---
title: "Sigstore Cosign Container Signature Checker"
description: "Checks container trust with `cosign verify`, Rekor transparency log lookups, and OCI image reference inspection. Useful for agents that need to confirm whether an image was actually signed and recorded before it reaches a deployment pipeline."
verification: "security_reviewed"
source: "https://github.com/sigstore/cosign"
category:
  - "Security & Verification"
framework:
  - "Claude Code"
tool_ecosystem:
  github_repo: "sigstore/cosign"
  github_stars: 5776
---

# Sigstore Cosign Container Signature Checker

Checks container trust with `cosign verify`, Rekor transparency log lookups, and OCI image reference inspection. Useful for agents that need to confirm whether an image was actually signed and recorded before it reaches a deployment pipeline.

## Installation

Choose whichever fits your setup:

1. Copy this skill folder into your local skills directory.
2. Clone the repo and symlink or copy the skill into your agent workspace.
3. Add the repo as a git submodule if you manage shared skills centrally.
4. Install it through your internal provisioning or packaging workflow.
5. Download the folder directly from GitHub and place it in your skills collection.

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/sigstore-cosign-container-signature-checker/)