diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 2956d92..3345513 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -78,8 +78,10 @@ jobs:
         working-directory: source
         run: |
           set -euo pipefail
-          git fetch origin
-          if git show-ref --verify --quiet refs/remotes/origin/coverage-pages; then
+          retained_ref="$(git ls-remote --heads origin refs/heads/coverage-pages)"
+          if [[ -n "${retained_ref}" ]]; then
+            git fetch --no-tags --depth=1 origin \
+              +refs/heads/coverage-pages:refs/remotes/origin/coverage-pages
             git worktree add ../site -B coverage-pages origin/coverage-pages
           else
             git worktree add --detach ../site
@@ -118,6 +120,7 @@ jobs:
           RELEASE_TAG: ${{ steps.release.outputs.tag }}
         run: |
           set -euo pipefail
+          python3 source/tools/site_storage.py site
           git -C site config user.name 'github-actions[bot]'
           git -C site config user.email '41898282+github-actions[bot]@users.noreply.github.com'
           git -C site add --all
@@ -128,6 +131,7 @@ jobs:
           mkdir -p public
           rsync --archive --exclude='.git' site/ public/
           python3 source/tools/site_artwork.py source/docs/assets public
+          python3 source/tools/site_storage.py public
       - uses: actions/configure-pages@v6
       - uses: actions/upload-pages-artifact@v5
         with:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0cf3d95..833cd4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # 0.6.2
 
+- Fetch shallow publication snapshots and report complete site size with a 250 MB advisory budget.
+
 # 0.6.1
 
 * Transferred the canonical repository from `helly25/bashtest` to
diff --git a/docs/infrastructure.md b/docs/infrastructure.md
index 0953b4e..c29fb21 100644
--- a/docs/infrastructure.md
+++ b/docs/infrastructure.md
@@ -39,6 +39,20 @@ be retried independently; its failure does not require recreating a release or m
 Release helpers, numeric tags, and version agreement keep their existing contracts. No module
 dependency versions change in this rollout.
 
+### Published-site budget
+
+Each publisher fetches only the latest `coverage-pages` snapshot with `--depth=1` and no tags.
+`storage-report.json` measures the complete retained tree before committing and the staged tree
+again after deployment-only artwork. It records file counts and bytes by top-level directory,
+excluding Git metadata and the report itself. Release pages and assets are not changed.
+
+Publication warns at **250 MB**. An emergency **9 GB** payload guard leaves TAR packaging headroom;
+GitHub's [supported published-site limit](https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits)
+remains **1 GB**, so the emergency guard is not an operating target. Review growth before reaching
+that limit. This repository does not currently publish coverage, so no coverage retention or
+browser loader is introduced. Git history, build caches, and Actions artifacts are separate budgets.
+The change follows [mbo PR #549](https://github.com/mboworks/mbo/pull/549).
+
 ## Contributor rules and verification
 
 `AGENTS.md`, `GIT_RULES.md`, and `STYLE_SH.md` synchronize applicable shared rules. `RULES.md`
diff --git a/tools/site_storage.py b/tools/site_storage.py
new file mode 100644
index 0000000..cbd2776
--- /dev/null
+++ b/tools/site_storage.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: Copyright (c) M. Boerger, the MBO Works authors
+# SPDX-License-Identifier: Apache-2.0
+"""Measure the complete publication tree without changing retained releases."""
+
+import argparse
+import json
+from pathlib import Path
+
+
+def sizes(root):
+    result = {}
+    for path in root.rglob('*'):
+        relative = path.relative_to(root)
+        if '.git' in relative.parts or relative.as_posix() == 'storage-report.json' or not path.is_file():
+            continue
+        section = relative.parts[0] if len(relative.parts) > 1 else 'root'
+        stats = result.setdefault(section, {'files': 0, 'bytes': 0})
+        stats['files'] += 1
+        stats['bytes'] += path.stat().st_size
+    return result
+
+
+def report(root):
+    result = sizes(root)
+    total = sum(entry['bytes'] for entry in result.values())
+    report = {'schema': 1, 'total_bytes': total, 'sections': result,
+              'review_bytes': 250_000_000}
+    (root / 'storage-report.json').write_text(json.dumps(report, indent=2) + '\n')
+    print(json.dumps(report, indent=2), flush=True)
+    if total >= report['review_bytes']:
+        print('::warning::Published site reached 250 MB; review storage-report.json and docs/infrastructure.md.')
+    if total > 9_000_000_000:
+        raise ValueError('Published site exceeds the Pages deployment ceiling')
+    return report
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('root', type=Path)
+    args = parser.parse_args()
+    report(args.root)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tools/site_storage_test.py b/tools/site_storage_test.py
new file mode 100644
index 0000000..001a406
--- /dev/null
+++ b/tools/site_storage_test.py
@@ -0,0 +1,63 @@
+# SPDX-FileCopyrightText: Copyright (c) M. Boerger, the MBO Works authors
+# SPDX-License-Identifier: Apache-2.0
+"""Publication accounting preserves every release and measures both trees."""
+
+import contextlib
+import io
+import json
+from pathlib import Path
+import tempfile
+import unittest
+from unittest import mock
+
+import site_storage
+
+
+class SiteStorageTest(unittest.TestCase):
+    def test_complete_tree_accounting_preserves_releases_and_is_repeatable(self):
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            files = {'site/tag/1.2.3/index.html': b'release page', 'schema/v1.json': b'{}',
+                     'favicon.ico': b'icon', '.git/objects/private': b'not deployed'}
+            for name, data in files.items():
+                path = root / name
+                path.parent.mkdir(parents=True, exist_ok=True)
+                path.write_bytes(data)
+            with contextlib.redirect_stdout(io.StringIO()):
+                result = site_storage.report(root)
+                again = site_storage.report(root)
+            self.assertEqual(result, again)
+            self.assertEqual(result['total_bytes'], 18)
+            self.assertEqual(result['sections']['site'], {'files': 1, 'bytes': 12})
+            self.assertNotIn('.git', result['sections'])
+            self.assertEqual(json.loads((root / 'storage-report.json').read_text()), result)
+            for name, data in files.items():
+                self.assertEqual((root / name).read_bytes(), data)
+
+    def test_advisory_and_emergency_payload_boundaries(self):
+        with tempfile.TemporaryDirectory() as directory:
+            for size, warns, fails in ((249_999_999, False, False), (250_000_000, True, False),
+                                       (9_000_000_000, True, False), (9_000_000_001, True, True)):
+                with self.subTest(size=size), mock.patch.object(
+                        site_storage, 'sizes', return_value={'site': {'files': 1, 'bytes': size}}):
+                    output = io.StringIO()
+                    with contextlib.redirect_stdout(output):
+                        if fails:
+                            with self.assertRaisesRegex(ValueError, 'deployment ceiling'):
+                                site_storage.report(Path(directory))
+                        else:
+                            site_storage.report(Path(directory))
+                    self.assertEqual('::warning::' in output.getvalue(), warns)
+
+    def test_publisher_measures_before_commit_and_after_artwork_with_shallow_fetch(self):
+        source = (Path(__file__).resolve().parent.parent / '.github/workflows/pages.yml').read_text()
+        self.assertLess(source.index('site_storage.py site'), source.index('git -C site commit'))
+        self.assertLess(source.index('site_artwork.py'), source.index('site_storage.py public'))
+        self.assertLess(source.index('site_storage.py public'), source.index('uses: actions/upload-pages-artifact@'))
+        self.assertIn('git fetch --no-tags --depth=1 origin', source)
+        self.assertIn('git ls-remote --heads origin refs/heads/coverage-pages', source)
+        self.assertNotIn('git fetch origin\n', source)
+
+
+if __name__ == '__main__':
+    unittest.main()