arkennemasis Nodes

arkennemasis — ComfyUI Nodes

One pack, one menu (arkennemasis), many AI use cases. 75 nodes today:

| Category | | | |---|---|---| | Variation | 35 | a client's spreadsheet plus one photo → a verified, consistently-framed product image library | | Utility | 17 | web capture, masks, compositing, boards, captions, image and text helpers | | Video | 10 | per-shot generation, dubbing, measured captions, narration-fitted assembly | | Avatar | 6 | find a story, write it, speak it, and put a presenter in front of it | | Image Gen · LLM · Audio | 7 | gpt-image-2, GPT-5 text + vision, local TTS |

Providers and use cases keep growing — each module loads independently, so nothing breaks anything else. And if you already pay for ChatGPT, none of the image or text nodes need an API key.

---

What you can build

| You want | The pack gives you | |---|---| | A talking-head news video, every morning, by itself | It finds a story, writes it, speaks it, animates a presenter, cuts them out and stands them in front of a screenshot of the article. It remembers what it already covered. | | A narrated film from one brief | Write the idea once. It plans the scenes, renders each one, makes every shot last as long as its voice-over, then joins them with music and subtitles. | | A product photo library from a spreadsheet | One photo of the product plus a list of colours or finishes in, a full set of images out — same object every time, only the named part changing. | | A training dataset for a character LoRA | One photo in, 24 shots out, each with its caption file. Ready-made workflow included. | | The same picture, many versions | Different hair, different language, different pose. You supply the list of variants; the pack runs them and puts every result on one board to compare. |

You bring the words, the pack brings the machine. Nothing here tells a model what to write — the prompts are yours. These nodes handle the parts that are the same every time: looping, retrying, staying in budget, keeping the shape, timing captions to speech, writing files where you expect them.

It won't quietly spend your money. You can run 3 of 30 branches and the other 27 never execute, so a paid node upstream is never called. Every run gets its own folder and a log.

---

⭐ Generate images with your ChatGPT subscription — no API key

If you already pay for ChatGPT, you can generate gpt-image-2 images in ComfyUI without buying any API credit. Install the pack, run codex login once in a terminal, and the Codex Image Gen node signs in with your existing ChatGPT account. Images bill against your plan instead of per call.

ChatGPT Plus at $20/month is enough and is what this pack is developed against.

codex login      # once, in your own terminal — not inside ComfyUI

There is no API key field and no OAuth flow in ComfyUI — the node reads the Codex CLI's own login. Drop in Codex Login Status to confirm the account and plan before you run anything. Full details in What each path needs.

🎬 Ready-made workflow: character LoRA training dataset

example workflows/ ships a complete Character Dataset (GPT-Image-2) - Codex workflow: drop in one photo of a person and it produces a 25-image LoRA training dataset — 24 generated shots plus the real reference tile, each with a matching caption .txt, in an auto-numbered folder. Ready to feed straight into LoRA training.

All 24 shots are distinct looks — street candid, studio campaign, black-and-white editorial, festive ethnic wear, automotive, poolside, snow and more — with 24 different outfits, so the model learns the person rather than the clothes or the room. No GPU needed; every generation is an API call.

---

Nodes

| Menu | Node | What it does | Out | |---|---|---|---| | arkennemasis/LLM | arkennemasis Replicate LLM (OpenAI GPT-5) | GPT-5 family (gpt-5, -mini, -nano, -pro, -structured, 5.1, 5.2, 5.4, 5.6-luna/terra/sol) — text + vision (4 image inputs) | STRING | | arkennemasis/LLM | arkennemasis Codex LLM (ChatGPT login) | GPT-5 text and vision through your codex login — no API key, billed to your ChatGPT plan. Reads images, and splits a long answer into batches so a 50-scene plan does not have to arrive in one reply | STRING, STRING | | arkennemasis/Image Gen | arkennemasis Replicate Image Gen (GPT-Image-2) | openai/gpt-image-2 — text→image and image edit (4 image inputs) | IMAGE | | arkennemasis/Image Gen | arkennemasis Image Gen Settings (shared) | one node driving aspect_ratio / quality / run_mode / background / output_format / moderation / timeout_seconds / api_token on many Image Gen nodes at once | ARK_IMAGE_SETTINGS | | arkennemasis/Image Gen | arkennemasis Codex Image Gen (ChatGPT login) | gpt-image-2 through your codex login — no API key, billed to your ChatGPT plan | IMAGE, STRING | | arkennemasis/Utility | arkennemasis Codex Login Status | which ChatGPT account this machine will use, and when its token expires | STRING | | arkennemasis/Utility | arkennemasis System Instructions | reusable system prompt for any LLM node | STRING | | arkennemasis/Utility | arkennemasis Shot Selector (run N of M) | run only N of M expensive branches — the first N in order, or a random sample from a seed. Unselected branches never execute, so a paid API node upstream is never called | IMAGE | | arkennemasis/Utility | arkennemasis Subject Line (gender + notes) | one Subject: … line from a gender choice plus free-text notes, wired into every prompt — so the prompts themselves stay gender-neutral and the subject is stated once | STRING | | arkennemasis/Utility | arkennemasis Text File Save (caption sidecar) | writes <folder>/<filename>.txt next to a saved image — the image/caption pairing training toolkits expect | STRING | | arkennemasis/Utility | arkennemasis Run Folder (auto-numbered) | <parent_dir>/<folder_name>_001, _002, … — one fresh output folder per run | STRING, INT | | arkennemasis/Utility | arkennemasis Story Brief / Run Log / Contact Sheet | the brief form, a JSON run log that needs no spreadsheet, and every still of a run on one sheet | STRING, IMAGE | | arkennemasis/Video | arkennemasis Scene List (the loop) | fans a scene plan out so one chain runs once per scene — 5 or 50, same canvas | lists | | arkennemasis/Video | arkennemasis Hailuo Scene | one scene start to finish: condition → sample → decode video and audio → mux → save → free | VIDEO | | arkennemasis/Audio | arkennemasis Qwen3-TTS (voice clone) | local Qwen3-TTS. Text in, speech out; give it 5–30 s of someone speaking and it clones that voice. Runs in a subprocess — see below | AUDIO, STRING | | arkennemasis/Video | arkennemasis Video Dub (narration over a clip) | swaps a clip's own soundtrack for a narration track, per clip. MiniMax H3 always generates audio and cannot be asked for silence, so the voice has to replace it | VIDEO, STRING | | arkennemasis/Video | arkennemasis Narration Length (fit the shot to the voice) | measures a rendered narration and returns the shot length that covers it, snapped to H3's frame grid. Wire between the TTS node and the scene node and every shot outlasts its own voice-over | INT, FLOAT, STRING | | arkennemasis/Video | arkennemasis Caption Style (font + subtitle style) | one of five subtitle styles, any installed font, colours, outline, box, size, 3×3 position — and an on/off switch | ARK_CAPTION_STYLE | | arkennemasis/Video | arkennemasis Video Assemble (clips + music + subs) | joins every clip, levels each one's speech, ducks a music bed, burns the captions | STRING, VIDEO | | arkennemasis/Video | arkennemasis Load Clips (finished clips from disk) | reads a run's finished clips back as a VIDEO list — join a film whose render was interrupted, without re-rendering | VIDEO list | | arkennemasis/Video | arkennemasis Scene Split / Scene At | pull one scene out of a JSON plan — by parsing it, or by index | STRING | | arkennemasis/Video | arkennemasis Word Timings | transcribes the finished narration and returns when each word is actually spoken. Moving caption styles need real times; guessing from word count drifts | STRING | | arkennemasis/Video | arkennemasis Video Model / Video Save | pick one video model without both loading, and write a clip then free the weights | MODEL, VIDEO | | arkennemasis/Utility | arkennemasis Web Shot (page → picture, text, links) | drives a local Chrome and gives you a screenshot, the readable text, and the links. Free, and it can scroll to a selector first | IMAGE, STRING | | arkennemasis/Utility | arkennemasis ScreenshotOne | the hosted version of the same job, with ads and cookie banners blocked. Some sites photograph as a consent dialog through a plain browser and correctly through this | IMAGE, STRING | | arkennemasis/Utility | arkennemasis Mask Refine | turns a per-frame segmentation mask into one you can composite through — a segmenter is right frame by frame and jittery as a video | MASK | | arkennemasis/Utility | arkennemasis Overlay Subject | stands a cut-out subject on a background at a chosen size and position. The part a hosted avatar service does for you and never lets you adjust | IMAGE | | arkennemasis/Utility | arkennemasis Match Aspect | measures the image being edited and pins the generator's output to that shape. Without it an "auto" setting says nothing about shape and the model reframes your picture | ARK_IMAGE_SETTINGS | | arkennemasis/Utility | arkennemasis Option Board | collects a fanned-out run onto one labelled .excalidraw board plus a preview — how you judge a set rather than a picture | STRING, IMAGE | | arkennemasis/Utility | arkennemasis Purge VRAM | unloads models between stages, so a big image model and a big video model can share one canvas | passthrough |

arkennemasis/Avatar — a story in, a presenter telling it out

Six nodes that turn "cover today's news about X" into a captioned vertical video, with no one watching. They compose with the Video and Utility nodes above rather than replacing them.

| Node | What it does | |---|---| | Avatar Brief | one labelled box per thing you actually decide: the beat, the sources, the voice, the length | | Story Pick | reads the model's choice back out and checks it — a real article, from the list it was shown, not one it invented | | Story History | what has already been covered, so tomorrow picks something else | | Story Record | writes today's story into that history — only once a video file exists. A run that produced nothing covered nothing | | Avatar Script | splits one answer into the spoken script, the caption and the headline | | Avatar Frames | how long the clip must be, measured from the voice that will play over it |

arkennemasis/Variation — the product-variation pipeline

A client's variation spreadsheet plus one locked base photograph in; a verified, consistently framed image library out. Any product, any number of variation axes. The guarantee is not "good images" — it is that every delivered image shows the same physical object, differing only in the specified attribute.

35 nodes, described here as a pipeline rather than one by one — they are stages of a single machine and are wired for you by the workflow, not picked individually off a menu. There are two paths: the ten-stage pipeline below, for when a client hands you a messy sheet and the prompts still have to be worked out, and a shorter CSV catalogue path (Catalogue Load / Fan-Out / Save / Board) for when the prompts already exist and one row means one image.

Choose the short one only when the answers are already written. It gives up the measurement, the bounded retry, the durable job records, the drift audit and the human gate — which are the ten-stage version's whole reason to exist.

The prompts are not in this repo. The compiler brief, the two locks and the critic's rubric live in variation/prompts_local.py, which is git-ignored. The nodes work without it; the prompt boxes just come up empty, and the wording is yours to write. A saved workflow carries its own copy, so a graph someone shares with you runs as-is.

A colour's specification format is a property of the VALUE, not the axis. Four are supported and a real client sheet mixes them inside a single axis:

| Format | spec_type | Reference sent? | Colour auto-checked? | |---|---|---|---| | hex only | hex | no — a flat swatch would ask for a flat fill | yes | | hex + description | hex | no | yes | | reference image | reference_image | yes | no — there is no target | | reference image + hex | reference_image | yes | yes |

A bare word with neither is rejected: a word is a request for an opinion, and the model gives a different opinion every time it is asked. ref_url accepts an http(s) URL, a file:// URL, or a bare local path.

Nothing in variation/ knows what a product is. No region names, no axis names, no counts, no filename patterns: all of those arrive from the recipe or the intake mapping, and the cell generator is a cartesian product over however many axes the recipe declares.

| Node | What it does | Out | |---|---|---| | Sheet Probe | reads any client sheet (CSV/TSV/JSON) without interpreting it, and proposes a column mapping | STRING | | Variation Intake | normalises whatever arrived into VARIANTS / SPECS / PRODUCT and runs every pre-generation validation. Fails loudly rather than guessing — a guessed material makes a plausible image that is wrong | STRING, BOOLEAN, INT | | Spec Library | downloads, caches and content-hashes every reference; renders a swatch per hex. Per client, accumulates across products | STRING, IMAGE | | Plate Lock | freezes one base photo and measures it: hash, dimensions, colour profile, per-region boxes, proportion ratios. After this it is never regenerated | IMAGE, MASK, STRING | | Region Mask | pulls one named region's mask back out of the locked plate, resolving the cell's own target region by itself | MASK, STRING, BOOLEAN | | Recipe Brief | the fixed, product-neutral Tier 0 meta-prompt — it discovers regions by looking at the photograph | STRING | | Recipe Compile | validates the model's JSON, merges the library, and injects both locks and the tolerances as constants — anything the model wrote there is discarded | STRING, BOOLEAN | | Recipe Gate | the one human checkpoint. Blocks everything downstream until a name is typed. Guards the paints field, which is where a wrong answer wastes a whole run | STRING | | Cell Matrix / Cell At | the cartesian product of N axes × plates, then one cell by index. Two nested loops over exactly two axes is a defect, not a simplification | STRING, IMAGE, INT | | Prompt Build | assembles one prompt by pure substitution — change instruction, then invariants, then both locks, the last three byte-identical across the run. Never calls a model | STRING | | Prompt Audit | proves every prompt in the run shared one constant block, and fails if not. Prompt variance is the mechanism by which a set drifts | BOOLEAN, INT | | Gen Route | picks the deterministic or the generative path per axis. Both inputs lazy, so the branch not taken is never evaluated — no API call at all | IMAGE, STRING | | Region Recolour | retints a masked region to an exact hex in CIELAB while keeping the plate's own shading. Free, instant, and cannot drift by construction | IMAGE, INT | | Verify Candidate | measures product identity, frame match, colour ΔE2000, bleed and hygiene, then returns pass / soft / hard. The step that used to live in the operator's head | STRING, BOOLEAN, FLOAT | | Calibrate | derives tolerances from a real labelled set instead of guesswork, and reports the operator's true current pass rate. No generation spend | STRING, FLOAT | | Job Skip / Job Record / Run Report | durable per-cell records on disk. Job Skip's generate branch is lazy, so a finished cell is never re-generated and never re-billed | IMAGE, STRING, FLOAT | | Deliver | the format ladder (PNG / white-background JPG / WebP / thumb) filed one directory level per axis. Overwrites in place — no _v2, no timestamps | STRING | | Review Board | an HTML contact sheet whose approve/reject buttons write straight into the job records, plus an .excalidraw matrix for the client | STRING | | Store Export | the variation CSV with meta:attribute_pa_{axis} columns and each row's image — what turns a folder of images into "the variations are live" | STRING, INT |

Full instructions, the measured behaviour, and the five verification lessons that cost real debugging: claude/workflow-runbooks/variation-pipeline/RUNBOOK.md in the portable install.

Qwen3-TTS — why it needs a one-off setup

Qwen3-TTS runs in a subprocess, and that is deliberate. It is written against transformers==4.57.3; a normal ComfyUI install is on 5.x, and a dozen other node packs depend on that. Every published wrapper for this model tells you to downgrade — don't. The pin is also self-contradictory: qwen-tts 0.1.1 hardcodes 4.57.3 while its own tokenizer imports check_model_inputs, which only exists in 5.x.

So the node keeps a private dependency tree in vendor/tts_env and puts it first on sys.path in a child process — same interpreter, same torch, same CUDA, only the one conflicting package differs, and only there. vendor/ is not committed (114 MB, and redistributing someone else's package is a deliberate decision, not a git add .), so a fresh clone has to create it once. The command is in common/qwen_tts_node.py's docstring.

Models go in ComfyUI/models/qwen-tts/<model folder>. A Base model is clone-only — it has no preset voices, so reference_audio must be connected or the node stops immediately and says so. For preset voices, use a CustomVoice model.

Generation is retried up to three times with fresh seeds: the model occasionally never emits end-of-speech and generates until something stops it, which is a property of the sampled path, so re-running the same seed reproduces it exactly. The node also rejects a result far longer than the text can account for. It refuses to fall back to CPU — that still produces correct audio, roughly 40× slower, which reads exactly like a hang.

Captions

Caption Style feeds Video Assemble. Five styles:

| Style | On screen | |---|---| | classic | the whole line at once | | karaoke | the fill sweeps across the line as it is spoken | | highlight | the spoken word changes colour | | underline | the spoken word is underlined | | word_by_word | one word at a time, nothing else |

Everything but classic marks individual words, so it needs to know when each word is spoken. A video model gives no word timestamps, so they are estimated from the script and the clip's real duration, weighted by word length and by trailing punctuation. That tracks speech closely; it is not frame-accurate, and it drifts if the model ad-libs.

Fonts come from fonts/ (bundled, listed first) and from the machine's own installed fonts. See that folder's README for what ships and how to add more.

Toggle enabled off on the node for a video with no subtitles at all — every other setting stays put.

Install

cd ComfyUI/custom_nodes
git clone https://github.com/Hishamahmer/comfyui-arkennemasis

Install the dependencies, then restart ComfyUI:

# portable build:
python_embeded\python.exe -m pip install -r ComfyUI\custom_nodes\comfyui-arkennemasis\requirements.txt
# normal install:
pip install replicate httpx

Or in ComfyUI-Manager → Install via Git URL → paste the repo URL (deps auto-install).

What each path needs

The two image-generation paths reach the same gpt-image-2 model. Pick whichever you already pay for — you do not need both.

| Path | Nodes | What it requires | |---|---|---| | Replicate | Replicate LLM, Replicate Image Gen | A Replicate account and an API key. Pay-as-you-go per image. | | Codex / ChatGPT | Codex Image Gen, Codex Login Status | A paid ChatGPT subscription and the Codex CLI already logged in on this machine. No API key. Images bill against your ChatGPT plan instead of per call. |

Codex path — read this before you try it

1. A paid ChatGPT plan is required. The free tier cannot call the hosted image tool. ChatGPT Plus at $20/month is the recommended plan and is what this pack is developed against. Business/Pro plans work too.
2. Install the Codex CLI and sign in from your own terminal, on the same machine and the same user account that runs ComfyUI:

   codex login
   

   This writes ~/.codex/auth.json. The nodes read that file directly — there is no OAuth flow inside ComfyUI and nowhere to paste a password. If you have not run codex login, the Codex nodes will tell you so and stop.
3. Check it worked by dropping in the Codex Login Status node — it reports the signed-in account, the plan and when the token expires.

Availability is account-dependent: not every ChatGPT plan or region can call the hosted image tool. The node says so plainly rather than failing cryptically.

Running several ChatGPT accounts? Give each its own CODEX_HOME folder and set the node's codex_home per node. The Codex Image Gen node's account output names the signed-in email, so you can see which login produced an image.

API keys — three ways (pasting is optional)

Keys are read in this order: node field → OS env var → .env file.

1. Paste into a node's api_token field, or
2. Env var: set REPLICATE_API_TOKEN, or
3. .env file containing:

   REPLICATE_API_TOKEN=r8_your_token_here
   

.env is looked for in this folder and in ComfyUI's working directory (its root). Prefer the ComfyUI root — keeping the key outside the repo means re-cloning or updating the pack never touches it, and no secret ever sits in a git working tree. .env is gitignored either way; .env.example is the template.

Get a Replicate token at https://replicate.com/account/api-tokens.

Usage

Typical LLM → image flow:

System Instructions ─► Replicate LLM (system_prompt)
Text  ───────────────► Replicate LLM (prompt)
Image(s) ────────────► Replicate LLM (image_1..4)   ← vision
                            │ text
                            ▼
                 Replicate Image Gen (prompt)  ◄─ image_1..4 (edit/reference)
                            │
                        Save Image

Optional params (quality, aspect_ratio, reasoning_effort, …) left on default are not sent, so the model's own defaults apply. timeout_seconds = 0 waits indefinitely.

Driving many Image Gen nodes from one place

ComfyUI rejects a STRING link into a COMBO widget, so a shared aspect_ratio or quality cannot be wired straight into the widgets. Image Gen Settings bundles them into one typed value instead — wire its output into each node's optional settings socket:

Image Gen Settings ─┬─► Image Gen #1 (settings)
                    ├─► Image Gen #2 (settings)
                    └─► … 24 more

Any field left on use node's own (-1 for timeout_seconds, blank for api_token) falls through to that node's own widget, so you can share most settings and still override one node locally.

settings is a socket, not a widget, so adding it did not shift any existing widgets_values index.

number_of_images is deliberately not shared. Multiplying it across every wired node is rarely what you want, and in a graph that names files deterministically the extra images all land on the same filename and overwrite each other. Set it per node if you need it.

Rate limits and concurrency

ComfyUI runs async def nodes concurrently, so several API nodes in one graph create their predictions in the same millisecond. Replicate drops to "6 requests per minute with a burst of 1" while an account holds under $5 credit, so parallel calls reliably return 429.

Both API nodes therefore have a run_mode widget:

| run_mode | Behaviour | |---|---| | one at a time (default) | an asyncio lock serialises every arkennemasis API node in the graph | | all at once | the original concurrent behaviour — faster when your rate limit allows it |

max_concurrent sets how many calls all at once may actually have in flight (default 2, 0 = uncapped).

Retries — what is retried, and what is not

A node exception aborts the whole ComfyUI prompt, so on a 24-image batch one bad minute of network throws away every shot still queued. common/throttle.with_retry therefore retries anything that got no complete answer:

| Retried | Not retried | |---|---| | 429 — backs off exponentially, honouring Retry-After or the "resets in ~Ns" hint | a moderation refusal | | 500 / 502 / 503 / 504 | a malformed request (400) | | a dropped or truncated connection (RemoteProtocolError, read timeouts, "incomplete chunked read") | an expired or wrong login (401 / 403) | | an SSE stream that ends with no completion event | an account without the image tool |

Dropped connections retry after a couple of seconds — waiting a minute does not make a socket healthier. Rate limits keep the long backoff. Six attempts, then the original error is raised.

The Codex node also tells a finished image apart from a partial_images preview, so a stream cut short mid-render can never be saved as if it were the final result.

Running only some of many expensive branches

Shot Selector sits between each generator and its consumers. Give every copy the same how_many / seed / total_shots / selection and a unique shot_index; each copy derives the same chosen set independently, so no extra wiring is needed.

selection picks how the set is chosen:

| Mode | Behaviour | Use it when | |---|---|---| | first N in order (default) | runs slots 1..N | the first branches are the ones you are iterating on — how_many = 5 runs the first five, no seed needed | | random from seed | an unbiased sample of the whole set | you want a representative spread across every branch without paying for all of them |

seed only matters in random from seed.

image is a lazy input, so an unselected branch is never evaluated — the API node upstream is never called, and never billed. Unselected returns ExecutionBlocker(None), which silently skips everything downstream.

Caveat: ComfyUI blocks any node that has a blocked input, so a partial run also skips nodes that gather every branch (collect/unpack pairs). Give each branch its own save if you want partial runs to produce output.

One output folder per run

Run Folder resolves <parent_dir>/<folder_name>_<NNN> for the current run, picking the next free number (it scans existing siblings, so a manual _009 yields _010). Wire folder_path into every save node so a run's outputs land together and nothing is overwritten.

It exists because save nodes that support time tokens evaluate them at save time — a graph writing 24 images over an hour would scatter them across several [time(%H-%M)] folders. IS_CHANGED returns NaN so the path is recomputed each queued run rather than served from cache; only the saves re-execute, so re-running does not re-bill an upstream API node.

Image generation with a ChatGPT login (no API key)

Codex Image Gen reuses the OAuth credentials the Codex CLI already wrote — the very same login, not a copy:

codex login          # once, in a terminal; opens the browser

It reads $CODEX_HOME/auth.json, else ~/.codex/auth.json. No OAuth flow is implemented in ComfyUI — logging in stays the CLI's job. codex logout and the node stops working; log in as someone else and the node follows.

Multiple accounts: give each its own folder and point codex_home at the one you want. Different nodes can use different accounts in the same graph.

$env:CODEX_HOME = "C:\CodexAccounts\work"
codex login

The node's account output and its console line both name the signed-in email, so you can always see which account produced an image. Codex Login Status reports it without generating anything.

Token handling: an expired access token is refreshed against https://auth.openai.com/oauth/token and saved back atomically, preserving every other key in the file. That write matters — the endpoint may return a rotated refresh token, and dropping it would break the login on the next rotation. Set allow_refresh off to fail instead of ever writing.

Availability is account-dependent: not every ChatGPT plan can call the hosted image tool. If yours cannot, the node says so plainly instead of dumping an HTTP error.

Caption sidecars

Text File Save writes <folder_path>/<filename>.<extension>. Give it the same folder and filename stem the image save uses and you get the pairing kohya / ai-toolkit / diffusers expect:

shot_001.png
shot_001.txt

Wire the generating image into images: it binds the caption to that branch, so a branch skipped by a gate writes no orphan .txt.

Caption rule for character LoRAs: anything you caption is excluded from what the LoRA learns. Caption the variable parts — pose, expression, wardrobe, background — and never the face, hair colour or eye colour. This is why feeding it a VLM description of the finished image is usually wrong: a VLM writes exactly the identity features you must not caption.

Notes

• Replicate calls are paid — each run bills your Replicate account.
• Long runs poll (no fixed timeout) and run off the UI thread, so ComfyUI stays responsive and Cancel works. A spinner + elapsed-time badge shows on the node while it runs.
• GPT-5 models output text only; image generation is done by the Image Gen node.

Example workflows

Canvas-format workflow exports live in example workflows/. See the README there for conventions — most importantly never commit an api_token, since workflow JSON stores widget values verbatim.

Structure

comfyui-arkennemasis/
│
├── __init__.py              THE HUB — loads every module and merges their node maps.
│                            The only file you touch when adding something.
│
├── common/                  SHARED CODE — written once, reused by every module
│   ├── keys.py                 resolve_key(): node field → env var → .env
│   ├── image_utils.py          tensor ↔ data-URI ↔ bytes, text normalising
│   ├── throttle.py             serial_lock(), concurrency_gate(), with_retry()
│   ├── banner.py               the load-time ASCII banner (ARK_BANNER=0 silences it)
│   ├── system_instructions.py  the System Instructions node
│   ├── shot_selector.py        the Shot Selector node (lazy input + ExecutionBlocker)
│   ├── subject_line.py         the Subject Line node (gender stated once, not per prompt)
│   ├── text_file_save.py       the Text File Save node (caption sidecars)
│   ├── run_folder.py           the Run Folder node (auto-numbered per run)
│   ├── scene_list.py           the loop: OUTPUT_IS_LIST fans a scene plan out
│   ├── hailuo_scene.py         one scene start to finish, freed before the next
│   ├── ass_captions.py         font discovery + the five subtitle styles as ASS
│   ├── caption_style.py        the Caption Style node
│   └── video_assemble.py       the aggregate end: join, level, duck, burn
│
├── codex_provider/          ChatGPT/Codex OAuth — no API key
│   ├── auth.py                 reads `codex login` creds, refreshes + persists them
│   └── nodes.py                Codex Image Gen + Codex Login Status
│
├── replicate_provider/      ONE PROVIDER = ONE FOLDER
│   ├── nodes.py                Replicate LLM + Image Gen nodes
│   └── settings.py             the shared Image Gen Settings node
│
├── variation/               PRODUCT-VARIATION PIPELINE — a use case, not a provider
│   ├── schema.py               the canonical 3-table schema + every validator
│   ├── colour.py               sRGB↔Lab, ΔE2000, robust sampling, shading-preserving recolour
│   ├── intake.py               Sheet Probe + Variation Intake
│   ├── spec_library.py         download, cache and hash every reference
│   ├── plate_lock.py           freeze and measure the base plate; Region Mask
│   ├── recipe.py               Tier 0 brief, compile+validate, and the human gate
│   ├── cells.py                the N-axis cartesian product, and one cell by index
│   ├── prompt_build.py         substitution-only prompts + the constancy audit
│   ├── job_store.py            durable job records, lazy resume, the run report
│   ├── recolour.py             the non-generative path and the per-axis router
│   ├── verify.py               identity / frame / colour / bleed, and calibration
│   └── deliver.py              format ladder, review board, store import file
│
├── fonts/                   CAPTION FONTS — 13 OFL/Apache families, see fonts/README.md
│
├── example workflows/       canvas .json exports demonstrating the nodes
│
├── web/                     FRONT-END (auto-served via WEB_DIRECTORY)
│   └── activity.js             running / "cooking" badge on the node
│
├── requirements.txt         dependencies
├── pyproject.toml           ComfyUI-Manager metadata
├── .env.example             key template users copy to .env
├── README.md
└── LICENSE

Menu categories are set per node class, so one provider folder can feed several categories (Replicate already serves both LLM and Image Gen):

arkennemasis/
├── LLM         ← replicate_provider · codex_provider
├── Image Gen   ← replicate_provider · codex_provider · (fal_provider · …)
├── Video       ← common/ modules (Scene List, Hailuo Scene, Video Assemble, …)
├── Audio       ← common/qwen_tts_node
├── Variation   ← variation/ (a USE CASE, not a provider — it calls the others)
└── Utility     ← common/ modules (System Instructions, Shot Selector, Run Folder, …)

variation/ is the first sub-package organised around a use case rather than a backend. It owns no model and no API client: it calls codex_provider's LLM and image nodes like any other consumer would. That is the shape to copy for the next pipeline — providers stay thin and swappable, use cases compose them.

Adding a module — 3 steps

1. New folder with a nodes.py ending in the two standard dicts:

NODE_CLASS_MAPPINGS = {"OllamaLLM": OllamaLLM}
NODE_DISPLAY_NAME_MAPPINGS = {"OllamaLLM": "arkennemasis Ollama LLM"}

2. Give each node class its menu placement:

class OllamaLLM:
    CATEGORY = "arkennemasis/LLM"      # or /Image Gen, /Utility, /Video Gen, /Audio …

3. Register it in __init__.py:

def _ollama():
    from .ollama_provider.nodes import (
        NODE_CLASS_MAPPINGS as c, NODE_DISPLAY_NAME_MAPPINGS as d,
    )
    return c, d

_load("ollama provider", _ollama)      # next to the existing _load calls

_load() isolates failures: if a module raises (missing dependency, upstream API change) it logs [arkennemasis] 'ollama provider' not loaded: … and every other module keeps working. Someone who only wants the Ollama nodes never needs a Replicate account.

Reuse instead of rewriting

| Need | Use | |---|---| | API key from field / env / .env | from ..common.keys import resolve_key | | ComfyUI image → send to an API | collect_images_to_data_uris(img1, img2, …) | | API response → ComfyUI IMAGE | bytes_list_to_image_tensor(output_to_bytes_list(out)) | | stream / list / str → clean text | output_to_text(out) | | long API call without freezing the UI | copy the async run() + asyncio.to_thread(self._blocking, …) pattern in replicate_provider/nodes.py | | serialise calls across nodes | async with serial_lock(): … (common/throttle.py) | | survive a 429, a 5xx or a dropped connection | with_retry(lambda: client…create(…)) — retries only calls that got no complete answer; refusals and bad requests raise straight away | | mark your own exception retryable | set retryable = True on it; common/throttle.is_transient honours it | | skip an expensive branch entirely | lazy input + check_lazy_status returning [], then ExecutionBlocker(None) — see common/shot_selector.py | | one output folder per run | next_run_folder(parent, name) (common/run_folder.py) | | reuse a codex login session | codex_provider/auth.py (get_access_token, request_headers) | | write a sidecar file atomically | common/text_file_save.py (.part + os.replace) | | activity badge on a node | add the class key to ANIMATED_NODES in web/activity.js |

Four rules

1. Class keys are permanent. "OllamaLLM" is the ID saved inside every workflow — renaming it breaks those workflows ("missing node" on load). Display names and categories are cosmetic and safe to change anytime.

2. New dependencies go in requirements.txt and are imported inside the function, not at module top level — so a user missing that package loses only that node.

3. Append new widgets at the end of the optional block. A workflow stores widget values as a positional list, so inserting one in the middle shifts every later value and silently corrupts saved workflows. Adding a socket (a non-widget type) is always safe.

4. Every node that makes the user wait gets the activity badge. If it calls a network API, polls, or otherwise takes more than a moment, add its class key to ANIMATED_NODES in web/activity.js — otherwise the graph looks frozen and people re-queue it. Instant nodes stay out: a spinner that appears and vanishes in one frame is just flicker.

   const ANIMATED_NODES = new Set([
     "ReplicateOpenAILLM",
     "ReplicateOpenAIGPTImage2",
     "ArkCodexImageGen",
     "YourNewLongRunningNode",   // <- add it here
   ]);
   

License

MIT