diff --git a/tools/cli/src/validate.ts b/tools/cli/src/validate.ts
new file mode 100644
index 00000000..a74e1ef2
--- /dev/null
+++ b/tools/cli/src/validate.ts
@@ -0,0 +1,68 @@
+import fs from 'fs-extra';
+import Ajv from 'ajv/dist/2020';
+import chalk from 'chalk';
+import path from 'path';
+
+
+const SCHEMA_BASE_URL = "https://raw.githubusercontent.com/google/A2UI/main/specification/0.9/json";
+
+async function loadSchema(name: string): Promise<any> {
+   
+    try {
+        const response = await fetch(`${SCHEMA_BASE_URL}/${name}`);
+        if (!response.ok) throw new Error(`Failed to fetch ${name}`);
+        return await response.json();
+    } catch (e) {
+        console.error(chalk.red(`Could not load schema ${name}:`), e);
+        process.exit(1);
+    }
+}
+
+export async function validateFile(filePath: string, version: string): Promise<boolean> {
+ 
+  let content;
+  try {
+    content = await fs.readJson(filePath);
+  } catch (error) {
+    console.error(chalk.red(`Error reading file: ${(error as Error).message}`));
+    return false;
+  }
+
+  
+  const serverSchema = await loadSchema('server_to_client.json');
+  const commonTypes = await loadSchema('common_types.json');
+  const standardCatalog = await loadSchema('standard_catalog_definition.json');
+
+
+  const ajv = new Ajv({ allErrors: true, strict: false });
+  ajv.addSchema(commonTypes);
+  ajv.addSchema(standardCatalog);
+  
+  ajv.addSchema(serverSchema, 'server_to_client');
+
+  const validateFn = ajv.getSchema('server_to_client');
+
+  if (!validateFn) {
+      console.error(chalk.red("Failed to initialize validator function"));
+      return false;
+  }
+
+  const messages = Array.isArray(content) ? content : [content];
+  let hasErrors = false;
+
+  messages.forEach((msg, index) => {
+    const valid = validateFn(msg);
+    
+    if (valid) {
+      console.log(chalk.green(`✓ Message ${index} is valid.`));
+    } else {
+      hasErrors = true;
+      console.error(chalk.red(`✗ Message ${index} Invalid:`));
+      validateFn.errors?.forEach(err => {
+        console.error(chalk.yellow(`  - ${err.instancePath} ${err.message}`));
+      });
+    }
+  });
+
+  return !hasErrors;
+}