sigstore-cosign

sigstore-cosign is a Secrets & supply chain skill for AI agents, published by claude-dev-suite in the claude-dev-suite repository on GitHub. Skillspace rates sigstore-cosign F (45/100) and the safety scan rated it risky; the rating is based on static analysis only.

Sigstore — keyless signing for software artifacts using OIDC identities and short-lived certificates from Fulcio CA, with Rekor transparency log. Cosign is the CLI for signing/verifying containers, OCI artifacts, blobs, and attestations (SBOMs, provenance). Covers GitHub Actions OIDC integration, policy enforcement (cosign-policy-controller, Kyverno), Notary v2 vs Cosign, and supply-chain attestation patterns (SLSA). USE WHEN: user mentions "Sigstore", "Cosign", "Fulcio", "Rekor", "keyless signing", "OIDC signing", "cosign sign", "cosign verify", "SLSA provenance", "OCI artifact signing", "attestation cosign" DO NOT USE FOR: GPG-style signing - use GPG-specific docs DO NOT USE FOR: Code signing certificates (Apple Developer ID, Authenticode) - platform-specific DO NOT USE FOR: Reproducible builds spec - use `infrastructure/reproducible-builds`

Grade
F
Quality
45 / 100
Safety
Risky
GitHub stars
24

Unproven: rated by static analysis only, not yet compared head-to-head.

This rating describes the version of the repository we crawled; it may have changed since.

View source on GitHubclaude-dev-suite/claude-dev-suite

Our review

Architecture
77 / 100
Maturity
Basic: a single SKILL.md
Security scan
High-risk patterns
License
MIT
Adoption
Adopted by 0 other repositories, in 2 collections

What the scanner flagged

  • references sensitive credential env
  • mentions secrets in text

Not checked yet

  • Not judged on the rubric yet (not a contender in its category)
  • No blind task eval yet
  • Scope (portable / vendor / repo-internal) not assessed; only the top of each category is read for scope
  • Sibling files (scripts, references) not fetched; security scan covers SKILL.md only

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