pbakaus/impeccable · error

concept-seed: --grain must be one of ${COMPOSITION_GRAINS.jo

Error message

concept-seed: --grain must be one of ${COMPOSITION_GRAINS.join(', ')}

What it means

Thrown when --grain is provided but is not one of COMPOSITION_GRAINS: product, flow, view, region. Grain names how much of the product is in play (a whole site vs. a flow vs. one view vs. a region), and only those four values are cataloged. null/undefined means no grain preference and is allowed.

Source

Thrown at plugin/skills/impeccable/scripts/concept-seed.mjs:327

  if (!Number.isInteger(reroll) || reroll < 0) {
    throw new Error('concept-seed: --reroll must be a non-negative integer');
  }
  if (register !== null && register !== 'safer' && register !== 'bolder') {
    throw new Error('concept-seed: --register must be safer or bolder');
  }
  if (register !== null && reroll < 1) {
    throw new Error('concept-seed: --register steers a re-roll round; pass --reroll <n> with it');
  }
  if (register !== null && scope !== 'direction') {
    throw new Error('concept-seed: --register applies to direction rounds only');
  }
  if (mode !== null && !SEED_MODES.has(mode)) {
    throw new Error('concept-seed: --mode must be persuade, operate, read, or experience');
  }
  // Grain needs no mode: how much of the product is in play is independent of
  // which register of work it is.
  if (grain !== null && !COMPOSITION_GRAINS.includes(grain)) {
    throw new Error(`concept-seed: --grain must be one of ${COMPOSITION_GRAINS.join(', ')}`);
  }
  if (platform !== null && !COMPOSITION_PLATFORMS.includes(platform)) {
    throw new Error(`concept-seed: --platform must be one of ${COMPOSITION_PLATFORMS.join(', ')}`);
  }
  if (!Number.isInteger(candidateCount) || candidateCount < 5 || candidateCount > 7) {
    throw new Error('concept-seed: --candidate-count must be an integer from 5 to 7');
  }
  const unit = (salt) => {
    const h = crypto.createHash('sha256').update(`${scope}:${salt}:${key}`).digest();
    return h.readUInt32BE(0) / 0xffffffff;
  };
  const indexSalt = reroll === 0 ? 'index' : `index:reroll-${reroll}`;
  const buildIndex = 3 + Math.floor(unit(indexSalt) * (candidateCount - 2)); // 3..candidateCount
  // Surface scope deals a hand of three grounded structures: one card is not
  // a choice, and the full ranked list would hand selection back to the
  // model's taste. The dice pick all three; the primary index leads. The
  // no-lineup rule stays direction-only, where it was written for worlds.
  const dealtIndices = [buildIndex];

View on GitHub (pinned to d14711ae3d)

Solutions

1. Use exactly one of: --grain product, --grain flow, --grain view, --grain region.
2. Omit --grain to deal compositions without a grain preference.

Example fix

# before
$ node concept-seed.mjs --scope surface --grain section ...

# after
$ node concept-seed.mjs --scope surface --grain region ...

const COMPOSITION_GRAINS = ['product', 'flow', 'view', 'region'];
if (grain != null && !COMPOSITION_GRAINS.includes(grain)) {
  throw new Error(`--grain must be one of: ${COMPOSITION_GRAINS.join(', ')}`);
}

function isValidGrain(value) {
  return value == null || ['product','flow','view','region'].includes(value);
}

try {
  await seedConcepts({ scope, grain });
} catch (err) {
  if (/--grain must be one of/.test(err.message)) {
    console.error('Use --grain product|flow|view|region, or omit it.');
  } else throw err;
}

When it happens

Trigger: Passing --grain with a value like 'page', 'section', 'component', 'app', 'screen' — none are valid. The check is grain !== null && !COMPOSITION_GRAINS.includes(grain).

Common situations: CLI typo; using a near-synonym ('section' instead of 'region', 'page' instead of 'view'); a UI exposing free-text grain.

Related errors

• concept-seed: --scope must be direction or surface
• concept-seed: --reroll must be a non-negative integer
• concept-seed: --register must be safer or bolder
• concept-seed: --register steers a re-roll round; pass --rero
• concept-seed: --register applies to direction rounds only

AI-assisted analysis of pbakaus/impeccable@d14711ae3d (2026-08-13). Data as JSON: /api/errors/268adfd5bf7a92fe. Report an issue: GitHub.