diff --git a/src/agents/pi-tools.read.ts b/src/agents/pi-tools.read.ts
index d218add33..c30333c4f 100644
--- a/src/agents/pi-tools.read.ts
+++ b/src/agents/pi-tools.read.ts
@@ -194,7 +194,7 @@ export function patchToolSchemaForClaudeCompatibility(tool: AnyAgentTool): AnyAg
     parameters: {
       ...schema,
       properties,
-      ...(required.length > 0 ? { required } : {}),
+      required,
     },
   };
 }