That's what I get for hand-editing json

.claude-plugin/plugin.json

@@ -9,5 +9,5 @@
   "homepage": "https://github.com/obra/superpowers",
   "repository": "https://github.com/obra/superpowers",
   "license": "MIT",
-  "keywords": ["skills", "tdd", "debugging", "collaboration", "best-practices", "workflows"],
+  "keywords": ["skills", "tdd", "debugging", "collaboration", "best-practices", "workflows"]
 }