#399

frontend/AGENTS.md

@@ -173,6 +173,10 @@ pass or the remaining failure is clearly blocked.
   `?` / `:` pairing.
 - Keep short inline props types local when they remain readable and within the
   line limit; do not mechanically extract a named type with no reuse benefit.
+- In JavaScript, JSX, TypeScript, and TSX, never use `_1`, `_2`, or similar
+  Ruby-style numbered parameter names. Reserve numbered parameters for Ruby.
+  Use a meaningful callback parameter name such as `row`, `item`, `value`,
+  `entry`, or `result`.
 - In multi-line object literals, keep the opening `{` with the first pair when
   the line length allows it; do not mechanically explode short objects into
   Prettier-style vertical blocks.
@@ -258,7 +262,7 @@ finally
 ```ts
 const editingRow =
     Number.isFinite (editingSourceRow)
-    ? rows.find (_1 => _1.sourceRow === editingSourceRow) ?? null
+    ? rows.find (row => row.sourceRow === editingSourceRow) ?? null
     : null
 ```