fix: replace colons in command filenames for Windows compatibility

scripts/sync_extensions.py

@@ -143,7 +143,8 @@ def collect_needed_commands() -> list[CommandSpec]:
             meta = parse_frontmatter(skill_md.read_text())
             desc = str(meta.get("description", ""))
             for trigger in slash_triggers(meta):
-                cmd_name = trigger.lstrip("/")
+                # Replace colons with dashes for cross-platform filename compatibility
+                cmd_name = trigger.lstrip("/").replace(":", "-")
                 cmd_path = skill_dir / "commands" / f"{cmd_name}.md"
                 needed.append(CommandSpec(path=cmd_path, trigger=trigger, description=desc))
     return needed

tests/test_sync_extensions.py

@@ -198,6 +198,20 @@ def test_paths_are_under_commands_dir(self):
             assert spec.path.parent.name == "commands"
             assert spec.path.suffix == ".md"
 
+    def test_colon_triggers_are_normalized_for_filenames(self, tmp_path, monkeypatch):
+        skill_dir = tmp_path / "skills" / "test-skill"
+        skill_dir.mkdir(parents=True)
+        (skill_dir / "SKILL.md").write_text(
+            "---\nname: test-skill\ndescription: Test\ntriggers:\n  - /test:command\n---\nBody\n"
+        )
+
+        monkeypatch.setattr("sync_extensions.SKILL_DIRS", [tmp_path / "skills"])
+
+        specs = collect_needed_commands()
+        assert [spec.path.relative_to(tmp_path).as_posix() for spec in specs] == [
+            "skills/test-skill/commands/test-command.md"
+        ]
+
 
 # ── load_marketplaces ────────────────────────────────────────────────