8d 100644
--- a/scripts/build-plugin-stylesheet.mjs
+++ b/scripts/build-plugin-stylesheet.mjs
@@ -284,7 +284,7 @@ export function createPluginStylesheetBuilder({ postcss, tailwind }) {
           "correctly via the `build` task's `dependsOn: [\"^build\"]`; a bare single-package",
           'build does not.',
           '',
-          '  pnpm --filter @object-ui/components build',
+          '  turbo run build --filter=@object-ui/components',
         ].join('\n'),
       );
     }
diff --git a/scripts/shadcn-sync.js b/scripts/shadcn-sync.js
index 24ab51de99..24dbdb6ac9 100755
--- a/scripts/shadcn-sync.js
+++ b/scripts/shadcn-sync.js
@@ -912,7 +912,7 @@ async function updateAllComponents(options = {}) {
     log('2. Fix or roll back — the type-check above failed.', 'dim');
   } else {
     log('2. Test the components: pnpm test', 'dim');
-    log('3. Build the package: pnpm --filter @object-ui/components build', 'dim');
+    log('3. Build the package: turbo run build --filter=@object-ui/components', 'dim');
   }
 }