auditing-container-image-build-hardening SKILL.md skillA
auditing-container-image-build-hardening from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/auditing-container-image-build-hardening@git:20260823.e797ed0Pins git:20260823.e797ed0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/auditing-container-image-build-hardening/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260823.e797ed0, committed Aug 23, 2026
- Size
- 9,048 bytes
- Repository stars
- 26
- License
- MIT
Audit container image build definitions (Dockerfile, containerfile, and the compose or run config that sets runtime flags) for an image that ships over-privileged or carrying a secret, after multi-stage discards and deploy-time overrides are accounted for. Covers an image that runs as root, a secret baked into a layer, remote content pulled unpinned or unverified, a mutable or untagged base, an over-broad copy that pulls in local secrets and history, and a dangerous runtime request such as…
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
# Auditing container image build hardening: what survives into the shipped image A secret used in a build stage that a multi-stage build discards is not in the shipped image, and a root Dockerfile deployed under a non-root security context does not run as root. So the bug here is not an instruction in isolation; it is what survives into the final image layer and the runtime request that ships with it. This audit reads the build definition and asks, per concern, whether the image that ships runs unprivileged, carries no secret in any layer, pulls only pinned and verified content, and requests no dangerous runtime privilege. The checklist competitors flag the instruction; the finding that survives is the one a later build stage or a deploy-time override does not neutralize. Stay on the image build plane, and hand deploy-time privilege to the Kubernetes skill and cloud resources to the infrastructure skill. ## When to use - You have a Dockerfile or containerfile, or a compose or run config that sets container runtime flags. - An instruction sets the user, copies files, fetches remote content, pins a base, or requests a privilege. …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/auditing-container-image-build-hardening@sha256:558a9ebed7d36628The line at the top of this page pins the label git:20260823.e797ed0, 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_l6deoabjiry4ibn7)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 23, 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 (9048 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_l6deoabjiry4ibn7 GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-container-image-build-hardening GET https://markdownregistry.com/api/v1/blob/558a9ebed7d3662854b8d4bbc03bb180294280d37e453116e65ed36abbdeb232
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.