diff --git a/sdks/typescript/boot.go b/sdks/typescript/boot.go
index 7bace0b1b716..60a39b770d00 100644
--- a/sdks/typescript/boot.go
+++ b/sdks/typescript/boot.go
@@ -169,5 +169,14 @@ func main() {
 		args = append(args, "--status_endpoint="+info.GetStatusEndpoint().GetUrl())
 	}
 
-	log.Fatalf("User program exited: %v", execx.Execute("npx", args...))
+  workerIds := append([]string{*workerId}, info.GetSiblingWorkerIds()...)
+	var wg sync.WaitGroup
+	wg.Add(len(workerIds))
+	for _, workerId := range workerIds {
+		go func(workerId string) {
+			log.Printf("Executing: python %v", strings.Join(args, " "))
+			log.Fatalf("User program exited: %v", execx.ExecuteEnv(map[string]string{"WORKER_ID": workerId}, "npx", args...))
+		}(workerId)
+	}
+	wg.Wait()
 }
diff --git a/sdks/typescript/src/apache_beam/internal/environments.ts b/sdks/typescript/src/apache_beam/internal/environments.ts
index 4ffc45553972..4e45800839ea 100644
--- a/sdks/typescript/src/apache_beam/internal/environments.ts
+++ b/sdks/typescript/src/apache_beam/internal/environments.ts
@@ -21,8 +21,12 @@ import * as runnerApi from "../proto/beam_runner_api";
 export const TYPESCRIPT_DEFAULT_ENVIRONMENT_URN = "js_default";
 
 function javascriptCapabilities(): string[] {
-  // XXX This is needed for sessions to work...
-  return ["beam:coder:interval_window:v1"]; // TODO: Cleanup. Actually populate.
+  // TODO: Cleanup. Actually populate.
+  return [
+    // This is needed for sessions to work...
+    "beam:coder:interval_window:v1",
+    "beam:protocol:sibling_workers:v1",
+  ];
 }
 
 export function defaultJsEnvironment() {
diff --git a/sdks/typescript/src/apache_beam/runners/dataflow.ts b/sdks/typescript/src/apache_beam/runners/dataflow.ts
index 1bdd250cb1e6..950e630d82d9 100644
--- a/sdks/typescript/src/apache_beam/runners/dataflow.ts
+++ b/sdks/typescript/src/apache_beam/runners/dataflow.ts
@@ -32,13 +32,15 @@ export function dataflowRunner(runnerOptions: {
       pipeline: Pipeline,
       options: Object = {}
     ): Promise<PipelineResult> {
+      var augmentedOptions = { experiments: [] as string[], ...options };
+      augmentedOptions.experiments.push("use_sibling_sdk_workers");
       return new PortableRunner(
         runnerOptions as any,
         PythonService.forModule(
           "apache_beam.runners.dataflow.dataflow_job_service",
           ["--port", "{{PORT}}"]
         )
-      ).runPipeline(pipeline, options);
+      ).runPipeline(pipeline, augmentedOptions);
     }
   })();
 }