diff --git a/.pnp.cjs b/.pnp.cjs
index eac53fe03e2..9760baca266 100644
--- a/.pnp.cjs
+++ b/.pnp.cjs
@@ -10336,6 +10336,7 @@ const RAW_RUNTIME_STATE =
           ["@tanstack/react-query", "virtual:efae73f2e9aa11493dde5182b5b7f0894b5c101cb3c916b74523dc0bde92d8579259d43c7f83a5363dbd8939dc3d1e6c45c5965b9191878533d9a2c19b046d70#npm:5.74.7"],\
           ["@types/dompurify", "npm:3.0.2"],\
           ["@types/git-url-parse", "npm:9.0.0"],\
+          ["@types/jest", "npm:28.1.6"],\
           ["@types/markdown-it", "npm:12.2.3"],\
           ["@types/marked", "npm:5.0.0"],\
           ["@types/mdast", "npm:4.0.3"],\
@@ -10362,6 +10363,7 @@ const RAW_RUNTIME_STATE =
           ["@yarnpkg/pnpify", "workspace:packages/yarnpkg-pnpify"],\
           ["@yarnpkg/sdks", "workspace:packages/yarnpkg-sdks"],\
           ["@yarnpkg/shell", "workspace:packages/yarnpkg-shell"],\
+          ["ajv", "npm:8.17.1"],\
           ["algoliasearch", "npm:4.22.1"],\
           ["ansi-to-html", "npm:0.7.2"],\
           ["clipanion", "virtual:576bf3e379b293160348e4cadfbd6541796e6f78477b0875c4437065090cec6f78b6ec2281b8e15d1c870d61578dc7dee16a5ae49a65701fec83e592ce2ebdeb#npm:4.0.0-rc.2"],\
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index d495766b4f8..ed461c7feed 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -6,7 +6,8 @@
     "build": "docusaurus build",
     "swizzle": "docusaurus swizzle",
     "clear": "docusaurus clear",
-    "serve": "docusaurus serve"
+    "serve": "docusaurus serve",
+    "test:schema": "run test:unit packages/docusaurus"
   },
   "dependencies": {
     "@docusaurus/core": "^3.7.0",
@@ -79,6 +80,7 @@
     "@docusaurus/types": "^3.7.0",
     "@types/dompurify": "^3",
     "@types/git-url-parse": "^9.0.0",
+    "@types/jest": "^28.1.6",
     "@types/markdown-it": "^12.2.3",
     "@types/marked": "^5.0.0",
     "@types/mdast": "^4.0.3",
@@ -91,6 +93,7 @@
     "@types/resolve": "^1.20.0",
     "@types/semver": "^7.1.0",
     "@types/three": "^0.144.0",
+    "ajv": "^8.17.1",
     "clipanion": "^4.0.0-rc.2",
     "mdast-util-mdx-jsx": "^3.0.0",
     "unified": "^11.0.4"
diff --git a/packages/docusaurus/static/configuration/yarnrc.json b/packages/docusaurus/static/configuration/yarnrc.json
index 49d0e161996..97ed444e8d1 100644
--- a/packages/docusaurus/static/configuration/yarnrc.json
+++ b/packages/docusaurus/static/configuration/yarnrc.json
@@ -273,7 +273,7 @@
     "httpTimeout": {
       "_package": "@yarnpkg/core",
       "title": "Amount of time to wait before cancelling pending HTTP requests.",
-      "type": "mixed",
+      "type": ["number", "string"],
       "oneOf": [
         { "type": "number" },
         { "type": "string", "pattern": "^(\\d*\\.?\\d+)(ms|s|m|h|d|w)?$" }
@@ -487,7 +487,7 @@
       "_package": "@yarnpkg/core",
       "title": "Minimum age of a package version according to the publish date on the npm registry to be considered for installation.",
       "description": "If a package version is newer than the minimal age gate, it will not be considered for installation. This can be used to reduce the likelihood of installing compromised packages, or to avoid relying on packages that could still be unpublished (e.g. the npm registry has specific rules for packages less than 3 days old).",
-      "type": "mixed",
+      "type": ["number", "string"],
       "oneOf": [
         { "type": "number" },
         { "type": "string", "pattern": "^(\\d*\\.?\\d+)(ms|s|m|h|d|w)?$" }
@@ -861,7 +861,7 @@
       "_package": "@yarnpkg/core",
       "title": "Define the minimal amount of time between two telemetry events.",
       "description": "By default we only send one request per week, making it impossible for us to track your usage with a lower granularity.",
-      "type": "mixed",
+      "type": ["number", "string"],
       "oneOf": [
         { "type": "number" },
         { "type": "string", "pattern": "^(\\d*\\.?\\d+)(ms|s|m|h|d|w)?$" }
diff --git a/packages/docusaurus/tests/schema.test.ts b/packages/docusaurus/tests/schema.test.ts
new file mode 100644
index 00000000000..c7640a360a2
--- /dev/null
+++ b/packages/docusaurus/tests/schema.test.ts
@@ -0,0 +1,24 @@
+import Ajv2019         from 'ajv/dist/2019';
+import draft2019Schema from 'ajv/dist/refs/json-schema-2019-09/schema.json';
+
+import manifestSchema  from '../static/configuration/manifest.json';
+import yarnRcSchema    from '../static/configuration/yarnrc.json';
+
+const ajv = new Ajv2019();
+const validate = ajv.compile(draft2019Schema);
+
+describe(`manifest.json`, () => {
+  it(`is a valid JSON Schema`, () => {
+    const result = validate(manifestSchema);
+    expect(validate.errors).toBeNull();
+    expect(result).toBe(true);
+  });
+});
+
+describe(`yarnrc.json`, () => {
+  it(`is a valid JSON Schema`, () => {
+    const result = validate(yarnRcSchema);
+    expect(validate.errors).toBeNull();
+    expect(result).toBe(true);
+  });
+});
diff --git a/yarn.lock b/yarn.lock
index d782855fdd1..b92ba35bcde 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5957,6 +5957,7 @@ __metadata:
     "@tanstack/react-query": "npm:^5.74.7"
     "@types/dompurify": "npm:^3"
     "@types/git-url-parse": "npm:^9.0.0"
+    "@types/jest": "npm:^28.1.6"
     "@types/markdown-it": "npm:^12.2.3"
     "@types/marked": "npm:^5.0.0"
     "@types/mdast": "npm:^4.0.3"
@@ -5982,6 +5983,7 @@ __metadata:
     "@yarnpkg/pnpify": "workspace:^"
     "@yarnpkg/sdks": "workspace:^"
     "@yarnpkg/shell": "workspace:^"
+    ajv: "npm:^8.17.1"
     algoliasearch: "npm:^4.14.2"
     ansi-to-html: "npm:^0.7.2"
     clipanion: "npm:^4.0.0-rc.2"
@@ -6848,7 +6850,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ajv@npm:^8.0.0, ajv@npm:^8.9.0":
+"ajv@npm:^8.0.0, ajv@npm:^8.17.1, ajv@npm:^8.9.0":
   version: 8.17.1
   resolution: "ajv@npm:8.17.1"
   dependencies: