diff --git a/base-action/src/parse-sdk-options.ts b/base-action/src/parse-sdk-options.ts
index ec65b8fbb..eab93ecd3 100644
--- a/base-action/src/parse-sdk-options.ts
+++ b/base-action/src/parse-sdk-options.ts
@@ -19,6 +19,7 @@ const ACCUMULATING_FLAGS = new Set([
   "disallowedTools",
   "disallowed-tools",
   "mcp-config",
+  "add-dir",
 ]);
 
 // Delimiter used to join accumulated flag values