{
  "skill_id": "gf-studio-thumbnail-ctr-hypotheses",
  "name": "Thumbnail CTR Hypothesis Lab",
  "evaluation": "free",
  "quality": "agent-decision-grade",
  "functional": true,
  "price_usd": 3.99,
  "category": "Creative",
  "tier": "standard",
  "kind": "service",
  "tags": [
    "x402",
    "goods-factory",
    "service",
    "functional",
    "sealed-runtime",
    "gf-complete"
  ],
  "summary": "Design testable thumbnail CTR hypotheses: face vs object, text density, contrast, and A/B matrices without promising lift numbers.",
  "when_to_use": [
    "Planning A/B or multivariate thumbnail tests for a series",
    "Agents generate thumbnails without a testable design hypothesis",
    "Need kill criteria before spending more creative rounds"
  ],
  "outline": [
    "Define audience segment, series context, and one primary CTR hypothesis",
    "Specify variant axes: face, object, text density, contrast, emotion",
    "Build a small matrix of named variants with production notes",
    "Set measurement window, sample floor, and kill/keep criteria",
    "Emit hypothesis-lab.md, variant-matrix.csv, and test-protocol.json"
  ],
  "capabilities": [
    "Single-primary-hypothesis framing for thumbnail tests",
    "Variant axis design with production-ready notes",
    "Named variant matrix for creative agents",
    "Honest measurement and kill/keep protocol (no fake benchmarks)"
  ],
  "artifact_outputs": [
    "hypothesis-lab.md",
    "variant-matrix.csv",
    "test-protocol.json"
  ],
  "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-studio-thumbnail-ctr-hypotheses",
  "sample": "https://lvlltd.com/skills/gf-studio-thumbnail-ctr-hypotheses/sample.md",
  "pack_meta": "https://lvlltd.com/api/packs?skill=gf-studio-thumbnail-ctr-hypotheses",
  "teaser": "https://lvlltd.com/sealed/gf-studio-thumbnail-ctr-hypotheses/",
  "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: Creative. Kind: service.",
    "Claim scrub: no guaranteed ROI, no fake testimonials.",
    "If outline 404s on production, redeploy public/skills after completion pass."
  ]
}