fix(generate): emit Flux.2 through the live node, not the deprecated one (BE-13301)

[annehe9]

Why

--emit-workflow built flux-2 graphs around Flux2ProImageNode. ComfyUI deprecated that class in the same commit that added Flux2ImageNode, so the workflow the agent handed back carried a DEPR badge. A user reported exactly that, which is what opened BE-13301.

This is the change that fixes what they saw. #864 made the exemption visible and #866 exposes the mapping to cloud, but neither changes the emitted graph. This one does.

What changed

flux-2 now maps to Flux2ImageNode, and the deprecated_ok exemption #864 added to hold the line comes off.

It is not a rename. The classes are shaped differently, which is why the replacement exists:

	Flux2ProImageNode (deprecated)	Flux2ImageNode (live)
top-level	prompt, width, height, seed, prompt_upsampling	prompt, model, seed
under the combo	—	model.width, model.height, model.images[1..8]

Width and height moved inside a model dynamic combo, so they are addressed through it.

That needed no new machinery, which I did not expect. param_map maps a CLI flag to a node input key, and the key can simply be dotted. ops_from_api_workflow already orders plain widget keys ahead of dotted ones so the combo selection lands before the sub-widgets it exposes, and apply_specs resolves them from there.

Two deliberate choices worth review:

• "Flux.2 [pro]" is the fixed combo option. It is the one that posts to this entry's endpoint, so the alias keeps meaning the model it has always meant. The node's other option, "Flux.2 [max]", is a different model at a different price and wants its own alias rather than being reachable by accident from this one.
• prompt_upsampling is dropped from the mapping. The proxy takes it, this node does not expose it, so an emitted workflow cannot carry it either way. comfy generate without --emit-workflow still sends it straight to the proxy.

What guards it

Flux2ImageNode is recorded in the partner fixture from the catalog cloud's deployed ComfyUI serves, which lets the two existing contracts do the work:

• the widget-coverage test confirms every widget input the node declares is emitted,
• fix(generate): read the --emit-ops deprecation exemption from the node spec (BE-13301) #864's bidirectional deprecated_ok assert now requires the flag to be absent, so a stale exemption cannot outlive this migration.

The round-trip test is extended to assert the combo selection survives alongside its sub-widgets. Without the selector the sub-widgets have nothing to hang off, so asserting it is what makes the width and height assertions mean anything.

Checks

pytest tests/comfy_cli/command/generate      350 passed
ruff check / ruff format --check             clean

Round trip verified directly, API format in and lowered back out:

emitted:  {"model": "Flux.2 [pro]", "model.width": 512, "model.height": 768, "seed": 0, "prompt": "a fox"}
ops:      set_widget model, seed, prompt  then  model.width, model.height
lowered:  same keys, same values, allow_deprecated False on every add

Not in scope

ImageBatch, the other deprecated class this emitter mints, is tracked separately in BE-13516. It is blocked on BE-10726 because apply_specs cannot wire an autogrow slot at all, which is a different gap from the dotted combo keys this PR uses.

🤖 Generated with Claude Code

Unmapped flags now fail on every alias

The unmapped-flag check is not flux-2 only. --emit-workflow and --emit-ops now fail on any flag that the alias's MODEL_NODE_MAP entry does not wire into the node. Before this PR, every one of these flags was dropped without a word.

alias	flags that now fail
flux-2	input_image, input_image_2 … input_image_9, output_format, prompt_upsampling, safety_tolerance
flux-ultra	guidance_scale, negative_prompt, num_images, num_inference_steps
kling-i2v	callback_url, camera_control, dynamic_masks, element_list, external_task_id, image_tail, multi_prompt, multi_shot, shot_type, sound, static_mask, watermark_info
nano-banana	none
seedance	fps, return_last_frame

test_emit_refused_flags_per_alias pins this table. It walks MODEL_NODE_MAP, sends each flag from the alias's schema one at a time, and records which ones fail. Wiring a flag later means removing it from the table.

The cloud agent will see this after its next comfy-cli pin bump. Its generate_workflow tool passes the flags the model chose after reading generate_schema. The error names the flags and the fix:

--emit-workflow for 'flux-2' does not map --input_image onto Flux2ImageNode. Drop that flag, or run `comfy generate flux-2` without --emit-workflow, which sends every flag straight to the proxy.

The message blames the mapping, not the node. Some flags have no input on the node, such as flux-2's prompt_upsampling. Others have an input the mapping does not wire yet, such as flux-2's input_image and model.images. Wiring model.images is a follow-up.

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📝 Walkthrough

Walkthrough

The flux-2 alias now emits Flux2ImageNode with a fixed model selector and nested dynamic-combo dimensions. Workflow generation rejects unsupported user flags. The partner node fixture defines model options, reference images, outputs, and pricing. Tests validate emission, deprecation handling, validation, and round trips.

Changes

Flux.2 node migration

Layer / File(s)	Summary
Node contract and alias mapping tests/comfy_cli/command/generate/fixtures/partner_nodes_object_info.json, comfy_cli/command/generate/emit.py	Defines Flux2ImageNode with dynamic model options, nested dimensions, reference images, and pricing. Maps flux-2 to this node with Flux.2 [pro] fixed.
Emission and validation comfy_cli/command/generate/emit.py, tests/comfy_cli/command/generate/test_emit.py	Rejects unsupported flags, reports all offending flags, ignores None values, and preserves aspect-ratio folding and fixed defaults.
Round-trip and catalog regressions tests/comfy_cli/command/generate/test_emit.py, tests/comfy_cli/command/generate/test_emit_ops.py	Updates class type, nested dimension, deprecation, save-link, and widget-order assertions for Flux2ImageNode.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to b4fb6

The Flux.2 workflow migration preserves the required model and dimension inputs while rejecting unsupported flags explicitly. No unresolved merge-readiness risk was identified.

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Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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In `@comfy_cli/command/generate/emit.py`:
- Around line 193-195: Update build_workflow to reject explicitly supplied
values that cannot be represented in the emitted workflow, using the parsed
explicit-argument keys rather than NodeSpec.fixed defaults. Validate keys absent
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• comfy_cli/command/generate/emit.py
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[skishore23]

Checked this one properly. 354 pass, ruff clean. The fixture Flux2ImageNode matches the catalog cloud actually serves, including the 256..2048 step 32 bounds, and Flux2ProImageNode is deprecated:true there. The plain-before-dotted ordering in ops_from_api_workflow is already on main from #840. Ran --emit-workflow and --emit-ops for flux-2 by hand and the graph comes out right. Reverting node_class back to the pro node trips the #864 assert like it should. Approving the migration.

Two things on the generic unsupported flag check, non blocking but id like them before or right after merge.

1. Its not flux-2 only. It now hard errors on every mapped model, so flux-ultra --negative_prompt, seedance --fps, kling-i2v --camera_control and about 14 more flags that used to be dropped silently. I think loud is better than silent, but its only tested on flux-2 and the description doesnt mention it. The cloud agents generate_workflow tool forwards whatever flags the model picked from generate_schema, so after the next pin bump the agent will see these errors. The message tells it what to do so thats ok, but please add one table driven test that walks MODEL_NODE_MAP and pins which flags raise for which alias, and say so in the description.
2. The message says the node has no matching input. Thats wrong for some of them. flux-2 --input_image raises but Flux2ImageNode does have model.images, we just dont wire it. Same for kling --image_tail. Blame the mapping not the node. Wiring model.images is a follow up.

Small stuff: the header comment at emit.py:168 still says Node: Flux2ProImageNode. "Drop the flag" is singular for a list. Stray f prefix at emit.py:371. deprecated_ok=True now has no live entry in the map so the only positive coverage is ImageBatch, fine for now. The value is not None guard and the dotted ordering both survive being deleted, the ordering only because fixed{} happens to insert model first.