{
  "spec": "sak-package-signature/v1",
  "algorithm": "ed25519",
  "sha256": "5576ec47cc54cdd6b3e7575bfbe898fca86a17d02d4dd51b68a9dd98f1b9e703",
  "signature": "6JO/vCqTukCMAvQnEa8QjTlbwpIuTXNY36rla0NLJjv1RQwsSNGq2KIJWGuXMdnMP01mrXeMzsHxeByElQXSCQ==",
  "signing_key_id": "0aff169ecb84607d",
  "signed_at": "2026-08-23T23:24:39.656Z",
  "slug": "mcp-server-builder",
  "version": "0.1.0",
  "filename": "mcp-server-builder-agent-plugin.zip",
  "bytes": 3365,
  "content_digest": "4b8dd3b6fb967ca1d5c4922bdd961099c005ee7b8fcdddd74d61e1ab3621eb1b",
  "content_signature": "V1MfmvLdV4gnIH6zWiv69sRXRyQIsSasDcYRClyZ3q8jb2fGZHqQM5nqAFjTyfxJFxC5kv9+P7WLH5MYtx2dBA==",
  "files": [
    {
      "path": "mcp.json",
      "sha256": "a4ec0149cccb566b6c4b6d8413290229819ff2adcfa9eb5387c3f91d31103a57"
    },
    {
      "path": "plugin.json",
      "sha256": "fd56ef6a51eb66480451d9101d2ad7101c121078cd4105b96cc6da29551bd35a"
    },
    {
      "path": "skills/mcp-server-builder/SKILL.md",
      "sha256": "f92a669a5edd0f1da29bb48ab6fd54768d56906117cc3dfcedd7c52c8abb080c"
    }
  ],
  "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]"
  }
}