Remove lower casing -- preserving prior behavior

src/agents/skills-clawhub.test.ts

@@ -151,6 +151,18 @@ describe("skills-clawhub", () => {
       });
     });
 
+    it("rejects Unicode that case-folds to ASCII (Kelvin sign U+212A)", async () => {
+      // "\u212A" (Kelvin sign) lowercases to "k" — must be caught before lowercasing
+      const result = await installSkillFromClawHub({
+        workspaceDir: "/tmp/workspace",
+        slug: "\u212Aalendar",
+      });
+      expect(result).toMatchObject({
+        ok: false,
+        error: expect.stringContaining("Invalid skill slug"),
+      });
+    });
+
     it("rejects slug starting with a hyphen", async () => {
       const result = await installSkillFromClawHub({
         workspaceDir: "/tmp/workspace",
@@ -173,7 +185,15 @@ describe("skills-clawhub", () => {
       });
     });
 
-    it("accepts valid ASCII slugs", async () => {
+    it("accepts uppercase ASCII slugs (preserves original casing behavior)", async () => {
+      const result = await installSkillFromClawHub({
+        workspaceDir: "/tmp/workspace",
+        slug: "React",
+      });
+      expect(result).toMatchObject({ ok: true });
+    });
+
+    it("accepts valid lowercase ASCII slugs", async () => {
       const result = await installSkillFromClawHub({
         workspaceDir: "/tmp/workspace",
         slug: "calendar-2",

src/agents/skills-clawhub.ts

@@ -62,10 +62,15 @@ type Logger = {
   info?: (message: string) => void;
 };
 
-const VALID_SLUG_PATTERN = /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/;
+const VALID_SLUG_PATTERN = /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i;
+// eslint-disable-next-line no-control-regex -- detects any character outside printable ASCII
+const NON_ASCII_PATTERN = /[^\x00-\x7F]/;
 
 function normalizeSlug(raw: string): string {
-  const slug = raw.trim().toLowerCase();
+  const slug = raw.trim();
+  if (NON_ASCII_PATTERN.test(slug)) {
+    throw new Error(`Invalid skill slug: ${raw}`);
+  }
   if (!slug || !VALID_SLUG_PATTERN.test(slug)) {
     throw new Error(`Invalid skill slug: ${raw}`);
   }