{"slug":"genart","title":"genart","summary":"Craft long-form generative art for onchain platforms — Art Blocks, 256ART, Verse, Highlight, Plottables, bootloader.art, or a self-hosted drop — and for screen diffusion channels such as Artpoint. Covers hash-seeded determinism, resolution-agnostic rendering, features and rarity ","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-09-26T16:29:19.125378Z","repo":{"url":"https://github.com/camilleroux/genart-skill","stars":143,"forks":13,"license":"MIT","updatedAt":"2026-09-25T22:50:31Z"},"bodyHtml":"
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name: genart\ndescription: >\nCraft long-form generative art for onchain platforms — Art Blocks, 256ART,\nVerse, Highlight, Plottables, bootloader.art, or a self-hosted drop — and for\nscreen diffusion channels such as Artpoint. Covers hash-seeded determinism,\nresolution-agnostic rendering, features and rarity design, preview capture\nsignals, debug GUIs and image/video export shortcuts, verification of a sketch\nbefore minting, and the ethics of the field. Use when the user mentions\ngenerative art, gen art, creative coding, long-form, onchain art, a seeded\nsketch, a PRNG or deterministic randomness, traits, rarity, features, a mint,\na plotter or SVG output, art on screen or delivering a piece as a video, or\npastes platform APIs such as tokenData, $features, inputData, $bootloader,\nBTLDR, hl-gen, or a base64 payload query param.\nuser-invokable: true\nargument-hint: \"[platform|check|render] [path]\"\nlicense: MIT\nmetadata:\nauthor: Camille Roux\ncategory: generative-art

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Generative art

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Help design, write and check long-form generative artworks — pieces where one\nalgorithm produces a whole edition, each output derived from a hash the\nblockchain hands you at mint time.

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Default practices, and when to break them

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These are defaults that work most of the time, not rules. Every one of them has\nlegitimate counter-examples, and those are often the interesting pieces. State\nthe default, then state what breaking it costs.

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DefaultBreaking it is legitimate when…
All variation comes from the hashThe piece deliberately reads live onchain state (owner, block data). It is then no longer reproducible from the hash alone — own that choice and document it
One seeded PRNG, fixed consumption orderAlmost never. But named sub-streams let you add a draw without shifting the whole edition — that is how you get flexibility without breaking the property
No network, no CDN, no system fontsSome platforms have an explicit external-asset mode, under their own rules
No wall clockThe piece is about time passing, or is genuinely interactive. The preview render must stay stable regardless
Sizes relative to the canvas dimensionThe piece is deliberately adaptive and reveals more detail with more room. A choice, not an accident — then know what size it will be captured at
Runs on current browsers and devices — Chrome, Firefox, Safari, mobile includedA piece built on a bleeding-edge API (WebGPU…) or needing real GPU power is a choice: state the requirement, keep the preview/capture path rendering everywhere, and remember collectors open links on phones
Emit the platform's render-done signalNever. A blank thumbnail is a failure with no upside
Features computed before render, from the seed onlyWhere the platform computes features outside a browser, it is required. Elsewhere it is a convenience
Debug code is stripped from the submitted buildWhere code is stored unminified and readable onchain, formatting is part of the work
Never claim \"it's deterministic\" without testing it, and without stating the scopeNever
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The firm part: breaking a default must be the artist's explicit choice, never\nan accident. Point out the deviation, explain what it costs, then do what the\nartist asked. Do not refuse and do not lecture.

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Ethics

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Full version: references/ethics.md.

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Platforms: read the docs, every time

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Platform APIs change and the fiches in references/platforms/ deliberately hold\nno versions, no numbers and no field names — only the stable mental model, the\ncanonical URLs and the questions to ask.

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So the sequence is always: open the fiche → fetch the URLs it lists → then\nwrite code. Never write platform-specific code from memory, and never from the\nfiche alone. If a doc is unreachable, say so and flag what could not be\nconfirmed.

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TargetFiche
Art Blocks (incl. Engine / Flex)references/platforms/artblocks.md
256ARTreferences/platforms/256art.md
Versereferences/platforms/verse.md
Highlightreferences/platforms/highlight.md
Plottables (pen plotter, AB Engine)references/platforms/plottables.md
bootloader.art — ask which bootloaderreferences/platforms/bootloader.md
Self-hosted / no platformreferences/platforms/self-hosted.md
Artpoint — art on screen, you deliver a video, not codereferences/platforms/artpoint.md
Undecided between tworeferences/platforms/comparison.md
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Where to look

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When the question is about…Read
Seeding from a hash, PRNG choice, sub-streams, distributions, things that silently break reproducibilityreferences/determinism.md
Output that changes with canvas size, stroke weights, noise frequency, element density, print or plotter outputreferences/resolution.md
Designing traits, rarity tables, weights, distribution that came out wrongreferences/features.md
Originality, attribution, licences, disclosing AI usereferences/ethics.md
Debug panel, param tweaking, keyboard shortcuts, PNG and video export, contact sheetsreferences/tooling.md
\"Is my sketch actually deterministic?\", pre-mint checking, what a test can and cannot provereferences/verification.md
Techniques, tutorials, libraries, inspiration, what other artists useFetch https://github.com/camilleroux/awesome-generative-art — a maintained list; do not paraphrase it from memory
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Runnable scripts

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Two scripts ship with the plugin and run in place — never copy them into a\nproject. They need Playwright installed in the artist's project and print the\ninstall command if it is missing. Contract and details: references/verification.md.

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CommandDoes
node \"$CLAUDE_PLUGIN_ROOT/scripts/check.mjs\" <dir>Determinism: repeatability, distinctness, global-state contamination, feature stability
node \"$CLAUDE_PLUGIN_ROOT/scripts/render.mjs\" <dir> --hash 0x…One PNG — render it, then look at it with Read before judging any visual change
node \"$CLAUDE_PLUGIN_ROOT/scripts/render.mjs\" <dir> --grid NContact sheet, hash + features under each tile
node \"$CLAUDE_PLUGIN_ROOT/scripts/render.mjs\" <dir> --census N --edition-size EReal feature distribution vs the rarity table
node \"$CLAUDE_PLUGIN_ROOT/scripts/render.mjs\" <dir> --batch N --size 2400N individual full-res PNGs, hash-named — portfolio/print export
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When asked to change how a piece looks, close the loop yourself: edit → render\none hash → Read the PNG → judge → adjust. Do not describe a visual change you\nhave not looked at.

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Workflow

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  1. Target first. Which platform? If undecided, references/platforms/comparison.md. Once decided,\nopen its fiche and fetch its docs before writing anything.
    2. \n
  2. Decide the rarity table before coding. It is much harder to retrofit.
    3. \n
  3. Build. Defaults above; deviations discussed, not silently taken.
    4. \n
  4. Look at many outputs, not one. A single good render proves nothing —\nrender.mjs --grid exists for this.
    5. \n
  5. Check before minting — check.mjs, then references/verification.md for\nwhat the green result does and does not prove.
    6. \n
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