JSON-LD structured data for skill listings

app/skills/[slug]/page.tsx

@@ -4,6 +4,7 @@ import Link from "next/link"
 import { skills, getSkillBySlug } from "@/lib/skills"
 import { LICENSE_LABEL } from "@/lib/types"
 import { agenticUrl, priceDisplay } from "@/lib/x402"
+import { skillJsonLd } from "@/lib/jsonLd"
 import { PlatformBadge } from "@/components/PlatformBadge"
 import { CopyButton } from "@/components/CopyButton"
 import { SkillCard } from "@/components/SkillCard"
@@ -57,6 +58,12 @@ export default async function SkillDetailPage({ params }: Props) {
 
   return (
     <div style={{ backgroundColor: "#000000", minHeight: "100vh" }}>
+      {/* schema.org SoftwareApplication structured data for rich results */}
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{ __html: JSON.stringify(skillJsonLd(skill)) }}
+      />
+
       {/* Breadcrumb */}
       <div
         style={{

lib/jsonLd.ts

@@ -0,0 +1,109 @@
+// Solid State — JSON-LD structured data builders.
+//
+// Emits schema.org SoftwareApplication markup for skill detail pages so
+// search engines can surface rich results.
+//
+// Honesty rules (mirror lib/skills.ts):
+//   - No aggregateRating / review block — we have no real ratings.
+//   - No install counts — schema has no honest field for them and we won't
+//     dress telemetry up as a review signal.
+//   - license is only emitted for real SPDX identifiers; undeclared /
+//     unknown / proprietary skills get no license URL.
+//   - Every value is pulled straight from the catalog record.
+
+import type { Platform, Skill } from "./types"
+import { bestPrice } from "./x402"
+
+const SITE_URL = "https://solidstate.cc"
+
+const PLATFORM_OS: Record<Platform, string> = {
+  claude: "Claude",
+  openclaw: "OpenClaw",
+  nemoclaw: "NemoClaw",
+  antigravity: "Google Antigravity",
+  generic: "Any agent runtime",
+}
+
+// SPDX ids we can honestly link to a canonical license page. Everything else
+// (undeclared, unknown, proprietary, source-available) is intentionally absent.
+const SPDX_LICENSES: ReadonlySet<string> = new Set([
+  "MIT",
+  "Apache-2.0",
+  "BSD-3-Clause",
+  "BSD-2-Clause",
+  "GPL-3.0",
+  "AGPL-3.0",
+  "MPL-2.0",
+  "ISC",
+  "MIT-0",
+  "Unlicense",
+  "CC0-1.0",
+])
+
+function licenseUrl(license: Skill["license"]): string | undefined {
+  return SPDX_LICENSES.has(license)
+    ? `https://spdx.org/licenses/${license}.html`
+    : undefined
+}
+
+function offers(skill: Skill): Record<string, unknown> | undefined {
+  const price = bestPrice(skill)
+  if (price.unit === "free") {
+    return {
+      "@type": "Offer",
+      price: "0",
+      priceCurrency: "USD",
+      availability: "https://schema.org/InStock",
+    }
+  }
+  // per-use and one-time both carry a real USD amount in the catalog.
+  if (price.unit === "per-use" || price.unit === "one-time") {
+    const numeric = skill.channels?.find((c) => c.unit === price.unit)?.price
+    // Legacy single-price skills (no channels) keep the amount on skill.price.
+    const fallback = typeof skill.price === "number" ? skill.price : undefined
+    const amount = typeof numeric === "number" ? numeric : fallback
+    if (typeof amount !== "number") return undefined
+    return {
+      "@type": "Offer",
+      price: String(amount),
+      priceCurrency: "USD",
+      availability: "https://schema.org/InStock",
+      ...(price.unit === "per-use" ? { description: "Per-use pricing via x402" } : {}),
+    }
+  }
+  return undefined
+}
+
+/**
+ * Build the schema.org SoftwareApplication object for a skill detail page.
+ * Returned plainly so the caller can JSON.stringify it into a
+ * <script type="application/ld+json"> tag.
+ */
+export function skillJsonLd(skill: Skill): Record<string, unknown> {
+  const license = licenseUrl(skill.license)
+  const offer = offers(skill)
+
+  return {
+    "@context": "https://schema.org",
+    "@type": "SoftwareApplication",
+    name: skill.name,
+    description: skill.description,
+    url: `${SITE_URL}/skills/${skill.slug}`,
+    applicationCategory: "DeveloperApplication",
+    operatingSystem: skill.platforms.map((p) => PLATFORM_OS[p]).join(", "),
+    datePublished: skill.createdAt,
+    author: {
+      "@type": skill.provenance === "first-party" ? "Organization" : "Person",
+      name: skill.author,
+    },
+    // "0.0.0" is the catalog's pre-release sentinel — omit rather than publish it.
+    ...(skill.version && skill.version !== "0.0.0"
+      ? { softwareVersion: skill.version }
+      : {}),
+    ...(skill.categories.length ? { applicationSubCategory: skill.categories.join(", ") } : {}),
+    ...(skill.tags.length ? { keywords: skill.tags.join(", ") } : {}),
+    ...(skill.repoUrl ? { codeRepository: skill.repoUrl } : {}),
+    ...(license ? { license } : {}),
+    ...(offer ? { offers: offer } : {}),
+  }
+}