fix(tools): ensure file_path alias passes validation in read/write tools (#7451)

Co-authored-by: lotusfall <lotusfall@outlook.com>

src/agents/pi-tools.read.ts

@@ -194,7 +194,7 @@ export function patchToolSchemaForClaudeCompatibility(tool: AnyAgentTool): AnyAg
     parameters: {
       ...schema,
       properties,
-      ...(required.length > 0 ? { required } : {}),
+      required,
     },
   };
 }