diff --git a/packages/opencode/src/cli/cmd/run.ts b/packages/opencode/src/cli/cmd/run.ts
index 4272378c..181d8c1e 100644
--- a/packages/opencode/src/cli/cmd/run.ts
+++ b/packages/opencode/src/cli/cmd/run.ts
@@ -64,6 +64,11 @@ export const RunCommand = cmd({
 
     if (!process.stdin.isTTY) message += "\n" + (await Bun.stdin.text())
 
+    if (message.trim().length === 0) {
+      UI.error("Message cannot be empty")
+      return
+    }
+
     await bootstrap({ cwd: process.cwd() }, async () => {
       const session = await (async () => {
         if (args.continue) {