{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "409772e58b90701a07080d9da48034f34782971e2830d286600f8bd2c27c375a",
  "signature": "JCbgSEdzzWK3+WwtJpSeh7O5Rs/p4vmeO2CUp9MqDRSU/CHGRD6GkdAyuu2LuLmFBr1xMMUAefMufQ90vpZMBg==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-10-08T16:25:45.007Z",
  "slug": "sendgrid-mailer",
  "version": "0.1.0",
  "filename": "sendgrid-mailer-agent-plugin.zip",
  "bytes": 3201,
  "content_digest": "dd97af68b10bbc8662dfb31c41639bed2f83af4d1e75d3b8e1836661bcf0292d",
  "content_signature": "vR1OVdMKuLfXbhw9NmdYqx5Nilr5dcS6vM3jVY2ZucRLC2kDoGAAwXnPgltMMuRJPyuI4yPR4Z7YPkL0mhgdCA==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "6b6ee3ddd6e82bae8f63888013a0214ea4f8d5ab10bbf5db4f4d7976df5b5e61"
    },
    {
      "path": "skills/sendgrid-mailer/SKILL.md",
      "sha256": "421af4016c6baaf05d8e689f5ecb5014733c8695053b124cf077d6884adee98b"
    }
  ],
  "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]"
  }
}