diff --git a/crates/mcp/tests/automation_roots.rs b/crates/mcp/tests/automation_roots.rs
--- a/crates/mcp/tests/automation_roots.rs
+++ b/crates/mcp/tests/automation_roots.rs
@@ -210,6 +210,7 @@ fn links_out_of_a_root_are_refused() {
 }
 
 /// The names in `dir`, sorted.
+#[cfg(unix)]
 fn names(dir: &Path) -> Vec<String> {
     let mut names: Vec<String> = std::fs::read_dir(dir).unwrap().map(|e| e.unwrap().file_name().to_string_lossy().into_owned()).collect();
     names.sort();