diff --git a/.jules/palette.md b/.jules/palette.md
new file mode 100644
index 0000000..8c57b0d
--- /dev/null
+++ b/.jules/palette.md
@@ -0,0 +1,3 @@
+## 2026-05-01 - Add context to interactive widgets lacking descriptive labels
+**Learning:** Generic visual labels like `[hide]` or `[show]` on interactive widgets lack context for screen reader users when they navigate out of the visual flow. Relying purely on visual layout for context is a common accessibility trap.
+**Action:** Always provide a contextual `aria-label` (e.g., `"Hide [Section Title]"`) when the visual text of a button is ambiguous or repetitive. Additionally, use `useId` to reliably map `aria-controls` to the content `id` avoiding collisions.
diff --git a/src/components/wiki/wiki-collapsible.tsx b/src/components/wiki/wiki-collapsible.tsx
index 5284dd8..f507721 100644
--- a/src/components/wiki/wiki-collapsible.tsx
+++ b/src/components/wiki/wiki-collapsible.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useState, useId } from "react";
 
 interface WikiCollapsibleProps {
   title: string;
@@ -14,6 +14,7 @@ export function WikiCollapsible({
   defaultOpen = true,
 }: WikiCollapsibleProps) {
   const [isOpen, setIsOpen] = useState(defaultOpen);
+  const contentId = useId();
 
   return (
     <div className="border border-wiki-border-light bg-wiki-offwhite">
@@ -22,11 +23,14 @@ export function WikiCollapsible({
         <button
           onClick={() => setIsOpen(!isOpen)}
           className="text-wiki-link text-sm hover:underline"
+          aria-expanded={isOpen}
+          aria-controls={contentId}
+          aria-label={`${isOpen ? "Hide" : "Show"} ${title}`}
         >
           [{isOpen ? "hide" : "show"}]
         </button>
       </div>
-      {isOpen && <div className="px-4 py-3">{children}</div>}
+      {isOpen && <div id={contentId} className="px-4 py-3">{children}</div>}
     </div>
   );
 }