{
  "contract": "tessli.public-source.v2",
  "canonicalPath": "/resources/21st-dev",
  "representations": {
    "json": "/resources/21st-dev/profile.json",
    "markdown": "/resources/21st-dev/profile.md"
  },
  "source": {
    "id": "resource-28acba4a9d55",
    "slug": "21st-dev",
    "name": "21st.dev",
    "purpose": "Community-built React and Tailwind components designed for AI-assisted development",
    "providerUrl": "https://21st.dev",
    "category": "ui-libraries",
    "sourceType": "implementation-library",
    "profileLevel": "profiled",
    "useWhen": [
      "component-discovery",
      "agent-ui-implementation"
    ],
    "whatToExplore": [
      "component-library",
      "code-implementation",
      "mcp-integration",
      "component",
      "code",
      "documentation"
    ],
    "accessRoutes": [
      {
        "kind": "cli",
        "preferred": true,
        "auth": "unknown",
        "agentAction": "Use the documented CLI workflow in the target project."
      },
      {
        "kind": "mcp",
        "preferred": false,
        "auth": "none",
        "agentAction": "Connect an MCP client to the recorded 21st.dev endpoint.",
        "url": "https://21st.dev/mcp"
      }
    ],
    "importantLimitations": [
      "Free semantic search; paid tiers for advanced agent generation"
    ],
    "alternatives": [
      {
        "slug": "ant-design",
        "name": "Ant Design",
        "canonicalPath": "/resources/ant-design",
        "providerUrl": "https://ant.design",
        "differentiator": "Recorded task fit: Enterprise Dashboard."
      },
      {
        "slug": "headless-ui",
        "name": "Headless UI",
        "canonicalPath": "/resources/headless-ui",
        "providerUrl": "https://headlessui.com",
        "differentiator": "Recorded task fit: Accessible Ui Implementation."
      }
    ]
  },
  "diagnostics": {
    "coverage": {
      "level": "profiled",
      "profileStatus": "verified",
      "recordedVerifiedAt": "2026-07-31",
      "confidence": "certain",
      "freshnessStatus": "current"
    },
    "evidenceCount": 1,
    "governance": {
      "defaultPersistence": "persistent",
      "assetRedistribution": "allowed",
      "sourceAttribution": "recommended",
      "userCredentialRequired": false,
      "termsReviewRequired": false
    }
  },
  "boundaries": [
    "Repository intelligence is not live-provider verification.",
    "Revalidate provider access, pricing, licensing, terms, availability, and time-sensitive claims.",
    "Tessli classifications are research guidance, not provider claims or universal rankings.",
    "No browser-local Board, Saved, account, cookie, or credential data is included."
  ]
}