diff --git a/schemas/install-manifest.schema.json b/schemas/install-manifest.schema.json
index 16fc1efb..b5dbf3fb 100644
--- a/schemas/install-manifest.schema.json
+++ b/schemas/install-manifest.schema.json
@@ -592,6 +592,153 @@
               "minLength": 1
             },
             "uniqueItems": true
+          },
+          "absent_claims": {
+            "description": "Cores that want this destination and have nothing held, after the cores served here: a narrowing that keeps none of those takes the first named one as a file left out, as a pack built for it lists it.",
+            "type": "array",
+            "minItems": 1,
+            "items": {
+              "type": "object",
+              "additionalProperties": false,
+              "required": [
+                "name",
+                "system",
+                "required",
+                "reason",
+                "cores"
+              ],
+              "properties": {
+                "name": {
+                  "type": "string",
+                  "minLength": 1
+                },
+                "system": {
+                  "type": "string"
+                },
+                "required": {
+                  "type": "boolean"
+                },
+                "reason": {
+                  "enum": [
+                    "hash_mismatch",
+                    "not_found",
+                    "external",
+                    "user_provided",
+                    "no_platform_slug"
+                  ]
+                },
+                "cores": {
+                  "oneOf": [
+                    {
+                      "type": "null"
+                    },
+                    {
+                      "type": "array",
+                      "items": {
+                        "type": "string"
+                      },
+                      "uniqueItems": true
+                    }
+                  ]
+                },
+                "regions": {
+                  "description": "The regions the emulator code selects the file for. Absent when it never competes.",
+                  "type": "array",
+                  "items": {
+                    "type": "string",
+                    "enum": [
+                      "argentina",
+                      "asia",
+                      "asia-ntsc",
+                      "asia-pal",
+                      "australia",
+                      "brazil",
+                      "canada",
+                      "china",
+                      "denmark",
+                      "europe",
+                      "finland",
+                      "france",
+                      "germany",
+                      "greece",
+                      "hong-kong",
+                      "india",
+                      "italy",
+                      "japan",
+                      "latin-america",
+                      "mexico",
+                      "netherlands",
+                      "new-zealand",
+                      "north-america",
+                      "norway",
+                      "oceania",
+                      "poland",
+                      "portugal",
+                      "russia",
+                      "singapore",
+                      "south-korea",
+                      "spain",
+                      "sweden",
+                      "taiwan",
+                      "uk",
+                      "world"
+                    ]
+                  },
+                  "minItems": 1,
+                  "maxItems": 1000,
+                  "uniqueItems": true
+                },
+                "region_groups": {
+                  "description": "Groups the file competes in as a core extra, whatever systems are chosen.",
+                  "type": "array",
+                  "items": {
+                    "type": "string",
+                    "minLength": 1,
+                    "maxLength": 256
+                  },
+                  "minItems": 1,
+                  "maxItems": 1000,
+                  "uniqueItems": true
+                },
+                "region_system_groups": {
+                  "description": "Groups the file competes in as the platform's own declaration: present only when that system is kept.",
+                  "type": "array",
+                  "items": {
+                    "type": "string",
+                    "minLength": 1,
+                    "maxLength": 256
+                  },
+                  "minItems": 1,
+                  "maxItems": 1000,
+                  "uniqueItems": true
+                },
+                "systems": {
+                  "description": "Every platform system that declares the file, for the installer's --system.",
+                  "type": "array",
+                  "items": {
+                    "type": "string",
+                    "minLength": 1,
+                    "maxLength": 256
+                  },
+                  "minItems": 1,
+                  "maxItems": 1000,
+                  "uniqueItems": true
+                },
+                "priority": {
+                  "description": "The rank the code searches the file at, lower first: a world file withdraws an unmatched regional one only when it ranks no worse.",
+                  "type": "integer"
+                },
+                "declared_in": {
+                  "description": "The platform systems declaring the file, when fewer than `systems`, which also names the systems whose cores read it there.",
+                  "type": "array",
+                  "items": {
+                    "type": "string",
+                    "minLength": 1
+                  },
+                  "uniqueItems": true
+                }
+              }
+            }
           }
         },
         "oneOf": [
diff --git a/tests/test_audit_regressions.py b/tests/test_audit_regressions.py
index 14fedc5e..bc7dc260 100644
--- a/tests/test_audit_regressions.py
+++ b/tests/test_audit_regressions.py
@@ -3584,5 +3584,19 @@ class AFileToSourceIsAFileNotAName(unittest.TestCase):
         self.assertEqual(_first_hash({}), "")
 
 
+
+class GeneratedArtifactsMeetTheirSchemas(unittest.TestCase):
+    """A manifest field added without its schema passed every local test
+    and failed the site deploy, which is the first run of the full check."""
+
+    @unittest.skipUnless(HAS_JSONSCHEMA, "needs jsonschema")
+    def test_the_full_schema_check_passes(self):
+        proc = subprocess.run(
+            [sys.executable, "scripts/validate_schemas.py"], cwd=ROOT,
+            capture_output=True, text=True, timeout=600,
+        )
+        self.assertEqual(proc.returncode, 0, proc.stdout + proc.stderr)
+
+
 if __name__ == "__main__":
     unittest.main()