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Developer builds open-source tool to verify and sign AI skill packages

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A developer has released Skillerr, an open-source CLI and protocol designed to add cryptographic verification to AI skill packages used by agents in tools like Claude, Cursor, and Codex. The project addresses a growing supply-chain concern: AI skills are typically plain Markdown files with no way to confirm their author, integrity, or whether they have been tampered with. Skillerr assigns each packaged skill a SHA-256 hash and structured contract detailing its permissions, inputs, and outputs, and rejects execution if any file has been altered after packaging. Authors can optionally sign their skills and anchor a package digest in Sigstore's public transparency log for independent verification. The tool is available on GitHub and the developer is actively inviting the community to test it for security vulnerabilities.

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Developer builds open-source tool to verify and sign AI skill packages · ShortSingh