github-actions-hardening SKILL.md skillA
github-actions-hardening from github/awesome-copilot is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add github/awesome-copilot/github-actions-hardening@git:20260616.df56634Pins git:20260616.df56634 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- github/awesome-copilot
- Path
skills/github-actions-hardening/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260616.df56634, committed Jun 16, 2026
- Size
- 9,852 bytes
- Repository stars
- 40,941
- License
- MIT
Security hardening reviewer for GitHub Actions workflow files (.github/workflows/*.yml). Reasons about the Actions threat model that pattern matchers and general code linters miss — untrusted-input script injection, privileged triggers running fork code, mutable action references, and over-scoped tokens. Use this skill when asked to review, audit, harden, or secure a GitHub Actions workflow, when writing a new workflow, or for any request like "is this workflow safe?…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# GitHub Actions Hardening
A focused security reviewer for GitHub Actions workflows. It reasons about the *Actions-specific*
threat model — where trust boundaries live in trigger types, token scopes, and string
interpolation — rather than the application-code vulnerabilities a general security scanner looks
for. Most workflow risks are invisible to language linters because the dangerous code is the YAML
itself and the way GitHub expands `${{ }}` expressions into a shell before your script runs.
## When to Use This Skill
Use this skill when the request involves:
* Reviewing, auditing, or hardening any file under `.github/workflows/`
* Authoring a new workflow and wanting it secure by default
* A workflow that uses `pull_request_target`, `workflow_run`, or `issue_comment` triggers
* Questions about `GITHUB_TOKEN` permissions or the `permissions:` key
* Pinning actions to commit SHAs vs tags vs branches
* Handling untrusted input (issue titles, PR bodies, branch names, commit messages) in `run:` steps
* OIDC / cloud authentication from Actions, or secret handling in CI
* Self-hosted runners on public repositories
…Read the whole file at its exact version.
How to install
mdr add github/awesome-copilot/github-actions-hardening@sha256:31a8e7483d978e62The line at the top of this page pins the label git:20260616.df56634, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_v63lahegioknenrf)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9852 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
github/awesome-copilot · 40,941 stars · license MIT · pushed 2026-11-09 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_v63lahegioknenrf GET https://markdownregistry.com/api/v1/resolve?ref=github/awesome-copilot/github-actions-hardening GET https://markdownregistry.com/api/v1/blob/31a8e7483d978e6267941edefebbe42aaa946bb3d43c9095aa3db343d4a8ff06
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.