diff --git a/.github/workflows/parity-governance.yml b/.github/workflows/parity-governance.yml
index c266946f24..2f7e82e65c 100644
--- a/.github/workflows/parity-governance.yml
+++ b/.github/workflows/parity-governance.yml
@@ -73,11 +73,12 @@ jobs:
             tests.test_parity_ledger \
             tests.test_parity_governance_acceptance \
             tests.test_rr_legacy_preservation_contract \
+            tests.test_parity_disposition_kinds \
             2>&1 | tee "$RUNNER_TEMP/out.txt"
           ran=$(grep -oE '^Ran [0-9]+ test' "$RUNNER_TEMP/out.txt" | grep -oE '[0-9]+')
           echo "collected ${ran:-0} tests"
-          if [ "${ran:-0}" -lt 113 ]; then
-            echo "::error::expected at least 113 parity-governance tests, collected ${ran:-0} — discovery is broken, not the suite"
+          if [ "${ran:-0}" -lt 115 ]; then
+            echo "::error::expected at least 115 parity-governance tests, collected ${ran:-0} — discovery is broken, not the suite"
             exit 1
           fi
         working-directory: Tools
diff --git a/Tools/parity_ratchet.py b/Tools/parity_ratchet.py
index 5129c1a5ef..7ba321bc00 100644
--- a/Tools/parity_ratchet.py
+++ b/Tools/parity_ratchet.py
@@ -346,14 +346,19 @@ def _required_v3_exemptions(
     current_findings: set[str],
 ) -> set[tuple[str, str]]:
     required: set[tuple[str, str]] = set()
-    for name in (
-        "unpaired_files",
-        "unpaired_functions",
-        "unpaired_properties",
-        "unpaired_constants",
+    # Explicit singulars rather than name[:-1]: "unpaired_properties" stems to
+    # "unpaired-propertie", which _validate_dispositions does not accept, so a one-sided
+    # property could be REQUIRED to carry a disposition that could never be written. Every
+    # other set survives the naive strip, which is why this went unnoticed: no test had a
+    # one-sided property until Lift Log added two.
+    for name, singular in (
+        ("unpaired_files", "unpaired-file"),
+        ("unpaired_functions", "unpaired-function"),
+        ("unpaired_properties", "unpaired-property"),
+        ("unpaired_constants", "unpaired-constant"),
     ):
         for identity in set(current_sets[name]) - set(base_sets[name]):
-            required.add((f"add-{name[:-1].replace('_', '-')}", identity))
+            required.add((f"add-{singular}", identity))
     for name in ("function_pairs", "property_pairs", "constant_pairs"):
         for identity in set(base_sets[name]) - set(current_sets[name]):
             required.add((f"remove-{name[:-1].replace('_', '-')}", identity))
diff --git a/Tools/tests/test_parity_disposition_kinds.py b/Tools/tests/test_parity_disposition_kinds.py
new file mode 100644
index 0000000000..a0dea4aff1
--- /dev/null
+++ b/Tools/tests/test_parity_disposition_kinds.py
@@ -0,0 +1,64 @@
+"""Every kind the ratchet can REQUIRE must be a kind a disposition may declare.
+
+`_required_v3_exemptions` builds its kind strings from the set names, and
+`_validate_dispositions` accepts a fixed vocabulary. If those drift apart, the
+requirement becomes unsatisfiable: the required kind is rejected by validation,
+and the accepted kind never matches the requirement, so the debt can neither be
+waived nor cleared and `--refresh-derived` refuses forever.
+
+That happened with `unpaired_properties`, which a naive `name[:-1]` stems to
+`unpaired-propertie`. Every other set survives the strip, which is why no test
+caught it until a one-sided property first appeared.
+"""
+import sys
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+import parity_ledger
+import parity_ratchet
+
+
+class DispositionKindVocabularyTests(unittest.TestCase):
+    EMPTY = {
+        "unpaired_files": [], "unpaired_functions": [], "unpaired_properties": [],
+        "unpaired_constants": [], "function_pairs": [], "property_pairs": [],
+        "constant_pairs": [],
+    }
+
+    def _required_kinds(self) -> set[str]:
+        current = dict(self.EMPTY)
+        identity = "swift" + chr(0) + "X.swift::a/1#1"
+        for name in ("unpaired_files", "unpaired_functions",
+                     "unpaired_properties", "unpaired_constants"):
+            current[name] = [identity]
+        required = parity_ratchet._required_v3_exemptions(
+            self.EMPTY, current, set(), set()
+        )
+        return {kind for kind, _ in required}
+
+    def test_every_required_add_kind_is_declarable(self) -> None:
+        identity = "swift" + chr(0) + "X.swift::a/1#1"
+        for kind in sorted(self._required_kinds()):
+            doc = {
+                "schema_version": 1,
+                "dispositions": [{
+                    "type": "platform_specific",
+                    "kind": kind,
+                    "identity": identity,
+                    "identity_sha256": parity_ledger._canonical_sha256(identity),
+                    "platform": "swift",
+                    "rationale": "Declared one-sided on purpose for this vocabulary test.",
+                }],
+            }
+            with self.subTest(kind=kind):
+                parity_ratchet._validate_dispositions(doc, "test")
+
+    def test_property_kind_is_singular(self) -> None:
+        self.assertIn("add-unpaired-property", self._required_kinds())
+        self.assertNotIn("add-unpaired-propertie", self._required_kinds())
+
+
+if __name__ == "__main__":
+    unittest.main()