fix: hide Distributed Value backing fields in Nodes 2.0

Use native widget visibility without converting backing fields into sockets. Preserve widget types, serializers and options identity; cover edits, reload, worker refresh and linked widgets.

README.md

@@ -147,7 +147,7 @@ Accelerate Ultimate SD Upscaler by distributing video tiles across multiple work
 Control your distributed cluster programmatically without opening the browser.
 
 * **Endpoint:** `POST /distributed/queue`
-* **Functionality:** Accepts a standard ComfyUI workflow JSON, automatically distributes it to available workers, and returns the execution ID.
+* **Functionality:** Accepts a ComfyUI API-format prompt, dispatches it to the requested reachable workers, and returns the master `prompt_id`.
 * **Documentation:** [See API Examples & Scripts](https://github.com/robertvoy/ComfyUI-Distributed/blob/main/docs/comfyui-distributed-api.md)
 
 > **⚠️ Security Warning:** Do not expose your ComfyUI port to the public internet. If you need remote access, run ComfyUI behind a secure proxy (like Cloudflare or a VPN).
@@ -175,7 +175,7 @@ Use **Distributed Value** when you want per-worker overrides (for example, diffe
 | **Distributed Value** | Outputs per-worker override values with fallback to default |
 | **Ultimate SD Upscale Distributed** | Distributes upscale tiles across workers |
 | **Image Batch Divider** | Splits image batches for multi-GPU output |
-| **Audio Batch Divider** | Splits audio batches for multi-GPU output |
+| **Audio Segment Divider** | Splits an audio waveform into up to ten sequential time segments |
 | **Distributed Model Name** | Passes model paths to workers, enabling workflows to use models not present on the master in orchestrator-only mode |
 | **Distributed Empty Image** | Produces an empty IMAGE batch used when the master delegates all work |
 

__init__.py

@@ -1,29 +1,22 @@
-# Import everything needed from the main module
-from .distributed import (
-    NODE_CLASS_MAPPINGS as DISTRIBUTED_CLASS_MAPPINGS, 
-    NODE_DISPLAY_NAME_MAPPINGS as DISTRIBUTED_DISPLAY_NAME_MAPPINGS
-)
+"""ComfyUI-Distributed's native V3 extension entrypoint."""
+from comfy_api.v0_0_2 import ComfyExtension, io
 
-# Import utilities
-from .utils.config import ensure_config_exists, CONFIG_FILE
-from .utils.logging import debug_log
+from .nodes.v3 import NODES
+from .runtime.bootstrap import initialize
 
-# Import distributed upscale nodes
-from .nodes.distributed_upscale import (
-    NODE_CLASS_MAPPINGS as UPSCALE_CLASS_MAPPINGS,
-    NODE_DISPLAY_NAME_MAPPINGS as UPSCALE_DISPLAY_NAME_MAPPINGS
-)
+WEB_DIRECTORY = './web'
 
-WEB_DIRECTORY = "./web"
 
-ensure_config_exists()
+class DistributedExtension(ComfyExtension):
+    async def on_load(self) -> None:
+        initialize()
 
-# Merge node mappings
-NODE_CLASS_MAPPINGS = {**DISTRIBUTED_CLASS_MAPPINGS, **UPSCALE_CLASS_MAPPINGS}
-NODE_DISPLAY_NAME_MAPPINGS = {**DISTRIBUTED_DISPLAY_NAME_MAPPINGS, **UPSCALE_DISPLAY_NAME_MAPPINGS}
+    async def get_node_list(self) -> list[type[io.ComfyNode]]:
+        return list(NODES)
 
-__all__ = ['NODE_CLASS_MAPPINGS', 'NODE_DISPLAY_NAME_MAPPINGS']
 
-debug_log("Loaded Distributed nodes.")
-debug_log(f"Config file: {CONFIG_FILE}")
-debug_log(f"Available nodes: {list(NODE_CLASS_MAPPINGS.keys())}")
+async def comfy_entrypoint() -> DistributedExtension:
+    return DistributedExtension()
+
+
+__all__ = ['comfy_entrypoint', 'WEB_DIRECTORY']

api/job_routes.py

@@ -295,17 +295,24 @@ async def job_complete_endpoint(request):
             errors.append("worker_id: expected non-empty string")
         if not isinstance(batch_idx, int) or batch_idx < 0:
             errors.append("batch_idx: expected non-negative integer")
-        if not isinstance(image_payload, str) or not image_payload.strip():
+        image_provided = image_payload is not None
+        audio_provided = audio_payload is not None
+        if not image_provided and not audio_provided:
+            errors.append("expected at least one of image or audio")
+        if image_provided and (not isinstance(image_payload, str) or not image_payload.strip()):
             errors.append("image: expected non-empty base64 PNG string")
-        if audio_payload is not None and not isinstance(audio_payload, dict):
+        if audio_provided and not isinstance(audio_payload, dict):
             errors.append("audio: expected object when provided")
         if not isinstance(is_last, bool):
             errors.append("is_last: expected boolean")
         if errors:
             return await handle_api_error(request, errors, 400)
 
-        tensor = _decode_canonical_png_tensor(image_payload)
-        decoded_audio = _decode_audio_payload(audio_payload) if audio_payload is not None else None
+        try:
+            tensor = _decode_canonical_png_tensor(image_payload) if image_provided else None
+            decoded_audio = _decode_audio_payload(audio_payload) if audio_provided else None
+        except ValueError as exc:
+            return await handle_api_error(request, exc, 400)
         multi_job_id = job_id.strip()
         worker_id = worker_id.strip()
 

api/orchestration/prompt_transform.py

@@ -125,6 +125,209 @@ def _find_upstream_nodes(prompt_obj, start_ids):
     return connected
 
 
+_DELEGATE_MASTER_RETAINED_UPSTREAM_CLASSES = {
+    "PrimitiveBoolean",
+    "PrimitiveFloat",
+    "PrimitiveInt",
+    "PrimitiveNode",
+    "PrimitiveString",
+}
+
+_DELEGATE_MASTER_ALWAYS_RETAINED_UPSTREAM_CLASSES = {
+    "LoadImage",
+}
+
+_DELEGATE_MASTER_SAFE_SCALAR_TYPES = {"BOOLEAN", "FLOAT", "INT", "STRING"}
+_DELEGATE_MASTER_SAFE_LIST_TYPES = {"LIST"}
+
+# ComfyUI 0.23 exposes CreateList via the newer schema API rather than the
+# legacy RETURN_TYPES/INPUT_TYPES attributes. Treat it as a safe config utility
+# only after its connected inputs recursively prove safe.
+_DELEGATE_MASTER_SAFE_DYNAMIC_CONFIG_OUTPUT_CLASSES = {"CreateList"}
+_DELEGATE_MASTER_SAFE_DYNAMIC_CONFIG_INPUT_PREFIXES = {
+    "CreateList": ("inputs.",),
+}
+
+# Test hook. At runtime this stays None and the ComfyUI node registry is loaded lazily.
+_DELEGATE_MASTER_NODE_CLASS_MAPPINGS = None
+
+
+def _get_delegate_master_node_class_mappings():
+    """Return ComfyUI node-class mappings when available."""
+    if _DELEGATE_MASTER_NODE_CLASS_MAPPINGS is not None:
+        return _DELEGATE_MASTER_NODE_CLASS_MAPPINGS
+    try:
+        import nodes as comfy_nodes  # type: ignore
+    except Exception:  # pragma: no cover - depends on ComfyUI runtime imports
+        return {}
+    return getattr(comfy_nodes, "NODE_CLASS_MAPPINGS", {}) or {}
+
+
+def _get_delegate_master_node_class(class_type):
+    mappings = _get_delegate_master_node_class_mappings()
+    return mappings.get(class_type) if isinstance(mappings, dict) else None
+
+
+def _normalize_delegate_master_return_type(return_type):
+    if return_type is None:
+        return ""
+    return str(return_type).strip().upper()
+
+
+def _delegate_master_type_is_safe_scalar(type_name):
+    return type_name in _DELEGATE_MASTER_SAFE_SCALAR_TYPES
+
+
+def _delegate_master_type_is_safe_config(type_name):
+    return _delegate_master_type_is_safe_scalar(type_name) or type_name in _DELEGATE_MASTER_SAFE_LIST_TYPES
+
+
+def _delegate_master_output_is_safe_scalar(class_type, output_index):
+    """Return True when a registered node output is lightweight config data."""
+    if class_type in _DELEGATE_MASTER_SAFE_DYNAMIC_CONFIG_OUTPUT_CLASSES:
+        return True
+    node_class = _get_delegate_master_node_class(class_type)
+    return_types = getattr(node_class, "RETURN_TYPES", ()) if node_class is not None else ()
+    try:
+        output_type = return_types[int(output_index)]
+    except (IndexError, TypeError, ValueError):
+        return False
+    return _delegate_master_type_is_safe_config(_normalize_delegate_master_return_type(output_type))
+
+
+def _get_delegate_master_input_types(class_type):
+    node_class = _get_delegate_master_node_class(class_type)
+    input_types = getattr(node_class, "INPUT_TYPES", None) if node_class is not None else None
+    if callable(input_types):
+        try:
+            input_types = input_types()
+        except TypeError:
+            return {}
+    return input_types if isinstance(input_types, dict) else {}
+
+
+def _normalize_delegate_master_input_type(input_spec):
+    if isinstance(input_spec, (list, tuple)) and input_spec:
+        return _normalize_delegate_master_return_type(input_spec[0])
+    return _normalize_delegate_master_return_type(input_spec)
+
+
+def _delegate_master_input_is_safe_scalar(class_type, input_name):
+    """Return True when a registered downstream input expects config data."""
+    for prefix in _DELEGATE_MASTER_SAFE_DYNAMIC_CONFIG_INPUT_PREFIXES.get(class_type, ()):
+        if input_name.startswith(prefix):
+            return True
+    input_types = _get_delegate_master_input_types(class_type)
+    for section_name in ("required", "optional"):
+        section = input_types.get(section_name, {})
+        if isinstance(section, dict) and input_name in section:
+            input_type = _normalize_delegate_master_input_type(section[input_name])
+            return _delegate_master_type_is_safe_config(input_type)
+    return False
+
+
+def _is_delegate_master_always_retained_upstream_node(node):
+    if not isinstance(node, dict):
+        return False
+    class_type = node.get("class_type")
+    return isinstance(class_type, str) and class_type in _DELEGATE_MASTER_ALWAYS_RETAINED_UPSTREAM_CLASSES
+
+
+def _is_delegate_master_retained_upstream_node(node, output_index=0):
+    """Return True for lightweight upstream nodes safe to keep on the master."""
+    if not isinstance(node, dict):
+        return False
+    class_type = node.get("class_type")
+    if not isinstance(class_type, str):
+        return False
+    return (
+        class_type in _DELEGATE_MASTER_RETAINED_UPSTREAM_CLASSES
+        or class_type.startswith("Primitive")
+        or _delegate_master_output_is_safe_scalar(class_type, output_index)
+    )
+
+
+def _collect_delegate_master_retained_upstream_branch(
+    prompt_obj,
+    node_id,
+    output_index,
+    memo,
+    visiting,
+):
+    """Return safe retained branch nodes, or None when the branch is not safe."""
+    node_id = str(node_id)
+    cache_key = (node_id, output_index)
+    if cache_key in memo:
+        cached = memo[cache_key]
+        return None if cached is None else set(cached)
+    if cache_key in visiting:
+        memo[cache_key] = None
+        return None
+
+    node = prompt_obj.get(node_id)
+    if not _is_delegate_master_retained_upstream_node(node, output_index):
+        memo[cache_key] = None
+        return None
+
+    visiting.add(cache_key)
+    retained = {node_id}
+    inputs = node.get("inputs", {}) if isinstance(node, dict) else {}
+    class_type = node.get("class_type") if isinstance(node, dict) else None
+    for input_name, value in inputs.items():
+        if not (isinstance(value, list) and len(value) == 2):
+            continue
+        if not _delegate_master_input_is_safe_scalar(class_type, input_name):
+            visiting.remove(cache_key)
+            memo[cache_key] = None
+            return None
+        source_id = str(value[0])
+        branch = _collect_delegate_master_retained_upstream_branch(
+            prompt_obj,
+            source_id,
+            value[1],
+            memo,
+            visiting,
+        )
+        if branch is None:
+            visiting.remove(cache_key)
+            memo[cache_key] = None
+            return None
+        retained.update(branch)
+
+    visiting.remove(cache_key)
+    memo[cache_key] = frozenset(retained)
+    return retained
+
+
+def _find_delegate_master_retained_upstream_nodes(prompt_obj, start_ids):
+    """Return lightweight upstream nodes needed by kept delegate-master nodes."""
+    connected = set()
+    memo = {}
+    for node_id in start_ids:
+        node = prompt_obj.get(str(node_id)) or {}
+        inputs = node.get("inputs", {})
+        class_type = node.get("class_type") if isinstance(node, dict) else None
+        for input_name, value in inputs.items():
+            if not (isinstance(value, list) and len(value) == 2):
+                continue
+            source_node = prompt_obj.get(str(value[0]))
+            if _is_delegate_master_always_retained_upstream_node(source_node):
+                connected.add(str(value[0]))
+                continue
+            if not _delegate_master_input_is_safe_scalar(class_type, input_name):
+                continue
+            branch = _collect_delegate_master_retained_upstream_branch(
+                prompt_obj,
+                value[0],
+                value[1],
+                memo,
+                set(),
+            )
+            if branch is not None:
+                connected.update(branch)
+    return connected
+
+
 def prune_prompt_for_worker(prompt_obj):
     """Prune worker prompt to distributed nodes and their upstream dependencies."""
     collector_ids = find_nodes_by_class(prompt_obj, "DistributedCollector")
@@ -148,16 +351,33 @@ def prune_prompt_for_worker(prompt_obj):
         downstream = _find_downstream_nodes(prompt_obj, [dist_id])
         has_removed_downstream = any(node_id != dist_id for node_id in downstream)
         if has_removed_downstream:
-            preview_id = next_id()
-            pruned_prompt[preview_id] = {
-                "inputs": {
-                    "images": [dist_id, 0],
-                },
-                "class_type": "PreviewImage",
-                "_meta": {
-                    "title": "Preview Image (auto-added)",
-                },
-            }
+            original_node = prompt_obj.get(str(dist_id), {})
+            class_type = original_node.get("class_type")
+            inputs = original_node.get("inputs", {})
+            image_connected = class_type != "DistributedCollector" or (
+                isinstance(inputs.get("images"), list)
+                and len(inputs["images"]) == 2
+            )
+            audio_connected = (
+                class_type == "DistributedCollector"
+                and isinstance(inputs.get("audio"), list)
+                and len(inputs["audio"]) == 2
+            )
+
+            if image_connected:
+                preview_id = next_id()
+                pruned_prompt[preview_id] = {
+                    "inputs": {"images": [dist_id, 0]},
+                    "class_type": "PreviewImage",
+                    "_meta": {"title": "Preview Image (auto-added)"},
+                }
+            elif audio_connected:
+                preview_id = next_id()
+                pruned_prompt[preview_id] = {
+                    "inputs": {"audio": [dist_id, 1]},
+                    "class_type": "PreviewAudio",
+                    "_meta": {"title": "Preview Audio (auto-added)"},
+                }
 
     return pruned_prompt
 
@@ -167,6 +387,9 @@ def prepare_delegate_master_prompt(prompt_obj, collector_ids):
     downstream = _find_downstream_nodes(prompt_obj, collector_ids)
     nodes_to_keep = set(collector_ids)
     nodes_to_keep.update(downstream)
+    nodes_to_keep.update(
+        _find_delegate_master_retained_upstream_nodes(prompt_obj, nodes_to_keep)
+    )
 
     pruned_prompt = {}
     for node_id in nodes_to_keep:
@@ -194,6 +417,10 @@ def prepare_delegate_master_prompt(prompt_obj, collector_ids):
         collector_entry = pruned_prompt.get(collector_id)
         if not collector_entry:
             continue
+        original_inputs = (prompt_obj.get(collector_id) or {}).get("inputs", {})
+        original_images = original_inputs.get("images")
+        if not (isinstance(original_images, list) and len(original_images) == 2):
+            continue
         placeholder_id = next_id()
         pruned_prompt[placeholder_id] = {
             "class_type": "DistributedEmptyImage",

conftest.py

@@ -1,7 +1,7 @@
 # conftest.py — project-level pytest configuration.
 #
 # Problem: custom_nodes/ComfyUI-Distributed/__init__.py uses relative imports
-# (from .distributed import ...) that fail when pytest tries to import it as a
+# (from .nodes.v3 import ...) that fail when pytest tries to import it as a
 # standalone module during Package.setup() for the root package node.
 #
 # Fix: patch Package.setup() to skip the root-package's __init__.py import.

distributed.py

@@ -1,51 +0,0 @@
-"""
-ComfyUI-Distributed: thin entry point.
-All implementation lives in workers/, nodes/, api/.
-"""
-import atexit
-import os
-
-import server
-
-from .utils.config import ensure_config_exists
-from .utils.logging import debug_log
-from .utils.network import cleanup_client_session
-from .workers import get_worker_manager
-from .workers.startup import delayed_auto_launch, register_async_signals, sync_cleanup
-from .upscale.job_store import ensure_tile_jobs_initialized
-from .nodes import (
-    NODE_CLASS_MAPPINGS,
-    NODE_DISPLAY_NAME_MAPPINGS,
-    ImageBatchDivider,
-    DistributedCollectorNode,
-    DistributedSeed,
-    DistributedModelName,
-    DistributedValue,
-    AudioBatchDivider,
-    DistributedEmptyImage,
-    AnyType,
-    ByPassTypeTuple,
-    any_type,
-)
-from . import api  # noqa: F401 - triggers all @routes.* registrations
-from .api.queue_orchestration import ensure_distributed_state
-
-ensure_config_exists()
-
-# Aiohttp session cleanup
-async def _cleanup_session():
-    await cleanup_client_session()
-
-
-atexit.register(lambda: None)  # placeholder; real cleanup in sync_cleanup
-
-# Initialize distributed job state on prompt_server
-prompt_server = server.PromptServer.instance
-ensure_distributed_state(prompt_server)
-ensure_tile_jobs_initialized()
-
-# Worker startup
-if not os.environ.get('COMFYUI_IS_WORKER'):
-    atexit.register(sync_cleanup)
-    delayed_auto_launch()
-    register_async_signals()

docs/comfyui-distributed-api.md

@@ -19,8 +19,8 @@ This document describes the **public HTTP API** added to ComfyUI-Distributed to
 - `POST /distributed/queue` — queues a workflow using the same distributed orchestration rules as the UI:
   - Detects distributed nodes in the prompt (`DistributedCollector`, `UltimateSDUpscaleDistributed`).
   - Resolves enabled/selected workers.
-  - Pings workers (`GET /prompt`) to include only reachable ones.
-  - Dispatches the workflow to workers (`POST /prompt`).
+  - Probes and dispatches workers through `/distributed/worker_ws` by default.
+  - If `settings.websocket_orchestration=false`, probes with `GET /prompt` and dispatches with `POST /prompt` instead.
   - Queues the master workflow in ComfyUI’s prompt queue.
   - If any `DistributedCollector` has `load_balance=true`, selects one least-busy participant for this run.
 
@@ -61,7 +61,8 @@ Queue a workflow for distributed execution.
 #### Fields
 
 - `prompt` (required unless `workflow.prompt` is present, object)
-  - The ComfyUI prompt/workflow graph, same shape as used by `POST /prompt`.
+  - A complete ComfyUI API-format prompt graph, using the same shape as `POST /prompt`.
+  - This is not the normal visual workflow export from the ComfyUI editor.
 - `workflow` (optional, object)
   - Workflow metadata that ComfyUI normally stores in `extra_pnginfo.workflow`.
   - If you don’t care about UI metadata, you can omit it.
@@ -123,10 +124,14 @@ $cfg.workers | Select-Object id,name,enabled,host,port,type | Format-Table -Auto
 
 ## Worker requirements (important)
 
-For a worker to participate, it must be reachable from the master:
+For a worker to participate, it must be reachable from the master. By default:
+
+- WebSocket probe and dispatch: `<worker-base>/distributed/worker_ws` must accept the connection.
+
+If `settings.websocket_orchestration=false`:
 
 - Health check: `GET <worker-base>/prompt` must return HTTP 200.
-- Dispatch: `POST <worker-base>/prompt` must accept the workflow.
+- Dispatch: `POST <worker-base>/prompt` must accept the prompt.
 
 Also, for collector-based flows:
 
@@ -201,7 +206,7 @@ Proxy endpoint on master that fetches logs from a configured remote/cloud worker
 
 ## Examples
 
-### 1) Minimal `curl`
+### 1) Minimal `curl` request envelope
 
 ```bash
 curl -X POST "http://127.0.0.1:8188/distributed/queue" \
@@ -209,18 +214,23 @@ curl -X POST "http://127.0.0.1:8188/distributed/queue" \
   -d @payload.json
 ```
 
-Where `payload.json` contains at least:
+`payload.json` must contain a complete ComfyUI API-format prompt. The abbreviated envelope below illustrates the request shape but is not directly executable:
 
 ```json
 {
   "prompt": {
-    "1": {"class_type": "KSampler", "inputs": {} }
+    "<node_id>": {
+      "class_type": "<node class>",
+      "inputs": {"<required_input>": "<value or connection>"}
+    }
   },
   "enabled_worker_ids": [],
   "client_id": "external-client"
 }
 ```
 
+Export or construct a valid API-format prompt with all required node inputs and at least one output node before submitting it.
+
 ### 2) Python (`requests`)
 
 ```python

docs/v3-migration.md

@@ -0,0 +1,53 @@
+# Native V3 node API
+
+The package registers one `ComfyExtension` through `comfy_entrypoint()` and
+imports the versioned `comfy_api.v0_0_2` API. Use a ComfyUI version that provides
+that API; there is no V1 registration fallback.
+
+## Compatibility
+
+- All eight node IDs, display names, categories, visible input order, defaults
+  and output order are retained. Existing execution algorithms remain in the
+  private collector, utilities and upscale modules.
+- The image/audio dividers explicitly declare ten typed outputs. Their existing
+  frontend extensions still show only the selected number of outputs. This
+  replaces the V1 `ByPassTypeTuple` indexing workaround without changing saved
+  IMAGE/AUDIO socket indices or the ten returned values.
+- Standard hidden context uses `cls.hidden`. Worker/orchestration metadata keeps
+  its existing prompt-input names and Python defaults via `accept_all_inputs`;
+  it does not become visible widgets.
+- The collector retains list-input handling. Upscale retains its always-changing
+  fingerprint and creates a private runtime helper for each V3 execution, so
+  mutable helper state is not attached to sanitized V3 class clones.
+- Routes, distributed state and the existing worker startup/shutdown hooks are
+  initialized by `runtime/bootstrap.py` during `ComfyExtension.on_load()`.
+  Worker mode still suppresses automatic worker launch. `distributed.py` is no
+  longer an entrypoint.
+
+## Verification
+
+Run ordinary unit tests from this repository:
+
+```bash
+python -m pytest tests -q -o addopts=
+```
+
+Opt into real-framework acceptance using a ComfyUI checkout and its interpreter:
+
+```bash
+COMFYUI_SOURCE_ROOT=/path/to/ComfyUI \
+  /path/to/ComfyUI/.venv/bin/python -m pytest tests -q -o addopts=
+```
+
+The acceptance subprocess uses CPU mode and the real ComfyUI loader, input
+parser, V3 class preparation, prompt validation and `PromptExecutor`. It compares
+all node schemas with the V1 fixture, checks all five bundled workflows' node
+IDs and socket/link contracts, exercises injected worker metadata, image/audio
+lists, collector aggregation and divider outputs, rejects invalid upscale enums,
+and decodes an actual preview PNG referenced by executor history.
+
+The upscale GPU/model boundary is mocked to check argument forwarding and
+per-execution helper isolation. Full checkpoint inference, browser canvas
+acceptance and multi-host HTTP transport are not exercised. No HTTP listener,
+workers or model downloads are started; preview files use a temporary scratch
+directory. The test does not install this branch into a live custom-node folder.

docs/worker-setup-guides.md

@@ -79,7 +79,7 @@ The master can either contribute GPU work or stay in **orchestrator-only** mode:
 📺 [Watch Tutorial](https://www.youtube.com/watch?v=wxKKWMQhYTk)
 
 **On Runpod:**
-> If using your own template, make sure you launch ComfyUI with the `--enable-cors-header` argument and you `git clone ComfyUI-Distributed` into custom_nodes. ⚠️ **Required!**
+> If using your own template, launch ComfyUI with `--listen --enable-cors-header` and clone `ComfyUI-Distributed` into `custom_nodes`. ⚠️ **Required!**
 
 1. Register a [Runpod](https://get.runpod.io/0bw29uf3ug0p) account.
 2. On Runpod, go to Storage > New Network Volume and create a volume that will store the models you need. Start with 40 GB, you can always add more later. Learn more [about Network Volumes](https://docs.runpod.io/pods/storage/create-network-volumes).
@@ -92,7 +92,7 @@ The master can either contribute GPU work or stay in **orchestrator-only** mode:
 	- SAGE_ATTENTION: optional optimisation (set to true/false)
 5. Deploy your pod.
 6. Connect to your pod using JupyterLabs. This gives us access to the pod's file system.
-7. Download models into /workspaces/ComfyUI/models/ (these will remain on your network drive even after you terminate the pod). Example commands below:
+7. Download models into `/workspace/ComfyUI/models/` (these will remain on your network drive even after you terminate the pod). Example commands below:
 ```
 # Download from CivitAI
 comfy model download --url https://civitai.com/api/download/models/1759168 --relative-path /workspace/ComfyUI/models/checkpoints --set-civitai-api-token $CIVITAI_API_TOKEN

nodes/__init__.py

@@ -1,31 +1 @@
-from .utilities import (
-    DistributedSeed,
-    DistributedModelName,
-    DistributedValue,
-    ImageBatchDivider,
-    AudioBatchDivider,
-    DistributedEmptyImage,
-    AnyType,
-    ByPassTypeTuple,
-    any_type,
-)
-from .collector import DistributedCollectorNode
-
-NODE_CLASS_MAPPINGS = {
-    "DistributedCollector": DistributedCollectorNode,
-    "DistributedSeed": DistributedSeed,
-    "DistributedModelName": DistributedModelName,
-    "DistributedValue": DistributedValue,
-    "ImageBatchDivider": ImageBatchDivider,
-    "AudioBatchDivider": AudioBatchDivider,
-    "DistributedEmptyImage": DistributedEmptyImage,
-}
-NODE_DISPLAY_NAME_MAPPINGS = {
-    "DistributedCollector": "Distributed Collector",
-    "DistributedSeed": "Distributed Seed",
-    "DistributedModelName": "Distributed Model Name",
-    "DistributedValue": "Distributed Value",
-    "ImageBatchDivider": "Image Batch Divider",
-    "AudioBatchDivider": "Audio Batch Divider",
-    "DistributedEmptyImage": "Distributed Empty Image",
-}
+"""Private execution helpers; public registration lives in nodes.v3."""

nodes/collector.py

@@ -29,7 +29,6 @@ class DistributedCollectorNode:
     def INPUT_TYPES(s):
         return {
             "required": {
-                "images": ("IMAGE",),
                 "load_balance": (
                     "BOOLEAN",
                     {
@@ -38,7 +37,10 @@ class DistributedCollectorNode:
                     },
                 ),
             },
-            "optional": { "audio": ("AUDIO",) },
+            "optional": {
+                "images": ("IMAGE",),
+                "audio": ("AUDIO",),
+            },
             "hidden": {
                 "multi_job_id": ("STRING", {"default": ""}),
                 "is_worker": ("BOOLEAN", {"default": False}),
@@ -102,8 +104,9 @@ class DistributedCollectorNode:
             return None
         return {"waveform": torch.cat(waveforms, dim=-1), "sample_rate": sample_rate}
 
-    def run(self, images, load_balance=False, audio=None, multi_job_id="", is_worker=False, master_url="", enabled_worker_ids="[]", worker_batch_size=1, worker_id="", pass_through=False, delegate_only=False):
-        images = self._normalize_images_input(images)
+    def run(self, images=None, load_balance=False, audio=None, multi_job_id="", is_worker=False, master_url="", enabled_worker_ids="[]", worker_batch_size=1, worker_id="", pass_through=False, delegate_only=False):
+        if images is not None:
+            images = self._normalize_images_input(images)
         audio = self._normalize_audio_input(audio)
         load_balance = self._unwrap_list_input(load_balance)
         multi_job_id = self._unwrap_list_input(multi_job_id)
@@ -115,6 +118,14 @@ class DistributedCollectorNode:
         pass_through = self._unwrap_list_input(pass_through)
         delegate_only = self._unwrap_list_input(delegate_only)
 
+        remote_only_master = (
+            bool(multi_job_id)
+            and not is_worker
+            and (delegate_only or is_master_delegate_only())
+        )
+        if images is None and audio is None and not remote_only_master:
+            raise ValueError("DistributedCollector requires at least one image or audio input")
+
         # Create empty audio if not provided
         empty_audio = {"waveform": torch.zeros(1, 2, 1), "sample_rate": 44100}
 
@@ -141,41 +152,56 @@ class DistributedCollectorNode:
         return result
 
     async def send_batch_to_master(self, image_batch, audio, multi_job_id, master_url, worker_id):
-        """Send image batch to master via canonical JSON envelopes."""
-        batch_size = image_batch.shape[0]
-        if batch_size == 0:
-            return
-
+        """Send an image batch, optionally with audio, or an audio-only completion."""
         encoded_audio = encode_audio_payload(audio)
-
         session = await get_client_session()
         url = f"{master_url}/distributed/job_complete"
-        for batch_idx in range(batch_size):
-            img = tensor_to_pil(image_batch[batch_idx:batch_idx+1], 0)
-            byte_io = io.BytesIO()
-            img.save(byte_io, format='PNG', compress_level=0)
-            encoded_image = base64.b64encode(byte_io.getvalue()).decode('utf-8')
-            payload = {
-                "job_id": str(multi_job_id),
-                "worker_id": str(worker_id),
-                "batch_idx": int(batch_idx),
-                "image": f"data:image/png;base64,{encoded_image}",
-                "is_last": bool(batch_idx == batch_size - 1),
-            }
-            if payload["is_last"] and encoded_audio is not None:
-                payload["audio"] = encoded_audio
 
+        payloads = []
+        batch_size = 0 if image_batch is None else image_batch.shape[0]
+        if batch_size == 0:
+            if encoded_audio is None:
+                raise ValueError("Worker completion requires image or audio data")
+            payloads.append(
+                {
+                    "job_id": str(multi_job_id),
+                    "worker_id": str(worker_id),
+                    "batch_idx": 0,
+                    "audio": encoded_audio,
+                    "is_last": True,
+                }
+            )
+        else:
+            for batch_idx in range(batch_size):
+                img = tensor_to_pil(image_batch[batch_idx:batch_idx+1], 0)
+                byte_io = io.BytesIO()
+                img.save(byte_io, format='PNG', compress_level=0)
+                encoded_image = base64.b64encode(byte_io.getvalue()).decode('utf-8')
+                payload = {
+                    "job_id": str(multi_job_id),
+                    "worker_id": str(worker_id),
+                    "batch_idx": int(batch_idx),
+                    "image": f"data:image/png;base64,{encoded_image}",
+                    "is_last": bool(batch_idx == batch_size - 1),
+                }
+                if payload["is_last"] and encoded_audio is not None:
+                    payload["audio"] = encoded_audio
+                payloads.append(payload)
+
+        for payload in payloads:
+            timeout_seconds = 60 if "image" in payload else 600
             try:
                 async with session.post(
                     url,
                     json=payload,
-                    timeout=aiohttp.ClientTimeout(total=60),
+                    timeout=aiohttp.ClientTimeout(total=timeout_seconds),
                 ) as response:
                     response.raise_for_status()
             except Exception as e:
-                log(f"Worker - Failed to send canonical image envelope to master: {e}")
+                media_type = "image/audio" if "image" in payload else "audio-only"
+                log(f"Worker - Failed to send canonical {media_type} envelope to master: {e}")
                 debug_log(f"Worker - Full error details: URL={url}")
-                raise  # Re-raise to handle at caller level
+                raise
 
     def _combine_audio(self, master_audio, worker_audio, empty_audio, worker_order=None):
         """Combine audio from master and workers into a single audio output.
@@ -257,8 +283,8 @@ class DistributedCollectorNode:
         images_on_cpu,
         delegate_mode: bool,
         fallback_images,
-    ) -> torch.Tensor:
-        """Assemble final tensor: master first, then workers in enabled order."""
+    ):
+        """Assemble final tensor, or return None when the job contains only audio."""
         ordered_tensors = []
         if not delegate_mode and images_on_cpu is not None:
             for i in range(master_batch_size):
@@ -289,15 +315,15 @@ class DistributedCollectorNode:
 
         if cpu_tensors:
             return ensure_contiguous(torch.cat(cpu_tensors, dim=0))
-        elif fallback_images is not None:
+        if fallback_images is not None:
             return ensure_contiguous(fallback_images)
-        else:
-            raise ValueError("No image data collected from master or workers")
+        return None
 
     async def execute(self, images, audio, load_balance=False, multi_job_id="", is_worker=False, master_url="", enabled_worker_ids="[]", worker_batch_size=1, worker_id="", delegate_only=False):
         if is_worker:
             # Worker mode: send images and audio to master in a single batch
-            debug_log(f"Worker - Job {multi_job_id} complete. Sending {images.shape[0]} image(s) to master")
+            image_count = 0 if images is None else images.shape[0]
+            debug_log(f"Worker - Job {multi_job_id} complete. Sending {image_count} image(s) to master")
             await self.send_batch_to_master(images, audio, multi_job_id, master_url, worker_id)
             return (images, audio if audio is not None else self.EMPTY_AUDIO)
         else:
@@ -332,14 +358,15 @@ class DistributedCollectorNode:
                 master_audio = None
                 debug_log(f"Master - Job {multi_job_id}: Delegate-only mode enabled, collecting exclusively from {num_workers} workers")
             else:
-                images_on_cpu = images.cpu()
-                master_batch_size = images.shape[0]
+                if images is None:
+                    images_on_cpu = None
+                    master_batch_size = 0
+                else:
+                    images_on_cpu = ensure_contiguous(images.cpu())
+                    master_batch_size = images.shape[0]
                 master_audio = audio  # Keep master's audio for later
                 debug_log(f"Master - Job {multi_job_id}: Master has {master_batch_size} images, collecting from {num_workers} workers...")
 
-                # Ensure master images are contiguous
-                images_on_cpu = ensure_contiguous(images_on_cpu)
-
 
             # Initialize storage for collected images and audio
             worker_images = {}  # Dict to store images by worker_id and index
@@ -511,18 +538,19 @@ class DistributedCollectorNode:
                 if multi_job_id in prompt_server.distributed_pending_jobs:
                     del prompt_server.distributed_pending_jobs[multi_job_id]
 
+            combined_audio = self._combine_audio(master_audio, worker_audio, self.EMPTY_AUDIO, enabled_workers)
             try:
                 combined = self._reorder_and_combine_tensors(
                     worker_images, enabled_workers, master_batch_size, images_on_cpu, delegate_mode, images
                 )
-                debug_log(f"Master - Job {multi_job_id} complete. Combined {combined.shape[0]} images total "
-                          f"(master: {master_batch_size}, workers: {combined.shape[0] - master_batch_size})")
-
-                # Combine audio from master and workers
-                combined_audio = self._combine_audio(master_audio, worker_audio, self.EMPTY_AUDIO, enabled_workers)
+                if combined is None:
+                    debug_log(f"Master - Job {multi_job_id} complete with audio only")
+                else:
+                    debug_log(f"Master - Job {multi_job_id} complete. Combined {combined.shape[0]} images total "
+                              f"(master: {master_batch_size}, workers: {combined.shape[0] - master_batch_size})")
 
                 return (combined, combined_audio)
             except Exception as e:
                 log(f"Master - Error combining images: {e}")
-                # Return just the master images as fallback
-                return (images, audio if audio is not None else self.EMPTY_AUDIO)
+                # Preserve collected audio even when image assembly fails.
+                return (images, combined_audio)

nodes/distributed_upscale.py

@@ -56,22 +56,22 @@ class UltimateSDUpscaleDistributed(
     """
     Distributed version of Ultimate SD Upscale (No Upscale).
     
-    Supports three processing modes:
+    Supports two currently selected processing modes:
     1. Single GPU: No workers available, process everything locally
-    2. Static Mode: Small batches, distributes tiles across workers (flattened)
-    3. Dynamic Mode: Large batches, assigns whole images to workers dynamically
+    2. Distributed tile queue: Workers pull tiles from a shared queue
     
     Features:
-    - Multi-mode batch handling for efficient video/image upscaling
+    - Tile-based batch handling for video/image upscaling
     - Tiled VAE support for memory efficiency
-    - Dynamic load balancing for large batches
+    - Shared work queue so faster workers can process more tiles
     - Backward compatible with single-image workflows
     
     Environment Variables:
     - COMFYUI_MAX_BATCH: Chunk size for tile sending (default 20)
     - COMFYUI_MAX_PAYLOAD_SIZE: Max API payload bytes (default 50MB)
     
-    Threshold: dynamic_threshold input controls mode switch (default 8)
+    The hidden dynamic_threshold input is retained for workflow compatibility but
+    does not affect the current mode-selection policy.
     """
 
     def __init__(self):
@@ -268,12 +268,3 @@ class UltimateSDUpscaleDistributed(
 
 # Ensure initialization before registering routes
 ensure_tile_jobs_initialized()
-
-# Node registration
-NODE_CLASS_MAPPINGS = {
-    "UltimateSDUpscaleDistributed": UltimateSDUpscaleDistributed,
-}
-
-NODE_DISPLAY_NAME_MAPPINGS = {
-    "UltimateSDUpscaleDistributed": "Ultimate SD Upscale Distributed (No Upscale)",
-}

nodes/utilities.py

@@ -269,7 +269,7 @@ class ImageBatchDivider:
 
 
 class AudioBatchDivider:
-    """Divides an audio waveform into multiple parts along the time/samples dimension."""
+    """Divides an audio waveform into sequential segments along the time dimension."""
 
     @classmethod
     def INPUT_TYPES(s):
@@ -282,7 +282,7 @@ class AudioBatchDivider:
                     "max": 10,
                     "step": 1,
                     "display": "number",
-                    "tooltip": "Number of parts to divide the audio into"
+                    "tooltip": "Number of sequential time segments to create"
                 }),
             }
         }

nodes/v3.py

@@ -0,0 +1,181 @@
+"""Native V3 schemas with the existing execution algorithms kept intact.
+
+Runtime objects are private, per-execution helpers, not registered V1 nodes.
+This avoids sharing mutable instance state through V3's sanitized class clones.
+"""
+import comfy.samplers
+from comfy_api.v0_0_2 import io
+
+from . import utilities as _utilities
+from .collector import DistributedCollectorNode as _CollectorRuntime
+from .distributed_upscale import UltimateSDUpscaleDistributed as _UpscaleRuntime
+
+
+class DistributedSeed(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='DistributedSeed', display_name='Distributed Seed', category='utils',
+            inputs=[io.Int.Input('seed', default=1125899906842, min=0,
+                                 max=1125899906842624, force_input=False)],
+            outputs=[io.Int.Output(display_name='seed')],
+            accept_all_inputs=True,
+        )
+
+    @classmethod
+    def execute(cls, seed, is_worker=False, worker_id=''):
+        return io.NodeOutput(*_utilities.DistributedSeed().distribute(seed, is_worker, worker_id))
+
+
+class DistributedValue(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='DistributedValue', display_name='Distributed Value', category='utils',
+            inputs=[io.String.Input('default_value', default=''),
+                    io.String.Input('worker_values', default='{}')],
+            outputs=[io.AnyType.Output(display_name='value')],
+            accept_all_inputs=True,
+        )
+
+    @classmethod
+    def execute(cls, default_value, worker_values='{}', is_worker=False, worker_id=''):
+        return io.NodeOutput(*_utilities.DistributedValue().distribute(
+            default_value, worker_values, is_worker, worker_id))
+
+
+class DistributedModelName(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='DistributedModelName', display_name='Distributed Model Name', category='utils',
+            inputs=[io.String.Input('text', default='')],
+            outputs=[io.AnyType.Output(display_name='output')],
+            hidden=[io.Hidden.unique_id, io.Hidden.extra_pnginfo], is_output_node=True,
+        )
+
+    @classmethod
+    def execute(cls, text):
+        result = _utilities.DistributedModelName().log_input(
+            text, unique_id=cls.hidden.unique_id, extra_pnginfo=cls.hidden.extra_pnginfo)
+        return io.NodeOutput(*result['result'], ui=result['ui'])
+
+
+class ImageBatchDivider(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='ImageBatchDivider', display_name='Image Batch Divider', category='image',
+            inputs=[io.Image.Input('images'),
+                    io.Int.Input('divide_by', default=2, min=1, max=10, step=1,
+                                 display_mode=io.NumberDisplay.number,
+                                 tooltip='Number of parts to divide the batch into')],
+            # The existing frontend still displays only divide_by sockets.
+            outputs=[io.Image.Output(display_name=f'batch_{index + 1}') for index in range(10)],
+            is_output_node=True,
+        )
+
+    @classmethod
+    def execute(cls, images, divide_by):
+        return io.NodeOutput(*_utilities.ImageBatchDivider().divide_batch(images, divide_by))
+
+
+class AudioBatchDivider(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='AudioBatchDivider', display_name='Audio Segment Divider', category='audio',
+            inputs=[io.Audio.Input('audio'),
+                    io.Int.Input('divide_by', default=2, min=1, max=10, step=1,
+                                 display_mode=io.NumberDisplay.number,
+                                 tooltip='Number of sequential time segments to create')],
+            outputs=[io.Audio.Output(display_name=f'audio_{index + 1}') for index in range(10)],
+            is_output_node=True,
+        )
+
+    @classmethod
+    def execute(cls, audio, divide_by):
+        return io.NodeOutput(*_utilities.AudioBatchDivider().divide_audio(audio, divide_by))
+
+
+class DistributedEmptyImage(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='DistributedEmptyImage', display_name='Distributed Empty Image', category='image',
+            inputs=[io.Int.Input('height', default=64, min=1, max=4096, step=1),
+                    io.Int.Input('width', default=64, min=1, max=4096, step=1),
+                    io.Int.Input('channels', default=3, min=1, max=4, step=1)],
+            outputs=[io.Image.Output()],
+        )
+
+    @classmethod
+    def execute(cls, height, width, channels):
+        return io.NodeOutput(*_utilities.DistributedEmptyImage().create(height, width, channels))
+
+
+class DistributedCollector(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='DistributedCollector', display_name='Distributed Collector', category='image',
+            inputs=[io.Boolean.Input('load_balance', default=False,
+                                     tooltip='Run this workflow on one least-busy participant (master included when participating).'),
+                    io.Image.Input('images', optional=True), io.Audio.Input('audio', optional=True)],
+            outputs=[io.Image.Output(display_name='images'), io.Audio.Output(display_name='audio')],
+            is_input_list=True, accept_all_inputs=True,
+        )
+
+    @classmethod
+    def execute(cls, images=None, load_balance=False, audio=None, multi_job_id='',
+                is_worker=False, master_url='', enabled_worker_ids='[]', worker_batch_size=1,
+                worker_id='', pass_through=False, delegate_only=False):
+        return io.NodeOutput(*_CollectorRuntime().run(
+            images=images, load_balance=load_balance, audio=audio, multi_job_id=multi_job_id,
+            is_worker=is_worker, master_url=master_url, enabled_worker_ids=enabled_worker_ids,
+            worker_batch_size=worker_batch_size, worker_id=worker_id,
+            pass_through=pass_through, delegate_only=delegate_only))
+
+
+class UltimateSDUpscaleDistributed(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id='UltimateSDUpscaleDistributed',
+            display_name='Ultimate SD Upscale Distributed (No Upscale)', category='image/upscaling',
+            inputs=[
+                io.Image.Input('upscaled_image'), io.Model.Input('model'),
+                io.Conditioning.Input('positive'), io.Conditioning.Input('negative'), io.Vae.Input('vae'),
+                io.Int.Input('seed', default=0, min=0, max=0xffffffffffffffff),
+                io.Int.Input('steps', default=20, min=1, max=10000),
+                io.Float.Input('cfg', default=8.0, min=0.0, max=100.0),
+                io.Combo.Input('sampler_name', options=comfy.samplers.KSampler.SAMPLERS),
+                io.Combo.Input('scheduler', options=comfy.samplers.KSampler.SCHEDULERS),
+                io.Float.Input('denoise', default=0.5, min=0.0, max=1.0, step=0.01),
+                io.Int.Input('tile_width', default=512, min=64, max=2048, step=8),
+                io.Int.Input('tile_height', default=512, min=64, max=2048, step=8),
+                io.Int.Input('padding', default=32, min=0, max=256, step=8),
+                io.Int.Input('mask_blur', default=8, min=0, max=256),
+                io.Boolean.Input('force_uniform_tiles', default=True),
+                io.Boolean.Input('tiled_decode', default=False),
+            ], outputs=[io.Image.Output()], accept_all_inputs=True,
+        )
+
+    @classmethod
+    def fingerprint_inputs(cls, **kwargs):
+        return _UpscaleRuntime.IS_CHANGED(**kwargs)
+
+    @classmethod
+    def execute(cls, upscaled_image, model, positive, negative, vae, seed, steps, cfg,
+                sampler_name, scheduler, denoise, tile_width, tile_height, padding,
+                mask_blur, force_uniform_tiles, tiled_decode, multi_job_id='', is_worker=False,
+                master_url='', enabled_worker_ids='[]', worker_id='', tile_indices='', dynamic_threshold=8):
+        return io.NodeOutput(*_UpscaleRuntime().run(
+            upscaled_image, model, positive, negative, vae, seed, steps, cfg,
+            sampler_name, scheduler, denoise, tile_width, tile_height, padding,
+            mask_blur, force_uniform_tiles, tiled_decode, multi_job_id, is_worker,
+            master_url, enabled_worker_ids, worker_id, tile_indices, dynamic_threshold))
+
+
+NODES = [DistributedCollector, DistributedSeed, DistributedModelName, DistributedValue,
+         ImageBatchDivider, AudioBatchDivider, DistributedEmptyImage, UltimateSDUpscaleDistributed]

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "ComfyUI-Distributed"
 description = "ComfyUI extension that enables multi-GPU processing locally, remotely and in the cloud"
-version = "1.4.4"
+version = "1.4.7"
 license = {file = "LICENSE"}
 dependencies  = []
 

runtime/__init__.py

@@ -0,0 +1 @@
+"""Internal extension lifecycle support (not a node provider)."""

runtime/bootstrap.py

@@ -0,0 +1,35 @@
+"""Initialize routes, distributed state and the existing worker lifecycle."""
+import atexit
+import os
+
+import server
+
+from ..utils.config import CONFIG_FILE, ensure_config_exists
+from ..utils.logging import debug_log
+from ..workers.startup import delayed_auto_launch, register_async_signals, sync_cleanup
+from ..upscale.job_store import ensure_tile_jobs_initialized
+
+_initialized = False
+
+
+def initialize():
+    """Called by ComfyExtension.on_load; initialize once per loaded package."""
+    global _initialized
+    if _initialized:
+        return
+
+    ensure_config_exists()
+    from .. import api  # noqa: F401 - registers the existing @routes.* handlers
+    from ..api.queue_orchestration import ensure_distributed_state
+
+    ensure_distributed_state(server.PromptServer.instance)
+    ensure_tile_jobs_initialized()
+
+    if not os.environ.get('COMFYUI_IS_WORKER'):
+        atexit.register(sync_cleanup)
+        delayed_auto_launch()
+        register_async_signals()
+
+    _initialized = True
+    debug_log('Loaded Distributed nodes.')
+    debug_log(f'Config file: {CONFIG_FILE}')

tests/api/test_distributed_queue.py

@@ -302,6 +302,77 @@ class JobCompleteAudioPayloadTests(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(queued["audio"]["sample_rate"], 44100)
         self.assertEqual(tuple(queued["audio"]["waveform"].shape), (1, 2, 4))
 
+    async def test_job_complete_accepts_audio_without_image(self):
+        queue = asyncio.Queue()
+        job_routes.prompt_server.distributed_jobs_lock = asyncio.Lock()
+        job_routes.prompt_server.distributed_pending_jobs = {"audio-only-job": queue}
+        request = _FakeRequest(
+            {
+                "job_id": "audio-only-job",
+                "worker_id": "worker-1",
+                "batch_idx": 0,
+                "audio": self._encoded_audio_payload(),
+                "is_last": True,
+            }
+        )
+
+        with patch.object(job_routes, "_decode_canonical_png_tensor") as decode_image:
+            response = await job_routes.job_complete_endpoint(request)
+
+        self.assertEqual(response.status, 200)
+        decode_image.assert_not_called()
+        queued = await queue.get()
+        self.assertIsNone(queued["tensor"])
+        self.assertEqual(queued["audio"]["sample_rate"], 44100)
+
+    async def test_job_complete_rejects_payload_without_image_or_audio(self):
+        request = _FakeRequest(
+            {
+                "job_id": "job-1",
+                "worker_id": "worker-1",
+                "batch_idx": 0,
+                "is_last": True,
+            }
+        )
+
+        response = await job_routes.job_complete_endpoint(request)
+
+        self.assertEqual(response.status, 400)
+        self.assertIn("image or audio", response.payload.get("message", "").lower())
+
+    async def test_job_complete_rejects_invalid_image_even_when_audio_is_present(self):
+        request = _FakeRequest(
+            {
+                "job_id": "job-1",
+                "worker_id": "worker-1",
+                "batch_idx": 0,
+                "image": 123,
+                "audio": self._encoded_audio_payload(),
+                "is_last": True,
+            }
+        )
+
+        response = await job_routes.job_complete_endpoint(request)
+
+        self.assertEqual(response.status, 400)
+        self.assertIn("image", response.payload.get("message", "").lower())
+
+    async def test_job_complete_returns_400_for_malformed_audio(self):
+        request = _FakeRequest(
+            {
+                "job_id": "job-1",
+                "worker_id": "worker-1",
+                "batch_idx": 0,
+                "audio": {"data": "AAAA", "shape": [1, 2], "dtype": "float32"},
+                "is_last": True,
+            }
+        )
+
+        response = await job_routes.job_complete_endpoint(request)
+
+        self.assertEqual(response.status, 400)
+        self.assertIn("audio.shape", response.payload.get("message", "").lower())
+
     def test_decode_audio_payload_rejects_bad_shape(self):
         bad = {
             "sample_rate": 44100,

tests/fixtures/v1_node_contracts.json

@@ -0,0 +1,691 @@
+{
+  "DistributedCollector": {
+    "input": {
+      "required": {
+        "load_balance": [
+          "BOOLEAN",
+          {
+            "default": false,
+            "tooltip": "Run this workflow on one least-busy participant (master included when participating)."
+          }
+        ]
+      },
+      "optional": {
+        "images": [
+          "IMAGE"
+        ],
+        "audio": [
+          "AUDIO"
+        ]
+      },
+      "hidden": {
+        "multi_job_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "is_worker": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ],
+        "master_url": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "enabled_worker_ids": [
+          "STRING",
+          {
+            "default": "[]"
+          }
+        ],
+        "worker_batch_size": [
+          "INT",
+          {
+            "default": 1,
+            "min": 1,
+            "max": 1024
+          }
+        ],
+        "worker_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "pass_through": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ],
+        "delegate_only": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "load_balance"
+      ],
+      "optional": [
+        "images",
+        "audio"
+      ],
+      "hidden": [
+        "multi_job_id",
+        "is_worker",
+        "master_url",
+        "enabled_worker_ids",
+        "worker_batch_size",
+        "worker_id",
+        "pass_through",
+        "delegate_only"
+      ]
+    },
+    "output": [
+      "IMAGE",
+      "AUDIO"
+    ],
+    "output_name": [
+      "images",
+      "audio"
+    ],
+    "output_is_list": [
+      false,
+      false
+    ],
+    "is_input_list": true,
+    "output_node": false,
+    "category": "image",
+    "display_name": "Distributed Collector"
+  },
+  "DistributedSeed": {
+    "input": {
+      "required": {
+        "seed": [
+          "INT",
+          {
+            "default": 1125899906842,
+            "min": 0,
+            "max": 1125899906842624,
+            "forceInput": false
+          }
+        ]
+      },
+      "hidden": {
+        "is_worker": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ],
+        "worker_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "seed"
+      ],
+      "hidden": [
+        "is_worker",
+        "worker_id"
+      ]
+    },
+    "output": [
+      "INT"
+    ],
+    "output_name": [
+      "seed"
+    ],
+    "output_is_list": [
+      false
+    ],
+    "is_input_list": false,
+    "output_node": false,
+    "category": "utils",
+    "display_name": "Distributed Seed"
+  },
+  "DistributedModelName": {
+    "input": {
+      "required": {
+        "text": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ]
+      },
+      "hidden": {
+        "unique_id": "UNIQUE_ID",
+        "extra_pnginfo": "EXTRA_PNGINFO"
+      }
+    },
+    "input_order": {
+      "required": [
+        "text"
+      ],
+      "hidden": [
+        "unique_id",
+        "extra_pnginfo"
+      ]
+    },
+    "output": [
+      "*"
+    ],
+    "output_name": [
+      "output"
+    ],
+    "output_is_list": [
+      false
+    ],
+    "is_input_list": false,
+    "output_node": true,
+    "category": "utils",
+    "display_name": "Distributed Model Name"
+  },
+  "DistributedValue": {
+    "input": {
+      "required": {
+        "default_value": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "worker_values": [
+          "STRING",
+          {
+            "default": "{}"
+          }
+        ]
+      },
+      "hidden": {
+        "is_worker": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ],
+        "worker_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "default_value",
+        "worker_values"
+      ],
+      "hidden": [
+        "is_worker",
+        "worker_id"
+      ]
+    },
+    "output": [
+      "*"
+    ],
+    "output_name": [
+      "value"
+    ],
+    "output_is_list": [
+      false
+    ],
+    "is_input_list": false,
+    "output_node": false,
+    "category": "utils",
+    "display_name": "Distributed Value"
+  },
+  "ImageBatchDivider": {
+    "input": {
+      "required": {
+        "images": [
+          "IMAGE"
+        ],
+        "divide_by": [
+          "INT",
+          {
+            "default": 2,
+            "min": 1,
+            "max": 10,
+            "step": 1,
+            "display": "number",
+            "tooltip": "Number of parts to divide the batch into"
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "images",
+        "divide_by"
+      ]
+    },
+    "output": [
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*"
+    ],
+    "output_name": [
+      "batch_1",
+      "batch_2",
+      "batch_3",
+      "batch_4",
+      "batch_5",
+      "batch_6",
+      "batch_7",
+      "batch_8",
+      "batch_9",
+      "batch_10"
+    ],
+    "output_is_list": [
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ],
+    "is_input_list": false,
+    "output_node": true,
+    "category": "image",
+    "display_name": "Image Batch Divider"
+  },
+  "AudioBatchDivider": {
+    "input": {
+      "required": {
+        "audio": [
+          "AUDIO"
+        ],
+        "divide_by": [
+          "INT",
+          {
+            "default": 2,
+            "min": 1,
+            "max": 10,
+            "step": 1,
+            "display": "number",
+            "tooltip": "Number of sequential time segments to create"
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "audio",
+        "divide_by"
+      ]
+    },
+    "output": [
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*",
+      "*"
+    ],
+    "output_name": [
+      "audio_1",
+      "audio_2",
+      "audio_3",
+      "audio_4",
+      "audio_5",
+      "audio_6",
+      "audio_7",
+      "audio_8",
+      "audio_9",
+      "audio_10"
+    ],
+    "output_is_list": [
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ],
+    "is_input_list": false,
+    "output_node": true,
+    "category": "audio",
+    "display_name": "Audio Segment Divider"
+  },
+  "DistributedEmptyImage": {
+    "input": {
+      "required": {
+        "height": [
+          "INT",
+          {
+            "default": 64,
+            "min": 1,
+            "max": 4096,
+            "step": 1
+          }
+        ],
+        "width": [
+          "INT",
+          {
+            "default": 64,
+            "min": 1,
+            "max": 4096,
+            "step": 1
+          }
+        ],
+        "channels": [
+          "INT",
+          {
+            "default": 3,
+            "min": 1,
+            "max": 4,
+            "step": 1
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "height",
+        "width",
+        "channels"
+      ]
+    },
+    "output": [
+      "IMAGE"
+    ],
+    "output_name": [
+      "IMAGE"
+    ],
+    "output_is_list": [
+      false
+    ],
+    "is_input_list": false,
+    "output_node": false,
+    "category": "image",
+    "display_name": "Distributed Empty Image"
+  },
+  "UltimateSDUpscaleDistributed": {
+    "input": {
+      "required": {
+        "upscaled_image": [
+          "IMAGE"
+        ],
+        "model": [
+          "MODEL"
+        ],
+        "positive": [
+          "CONDITIONING"
+        ],
+        "negative": [
+          "CONDITIONING"
+        ],
+        "vae": [
+          "VAE"
+        ],
+        "seed": [
+          "INT",
+          {
+            "default": 0,
+            "min": 0,
+            "max": 18446744073709551615
+          }
+        ],
+        "steps": [
+          "INT",
+          {
+            "default": 20,
+            "min": 1,
+            "max": 10000
+          }
+        ],
+        "cfg": [
+          "FLOAT",
+          {
+            "default": 8.0,
+            "min": 0.0,
+            "max": 100.0
+          }
+        ],
+        "sampler_name": [
+          [
+            "euler",
+            "euler_cfg_pp",
+            "euler_ancestral",
+            "euler_ancestral_cfg_pp",
+            "heun",
+            "heunpp2",
+            "exp_heun_2_x0",
+            "exp_heun_2_x0_sde",
+            "dpm_2",
+            "dpm_2_ancestral",
+            "lms",
+            "dpm_fast",
+            "dpm_adaptive",
+            "dpmpp_2s_ancestral",
+            "dpmpp_2s_ancestral_cfg_pp",
+            "dpmpp_sde",
+            "dpmpp_sde_gpu",
+            "dpmpp_2m",
+            "dpmpp_2m_cfg_pp",
+            "dpmpp_2m_sde",
+            "dpmpp_2m_sde_gpu",
+            "dpmpp_2m_sde_heun",
+            "dpmpp_2m_sde_heun_gpu",
+            "dpmpp_3m_sde",
+            "dpmpp_3m_sde_gpu",
+            "ddpm",
+            "lcm",
+            "ipndm",
+            "ipndm_v",
+            "deis",
+            "cfgpp_ud10_ab",
+            "res_multistep",
+            "res_multistep_cfg_pp",
+            "res_multistep_ancestral",
+            "res_multistep_ancestral_cfg_pp",
+            "gradient_estimation",
+            "gradient_estimation_cfg_pp",
+            "er_sde",
+            "seeds_2",
+            "seeds_3",
+            "sa_solver",
+            "sa_solver_pece",
+            "ddim",
+            "uni_pc",
+            "uni_pc_bh2"
+          ]
+        ],
+        "scheduler": [
+          [
+            "simple",
+            "sgm_uniform",
+            "karras",
+            "exponential",
+            "ddim_uniform",
+            "beta",
+            "normal",
+            "linear_quadratic",
+            "kl_optimal"
+          ]
+        ],
+        "denoise": [
+          "FLOAT",
+          {
+            "default": 0.5,
+            "min": 0.0,
+            "max": 1.0,
+            "step": 0.01
+          }
+        ],
+        "tile_width": [
+          "INT",
+          {
+            "default": 512,
+            "min": 64,
+            "max": 2048,
+            "step": 8
+          }
+        ],
+        "tile_height": [
+          "INT",
+          {
+            "default": 512,
+            "min": 64,
+            "max": 2048,
+            "step": 8
+          }
+        ],
+        "padding": [
+          "INT",
+          {
+            "default": 32,
+            "min": 0,
+            "max": 256,
+            "step": 8
+          }
+        ],
+        "mask_blur": [
+          "INT",
+          {
+            "default": 8,
+            "min": 0,
+            "max": 256
+          }
+        ],
+        "force_uniform_tiles": [
+          "BOOLEAN",
+          {
+            "default": true
+          }
+        ],
+        "tiled_decode": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ]
+      },
+      "hidden": {
+        "multi_job_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "is_worker": [
+          "BOOLEAN",
+          {
+            "default": false
+          }
+        ],
+        "master_url": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "enabled_worker_ids": [
+          "STRING",
+          {
+            "default": "[]"
+          }
+        ],
+        "worker_id": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "tile_indices": [
+          "STRING",
+          {
+            "default": ""
+          }
+        ],
+        "dynamic_threshold": [
+          "INT",
+          {
+            "default": 8,
+            "min": 1,
+            "max": 64
+          }
+        ]
+      }
+    },
+    "input_order": {
+      "required": [
+        "upscaled_image",
+        "model",
+        "positive",
+        "negative",
+        "vae",
+        "seed",
+        "steps",
+        "cfg",
+        "sampler_name",
+        "scheduler",
+        "denoise",
+        "tile_width",
+        "tile_height",
+        "padding",
+        "mask_blur",
+        "force_uniform_tiles",
+        "tiled_decode"
+      ],
+      "hidden": [
+        "multi_job_id",
+        "is_worker",
+        "master_url",
+        "enabled_worker_ids",
+        "worker_id",
+        "tile_indices",
+        "dynamic_threshold"
+      ]
+    },
+    "output": [
+      "IMAGE"
+    ],
+    "output_name": [
+      "IMAGE"
+    ],
+    "output_is_list": [
+      false
+    ],
+    "is_input_list": false,
+    "output_node": false,
+    "category": "image/upscaling",
+    "display_name": "Ultimate SD Upscale Distributed (No Upscale)"
+  }
+}

tests/helpers/v3_runtime_check.py

@@ -0,0 +1,252 @@
+"""Exercise the actual loader, schemas and executor in a fresh CPU process.
+
+No HTTP listener, workers, model downloads or live installation changes.
+The original contracts were captured from 32ac027 using the same core.
+"""
+import asyncio
+import inspect
+import json
+import os
+from pathlib import Path
+import sys
+import tempfile
+from unittest.mock import patch
+
+from PIL import Image
+
+ROOT = Path(__file__).resolve().parents[2]
+COMFY_ROOT = Path(sys.argv[1]).resolve()
+sys.path.insert(0, str(COMFY_ROOT))
+os.environ['COMFYUI_IS_WORKER'] = '1'
+import comfy.cli_args
+comfy.cli_args.args.cpu = True
+comfy.cli_args.args.disable_assets = True
+from app.assets.manager import default_asset_manager
+from comfy_api.v0_0_2 import io
+import execution
+import nodes
+import server
+import torch
+
+BASELINE = json.loads((ROOT / 'tests/fixtures/v1_node_contracts.json').read_text())
+
+
+def normalized_input(value):
+    kind = value[0]
+    opts = dict(value[1]) if len(value) > 1 else {}
+    if kind == 'STRING':
+        # V3 serializes the same default single-line widget explicitly.
+        opts.setdefault('multiline', False)
+    if kind == 'COMBO':
+        kind = opts['options']
+        opts = {key: val for key, val in opts.items() if key != 'options'}
+    if isinstance(kind, list):
+        # Single-selection is the V1 dropdown default as well.
+        opts.setdefault('multiselect', False)
+    return [kind, opts]
+
+
+async def map_node(cls, values, extra=None):
+    """Use the actual input parser and sanitized V3 executor clones."""
+    prepared, missing, hidden = execution.get_input_data(values, cls, unique_id='probe', extra_data=extra or {})
+    assert not missing, missing
+    # Use a worker thread for synchronous nodes: collector/upscale bridge back
+    # to PromptServer's running loop, just as ComfyUI's prompt worker does.
+    def run():
+        return asyncio.run(execution._async_map_node_over_list(
+            'v3-acceptance', 'probe', cls, prepared, cls.FUNCTION, v3_data=hidden))
+    return await asyncio.to_thread(run)
+
+
+def check_saved_workflows(mapping):
+    checked = 0
+    occurrences = 0
+    for path in sorted((ROOT / 'workflows').glob('*.json')):
+        workflow = json.loads(path.read_text())
+        local_nodes = {node['id']: node for node in workflow['nodes']}
+        for saved in workflow['nodes']:
+            if saved['type'] not in mapping:
+                continue
+            occurrences += 1
+            info = mapping[saved['type']].GET_NODE_INFO_V1()
+            inputs = {**info['input'].get('required', {}), **info['input'].get('optional', {})}
+            for socket in saved.get('inputs', []):
+                assert socket['name'] in inputs, (path.name, saved['id'], socket)
+                assert socket['type'] == inputs[socket['name']][0], (path.name, socket)
+            for index, output in enumerate(saved.get('outputs', [])):
+                assert output['type'] == info['output'][index], (path.name, index)
+            for link in workflow['links']:
+                if link[1] == saved['id']:
+                    assert link[2] < len(info['output']), (path.name, link)
+                    target = local_nodes[link[3]]['inputs'][link[4]]
+                    assert target['type'] == info['output'][link[2]], (path.name, link)
+        checked += 1
+    assert checked == 5 and occurrences == 10, (checked, occurrences)
+    print('SAVED_WORKFLOW_CONTRACTS_OK', checked, occurrences)
+
+
+async def check_execution(mapping, module, prompt_server, asset_manager):
+    result = await map_node(mapping['DistributedSeed'],
+                            {'seed': 123, 'is_worker': True, 'worker_id': 'worker_2'})
+    assert result[0].result == (126,)
+    values = json.dumps({'_type': 'INT', '3': '17'})
+    result = await map_node(mapping['DistributedValue'],
+                            {'default_value': '4', 'worker_values': values,
+                             'is_worker': True, 'worker_id': 'worker_2'})
+    assert result[0].result == (17,)
+    metadata = {'workflow': {'nodes': [{'id': 'probe', 'widgets_values': []}]}}
+    result = await map_node(mapping['DistributedModelName'], {'text': 'model.ckpt'},
+                            {'extra_pnginfo': metadata})
+    assert result[0].result == ('model.ckpt',)
+    assert result[0].ui == {'text': ['model.ckpt']}
+    assert metadata['workflow']['nodes'][0]['widgets_values'] == [['model.ckpt']]
+    result = await map_node(mapping['DistributedEmptyImage'],
+                            {'height': 8, 'width': 8, 'channels': 3})
+    empty = result[0].result[0]
+    assert empty.shape == (0, 8, 8, 3) and empty.numel() == 0
+    images = torch.arange(10 * 8 * 8 * 3, dtype=torch.float32).reshape(10, 8, 8, 3)
+    for count in (1, 3, 10):
+        result = await map_node(mapping['ImageBatchDivider'], {'images': images, 'divide_by': count})
+        assert len(result[0].result) == 10
+        assert torch.equal(torch.cat(result[0].result[:count]), images)
+    audio = {'waveform': torch.arange(33, dtype=torch.float32).reshape(1, 1, 33), 'sample_rate': 24000}
+    result = await map_node(mapping['AudioBatchDivider'], {'audio': audio, 'divide_by': 3})
+    assert len(result[0].result) == 10
+    assert torch.equal(torch.cat([item['waveform'] for item in result[0].result[:3]], dim=-1), audio['waveform'])
+    # INPUT_IS_LIST must preserve all images/audio but unwrap transport scalars.
+    collector = mapping['DistributedCollector']
+    prepared, missing, hidden = execution.get_input_data(
+        {'load_balance': False, 'multi_job_id': '', 'pass_through': True}, collector, 'collector-list')
+    assert not missing
+    prepared['images'] = [images[:2], images[2:]]
+    prepared['audio'] = [audio, audio]
+    result = await execution._async_map_node_over_list(
+        'v3-acceptance', 'collector-list', collector, prepared, collector.FUNCTION, v3_data=hidden)
+    assert torch.equal(result[0].result[0], images)
+    assert result[0].result[1]['waveform'].shape[-1] == 66
+    # Exercise real async aggregation without an HTTP endpoint or worker.
+    queue = asyncio.Queue()
+    await queue.put({'worker_id': 'worker_2', 'tensor': images[2:3], 'image_index': 0, 'is_last': True})
+    prompt_server.distributed_pending_jobs['v3-aggregate'] = queue
+    result = await map_node(collector,
+                            {'images': images[:2], 'load_balance': False,
+                             'multi_job_id': 'v3-aggregate', 'enabled_worker_ids': '["worker_2"]'})
+    assert torch.equal(result[0].result[0], images[:3])
+    assert 'v3-aggregate' not in prompt_server.distributed_pending_jobs
+
+    # Prove V3's per-execution class clones do not leak helper instance state;
+    # replace only the GPU/model boundary, not the input parser or executor.
+    upscale_runtime = sys.modules[module.__name__ + '.nodes.distributed_upscale'].UltimateSDUpscaleDistributed
+    seen = []
+    def fake_upscale(self, *args):
+        assert not hasattr(self, 'acceptance_marker')
+        self.acceptance_marker = True
+        seen.append(args)
+        return (args[0],)
+    inputs = {'upscaled_image': images, 'model': object(), 'positive': [], 'negative': [],
+              'vae': object(), 'seed': 1, 'steps': 1, 'cfg': 1.0,
+              'sampler_name': 'euler', 'scheduler': 'normal', 'denoise': 0.5,
+              'tile_width': 64, 'tile_height': 64, 'padding': 0, 'mask_blur': 0,
+              'force_uniform_tiles': True, 'tiled_decode': False,
+              'multi_job_id': 'tile-job', 'is_worker': True, 'master_url': 'http://master.invalid',
+              'enabled_worker_ids': '["worker_2"]', 'worker_id': 'worker_2',
+              'tile_indices': '[2,3]', 'dynamic_threshold': 9}
+    with patch.object(upscale_runtime, 'run', fake_upscale):
+        for _ in range(2):
+            result = await map_node(mapping['UltimateSDUpscaleDistributed'], inputs)
+            assert result[0].result[0] is images
+    assert len(seen) == 2 and seen[0][-7:] == tuple(inputs[name] for name in (
+        'multi_job_id', 'is_worker', 'master_url', 'enabled_worker_ids', 'worker_id',
+        'tile_indices', 'dynamic_threshold')), seen[0]
+    import math
+    assert math.isnan(mapping['UltimateSDUpscaleDistributed'].fingerprint_inputs(multi_job_id='tile-job'))
+    assert math.isnan(mapping['UltimateSDUpscaleDistributed'].fingerprint_inputs(multi_job_id=''))
+
+    graph = {
+        '1': {'class_type': 'EmptyImage', 'inputs': {'height': 8, 'width': 8, 'batch_size': 10, 'color': 0}},
+        '2': {'class_type': 'DistributedCollector', 'inputs': {'images': ['1', 0], 'load_balance': False,
+                                                              'pass_through': True}},
+        '3': {'class_type': 'ImageBatchDivider', 'inputs': {'images': ['2', 0], 'divide_by': 10}},
+        '4': {'class_type': 'PreviewImage', 'inputs': {'images': ['3', 9]}},
+    }
+    valid = await execution.validate_prompt('v3-graph', graph, None)
+    assert valid[0], valid
+    invalid = {'1': {'class_type': 'UltimateSDUpscaleDistributed',
+                     'inputs': {**inputs, 'sampler_name': 'INVALID_ENUM', 'scheduler': 'INVALID_ENUM'}},
+               '2': {'class_type': 'PreviewImage', 'inputs': {'images': ['1', 0]}}}
+    rejected = await execution.validate_prompt('v3-invalid', invalid, None)
+    assert not rejected[0]
+    errors = [error for entry in rejected[3].values() for error in entry['errors']]
+    enum_errors = [error['extra_info']['input_name'] for error in errors if error['type'] == 'value_not_in_list']
+    assert {'sampler_name', 'scheduler'} <= set(enum_errors), errors
+    import folder_paths
+    scratch = Path(os.environ.get('TMPDIR', Path.home() / '.hermes/cache/scratch'))
+    with tempfile.TemporaryDirectory(prefix='v3-preview-', dir=scratch) as temp:
+        with patch.object(folder_paths, 'temp_directory', temp):
+            executor = execution.PromptExecutor(
+                prompt_server, cache_args={'ram': 0, 'ram_inactive': 0}, asset_manager=asset_manager)
+            await asyncio.to_thread(executor.execute, graph, 'v3-graph', {}, valid[2])
+            assert executor.success, executor.status_messages
+            history = executor.history_result
+            record = history['outputs']['4']['images'][0]
+            preview = Path(temp) / record.get('subfolder', '') / record['filename']
+            with Image.open(preview) as image:
+                assert image.size == (8, 8) and image.mode == 'RGB'
+                assert image.getextrema() == ((0, 0), (0, 0), (0, 0))
+    print('V3_EXECUTION_OK eight nodes; upscale GPU boundary mocked; preview artifact verified')
+
+
+async def main():
+    asset_manager = default_asset_manager()
+    prompt_server = server.PromptServer(asyncio.get_running_loop(), asset_manager)
+    assert not (ROOT / 'distributed.py').exists(), 'obsolete root bootstrap remains'
+    assert await nodes.load_custom_node(str(ROOT)), 'ComfyUI loader rejected the pack'
+    module = sys.modules[str(ROOT).replace('.', '_x_')]
+    assert not hasattr(module, 'NODE_CLASS_MAPPINGS'), 'V1 map shadows V3 entrypoint'
+    extension = await module.comfy_entrypoint()
+    classes = await extension.get_node_list()
+    mapping = {cls.GET_SCHEMA().node_id: cls for cls in classes}
+    assert len(classes) == len(mapping) == len(BASELINE) == 8
+    assert set(mapping) == set(BASELINE)
+    for node_id, cls in mapping.items():
+        assert issubclass(cls, io.ComfyNode)
+        assert nodes.NODE_CLASS_MAPPINGS[node_id] is cls
+        old = dict(BASELINE[node_id])
+        if node_id in ('ImageBatchDivider', 'AudioBatchDivider'):
+            # V1's ByPassTypeTuple advertises '*' when indexed, while its
+            # underlying tuple and existing frontend declare IMAGE/AUDIO.
+            # Native V3 declares all ten existing typed sockets explicitly.
+            assert old['output'] == ['*'] * 10
+            old['output'] = ['IMAGE' if node_id == 'ImageBatchDivider' else 'AUDIO'] * 10
+        new = json.loads(json.dumps(cls.GET_NODE_INFO_V1()))
+        for group in ('required', 'optional'):
+            old_inputs = old['input'].get(group, {})
+            new_inputs = new['input'].get(group, {})
+            assert list(old_inputs) == list(new_inputs), (node_id, group, 'input order')
+            for name, original in old_inputs.items():
+                assert normalized_input(original) == normalized_input(new_inputs[name]), (node_id, name, original, new_inputs[name])
+        for key in ('output', 'output_name', 'output_is_list', 'is_input_list', 'output_node', 'category', 'display_name'):
+            assert old[key] == new[key], (node_id, key, old[key], new[key])
+        # Standard context lives in cls.hidden; orchestrator metadata remains
+        # accepted by its original kwarg name, without creating new widgets.
+        signature = inspect.signature(cls.execute)
+        for name, field in old['input'].get('hidden', {}).items():
+            if isinstance(field, list):
+                assert cls.GET_SCHEMA().accept_all_inputs, node_id
+                assert name in signature.parameters, (node_id, name)
+                assert signature.parameters[name].default == field[1]['default'], (node_id, name)
+            else:
+                assert name in new['input']['hidden'], (node_id, name)
+        expected_hidden = []
+        if node_id == 'DistributedModelName':
+            expected_hidden.extend(['unique_id', 'extra_pnginfo'])
+        if old['output_node']:
+            expected_hidden.extend(name for name in ['prompt', 'extra_pnginfo'] if name not in expected_hidden)
+        assert list(new['input'].get('hidden', {})) == expected_hidden, (node_id, new['input'].get('hidden'))
+    print('SCHEMA_PARITY_OK', len(mapping))
+    check_saved_workflows(mapping)
+    await check_execution(mapping, module, prompt_server, asset_manager)
+    print('V3_ACCEPTANCE_OK')
+
+
+asyncio.run(main())

tests/test_collector_list_inputs.py

@@ -124,6 +124,49 @@ def test_collector_opts_into_comfyui_list_inputs():
     assert collector.INPUT_IS_LIST is True
 
 
+def test_collector_exposes_images_as_optional_input():
+    input_types = _load_collector_module().DistributedCollectorNode.INPUT_TYPES()
+
+    assert "images" not in input_types["required"]
+    assert input_types["optional"]["images"] == ("IMAGE",)
+
+
+def test_audio_only_pass_through_returns_no_images_and_preserves_audio():
+    collector = _load_collector_module().DistributedCollectorNode()
+    audio = {"waveform": torch.ones(1, 2, 4), "sample_rate": 48000}
+
+    images, returned_audio = collector.run(images=None, audio=[audio])
+
+    assert images is None
+    assert returned_audio is audio
+
+
+def test_collector_rejects_missing_images_and_audio():
+    collector = _load_collector_module().DistributedCollectorNode()
+
+    try:
+        collector.run(images=None, audio=None)
+    except ValueError as exc:
+        assert "image or audio" in str(exc).lower()
+    else:
+        raise AssertionError("Expected collector to reject a run with no media input")
+
+
+def test_delegate_only_master_allows_no_local_media_input():
+    collector = _load_collector_module().DistributedCollectorNode()
+
+    images, audio = collector.run(
+        images=None,
+        audio=None,
+        multi_job_id=["delegate-audio-job"],
+        delegate_only=[True],
+        enabled_worker_ids=["[]"],
+    )
+
+    assert images is None
+    assert tuple(audio["waveform"].shape) == (1, 2, 1)
+
+
 def test_pass_through_collapses_comfyui_image_list_to_batch_and_unwraps_hidden_inputs():
     collector = _load_collector_module().DistributedCollectorNode()
     first = torch.zeros(1, 2, 2, 3)
@@ -203,3 +246,119 @@ def test_worker_list_input_sends_one_completion_sequence_with_last_only_on_final
     assert [payload["is_last"] for payload in posted_payloads] == [False, True]
     assert {payload["job_id"] for payload in posted_payloads} == {"job-list-1"}
     assert {payload["worker_id"] for payload in posted_payloads} == {"worker-a"}
+
+
+def test_audio_only_worker_sends_one_completion_without_image():
+    module = _load_collector_module()
+    collector = module.DistributedCollectorNode()
+    audio = {"waveform": torch.ones(1, 2, 4), "sample_rate": 48000}
+    posted = []
+
+    class _FakeResponse:
+        async def __aenter__(self):
+            return self
+
+        async def __aexit__(self, exc_type, exc, tb):
+            return False
+
+        def raise_for_status(self):
+            return None
+
+    class _FakeSession:
+        def post(self, url, json, timeout):
+            posted.append((url, json, timeout.total))
+            return _FakeResponse()
+
+    async def _fake_get_client_session():
+        return _FakeSession()
+
+    module.get_client_session = _fake_get_client_session
+    module.encode_audio_payload = lambda value: {"encoded": value is audio}
+
+    images, returned_audio = collector.run(
+        images=None,
+        audio=[audio],
+        multi_job_id=["audio-job"],
+        is_worker=[True],
+        master_url=["http://master"],
+        worker_id=["worker-a"],
+    )
+
+    assert images is None
+    assert returned_audio is audio
+    assert len(posted) == 1
+    assert posted[0][0] == "http://master/distributed/job_complete"
+    assert posted[0][2] == 600
+    assert posted[0][1] == {
+        "job_id": "audio-job",
+        "worker_id": "worker-a",
+        "batch_idx": 0,
+        "audio": {"encoded": True},
+        "is_last": True,
+    }
+
+
+def test_audio_only_master_combines_local_and_worker_audio():
+    module = _load_collector_module()
+    collector = module.DistributedCollectorNode()
+    master_audio = {"waveform": torch.ones(1, 2, 2), "sample_rate": 48000}
+    worker_audio = {"waveform": torch.full((1, 2, 3), 2.0), "sample_rate": 48000}
+    module.prompt_server.distributed_jobs_lock = asyncio.Lock()
+    queue = asyncio.Queue()
+    queue.put_nowait(
+        {
+            "worker_id": "worker-a",
+            "image_index": 0,
+            "tensor": None,
+            "audio": worker_audio,
+            "is_last": True,
+        }
+    )
+    module.prompt_server.distributed_pending_jobs = {"audio-job": queue}
+
+    images, combined_audio = asyncio.run(
+        collector.execute(
+            images=None,
+            audio=master_audio,
+            multi_job_id="audio-job",
+            enabled_worker_ids='["worker-a"]',
+        )
+    )
+
+    assert images is None
+    assert combined_audio["sample_rate"] == 48000
+    assert tuple(combined_audio["waveform"].shape) == (1, 2, 5)
+    assert torch.equal(combined_audio["waveform"][..., :2], master_audio["waveform"])
+    assert torch.equal(combined_audio["waveform"][..., 2:], worker_audio["waveform"])
+
+
+def test_delegate_only_audio_collects_worker_audio_without_placeholder_image():
+    module = _load_collector_module()
+    collector = module.DistributedCollectorNode()
+    worker_audio = {"waveform": torch.full((1, 2, 3), 2.0), "sample_rate": 48000}
+    module.prompt_server.distributed_jobs_lock = asyncio.Lock()
+    queue = asyncio.Queue()
+    queue.put_nowait(
+        {
+            "worker_id": "worker-a",
+            "image_index": 0,
+            "tensor": None,
+            "audio": worker_audio,
+            "is_last": True,
+        }
+    )
+    module.prompt_server.distributed_pending_jobs = {"delegate-audio-job": queue}
+
+    images, combined_audio = asyncio.run(
+        collector.execute(
+            images=None,
+            audio=None,
+            multi_job_id="delegate-audio-job",
+            enabled_worker_ids='["worker-a"]',
+            delegate_only=True,
+        )
+    )
+
+    assert images is None
+    assert combined_audio["sample_rate"] == 48000
+    assert torch.equal(combined_audio["waveform"], worker_audio["waveform"])

tests/test_prompt_transform.py

@@ -71,6 +71,15 @@ def _collector_only_prompt():
     }
 
 
+def _audio_only_prompt():
+    """1(Audio source) → 2(DistributedCollector) → 3(Audio sink)."""
+    return {
+        "1": {"class_type": "LoadAudio", "inputs": {}},
+        "2": {"class_type": "DistributedCollector", "inputs": {"audio": ["1", 0]}},
+        "3": {"class_type": "SaveAudio", "inputs": {"audio": ["2", 1]}},
+    }
+
+
 def _delegate_prompt():
     """1 → 2 → 3(DistributedCollector) → 4(SaveImage)"""
     return {
@@ -217,6 +226,35 @@ class PrunePromptForWorkerTests(unittest.TestCase):
         self.assertEqual(len(preview_nodes), 1)
         self.assertEqual(preview_nodes[0]["inputs"]["images"], ["4", 0])
 
+    def test_injects_preview_audio_for_audio_only_collector(self):
+        result = pt.prune_prompt_for_worker(_audio_only_prompt())
+        preview_nodes = [n for n in result.values() if n.get("class_type") == "PreviewAudio"]
+        self.assertEqual(len(preview_nodes), 1)
+        self.assertEqual(preview_nodes[0]["inputs"]["audio"], ["2", 1])
+        self.assertFalse(any(n.get("class_type") == "PreviewImage" for n in result.values()))
+
+    def test_prefers_image_preview_when_collector_has_images_and_audio(self):
+        prompt = _linear_prompt()
+        prompt["6"] = {"class_type": "LoadAudio", "inputs": {}}
+        prompt["4"]["inputs"]["audio"] = ["6", 0]
+        result = pt.prune_prompt_for_worker(prompt)
+        self.assertEqual(
+            len([n for n in result.values() if n.get("class_type") == "PreviewImage"]),
+            1,
+        )
+        self.assertFalse(any(n.get("class_type") == "PreviewAudio" for n in result.values()))
+
+    def test_preserves_image_preview_for_distributed_upscale(self):
+        prompt = {
+            "1": {"class_type": "LoadImage", "inputs": {}},
+            "2": {"class_type": "UltimateSDUpscaleDistributed", "inputs": {"upscaled_image": ["1", 0]}},
+            "3": {"class_type": "SaveImage", "inputs": {"images": ["2", 0]}},
+        }
+        result = pt.prune_prompt_for_worker(prompt)
+        preview_nodes = [n for n in result.values() if n.get("class_type") == "PreviewImage"]
+        self.assertEqual(len(preview_nodes), 1)
+        self.assertEqual(preview_nodes[0]["inputs"]["images"], ["2", 0])
+
     def test_no_preview_image_when_no_downstream(self):
         result = pt.prune_prompt_for_worker(_collector_only_prompt())
         preview_nodes = [n for n in result.values() if n.get("class_type") == "PreviewImage"]
@@ -242,7 +280,7 @@ class PrunePromptForWorkerTests(unittest.TestCase):
     def test_upscale_node_is_treated_as_distributed(self):
         prompt = {
             "1": {"class_type": "KSampler", "inputs": {}},
-            "2": {"class_type": "UltimateSDUpscaleDistributed", "inputs": {"image": ["1", 0]}},
+            "2": {"class_type": "UltimateSDUpscaleDistributed", "inputs": {"upscaled_image": ["1", 0]}},
             "3": {"class_type": "SaveImage", "inputs": {"images": ["2", 0]}},
         }
         result = pt.prune_prompt_for_worker(prompt)
@@ -285,17 +323,522 @@ class PrepareDelegateMasterPromptTests(unittest.TestCase):
         placeholder_id = empty_nodes[0][0]
         self.assertEqual(result["3"]["inputs"]["images"], [placeholder_id, 0])
 
+    def test_audio_only_collector_does_not_get_image_placeholder(self):
+        prompt = _audio_only_prompt()
+        result = pt.prepare_delegate_master_prompt(prompt, ["2"])
+        empty_nodes = [n for n in result.values() if n.get("class_type") == "DistributedEmptyImage"]
+        self.assertEqual(empty_nodes, [])
+        self.assertNotIn("images", result["2"].get("inputs", {}))
+        self.assertNotIn("audio", result["2"].get("inputs", {}))
+
     def test_one_placeholder_per_collector(self):
         """Two collectors → two placeholders."""
         prompt = {
-            "1": {"class_type": "DistributedCollector", "inputs": {}},
-            "2": {"class_type": "DistributedCollector", "inputs": {}},
+            "1": {"class_type": "DistributedCollector", "inputs": {"images": ["10", 0]}},
+            "2": {"class_type": "DistributedCollector", "inputs": {"images": ["11", 0]}},
             "3": {"class_type": "SaveImage", "inputs": {"images": ["1", 0]}},
+            "10": {"class_type": "LoadImage", "inputs": {}},
+            "11": {"class_type": "LoadImage", "inputs": {}},
         }
         result = pt.prepare_delegate_master_prompt(prompt, ["1", "2"])
         empty_nodes = [n for n in result.values() if n.get("class_type") == "DistributedEmptyImage"]
         self.assertEqual(len(empty_nodes), 2)
 
+    def test_preserves_primitive_string_for_downstream_required_input(self):
+        """Delegate-only master keeps primitive inputs needed by SaveImage."""
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {"SaveImage": save_image}
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "test/input_bug"}},
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["15", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertIn("15", result)
+        self.assertEqual(result["15"], prompt["15"])
+        self.assertEqual(result["9"]["inputs"]["filename_prefix"], ["15", 0])
+
+    def test_does_not_preserve_non_primitive_upstream_for_collector(self):
+        prompt = _delegate_prompt()
+        result = pt.prepare_delegate_master_prompt(prompt, ["3"])
+
+        self.assertNotIn("2", result)
+        self.assertNotEqual(result["3"]["inputs"]["images"], ["2", 0])
+
+    def test_preserves_load_image_for_switch_alternate_required_input(self):
+        """Delegate-only master keeps LoadImage inputs needed by switches."""
+        prompt = {
+            "848": {"class_type": "LoadImage", "inputs": {"image": "input_bug2_00003_.png"}},
+            "862": {"class_type": "VAEDecode", "inputs": {}},
+            "854": {"class_type": "DistributedCollector", "inputs": {"images": ["862", 0]}},
+            "850": {
+                "class_type": "ComfySwitchNode",
+                "inputs": {
+                    "on_false": ["848", 0],
+                    "on_true": ["854", 0],
+                },
+            },
+            "851": {"class_type": "PreviewImage", "inputs": {"images": ["850", 0]}},
+        }
+
+        result = pt.prepare_delegate_master_prompt(prompt, ["854"])
+
+        self.assertIn("848", result)
+        self.assertEqual(result["850"]["inputs"]["on_false"], ["848", 0])
+        self.assertEqual(result["850"]["inputs"]["on_true"], ["854", 0])
+        self.assertNotIn("862", result)
+
+    def test_preserves_registered_string_utility_subgraph_for_downstream_required_input(self):
+        """Delegate-only master keeps scalar utility chains used by SaveImage."""
+        string_concat = type(
+            "StringConcatenate",
+            (),
+            {
+                "RETURN_TYPES": ("STRING",),
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "string_a": ("STRING",),
+                            "string_b": ("STRING",),
+                        }
+                    }
+                ),
+            },
+        )
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "SaveImage": save_image,
+            "StringConcatenate": string_concat,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "test"}},
+                "16": {"class_type": "PrimitiveString", "inputs": {"value": "input_bug3"}},
+                "17": {
+                    "class_type": "StringConcatenate",
+                    "inputs": {
+                        "string_a": ["15", 0],
+                        "string_b": ["16", 0],
+                    },
+                },
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["17", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertIn("15", result)
+        self.assertIn("16", result)
+        self.assertIn("17", result)
+        self.assertEqual(result["9"]["inputs"]["filename_prefix"], ["17", 0])
+        self.assertEqual(result["17"]["inputs"]["string_a"], ["15", 0])
+        self.assertEqual(result["17"]["inputs"]["string_b"], ["16", 0])
+
+    def test_preserves_registered_multi_string_join_subgraph_for_downstream_required_input(self):
+        """Delegate-only master keeps multi-input scalar utility chains."""
+        join_string_multi = type(
+            "JoinStringMulti",
+            (),
+            {
+                "RETURN_TYPES": ("STRING",),
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {"string_1": ("STRING",)},
+                        "optional": {
+                            "string_2": ("STRING",),
+                            "string_3": ("STRING",),
+                        },
+                    }
+                ),
+            },
+        )
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "JoinStringMulti": join_string_multi,
+            "SaveImage": save_image,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "test"}},
+                "16": {"class_type": "PrimitiveString", "inputs": {"value": "input"}},
+                "17": {"class_type": "PrimitiveString", "inputs": {"value": "bug4"}},
+                "18": {
+                    "class_type": "JoinStringMulti",
+                    "inputs": {
+                        "string_1": ["15", 0],
+                        "string_2": ["16", 0],
+                        "string_3": ["17", 0],
+                    },
+                },
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["18", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertIn("15", result)
+        self.assertIn("16", result)
+        self.assertIn("17", result)
+        self.assertIn("18", result)
+        self.assertEqual(result["9"]["inputs"]["filename_prefix"], ["18", 0])
+
+    def test_does_not_preserve_scalar_utility_with_heavy_upstream_dependency(self):
+        """Scalar utility nodes are retained only when their full input branch is safe."""
+        string_concat = type(
+            "StringConcatenate",
+            (),
+            {
+                "RETURN_TYPES": ("STRING",),
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "string_a": ("STRING",),
+                            "string_b": ("STRING",),
+                        }
+                    }
+                ),
+            },
+        )
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "SaveImage": save_image,
+            "StringConcatenate": string_concat,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "test"}},
+                "17": {
+                    "class_type": "StringConcatenate",
+                    "inputs": {
+                        "string_a": ["15", 0],
+                        "string_b": ["8", 0],
+                    },
+                },
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["17", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertNotIn("8", result)
+        self.assertNotIn("17", result)
+        self.assertNotIn("filename_prefix", result["9"]["inputs"])
+
+    def test_does_not_preserve_scalar_output_for_non_scalar_downstream_input(self):
+        """Scalar outputs are retained only for scalar/config downstream inputs."""
+        string_provider = type("StringProvider", (), {"RETURN_TYPES": ("STRING",)})
+        image_consumer = type(
+            "ImageConsumer",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "mask": ("IMAGE",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "ImageConsumer": image_consumer,
+            "StringProvider": string_provider,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "17": {"class_type": "StringProvider", "inputs": {}},
+                "9": {
+                    "class_type": "ImageConsumer",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "mask": ["17", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertNotIn("17", result)
+        self.assertNotIn("mask", result["9"]["inputs"])
+
+    def test_preserves_scalar_list_join_subgraph_for_downstream_required_input(self):
+        """Delegate-only master keeps list-shaped scalar config chains."""
+        create_list = type(
+            "CreateList",
+            (),
+            {
+                "RETURN_TYPES": ("LIST",),
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {"inputs.input0": ("STRING",)},
+                        "optional": {
+                            "inputs.input1": ("STRING",),
+                            "inputs.input2": ("STRING",),
+                        },
+                    }
+                ),
+            },
+        )
+        string_data_list_join = type(
+            "StringDataListJoin",
+            (),
+            {
+                "RETURN_TYPES": ("STRING",),
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "strings": ("LIST",),
+                            "delimiter": ("STRING",),
+                        }
+                    }
+                ),
+            },
+        )
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "CreateList": create_list,
+            "SaveImage": save_image,
+            "StringDataListJoin": string_data_list_join,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "test"}},
+                "17": {"class_type": "PrimitiveString", "inputs": {"value": "input_bug"}},
+                "29": {"class_type": "PrimitiveString", "inputs": {"value": "new"}},
+                "28": {
+                    "class_type": "CreateList",
+                    "inputs": {
+                        "inputs.input0": ["15", 0],
+                        "inputs.input1": ["17", 0],
+                        "inputs.input2": ["29", 0],
+                    },
+                },
+                "32": {
+                    "class_type": "StringDataListJoin",
+                    "inputs": {
+                        "strings": ["28", 0],
+                        "delimiter": "/",
+                    },
+                },
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["32", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        self.assertIn("15", result)
+        self.assertIn("17", result)
+        self.assertIn("28", result)
+        self.assertIn("29", result)
+        self.assertIn("32", result)
+        self.assertEqual(result["9"]["inputs"]["filename_prefix"], ["32", 0])
+        self.assertEqual(result["32"]["inputs"]["strings"], ["28", 0])
+        self.assertEqual(result["28"]["inputs"]["inputs.input0"], ["15", 0])
+        self.assertNotIn("8", result)
+
+    def test_preserves_builtin_create_list_string_data_list_join_subgraph(self):
+        """Delegate-only master handles ComfyUI 0.23 CreateList data-list output."""
+        string_data_list_join = type(
+            "StringDataListJoin",
+            (),
+            {
+                "RETURN_TYPES": ("STRING",),
+                "INPUT_IS_LIST": True,
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "strings": ("STRING", {"forceInput": True}),
+                            "sep": ("STRING", {"default": " "}),
+                        }
+                    }
+                ),
+            },
+        )
+        save_image = type(
+            "SaveImage",
+            (),
+            {
+                "INPUT_TYPES": classmethod(
+                    lambda cls: {
+                        "required": {
+                            "images": ("IMAGE",),
+                            "filename_prefix": ("STRING",),
+                        }
+                    }
+                )
+            },
+        )
+        previous_mappings = getattr(pt, "_DELEGATE_MASTER_NODE_CLASS_MAPPINGS", None)
+        pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = {
+            "Basic data handling: StringDataListJoin": string_data_list_join,
+            "SaveImage": save_image,
+        }
+        try:
+            prompt = {
+                "8": {"class_type": "KSampler", "inputs": {}},
+                "11": {"class_type": "DistributedCollector", "inputs": {"images": ["8", 0]}},
+                "15": {"class_type": "PrimitiveString", "inputs": {"value": "input_bug"}},
+                "17": {"class_type": "PrimitiveString", "inputs": {"value": "test"}},
+                "29": {"class_type": "PrimitiveString", "inputs": {"value": "new"}},
+                "28": {
+                    "class_type": "CreateList",
+                    "inputs": {
+                        "inputs.input0": ["17", 0],
+                        "inputs.input1": ["15", 0],
+                        "inputs.input2": ["29", 0],
+                    },
+                },
+                "32": {
+                    "class_type": "Basic data handling: StringDataListJoin",
+                    "inputs": {
+                        "strings": ["28", 0],
+                        "sep": "/",
+                    },
+                },
+                "9": {
+                    "class_type": "SaveImage",
+                    "inputs": {
+                        "images": ["11", 0],
+                        "filename_prefix": ["32", 0],
+                    },
+                },
+            }
+
+            result = pt.prepare_delegate_master_prompt(prompt, ["11"])
+        finally:
+            pt._DELEGATE_MASTER_NODE_CLASS_MAPPINGS = previous_mappings
+
+        for node_id in ("15", "17", "28", "29", "32"):
+            self.assertIn(node_id, result)
+        self.assertEqual(result["9"]["inputs"]["filename_prefix"], ["32", 0])
+        self.assertEqual(result["32"]["inputs"]["strings"], ["28", 0])
+        self.assertEqual(result["28"]["inputs"]["inputs.input0"], ["17", 0])
+        self.assertNotIn("8", result)
+
     def test_result_is_independent_copy(self):
         prompt = _delegate_prompt()
         result = pt.prepare_delegate_master_prompt(prompt, ["3"])

tests/test_v3_migration.py

@@ -0,0 +1,21 @@
+"""Real-framework acceptance; opt in with COMFYUI_SOURCE_ROOT."""
+import os
+from pathlib import Path
+import subprocess
+import sys
+
+import pytest
+
+
+def test_native_v3_runtime():
+    comfy_root = os.environ.get('COMFYUI_SOURCE_ROOT')
+    if not comfy_root:
+        pytest.skip('Set COMFYUI_SOURCE_ROOT to run native ComfyUI V3 acceptance')
+    helper = Path(__file__).parent / 'helpers' / 'v3_runtime_check.py'
+    result = subprocess.run(
+        [sys.executable, str(helper), str(Path(comfy_root).resolve())],
+        capture_output=True, text=True, timeout=120,
+        env={**os.environ, 'COMFYUI_IS_WORKER': '1'},
+    )
+    assert result.returncode == 0, result.stdout + '\n' + result.stderr
+    assert 'V3_ACCEPTANCE_OK' in result.stdout

web/distributedValue.js

@@ -2,7 +2,6 @@ import { app } from "/scripts/app.js";
 import { ENDPOINTS } from "./constants.js";
 
 const NODE_CLASS = "DistributedValue";
-const CONVERTED_WIDGET = "converted-widget";
 const DYNAMIC_DEFAULT_WIDGET = "_dv_default";
 const DYNAMIC_WORKER_WIDGET_PREFIX = "_dv_worker_";
 const WORKERS_CHANGED_EVENT = "distributed:workers-changed";
@@ -42,15 +41,13 @@ function getDynamicWorkerWidgets(node) {
     return (node.widgets || []).filter((w) => w.name.startsWith(DYNAMIC_WORKER_WIDGET_PREFIX));
 }
 
-function hideWidgetForGood(node, widget, suffix = "") {
+function hideWidgetForGood(widget) {
     if (!widget) return;
-    if (typeof widget.type === "string" && widget.type.startsWith(CONVERTED_WIDGET)) return;
-
-    widget.origType = widget.type;
-    widget.origComputeSize = widget.computeSize;
-    widget.origSerializeValue = widget.serializeValue;
-    widget.computeSize = () => [0, -4];
-    widget.type = `${CONVERTED_WIDGET}${suffix}`;
+    // These are serialized backing fields, not widgets converted into sockets.
+    // Keep their native type/serializer and mutate the shared options in place
+    // so both the classic canvas and Nodes 2.0 suppress the whole widget row.
+    widget.options ??= {};
+    widget.options.hidden = true;
 
     // Hide any attached DOM element (multiline widgets).
     if (widget.element) widget.element.style.display = "none";
@@ -58,14 +55,14 @@ function hideWidgetForGood(node, widget, suffix = "") {
 
     if (widget.linkedWidgets) {
         for (const linked of widget.linkedWidgets) {
-            hideWidgetForGood(node, linked, `:${widget.name}`);
+            hideWidgetForGood(linked);
         }
     }
 }
 
 function hideRawWidgets(node) {
-    hideWidgetForGood(node, getRawDefaultWidget(node), ":default_value");
-    hideWidgetForGood(node, getRawWorkerValuesWidget(node), ":worker_values");
+    hideWidgetForGood(getRawDefaultWidget(node));
+    hideWidgetForGood(getRawWorkerValuesWidget(node));
 }
 
 function removeDynamicDefaultWidget(node) {

web/sidebar/settingsSection.js

@@ -72,7 +72,7 @@ export function renderSettingsSection(extension) {
         createCheckboxSetting(
             "setting-debug",
             "Debug Mode",
-            "Enable verbose logging in the browser console.",
+            "Enable verbose logging in the browser console and ComfyUI server output.",
             extension.config?.settings?.debug || false,
             (event) => extension._updateSetting("debug", event.target.checked)
         )
@@ -100,7 +100,7 @@ export function renderSettingsSection(extension) {
         createNumberSetting(
             "setting-worker-timeout",
             "Worker Timeout",
-            "Seconds without a heartbeat before a worker is considered timed out. Default 60.",
+            "Maximum result-wait and heartbeat inactivity period before recovery begins. Busy workers may receive additional grace. Default: 60 seconds.",
             extension.config?.settings?.worker_timeout_seconds ?? 60,
             10,
             1,

web/tests/distributedValue.test.js

@@ -0,0 +1,120 @@
+import { readFileSync } from "node:fs";
+import vm from "node:vm";
+import { describe, expect, it, vi } from "vitest";
+
+// Evaluate this repository's browser entrypoint without needing a ComfyUI server.
+// The real-renderer acceptance additionally checks the input rows in Chromium.
+const source = readFileSync(new URL("../distributedValue.js", import.meta.url), "utf8")
+    .replace(/^import .*;\r?\n/gm, "");
+
+function setup({ connected = false, targetType = "STRING" } = {}) {
+    let extension;
+    const listeners = new Map();
+    const tasks = [];
+    const workers = [
+        { id: "gpu-a", name: "GPU A", enabled: true },
+        { id: "gpu-b", name: "GPU B", enabled: true },
+        { id: "off", name: "Disabled", enabled: false },
+    ];
+    const target = {
+        inputs: [{ name: "value" }],
+        widgets: [{ name: "value", type: targetType === "INT" ? "number" : "string", options: { step: 1, precision: 0 } }],
+    };
+    const graph = { links: { 1: { target_id: 2, target_slot: 0 } }, getNodeById: () => target };
+    const raw = ["default_value", "worker_values"].map((name, index) => ({
+        name,
+        type: "text",
+        value: index === 0 ? "saved default" : '{"1":"saved worker"}',
+        options: { multiline: false },
+        computeSize: vi.fn(() => [200, 20]),
+        serializeValue: vi.fn(function () { return this.value; }),
+    }));
+    const node = {
+        comfyClass: "DistributedValue", graph, widgets: [...raw], size: [200, 100],
+        inputs: raw.map(w => ({ name: w.name, widget: { name: w.name }, link: null })),
+        outputs: [{ links: connected ? [1] : [] }],
+        computeSize: () => [200, 100], setSize: vi.fn(), setDirtyCanvas: vi.fn(),
+        addWidget(type, name, value, callback, options) {
+            const widget = { type, name, value, callback, options };
+            this.widgets.push(widget);
+            return widget;
+        },
+        configure(data) {
+            data.widgets_values.forEach((value, i) => { this.widgets[i].value = value; });
+            return "configured";
+        },
+    };
+    vm.runInNewContext(source, {
+        app: { graph, registerExtension: ext => { extension = ext; } },
+        ENDPOINTS: { CONFIG: "/distributed/config" },
+        fetch: async () => ({ ok: true, json: async () => ({ workers }) }),
+        window: { addEventListener: (name, handler) => listeners.set(name, handler) },
+        setTimeout: callback => { tasks.push(callback); }, console,
+    }, { filename: "distributedValue.js" });
+    return { node, raw, extension, listeners, tasks, flush: () => { while (tasks.length) tasks.shift()(); } };
+}
+
+describe("Distributed Value internal widget visibility", () => {
+    it("hides raw fields natively without converting their types or replacing their options", async () => {
+        const h = setup();
+        const options = h.raw.map(w => w.options);
+        const sizes = h.raw.map(w => w.computeSize);
+        const serializers = h.raw.map(w => w.serializeValue);
+        const slots = h.node.inputs;
+        await h.extension.nodeCreated(h.node);
+
+        for (const [i, widget] of h.raw.entries()) {
+            expect(widget.type).toBe("text");
+            expect(widget.options).toBe(options[i]);
+            expect(widget.options.hidden).toBe(true);
+            expect(widget.computeSize).toBe(sizes[i]);
+            expect(widget.serializeValue).toBe(serializers[i]);
+            expect(h.node.widgets[i]).toBe(widget);
+        }
+        expect(h.node.inputs).toBe(slots);
+        expect(h.node.widgets.slice(2).map(w => w.label)).toEqual(["default_value", "GPU A", "GPU B"]);
+        expect(h.node.widgets.slice(2).every(w => !w.options.hidden)).toBe(true);
+    });
+
+    it("keeps typed edits in the original serialized fields across rebuild/configure", async () => {
+        const h = setup({ connected: true, targetType: "INT" });
+        await h.extension.nodeCreated(h.node);
+        h.node.widgets.find(w => w.name === "_dv_default").callback(42);
+        h.node.widgets.find(w => w.name === "_dv_worker_1").callback(7);
+        h.node.widgets.find(w => w.name === "_dv_worker_2").callback(9);
+        const values = h.raw.map(w => w.serializeValue());
+        expect(values[0]).toBe(42);
+        expect(JSON.parse(values[1])).toMatchObject({
+            _type: "INT", 1: "7", 2: "9", _by_worker_id: { "gpu-a": "7", "gpu-b": "9" },
+        });
+        expect(h.node.configure({ widgets_values: values })).toBe("configured");
+        h.flush();
+        expect(h.raw.map(w => w.serializeValue())).toEqual(values);
+        expect(h.raw.every(w => w.options.hidden && w.type === "text")).toBe(true);
+        expect(h.node.widgets.slice(2).map(w => w.value)).toEqual([42, 7, 9]);
+    });
+
+    it("reapplies visibility on worker refresh without duplicating raw or dynamic fields", async () => {
+        const h = setup();
+        await h.extension.nodeCreated(h.node);
+        h.raw[0].options.hidden = false;
+        await h.listeners.get("distributed:workers-changed")({ detail: { workers: [
+            { id: "gpu-b", name: "Renamed B", enabled: true },
+        ] } });
+        expect(h.raw.every(w => w.options.hidden)).toBe(true);
+        expect(h.node.widgets.map(w => w.name)).toEqual(["default_value", "worker_values", "_dv_default", "_dv_worker_1"]);
+        expect(h.node.widgets[3].label).toBe("Renamed B");
+    });
+
+    it("hides linked backing widgets and handles absent options without altering serializers", async () => {
+        const h = setup();
+        delete h.raw[1].options;
+        const linked = { type: "text", options: {}, serializeValue: vi.fn(() => "linked") };
+        h.raw[0].linkedWidgets = [linked];
+        await h.extension.nodeCreated(h.node);
+        expect(h.raw[1].options.hidden).toBe(true);
+        expect(linked.options.hidden).toBe(true);
+        expect(linked.type).toBe("text");
+        expect(linked.serializeValue()).toBe("linked");
+    });
+});

workflows/distributed-upscale.json

@@ -814,7 +814,7 @@
       "outputs": [],
       "properties": {},
       "widgets_values": [
-        "If all your GPUs are the same/similar, set static_distribution to true\n"
+        "Workers pull tiles from a shared queue, so faster workers can process more tiles automatically.\n"
       ],
       "color": "#432",
       "bgcolor": "#653"