{
  "skill_id": "gf-listing-ab-brief-factory",
  "name": "Listing A/B Brief Factory",
  "evaluation": "free",
  "quality": "agent-decision-grade",
  "functional": true,
  "price_usd": 0.49,
  "category": "Launch",
  "tier": "starter",
  "kind": "good",
  "tags": [
    "x402",
    "goods-factory",
    "good",
    "functional",
    "sealed-runtime",
    "gf-complete"
  ],
  "summary": "Brief templates to design fair A/B tests for skill and digital-good listing pages.",
  "when_to_use": [
    "You are about to change listing title or summary and want a controlled A/B brief",
    "Multiple price-display formats exist and you need a single-variable test plan",
    "Agent storefront CTAs differ and you want comparable experiment definitions"
  ],
  "outline": [
    "Pick one primary hypothesis surface (title, summary, hero benefit, price display, or CTA) and lock secondary surfaces as control",
    "Write variant A and B copy slots with character limits matched to the marketplace UI",
    "Define the success metric, observation window, and minimum sample rule in plain ops language",
    "Document stop and roll-forward rules so weak variants do not run indefinitely",
    "Package the brief with traffic notes for agent-referred vs organic listing entry so segments stay comparable"
  ],
  "capabilities": [
    "Single-variable listing experiment brief template",
    "UI-aware character-limited copy slots",
    "Metric, window, and sample-rule definition fields",
    "Stop and segment-comparability notes for agent traffic"
  ],
  "artifact_outputs": [
    "listing-ab-brief-template.md",
    "variant-copy-slots.json",
    "experiment-stop-rules.md"
  ],
  "decision_criteria": [
    "Outline steps are specific to this skill (not generic templates)",
    "Sealed pack exposes createSkill().run with outline-driven steps",
    "Artifacts are named concrete deliverables",
    "No revenue guarantees or banned claims",
    "Free eval path works without payment"
  ],
  "sealed_after_pay": [
    "Full src/index.js runtime (createSkill, run, plan)",
    "src/runbook.js with skill-specific steps",
    "src/tools.js registry for agent ToolRegistry",
    "WORKBOOK.md operator procedure",
    "templates/ checklist and artifact shells",
    "schemas/output.schema.json"
  ],
  "runtime": {
    "entry": "src/index.js",
    "export": "createSkill",
    "install": "node scripts/install-unlocked-pack.mjs unlock.json ./skills"
  },
  "challenge": "https://lvlltd.com/api/pay?skill=gf-listing-ab-brief-factory",
  "sample": "https://lvlltd.com/skills/gf-listing-ab-brief-factory/sample.md",
  "pack_meta": "https://lvlltd.com/api/packs?skill=gf-listing-ab-brief-factory",
  "teaser": "https://lvlltd.com/sealed/gf-listing-ab-brief-factory/",
  "proof": "https://lvlltd.com/api/proof",
  "standards": [
    "x402",
    "ERC-7857"
  ],
  "operator_notes": [
    "Confirm pay path with GET /api/pay before purchasing.",
    "Dry-run createSkill().run({ goal, dry_run: true }) after unlock.",
    "Persist payment.txHash with skill_id for re-redeem.",
    "Never commit private keys or OPS_SECRET into pack usage.",
    "Category focus: Launch. Kind: good.",
    "Claim scrub: no guaranteed ROI, no fake testimonials.",
    "If outline 404s on production, redeploy public/skills after completion pass."
  ]
}