Include workflow_id in all execution WebSocket messages

The frontend already stores extra_data['extra_pnginfo']['workflow']['id']
when queueing a prompt and exposes it via the /api/jobs REST endpoint, but
none of the WebSocket events emitted during execution carry it. That makes
it impossible to scope progress state by workflow on the client without
maintaining a job_id -> workflow_id mapping that races with execution_start.

This adds workflow_id alongside prompt_id on every execution event:

- execution_start, execution_success, execution_error, execution_interrupted,
  execution_cached, executing, executed
- progress and progress_state
- the metadata block on PREVIEW_IMAGE_WITH_METADATA

A new public extract_workflow_id helper in comfy_execution/jobs.py is the
single source of truth for the lookup; the existing _extract_job_metadata
delegates to it. The id is plumbed through PromptExecutor (stored as
self.workflow_id and on server.last_workflow_id), the module-level
execute() coroutine, the _send_cached_ui helper, and ProgressRegistry /
reset_progress_state so WebUIProgressHandler can include it in
progress_state and preview-image metadata. The progress hook in main.py
reads server.last_workflow_id to populate the legacy 'progress' event.

Tests cover the helper's edge cases (missing/non-string ids, non-dict
levels) and that the WebUIProgressHandler emits workflow_id on every
progress_state payload via mocked PromptServer.

comfy_execution/jobs.py

@@ -93,6 +93,27 @@ def _create_text_preview(value: str) -> dict:
     }
 
 
+def extract_workflow_id(extra_data: Optional[dict]) -> Optional[str]:
+    """Extract the workflow id from a prompt's ``extra_data``.
+
+    The frontend stores the id at ``extra_data["extra_pnginfo"]["workflow"]["id"]``
+    when a prompt is queued. Any value that is not a non-empty string is treated as
+    missing so callers can rely on the return being either ``None`` or a string.
+    """
+    if not isinstance(extra_data, dict):
+        return None
+    extra_pnginfo = extra_data.get('extra_pnginfo')
+    if not isinstance(extra_pnginfo, dict):
+        return None
+    workflow = extra_pnginfo.get('workflow')
+    if not isinstance(workflow, dict):
+        return None
+    workflow_id = workflow.get('id')
+    if isinstance(workflow_id, str) and workflow_id:
+        return workflow_id
+    return None
+
+
 def _extract_job_metadata(extra_data: dict) -> tuple[Optional[int], Optional[str]]:
     """Extract create_time and workflow_id from extra_data.
 
@@ -100,8 +121,7 @@ def _extract_job_metadata(extra_data: dict) -> tuple[Optional[int], Optional[str
         tuple: (create_time, workflow_id)
     """
     create_time = extra_data.get('create_time')
-    extra_pnginfo = extra_data.get('extra_pnginfo', {})
+    workflow_id = extract_workflow_id(extra_data)
-    workflow_id = extra_pnginfo.get('workflow', {}).get('id')
     return create_time, workflow_id
 
 

comfy_execution/progress.py

@@ -164,6 +164,8 @@ class WebUIProgressHandler(ProgressHandler):
         if self.server_instance is None:
             return
 
+        workflow_id = self.registry.workflow_id if self.registry else None
+
         # Only send info for non-pending nodes
         active_nodes = {
             node_id: {
@@ -172,6 +174,7 @@ class WebUIProgressHandler(ProgressHandler):
                 "state": state["state"].value,
                 "node_id": node_id,
                 "prompt_id": prompt_id,
+                "workflow_id": workflow_id,
                 "display_node_id": self.registry.dynprompt.get_display_node_id(node_id),
                 "parent_node_id": self.registry.dynprompt.get_parent_node_id(node_id),
                 "real_node_id": self.registry.dynprompt.get_real_node_id(node_id),
@@ -183,7 +186,7 @@ class WebUIProgressHandler(ProgressHandler):
         # Send a combined progress_state message with all node states
         # Include client_id to ensure message is only sent to the initiating client
         self.server_instance.send_sync(
-            "progress_state", {"prompt_id": prompt_id, "nodes": active_nodes}, self.server_instance.client_id
+            "progress_state", {"prompt_id": prompt_id, "workflow_id": workflow_id, "nodes": active_nodes}, self.server_instance.client_id
         )
 
     @override
@@ -215,6 +218,7 @@ class WebUIProgressHandler(ProgressHandler):
                 metadata = {
                     "node_id": node_id,
                     "prompt_id": prompt_id,
+                    "workflow_id": self.registry.workflow_id if self.registry else None,
                     "display_node_id": self.registry.dynprompt.get_display_node_id(
                         node_id
                     ),
@@ -240,9 +244,10 @@ class ProgressRegistry:
     Registry that maintains node progress state and notifies registered handlers.
     """
 
-    def __init__(self, prompt_id: str, dynprompt: "DynamicPrompt"):
+    def __init__(self, prompt_id: str, dynprompt: "DynamicPrompt", workflow_id: Optional[str] = None):
         self.prompt_id = prompt_id
         self.dynprompt = dynprompt
+        self.workflow_id = workflow_id
         self.nodes: Dict[str, NodeProgressState] = {}
         self.handlers: Dict[str, ProgressHandler] = {}
 
@@ -322,7 +327,7 @@ class ProgressRegistry:
 # Global registry instance
 global_progress_registry: ProgressRegistry | None = None
 
-def reset_progress_state(prompt_id: str, dynprompt: "DynamicPrompt") -> None:
+def reset_progress_state(prompt_id: str, dynprompt: "DynamicPrompt", workflow_id: Optional[str] = None) -> None:
     global global_progress_registry
 
     # Reset existing handlers if registry exists
@@ -330,7 +335,7 @@ def reset_progress_state(prompt_id: str, dynprompt: "DynamicPrompt") -> None:
         global_progress_registry.reset_handlers()
 
     # Create new registry
-    global_progress_registry = ProgressRegistry(prompt_id, dynprompt)
+    global_progress_registry = ProgressRegistry(prompt_id, dynprompt, workflow_id)
 
 
 def add_progress_handler(handler: ProgressHandler) -> None:

execution.py

@@ -37,6 +37,7 @@ from comfy_execution.graph import (
 from comfy_execution.graph_utils import GraphBuilder, is_link
 from comfy_execution.validation import validate_node_input
 from comfy_execution.progress import get_progress_state, reset_progress_state, add_progress_handler, WebUIProgressHandler
+from comfy_execution.jobs import extract_workflow_id
 from comfy_execution.utils import CurrentNodeContext
 from comfy_api.internal import _ComfyNodeInternal, _NodeOutputInternal, first_real_override, is_class, make_locked_method_func
 from comfy_api.latest import io, _io
@@ -416,15 +417,15 @@ def _is_intermediate_output(dynprompt, node_id):
     class_def = nodes.NODE_CLASS_MAPPINGS[class_type]
     return getattr(class_def, 'HAS_INTERMEDIATE_OUTPUT', False)
 
-def _send_cached_ui(server, node_id, display_node_id, cached, prompt_id, ui_outputs):
+def _send_cached_ui(server, node_id, display_node_id, cached, prompt_id, workflow_id, ui_outputs):
     if server.client_id is None:
         return
     cached_ui = cached.ui or {}
-    server.send_sync("executed", { "node": node_id, "display_node": display_node_id, "output": cached_ui.get("output", None), "prompt_id": prompt_id }, server.client_id)
+    server.send_sync("executed", { "node": node_id, "display_node": display_node_id, "output": cached_ui.get("output", None), "prompt_id": prompt_id, "workflow_id": workflow_id }, server.client_id)
     if cached.ui is not None:
         ui_outputs[node_id] = cached.ui
 
-async def execute(server, dynprompt, caches, current_item, extra_data, executed, prompt_id, execution_list, pending_subgraph_results, pending_async_nodes, ui_outputs):
+async def execute(server, dynprompt, caches, current_item, extra_data, executed, prompt_id, workflow_id, execution_list, pending_subgraph_results, pending_async_nodes, ui_outputs):
     unique_id = current_item
     real_node_id = dynprompt.get_real_node_id(unique_id)
     display_node_id = dynprompt.get_display_node_id(unique_id)
@@ -434,7 +435,7 @@ async def execute(server, dynprompt, caches, current_item, extra_data, executed,
     class_def = nodes.NODE_CLASS_MAPPINGS[class_type]
     cached = await caches.outputs.get(unique_id)
     if cached is not None:
-        _send_cached_ui(server, unique_id, display_node_id, cached, prompt_id, ui_outputs)
+        _send_cached_ui(server, unique_id, display_node_id, cached, prompt_id, workflow_id, ui_outputs)
         get_progress_state().finish_progress(unique_id)
         execution_list.cache_update(unique_id, cached)
         return (ExecutionResult.SUCCESS, None, None)
@@ -482,7 +483,7 @@ async def execute(server, dynprompt, caches, current_item, extra_data, executed,
             input_data_all, missing_keys, v3_data = get_input_data(inputs, class_def, unique_id, execution_list, dynprompt, extra_data)
             if server.client_id is not None:
                 server.last_node_id = display_node_id
-                server.send_sync("executing", { "node": unique_id, "display_node": display_node_id, "prompt_id": prompt_id }, server.client_id)
+                server.send_sync("executing", { "node": unique_id, "display_node": display_node_id, "prompt_id": prompt_id, "workflow_id": workflow_id }, server.client_id)
 
             obj = await caches.objects.get(unique_id)
             if obj is None:
@@ -512,6 +513,7 @@ async def execute(server, dynprompt, caches, current_item, extra_data, executed,
                 if block.message is not None:
                     mes = {
                         "prompt_id": prompt_id,
+                        "workflow_id": workflow_id,
                         "node_id": unique_id,
                         "node_type": class_type,
                         "executed": list(executed),
@@ -559,7 +561,7 @@ async def execute(server, dynprompt, caches, current_item, extra_data, executed,
                 "output": output_ui
             }
             if server.client_id is not None:
-                server.send_sync("executed", { "node": unique_id, "display_node": display_node_id, "output": output_ui, "prompt_id": prompt_id }, server.client_id)
+                server.send_sync("executed", { "node": unique_id, "display_node": display_node_id, "output": output_ui, "prompt_id": prompt_id, "workflow_id": workflow_id }, server.client_id)
         if has_subgraph:
             cached_outputs = []
             new_node_ids = []
@@ -656,6 +658,7 @@ class PromptExecutor:
         self.caches = CacheSet(cache_type=self.cache_type, cache_args=self.cache_args)
         self.status_messages = []
         self.success = True
+        self.workflow_id = None
 
     def add_message(self, event, data: dict, broadcast: bool):
         data = {
@@ -675,6 +678,7 @@ class PromptExecutor:
         if isinstance(ex, comfy.model_management.InterruptProcessingException):
             mes = {
                 "prompt_id": prompt_id,
+                "workflow_id": self.workflow_id,
                 "node_id": node_id,
                 "node_type": class_type,
                 "executed": list(executed),
@@ -683,6 +687,7 @@ class PromptExecutor:
         else:
             mes = {
                 "prompt_id": prompt_id,
+                "workflow_id": self.workflow_id,
                 "node_id": node_id,
                 "node_type": class_type,
                 "executed": list(executed),
@@ -721,7 +726,9 @@ class PromptExecutor:
             self.server.client_id = None
 
         self.status_messages = []
-        self.add_message("execution_start", { "prompt_id": prompt_id}, broadcast=False)
+        self.workflow_id = extract_workflow_id(extra_data)
+        self.server.last_workflow_id = self.workflow_id
+        self.add_message("execution_start", { "prompt_id": prompt_id, "workflow_id": self.workflow_id }, broadcast=False)
 
         self._notify_prompt_lifecycle("start", prompt_id)
         ram_headroom = int(self.cache_args["ram"] * (1024 ** 3))
@@ -731,7 +738,7 @@ class PromptExecutor:
         try:
             with torch.inference_mode():
                 dynamic_prompt = DynamicPrompt(prompt)
-                reset_progress_state(prompt_id, dynamic_prompt)
+                reset_progress_state(prompt_id, dynamic_prompt, self.workflow_id)
                 add_progress_handler(WebUIProgressHandler(self.server))
                 is_changed_cache = IsChangedCache(prompt_id, dynamic_prompt, self.caches.outputs)
                 for cache in self.caches.all:
@@ -749,7 +756,7 @@ class PromptExecutor:
 
                 comfy.model_management.cleanup_models_gc()
                 self.add_message("execution_cached",
-                              { "nodes": cached_nodes, "prompt_id": prompt_id},
+                              { "nodes": cached_nodes, "prompt_id": prompt_id, "workflow_id": self.workflow_id },
                               broadcast=False)
                 pending_subgraph_results = {}
                 pending_async_nodes = {} # TODO - Unify this with pending_subgraph_results
@@ -767,7 +774,7 @@ class PromptExecutor:
                         break
 
                     assert node_id is not None, "Node ID should not be None at this point"
-                    result, error, ex = await execute(self.server, dynamic_prompt, self.caches, node_id, extra_data, executed, prompt_id, execution_list, pending_subgraph_results, pending_async_nodes, ui_node_outputs)
+                    result, error, ex = await execute(self.server, dynamic_prompt, self.caches, node_id, extra_data, executed, prompt_id, self.workflow_id, execution_list, pending_subgraph_results, pending_async_nodes, ui_node_outputs)
                     self.success = result != ExecutionResult.FAILURE
                     if result == ExecutionResult.FAILURE:
                         self.handle_execution_error(prompt_id, dynamic_prompt.original_prompt, current_outputs, executed, error, ex)
@@ -791,8 +798,8 @@ class PromptExecutor:
                         cached = await self.caches.outputs.get(node_id)
                         if cached is not None:
                             display_node_id = dynamic_prompt.get_display_node_id(node_id)
-                            _send_cached_ui(self.server, node_id, display_node_id, cached, prompt_id, ui_node_outputs)
+                            _send_cached_ui(self.server, node_id, display_node_id, cached, prompt_id, self.workflow_id, ui_node_outputs)
-                    self.add_message("execution_success", { "prompt_id": prompt_id }, broadcast=False)
+                    self.add_message("execution_success", { "prompt_id": prompt_id, "workflow_id": self.workflow_id }, broadcast=False)
 
                 ui_outputs = {}
                 meta_outputs = {}

main.py

@@ -322,7 +322,7 @@ def prompt_worker(q, server_instance):
                             completed=e.success,
                             messages=e.status_messages), process_item=remove_sensitive)
             if server_instance.client_id is not None:
-                server_instance.send_sync("executing", {"node": None, "prompt_id": prompt_id}, server_instance.client_id)
+                server_instance.send_sync("executing", {"node": None, "prompt_id": prompt_id, "workflow_id": getattr(server_instance, 'last_workflow_id', None)}, server_instance.client_id)
 
             current_time = time.perf_counter()
             execution_time = current_time - execution_start_time
@@ -385,7 +385,7 @@ def hijack_progress(server_instance):
             prompt_id = server_instance.last_prompt_id
         if node_id is None:
             node_id = server_instance.last_node_id
-        progress = {"value": value, "max": total, "prompt_id": prompt_id, "node": node_id}
+        progress = {"value": value, "max": total, "prompt_id": prompt_id, "workflow_id": getattr(server_instance, 'last_workflow_id', None), "node": node_id}
         get_progress_state().update_progress(node_id, value, total, preview_image)
 
         server_instance.send_sync("progress", progress, server_instance.client_id)

tests-unit/execution_test/test_workflow_id_in_ws_messages.py

@@ -0,0 +1,111 @@
+"""Tests that workflow_id is included alongside prompt_id in WebSocket payloads
+emitted by the progress handler and the prompt executor.
+
+Frontend stores extra_data["extra_pnginfo"]["workflow"]["id"] when queueing a
+prompt; we propagate that as `workflow_id` on every execution event so a
+multi-tab UI can scope progress state by workflow even when terminal
+WebSocket frames are dropped.
+"""
+
+from unittest.mock import MagicMock
+
+import pytest
+
+from comfy_execution.progress import (
+    NodeState,
+    ProgressRegistry,
+    WebUIProgressHandler,
+    reset_progress_state,
+    get_progress_state,
+)
+
+
+class _DummyDynPrompt:
+    def get_display_node_id(self, node_id):
+        return node_id
+
+    def get_parent_node_id(self, node_id):
+        return None
+
+    def get_real_node_id(self, node_id):
+        return node_id
+
+
+@pytest.fixture
+def server():
+    s = MagicMock()
+    s.client_id = "client-1"
+    return s
+
+
+def _registry(workflow_id):
+    return ProgressRegistry(
+        prompt_id="prompt-1",
+        dynprompt=_DummyDynPrompt(),
+        workflow_id=workflow_id,
+    )
+
+
+class TestProgressStatePayload:
+    def test_progress_state_includes_workflow_id(self, server):
+        registry = _registry("wf-abc")
+        registry.nodes["n1"] = {
+            "state": NodeState.Running,
+            "value": 1.0,
+            "max": 5.0,
+        }
+
+        handler = WebUIProgressHandler(server)
+        handler.set_registry(registry)
+        handler._send_progress_state("prompt-1", registry.nodes)
+
+        server.send_sync.assert_called_once()
+        event, payload, sid = server.send_sync.call_args.args
+        assert event == "progress_state"
+        assert payload["prompt_id"] == "prompt-1"
+        assert payload["workflow_id"] == "wf-abc"
+        assert payload["nodes"]["n1"]["workflow_id"] == "wf-abc"
+        assert payload["nodes"]["n1"]["prompt_id"] == "prompt-1"
+        assert sid == "client-1"
+
+    def test_progress_state_workflow_id_none_when_missing(self, server):
+        registry = _registry(None)
+        registry.nodes["n1"] = {
+            "state": NodeState.Running,
+            "value": 0.5,
+            "max": 1.0,
+        }
+
+        handler = WebUIProgressHandler(server)
+        handler.set_registry(registry)
+        handler._send_progress_state("prompt-1", registry.nodes)
+
+        _, payload, _ = server.send_sync.call_args.args
+        assert payload["workflow_id"] is None
+        assert payload["nodes"]["n1"]["workflow_id"] is None
+
+
+class TestProgressRegistryConstruction:
+    def test_workflow_id_default_is_none(self):
+        registry = ProgressRegistry(
+            prompt_id="prompt-1", dynprompt=_DummyDynPrompt()
+        )
+        assert registry.workflow_id is None
+
+    def test_workflow_id_stored_on_registry(self):
+        registry = ProgressRegistry(
+            prompt_id="prompt-1",
+            dynprompt=_DummyDynPrompt(),
+            workflow_id="wf-xyz",
+        )
+        assert registry.workflow_id == "wf-xyz"
+
+
+class TestResetProgressState:
+    def test_reset_threads_workflow_id(self):
+        reset_progress_state("prompt-1", _DummyDynPrompt(), "wf-456")
+        assert get_progress_state().workflow_id == "wf-456"
+
+    def test_reset_default_workflow_id_none(self):
+        reset_progress_state("prompt-2", _DummyDynPrompt())
+        assert get_progress_state().workflow_id is None

tests/execution/test_jobs.py

@@ -10,9 +10,44 @@ from comfy_execution.jobs import (
     get_outputs_summary,
     apply_sorting,
     has_3d_extension,
+    extract_workflow_id,
 )
 
 
+class TestExtractWorkflowId:
+    """Unit tests for extract_workflow_id()."""
+
+    def test_returns_id_from_extra_pnginfo(self):
+        assert extract_workflow_id({'extra_pnginfo': {'workflow': {'id': 'wf-123'}}}) == 'wf-123'
+
+    def test_missing_extra_data_returns_none(self):
+        assert extract_workflow_id(None) is None
+
+    def test_non_dict_extra_data_returns_none(self):
+        assert extract_workflow_id('not-a-dict') is None
+
+    def test_missing_extra_pnginfo_returns_none(self):
+        assert extract_workflow_id({}) is None
+
+    def test_missing_workflow_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': {}}) is None
+
+    def test_missing_id_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': {'workflow': {}}}) is None
+
+    def test_empty_string_id_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': {'workflow': {'id': ''}}}) is None
+
+    def test_non_string_id_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': {'workflow': {'id': 42}}}) is None
+
+    def test_non_dict_workflow_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': {'workflow': 'not-a-dict'}}) is None
+
+    def test_non_dict_extra_pnginfo_returns_none(self):
+        assert extract_workflow_id({'extra_pnginfo': 'not-a-dict'}) is None
+
+
 class TestJobStatus:
     """Test JobStatus constants."""