diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..a8fee73
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,66 @@
+#!/usr/bin/env node
+
+/**
+ * SimpleNote CLI - Agent communication CLI for document management
+ */
+
+import { parseArgs } from 'util';
+
+const commands = {
+  doc: 'Document operations',
+  lib: 'Library operations', 
+  tag: 'Tag operations',
+  auth: 'Authentication'
+};
+
+const helpText = `
+SimpleNote CLI - Document management for agents
+
+Usage: simplenote <command> [options]
+
+Commands:
+  doc <subcommand>   Document operations
+  lib <subcommand>   Library operations
+  tag <subcommand>   Tag operations
+  auth <subcommand>  Authentication
+
+Examples:
+  simplenote doc list
+  simplenote doc create --title "My Doc" --content "Content"
+  simplenote lib list
+  simplenote tag list
+
+For more info: simplenote help <command>
+`;
+
+async function main() {
+  const args = process.argv.slice(2);
+  
+  if (args.length === 0 || args[0] === 'help' || args[0] === '--help') {
+    console.log(helpText);
+    return;
+  }
+
+  const [command, ...rest] = args;
+
+  switch (command) {
+    case 'doc':
+      console.log('Document commands - TODO');
+      break;
+    case 'lib':
+      console.log('Library commands - TODO');
+      break;
+    case 'tag':
+      console.log('Tag commands - TODO');
+      break;
+    case 'auth':
+      console.log('Auth commands - TODO');
+      break;
+    default:
+      console.error(`Unknown command: ${command}`);
+      console.log(helpText);
+      process.exit(1);
+  }
+}
+
+main().catch(console.error);