diff --git a/spindle/engines/nixery/engine.go b/spindle/engines/nixery/engine.go
--- a/spindle/engines/nixery/engine.go
+++ b/spindle/engines/nixery/engine.go
@@ -201,6 +201,9 @@
 		Tty:        false,
 		Hostname:   "spindle",
 		WorkingDir: workspaceDir,
+		Labels: map[string]string{
+			"sh.tangled.pipeline/workflow_id": wid.String(),
+		},
 		// TODO(winter): investigate whether environment variables passed here
 		// get propagated to ContainerExec processes
 	}, &container.HostConfig{