--- a/testing/mozharness/external_tools/performance-artifact-schema.json
+++ b/testing/mozharness/external_tools/performance-artifact-schema.json
@@ -13,47 +13,57 @@
             "properties": {
                 "name": {
                     "title": "Subtest name",
                     "type": "string"
                 },
                 "value": {
                     "description": "Summary value for subtest",
                     "title": "Subtest value",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": -1000000000000.0,
+                    "maximum": 1000000000000.0
                 },
                 "lowerIsBetter": {
                     "description": "Whether lower values are better for subtest",
                     "title": "Lower is better",
                     "type": "boolean"
                 },
                 "shouldAlert": {
                     "description": "Whether we should alert",
                     "title": "Should alert",
                     "type": "boolean"
                 },
                 "alertThreshold": {
                     "description": "% change threshold before alerting",
                     "title": "Alert threshold",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": 0.0,
+                    "maximum": 1000.0
                 },
                 "minBackWindow": {
                     "description": "Minimum back window to use for alerting",
                     "title": "Minimum back window",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": 1,
+                    "maximum": 255
                 },
                 "maxBackWindow": {
                     "description": "Maximum back window to use for alerting",
                     "title": "Maximum back window",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": 1,
+                    "maximum": 255
                 },
                 "foreWindow": {
                     "description": "Fore window to use for alerting",
                     "title": "Fore window",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": 1,
+                    "maximum": 255
                 }
             },
             "required": [
                 "name",
                 "value"
             ],
             "type": "object"
         },
@@ -75,47 +85,57 @@
                     "items": {
                         "$ref": "#/definitions/subtest_schema"
                     },
                     "title": "Subtests",
                     "type": "array"
                 },
                 "value": {
                     "title": "Suite value",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": -1000000000000.0,
+                    "maximum": 1000000000000.0
                 },
                 "lowerIsBetter": {
                     "description": "Whether lower values are better for suite",
                     "title": "Lower is better",
                     "type": "boolean"
                 },
                 "shouldAlert": {
                     "description": "Whether we should alert on this suite (overrides default behaviour)",
                     "title": "Should alert",
                     "type": "boolean"
                 },
                 "alertThreshold": {
                     "description": "% change threshold before alerting",
                     "title": "Alert threshold",
-                    "type": "number"
+                    "type": "number",
+                    "minimum": 0.0,
+                    "maximum": 1000.0
                 },
                 "minBackWindow": {
                     "description": "Minimum back window to use for alerting",
                     "title": "Minimum back window",
-                    "type": "number"
+                    "type": "integer",
+                    "minimum": 1,
+                    "maximum": 255
                 },
                 "maxBackWindow": {
                     "description": "Maximum back window to use for alerting",
                     "title": "Maximum back window",
-                    "type": "number"
+                    "type": "integer",
+                    "minimum": 1,
+                    "maximum": 255
                 },
                 "foreWindow": {
                     "description": "Fore window to use for alerting",
                     "title": "Fore window",
-                    "type": "number"
+                    "type": "integer",
+                    "minimum": 1,
+                    "maximum": 255
                 }
             },
             "required": [
                 "name",
                 "subtests"
             ],
             "type": "object"
         }