diff --git a/codex-rs/core-skills/src/service.rs b/codex-rs/core-skills/src/service.rs
index 1c956d79b..b4e0d7396 100644
--- a/codex-rs/core-skills/src/service.rs
+++ b/codex-rs/core-skills/src/service.rs
@@ -327,8 +327,16 @@ fn finalize_skill_outcome(
     disabled_paths: HashSet<AbsolutePathBuf>,
 ) -> SkillLoadOutcome {
     outcome.disabled_paths = disabled_paths;
-    let (by_scripts_dir, by_doc_path) =
-        build_implicit_skill_path_indexes(outcome.allowed_skills_for_implicit_invocation());
+    // Usage-event detection should see any enabled skill file/script read, even when the
+    // skill is not model-routable through implicit invocation.
+    let (by_scripts_dir, by_doc_path) = build_implicit_skill_path_indexes(
+        outcome
+            .skills
+            .iter()
+            .filter(|skill| outcome.is_skill_enabled(skill))
+            .cloned()
+            .collect(),
+    );
     outcome.implicit_skills_by_scripts_dir = Arc::new(by_scripts_dir);
     outcome.implicit_skills_by_doc_path = Arc::new(by_doc_path);
     outcome