diff --git a/crates/libsy/src/observability.rs b/crates/libsy/src/observability.rs
index f972bd0c1..102212ea4 100644
--- a/crates/libsy/src/observability.rs
+++ b/crates/libsy/src/observability.rs
@@ -119,6 +119,8 @@ pub(crate) fn run_span(algorithm: &str, request: &Request) -> Span {
         session.id = tracing::field::Empty,
         agent_id = tracing::field::Empty,
         task_id = tracing::field::Empty,
+        task_kind = tracing::field::Empty,
+        agent_role = tracing::field::Empty,
         correlation_id = tracing::field::Empty,
         extra_metadata = tracing::field::Empty,
         outcome = tracing::field::Empty,
@@ -132,6 +134,8 @@ pub(crate) fn run_span(algorithm: &str, request: &Request) -> Span {
             ("session_id", &metadata.session_id),
             ("agent_id", &metadata.agent_id),
             ("task_id", &metadata.task_id),
+            ("task_kind", &metadata.task_kind),
+            ("agent_role", &metadata.agent_role),
             ("correlation_id", &metadata.correlation_id),
         ] {
             if let Some(value) = value {
diff --git a/crates/libsy/tests/observability.rs b/crates/libsy/tests/observability.rs
index 64271716b..127e862e4 100644
--- a/crates/libsy/tests/observability.rs
+++ b/crates/libsy/tests/observability.rs
@@ -433,6 +433,8 @@ fn request_with_metadata(session_id: &str, correlation_id: &str) -> Request {
         metadata: Some(Metadata {
             session_id: Some(session_id.to_string()),
             correlation_id: Some(correlation_id.to_string()),
+            task_kind: Some("code_review".to_string()),
+            agent_role: Some("reviewer".to_string()),
             extra_metadata: Some(BTreeMap::from([(
                 "tenant".to_string(),
                 "obs-tenant-1".to_string(),
@@ -625,6 +627,15 @@ async fn successful_run_records_metrics_spans_and_decision_log() -> switchyard_l
         run_span.fields.get("outcome").map(String::as_str),
         Some("ok")
     );
+    // Semantic harness labels: bounded classes, distinct from the high-cardinality ids above.
+    assert_eq!(
+        run_span.fields.get("task_kind").map(String::as_str),
+        Some("code_review")
+    );
+    assert_eq!(
+        run_span.fields.get("agent_role").map(String::as_str),
+        Some("reviewer")
+    );
     // Host-defined labels ride in generically via Metadata.extra_metadata.
     assert!(
         run_span