Brand Illustrate

brand-illustrate

Announce at start: "I'm using the humane:brand-illustrate skill to generate an on-brand illustration set from existing tokens."

Ring-2 humane skill. It reads the on-brand contract a design-tokens set already carries (palette with roles, fonts, shape, and the $extensions brand block) and walks the user through a short questionnaire — JTBD-style, one step at a time — to scaffold prompts that stay on-brand and generate a set that reads as one family.

Generators live outside the plugin. This skill is a thin adapter: it composes the prompt and shells out to whichever backend is installed. It never bundles a generator, an API client, or your keys.

No backend is not a dead end. The prompts are what this skill actually produces — assembled from the palette, the brand block, and the merged de-slop negatives — and they are the same whether or not an API call follows. With no generator present, a run writes prompts.md with every final prompt at its target size, plus metadata.json and the recipe. Paste them into any image tool, or install a backend and resume with run --recipe.

Finding a backend

Discovery makes no assumption about which agent you run. First hit wins:

Row 1 is the layered setting setup owns, not the environment variable alone — a config file legitimately outranks a variable exported in the calling shell.

scripts/illustrate.py backends -v prints what was found and every location searched — use it before concluding anything is missing.

Where output goes

A batch — images, prompts.md, metadata.json, the contact sheet, and the saved recipe — goes in .design/illustration-<batch><batch>/, the setup setting defaulting to corpus_root, unless --out-dir names a place. setup/references/paths.md owns the full table.

What you need first

A token file (design.tokens.json or <name>.tokens.json) produced by humane:design-tokens. That file is the style contract. If the user has no token set yet, send them to design-tokens first — do not invent a brand.

The questionnaire

Ask one step at a time and wait for the answer before the next. Use a structured multiple-choice question tool when the agent has one; fall back to a plain numbered question otherwise. Never dump all seven steps at once.

Claude Code extras: use AskUserQuestion for the multiple-choice steps (purpose, platforms, backend, budget) — it renders the presets as pickable options. On other agents, list the options as plain text and read back the reply. If a stale OPENAI_API_KEY env var shadows a keychain/SOPS key, invoke the gpt-image-2 path with OPENAI_API_KEY="" so the backend decrypts its own.

Step 0 — Reuse last recipe? (only if one exists)

Look for <tokenset>.illustrate-recipe.json next to the token file. If present, offer: "Reuse your last illustration recipe (subject, style, sizes, backend), or start fresh?" Reuse means jump straight to generation with the saved answers; "tweak" means pre-fill the questionnaire with them.

Step 1 — Subject & purpose (always asked)

"What should the illustration show, and where will it live?" Capture a concrete subject (the thing in frame) and the purpose/placement. This is the only mandatory step — see Fast path below.

Step 2 — Style & mood beyond the tokens

Read the token $extensions["community.design-tokens.brand"] block first. If it already sets mood and imageryStyle, confirm them rather than re-ask ("Your brand reads as precise, editorial, calm, flat vector — keep that?"). If the tokens are silent on art direction (no brand block, or no imageryStyle), you must ASK — never guess a style. Offer a few directions (flat vector / editorial illustration / isotype pictograms / textured print) and let the user pick or describe their own. To fix this permanently, run humane:design-tokens setup and author the brand block once, so future batches confirm the style instead of re-asking.

Step 3 — Count & variants

"How many images, and are they variants of one idea or different subjects?"

• variants of one concept → set count, reuse one seed/anchor for coherence;
• a set of distinct subjects → collect a variants list (one subject per image).

Step 4 — Sizes / platforms

Offer the presets (multi-select):

Multiple are fine — each subject renders at every chosen size.

A preset is a size requested of the backend, never a resize. Nothing in this skill resizes an image — that would need an image library, and these scripts are stdlib only. gpt-image-2 takes any exact size. nano-banana takes only its own named platforms, which match the first four presets exactly but have no equivalent for spot-ui — that image returns at nano's default size. Each entry in metadata.json carries size_requested, and a run reports unsized_platforms. When it is non-empty, say so rather than handing over an image for a slot that needs exact pixels; switch to gpt-image-2 for that preset, or resize it in a real image tool.

Step 5 — Backend & budget

"Which generator, and draft or final?" Backends: gpt-image-2 (accepts a seed flag, though see Coherence, honestly — it is recorded, not yet sent), nano-banana (native reference-image style transfer), or auto (prefers gpt-image-2). Budget: draft (cheap, ~$0.006/img on gpt-image-2) first, final only once a direction is approved.

The backend also comes from the image_backend setting owned by setup — project humane.json > ~/.humane/config.json > HUMANE_IMAGE_BACKEND > auto. A configured value other than auto outranks a stored recipe's choice, because that is what a user reaches for to redirect a run. auto is not a choice and leaves the recipe alone. scripts/illustrate.py backends prints which value won and which layer supplied it.

Step 6 — Reference images (optional)

"Any reference images to steer the look?" If yes, point at a directory. If it has a refs.json (from design-tokens annotate), roles are read from it; otherwise ask per image what to take (palette / mood / composition / texture).

Step 7 — Extra negatives (optional)

"Anything specific to avoid?" These merge on top of the built-in de-slop list — you don't need to restate "no glassmorphism / no 3D blobs", those are always on.

Fast path (guardrail)

If the user just wants one on-brand image ("make me an og-image of X"), ask only Step 1 and derive the rest from the tokens + defaults (count 1, the purpose's platform preset, auto backend, draft budget, de-slop negatives). The questionnaire must never be slower than a raw generator prompt for a single image.

Quick reference

Running it

The adapter does scaffold assembly, backend probing, generation, metadata, recipe, and the contact sheet. For concrete command examples and the full answers.json schema, use the command catalog: references/run-catalog.md.

What a batch produces

A timestamped batch directory containing:

• the generated PNGs, named <subject>-<NN>-<platform>.png;
• metadata.json — backend, seed, per-image prompt + command + size + return code;
• contact-sheet.html — a de-slop-clean thumbnail grid (open it to review);
• and, next to the token file, <tokenset>.illustrate-recipe.json — the resolved answers, so the next batch starts from Step 0, not from zero.

Review handoff

After generation, offer review:

• if the cull CLI is available, import the batch dir for rating / shortlisting ("open these in Cull");
• otherwise open the generated contact-sheet.html — it already follows layout-rules (real headings, honest filenames, theme-aware, no eyebrow labels).

Coherence, honestly

• gpt-image-2 accepts a --seed, and the whole set reuses one so the intent is recorded; a default is injected when the user gives none. This does not currently reproduce a batch. The generator we shell out to takes the seed, prints it, and writes it to metadata.json, but its request builder marks the parameter reserved for future API support and never sends it. So the seed is a faithful record of what was asked for and nothing more. Do not promise a re-run will return the same images — check whether the installed generator sends the seed before telling a user otherwise.
• nano-banana has no seed. The adapter anchors the series instead: the first successful image becomes a --reference for the rest. Coherence is strong but not pixel-deterministic — say so if the user expects exact reproduction.
• In short: neither backend reproduces a batch exactly today. Coherence within a run is real; reproduction across runs is not.

Guardrails (do not violate)

• Generators stay outside the plugin — never bundle or reimplement one, and never handle an API key. With none installed, hand back prompts.md and the resume command; do not treat it as a failure.
• No style invention. When the tokens are silent on art direction, ASK (Step 2).
• Fast path for one-off images: Step 1 only.
• Portability: the core flow names no Claude-only tool, and backend discovery names no single agent's directory. illustrate.py is stdlib-only and reads the token file directly (it does not import design-tokens), so the skill runs on any agent that installed it alone.

Tests

bashCopy code
cd brand-illustrate && python3 -m unittest discover -s tests -v

Covers scaffold assembly, negative-list merging, platform preset resolution, the no-backend message, and recipe round-trip.