{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "98ae5849064a6db4ff6057144ef6dada65dcf7837500f1f9c03b0c4739e041da",
  "signature": "8x6GYZ1ROI6jgWPuIMoKWaOP6K8Kvf0nBiO8DF9cNN7rO2vqAG/LvbSNVIq1/X3vsAVc2DmSX6mZN82hdwiIDA==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T00:39:47.503Z",
  "slug": "ui-engineer",
  "version": "1.0.0",
  "filename": "ui-engineer-agent-plugin.zip",
  "bytes": 4071,
  "content_digest": "a68050abe677f9557324d017ef569e5473051443d1d9ea48b30c00db57f90e5d",
  "content_signature": "xzmwLTjblGk0aJrBRPKAZQwFhkjjpLrPZo/eh7zFVk7tZjZv+DZmC/WtZTSBVmRJVTsQqDP4dOk0yhWDw2KXBw==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "c75c92ebad8bc83b644a5bf4eed43ac37d434f76b4ecce44eb3f6e88b3f276ab"
    },
    {
      "path": "skills/ui-engineer/SKILL.md",
      "sha256": "78131fa0a070c2f414ead21e3856bd4bee4c9c0d2467a2c2ad70b1638aa16ad5"
    }
  ],
  "verify": {
    "public_key_url": "https://superagentskill.com/api/public/signing-key.pem",
    "instructions": "sha256 the downloaded .zip, compare with `sha256`, then verify the base64 `signature` as an Ed25519 signature over the ascii sha256 hex string using the public key. An extracted or repacked copy can still be verified via `content_digest` / `content_signature`. Helper: node scripts/verify-package-signature.mjs <file.zip> <signature.json> [public-key.pem]"
  }
}