{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "d3022bb385d8ebc0fc93dacb40ccd50dd8adb33d3e829c9c8fd4a0826a781335",
  "signature": "mPeXhB0QtDFl8LJZWAn4gRuxcGd/1omeQf20E1VCeR0KYc32FPNG/Sv7YC1nLvOMFiCUIawp83ptcpGTgoOxAQ==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-24T01:07:15.769Z",
  "slug": "email-thread-summarizer",
  "version": "0.1.0",
  "filename": "email-thread-summarizer-agent-plugin.zip",
  "bytes": 3308,
  "content_digest": "5f25b8dc76c631f52033c9b22f1295b3b40ae3f77fb117bdab6fdd8f8a33f373",
  "content_signature": "0Kt+wungFm0XV5Hju4rFmscsP+M24UE7dqIuiNz+LpNd8ifwgcphjdncFJBJbiag/DtTlt3dNYLMTE0P2rx7AA==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "f7a401af06c9a1e80aa33d9bb2b39b9bed53c29945fd1ea75dcfe6e3bb13f194"
    },
    {
      "path": "skills/email-thread-summarizer/SKILL.md",
      "sha256": "7bf4f435d817dfad8f0f85b795272ff5c9c70e503b17eb7498f7addb939b19ab"
    }
  ],
  "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]"
  }
}