runtime: namespace spawned worker names

crates/worker-runtime/src/worker_backend.rs

@@ -137,7 +137,11 @@ impl ProfileRuntimeWorkerFactory {
     }
 
     fn runtime_worker_name(request: &WorkerExecutionSpawnRequest) -> String {
-        request.worker_ref.worker_id.to_string()
+        format!(
+            "runtime-{}-{}",
+            sanitize_worker_name_component(request.worker_ref.runtime_id.as_str()),
+            request.worker_ref.worker_id
+        )
     }
 
     fn runtime_profile_value(
@@ -213,6 +217,19 @@ impl ProfileRuntimeWorkerFactory {
     }
 }
 
+fn sanitize_worker_name_component(value: &str) -> String {
+    value
+        .chars()
+        .map(|ch| {
+            if ch.is_ascii_alphanumeric() || matches!(ch, '-' | '_') {
+                ch
+            } else {
+                '-'
+            }
+        })
+        .collect()
+}
+
 #[cfg(feature = "http-server")]
 async fn fetch_profile_source_archive_http(
     location: &ProfileSourceArchiveHttpRef,
@@ -800,6 +817,7 @@ mod tests {
         ConfigBundleRef, CreateWorkerRequest, DirtyStatePolicy, MaterializerKind, ProfileSelector,
         RepositorySelector, WorkingDirectoryRepository, WorkingDirectoryRequest,
     };
+    use crate::execution::WorkerExecutionContext;
     use crate::identity::RuntimeId;
     use crate::management::RuntimeOptions;
     use crate::observation::{TranscriptQuery, TranscriptRole};
@@ -1021,6 +1039,31 @@ mod tests {
         }
     }
 
+    #[test]
+    fn runtime_worker_name_is_namespaced_by_runtime_id() {
+        let runtime_id = RuntimeId::new("arc:remote".to_string()).unwrap();
+        let worker_ref = crate::identity::WorkerRef::new(
+            runtime_id,
+            crate::identity::WorkerId::new("worker-00000001".to_string()).unwrap(),
+        );
+        let request = WorkerExecutionSpawnRequest {
+            worker_ref: worker_ref.clone(),
+            request: create_request("worker-00000001"),
+            context: WorkerExecutionContext::new(worker_ref, Arc::new(|_, _| panic!("unused"))),
+            working_directory: None,
+            config_bundle: None,
+        };
+
+        assert_eq!(
+            ProfileRuntimeWorkerFactory::runtime_worker_name(&request),
+            "runtime-arc-remote-worker-00000001"
+        );
+        assert_ne!(
+            ProfileRuntimeWorkerFactory::runtime_worker_name(&request),
+            "worker-00000001"
+        );
+    }
+
     #[tokio::test]
     async fn embedded_profile_source_archive_does_not_require_backend_resource_fetch() {
         let factory = ProfileRuntimeWorkerFactory::new(tempfile::tempdir().unwrap().path());

crates/workspace-server/src/hosts.rs

@@ -3348,10 +3348,7 @@ mod tests {
                 .resolve_profile(&selector_key, root.path(), "embedded-test-worker")
                 .unwrap();
             assert_eq!(manifest.worker.name, "embedded-test-worker");
-            assert_eq!(
-                manifest.model.ref_.as_deref(),
-                Some("codex-oauth/gpt-5.5")
-            );
+            assert_eq!(manifest.model.ref_.as_deref(), Some("codex-oauth/gpt-5.5"));
         }
     }