diff --git a/tests/test_stamp_native_hooks.py b/tests/test_stamp_native_hooks.py
index 6e202b582b..3d2d9aae11 100644
--- a/tests/test_stamp_native_hooks.py
+++ b/tests/test_stamp_native_hooks.py
@@ -6,6 +6,7 @@ import subprocess
 import tempfile
 import unittest
 from pathlib import Path
+from unittest.mock import patch
 
 SPEC = importlib.util.spec_from_file_location(
     "stamp_native_hooks", Path(__file__).resolve().parents[1] / "tools/stamp_native_hooks.py"
@@ -88,6 +89,84 @@ class StampTests(unittest.TestCase):
         self.assertEqual(json.loads((self.root / stamp.CATALOG).read_text())["hooks"], [])
         self.assertEqual(json.loads((self.root / stamp.CATALOG).read_text())["helpers"], fragment["helpers"])
 
+    def test_selected_fragments_keep_merge_order_and_others_stay_pending(self):
+        self.git("add", ".")
+        self.git("commit", "-qm", "base")
+        # An older, unfinished API must not stop two later, reviewed APIs being registered.
+        for name in ("blocked", "z", "a"):
+            self.fragment(name)
+            self.git("add", ".")
+            self.git("commit", "-qm", name)
+        blocked = self.root / stamp.FRAGMENTS / "blocked.json"
+        pending_comment = self.root / "pending.rs"
+        pending_comment.write_text("/// Since API @API:blocked@.\n")
+        fragment = json.loads(blocked.read_text())
+        fragment["comments"] = ["pending.rs"]
+        blocked.write_text(json.dumps(fragment))
+        api = self.root / stamp.MOD_API
+        api.write_text("/// APIs @API:blocked@, @API:z@ and @API:a@.\n")
+        before = {path: path.read_bytes() for path in (blocked, pending_comment)}
+
+        # CLI order must not override merge order; duplicate selections must not consume numbers.
+        self.assertFalse(stamp.stamp(False, ["a", "z", "a"]))
+        source = (self.root / stamp.SOURCE).read_text()
+        self.assertIn("API 8 adds z.", source)
+        self.assertIn("API 9 adds a.", source)
+        self.assertIn("NATIVE_HOOKS_API: u32 = 9;", source)
+        self.assertEqual(api.read_text(), "/// APIs @API:blocked@, 8 and 9.\n")
+        docs = (self.root / stamp.DOCS).read_text()
+        self.assertIn("API 8 adds z; requires 8.", docs)
+        self.assertIn("API 9 adds a; requires 9.", docs)
+        self.assertEqual({path: path.read_bytes() for path in before}, before)
+        self.assertEqual(sorted(path.stem for path in blocked.parent.glob("*.json")), ["blocked"])
+        hooks = json.loads((self.root / stamp.CATALOG).read_text())["hooks"]
+        self.assertEqual([h["name"] for h in hooks], ["a", "z"])
+
+        # Once ready, the skipped API gets the next free number, even though it merged first.
+        self.assertTrue(stamp.stamp(True))
+        self.assertFalse(stamp.stamp(False))
+        self.assertIn("API 10 adds blocked.", (self.root / stamp.SOURCE).read_text())
+        self.assertIn("API 10 adds blocked; requires 10.", (self.root / stamp.DOCS).read_text())
+        self.assertEqual(api.read_text(), "/// APIs 10, 8 and 9.\n")
+        self.assertEqual(pending_comment.read_text(), "/// Since API 10.\n")
+        hooks = json.loads((self.root / stamp.CATALOG).read_text())["hooks"]
+        self.assertEqual([h["name"] for h in hooks], ["a", "z", "blocked"])
+        self.assertFalse(stamp.stamp(False))
+
+    def test_selection_rejects_unknown_names_before_writing_even_in_check_mode(self):
+        path = self.fragment("ready")
+        before = {p: p.read_bytes() for p in self.root.rglob("*") if p.is_file()}
+        for check in (False, True):
+            with self.subTest(check=check):
+                with self.assertRaisesRegex(ValueError, "unknown pending fragment.*typo"):
+                    stamp.stamp(check, ["ready", "typo"])
+                self.assertEqual({p: p.read_bytes() for p in before}, before)
+        path.unlink()
+        with self.assertRaisesRegex(ValueError, "unknown pending fragment.*ready"):
+            stamp.stamp(False, ["ready"])
+
+    def test_selection_cli_check_is_read_only_and_can_stamp_helper_only(self):
+        self.git("add", ".")
+        self.git("commit", "-qm", "base")
+        path = self.fragment("ready")
+        fragment = json.loads(path.read_text())
+        fragment["hooks"] = []
+        fragment["helpers"] = [{"name": "helper", "target": "target::helper"}]
+        path.write_text(json.dumps(fragment))
+        blocked = self.fragment("blocked")
+        before = {p: p.read_bytes() for p in self.root.rglob("*") if p.is_file()}
+        with patch("sys.argv", ["stamp_native_hooks.py", "--check", "--only", "ready"]):
+            self.assertEqual(stamp.main(), 1)
+        self.assertEqual({p: p.read_bytes() for p in before}, before)
+        with patch("sys.argv", ["stamp_native_hooks.py", "--only", "ready"]):
+            self.assertEqual(stamp.main(), 0)
+        catalog = json.loads((self.root / stamp.CATALOG).read_text())
+        self.assertEqual(catalog["hooks"], [])
+        self.assertEqual(catalog["helpers"], fragment["helpers"])
+        self.assertIn("NATIVE_HOOKS_API: u32 = 8;", (self.root / stamp.SOURCE).read_text())
+        self.assertFalse(path.exists())
+        self.assertEqual(blocked.read_bytes(), before[blocked])
+
     def test_catalog_facts_travel_with_the_hook(self):
         self.git("add", ".")
         self.git("commit", "-qm", "base")
diff --git a/tools/native-hook-fragments/README.md b/tools/native-hook-fragments/README.md
index 03ea29c508..37f95431e3 100644
--- a/tools/native-hook-fragments/README.md
+++ b/tools/native-hook-fragments/README.md
@@ -26,7 +26,23 @@ not API yet; do not depend on it until it has a number.
 
 After hook PRs merge, run `python3 tools/stamp_native_hooks.py` on current
 main and open a PR with the result. The tool assigns one API number per
-fragment in first-parent merge order. It consumes all pending fragments.
-`--check` exits nonzero when any are pending. Running the tool again does
-nothing. For local testing only, run it on a hook branch without committing
+fragment in first-parent merge order. By default it consumes all pending
+fragments; running it again does nothing. `--check` exits nonzero when any
+are pending.
+
+To register reviewed fragments while unrelated contracts are still being
+settled, select their names without `.json`:
+
+```sh
+python3 tools/stamp_native_hooks.py --only gui_render_post client_services
+```
+
+Only the selected fragments get numbers, still in merge order regardless of
+argument order. All others and their markers remain pending; a later stamp
+continues from the current API number. Missing names (including already
+stamped ones) fail before writing anything. `--check --only ...` checks the
+selection without changing files. Selection does not check dependencies:
+include any pending contracts the selected APIs require.
+
+For local testing only, run the tool on a hook branch without committing
 the result. If another stamp PR merges first, regenerate from current main.
diff --git a/tools/stamp_native_hooks.py b/tools/stamp_native_hooks.py
index ddbac2dd01..2b81298642 100644
--- a/tools/stamp_native_hooks.py
+++ b/tools/stamp_native_hooks.py
@@ -16,8 +16,14 @@ CATALOG = Path("native-hooks.json")
 MOD_API = Path("crates/horizon-client/src/mod_api.rs")
 
 
-def stamp(check):
+def stamp(check, only=None):
     paths = sorted((ROOT / FRAGMENTS).glob("*.json"))
+    if only is not None:
+        selected = set(only)
+        missing = selected - {path.stem for path in paths}
+        if missing:
+            raise ValueError(f"unknown pending fragment(s): {', '.join(sorted(missing))}")
+        paths = [path for path in paths if path.stem in selected]
     if not paths:
         return False
     if check:
@@ -45,7 +51,7 @@ def stamp(check):
     names = {hook["name"] for hook in catalog["hooks"]}
     helper_names = {helper["name"] for helper in catalog.get("helpers", [])}
     extra = {}
-    # Match the build-time generator's fragment order so stamping preserves the generated API.
+    # Append the selected entries in filename order, as the build-time generator reads fragments.
     for path in sorted(ordered):
         fragment = json.loads(path.read_text())
         for hook in fragment["hooks"]:
@@ -109,9 +115,11 @@ def stamp(check):
 def main():
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--check", action="store_true", help="fail if fragments are pending")
+    parser.add_argument("--only", nargs="+", metavar="FRAGMENT",
+                        help="stamp only these pending fragment names (without .json), in merge order")
     args = parser.parse_args()
     try:
-        return int(stamp(args.check))
+        return int(stamp(args.check, args.only))
     except (ValueError, KeyError, OSError, subprocess.CalledProcessError) as error:
         print(f"stamp_native_hooks: {error}", file=sys.stderr)
         return 1