skills: align homepage frontmatter validation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

skills/attractor/SKILL.md

@@ -1,7 +1,8 @@
 ---
 name: attractor
 description: Build, extend, and debug Attractor implementations from the strongdm/attractor specs. Use when work involves DOT pipeline DSL parsing, graph execution traversal, node handlers, checkpoint/resume state, human-in-the-loop gates, condition expressions, model stylesheet rules, or integrating coding-agent-loop/unified-llm backends.
-metadata: { "openclaw": { "emoji": "🧲", "homepage": "https://github.com/strongdm/attractor" } }
+homepage: https://github.com/strongdm/attractor
+metadata: { "openclaw": { "emoji": "🧲" } }
 ---
 
 # Attractor

skills/skill-creator/scripts/quick_validate.py

@@ -95,7 +95,14 @@ def validate_skill(skill_path):
                 "Invalid YAML in frontmatter: unsupported syntax without PyYAML installed",
             )
 
-    allowed_properties = {"name", "description", "license", "allowed-tools", "metadata"}
+    allowed_properties = {
+        "name",
+        "description",
+        "homepage",
+        "license",
+        "allowed-tools",
+        "metadata",
+    }
 
     unexpected_keys = set(frontmatter.keys()) - allowed_properties
     if unexpected_keys:

skills/skill-creator/scripts/test_quick_validate.py

@@ -67,6 +67,22 @@ metadata: |
 
         self.assertTrue(valid, message)
 
+    def test_accepts_homepage_frontmatter_key(self):
+        skill_dir = self.temp_dir / "homepage-skill"
+        skill_dir.mkdir(parents=True, exist_ok=True)
+        content = """---
+name: homepage-skill
+description: Supports homepage
+homepage: https://example.com
+---
+# Skill
+"""
+        (skill_dir / "SKILL.md").write_text(content, encoding="utf-8")
+
+        valid, message = quick_validate.validate_skill(skill_dir)
+
+        self.assertTrue(valid, message)
+
 
 if __name__ == "__main__":
     main()