diff --git a/packages/cli/package.json b/packages/cli/package.json
index 0442c1ebc..69da665c9 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.29.3",
+  "version": "0.29.4",
   "type": "module",
   "bin": {
     "spawn": "cli.js"
diff --git a/packages/cli/src/flags.ts b/packages/cli/src/flags.ts
index 470f86cf8..94db1118b 100644
--- a/packages/cli/src/flags.ts
+++ b/packages/cli/src/flags.ts
@@ -40,6 +40,7 @@ export const KNOWN_FLAGS = new Set([
   "-u",
   "--yes",
   "-y",
+  "--flat",
 ]);
 
 /** Return the first unknown flag in args, or null if all are known/positional */