diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..c663465d
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: yarn
+
+      - name: Expand liquid
+        run: yarn expand-liquid
+
+      - name: Validate schemas
+        run: yarn validate-schemas
diff --git a/package.json b/package.json
index 3677e6ae..e4fdae70 100644
--- a/package.json
+++ b/package.json
@@ -9,10 +9,12 @@
     "@graphql-codegen/cli": "^3.2.2",
     "@graphql-codegen/typescript": "^3.0.2",
     "@graphql-codegen/typescript-operations": "^3.0.2",
-    "graphql": "^16.6.0"
+    "graphql": "^16.6.0",
+    "ajv": "8.17.1"
   },
   "scripts": {
     "expand-liquid": "node ./util/expand-liquid.js",
+    "validate-schemas": "node ./util/validate-schemas.js",
     "typegen": "yarn workspaces run graphql-code-generator --config package.json",
     "test-js": "yarn expand-liquid vanilla-js && yarn && yarn typegen && yarn workspaces run test run",
     "test-ts": "yarn expand-liquid typescript && yarn && yarn typegen && yarn workspaces run test run"
diff --git a/util/validate-schemas.js b/util/validate-schemas.js
new file mode 100644
index 00000000..1ce41e59
--- /dev/null
+++ b/util/validate-schemas.js
@@ -0,0 +1,130 @@
+import fs from 'node:fs/promises';
+import path from 'node:path';
+
+import toml from '@iarna/toml';
+import Ajv from 'ajv';
+
+const schema = {
+    type: 'object',
+    properties: {
+        api_version: {
+            type: 'string',
+            pattern: '^(202\\d{1}-\\d{2}|unstable)$', // Matches "202X-XX" format
+        },
+        extensions: {
+            type: 'array',
+            items: {
+                type: 'object',
+                properties: {
+                    description: { type: 'string' },
+                    handle: { type: 'string' },
+                    name: { type: 'string' },
+                    type: { type: 'string' },
+                    // build: {
+                    //     type: 'object',
+                    //     properties: {
+                    //         command: { type: 'string' },
+                    //         path: { type: 'string' },
+                    //         additionalProperties: true, // Allow other properties in build
+                    //     },
+                    //     required: ['command', 'path'],
+                    // },
+                    // ui: {
+                    //     type: 'object',
+                    //     properties: {
+                    //         paths: {
+                    //             type: 'object',
+                    //             properties: {
+                    //                 create: { type: 'string' },
+                    //                 details: { type: 'string' },
+                    //                 additionalProperties: { type: 'string' }, // Allow other paths
+                    //             },
+                    //             additionalProperties: true, // Allow other keys in paths
+                    //         },
+                    //         additionalProperties: true, // Allow other properties in ui
+                    //     },
+                    //     additionalProperties: true, // Allow other keys in ui
+                    // },
+                    // targeting: {
+                    //     type: 'array',
+                    //     items: {
+                    //         type: 'object',
+                    //         properties: {
+                    //             export: { type: 'string' },
+                    //             input_query: { type: 'string' },
+                    //             target: { type: 'string' },
+                    //             additionalProperties: true, // Allow other properties in targeting item
+                    //         },
+                    //         required: ['export', 'input_query', 'target'],
+                    //         additionalProperties: true, // Allow other keys in targeting item
+                    //     },
+                    // },
+                    // additionalProperties: true, // Allow other properties in extension
+                },
+                required: ['description', 'handle', 'name', 'type', 'build'],
+                additionalProperties: true, // Allow other keys in extension
+            },
+        },
+        additionalProperties: true, // Allow other top-level properties
+    },
+    required: ['api_version'],
+    // required: ['api_version', 'extensions'],
+    additionalProperties: true, // Allow other top-level keys
+};
+
+const ajv = new Ajv();
+const compiledAjv = ajv.compile(schema);
+
+async function findExtensionTomlFiles(directory) {
+    const files = await fs.readdir(directory);
+    const matchingFiles = [];
+
+    for (const file of files) {
+        if (file === 'node_modules') {
+            continue;
+        }
+
+        const fullPath = path.join(directory, file);
+        const stats = await fs.stat(fullPath);
+
+        if (stats.isFile() && file === 'shopify.extension.toml') {
+            matchingFiles.push(fullPath);
+        } else if (stats.isDirectory()) {
+            // Recursively search subdirectories
+            const subDirectoryFiles = await findExtensionTomlFiles(fullPath);
+            matchingFiles.push(...subDirectoryFiles);
+        }
+    }
+
+    return matchingFiles;
+}
+
+async function testSchema(filename) {
+    await fs.readFile(filename, 'utf8')
+        .then(data => {
+            const parsedData = toml.parse(data);
+            const isValid = compiledAjv(parsedData);
+
+            if (isValid) {
+                console.log(`Validation successful for ${filename}`);
+            } else {
+                console.error(`Validation failed for ${filename}:`);
+                console.error(compiledAjv.errors);
+
+                process.exit(-1)
+            }
+        })
+        .catch(_ => {
+            throw new Error(`Error reading file ${filename}.`);
+        });
+}
+
+async function test() {
+    const filenames = await findExtensionTomlFiles('./');
+
+    filenames.forEach(filename => {
+         testSchema(filename);
+    });
+}
+
+await test();