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    Dockerfile & Container Build Sanity Gate

    1

    The Dockerfile & Container Build Sanity Gate is an adversarial reviewer for Dockerfiles and container build files.

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    2 installsSecurity scanned
    Dockerfile & Container Build Sanity Gate

    Dockerfile & Container Build Sanity Gate

    Example session with this skill installed

    Review this Dockerfile: FROM node:latest
    COPY . .
    RUN npm install && npm run build
    ENV API_TOKEN=sk-live-abc123
    CMD ["node", "server.js"]

    • Read your context and instructions
    • Compiled the dockerfile & container

    VERDICT: BLOCK
    PRIVILEGE: risk - no USER directive, so the container runs as root.
    SIZE: bloated - single stage leaves npm and build tools in the final image.
    LAYERS: fragile - FROM node:latest is unpinned; COPY . . before install busts the cache on every code change.
    SECRETS: API_TOKEN in ENV is baked into a layer and visible to anyone who pulls the image - highest risk.
    HARDENING: no .dockerignore, no HEALTHCHECK, packages not minimized.
    TOP 3 FIXES: remove API_TOKEN from ENV and pass it at runtime; pin the base image and move COPY after dependency install; add a non-root USER plus a multi-stage build.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Reviewing a Dockerfile for root users and leaked secrets before building the imageChecking a teammate's Dockerfile in a pull request for bloat and fragile layersAuditing an oversized or slow-building image for missing hardening before it ships

    About this skill

    The Dockerfile & Container Build Sanity Gate is an adversarial reviewer for Dockerfiles and container build files. You paste a Dockerfile and it reads it the way a security-minded platform engineer would in code review — then returns a structured verdict. It does not rewrite your Dockerfile or generate one.

    It runs five passes — privilege and user, image size and bloat, layer order and pinning, secret and data leakage, and hardening best practices — and returns a structured PASS / FIX / BLOCK verdict with the highest-impact fixes first. It is built to be the last read before an image is built or pushed, when the author is too close to the file to spot a root process, a baked-in token, or a cache-busting layer.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

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    Click the path to copy it. Create the folder if it does not exist yet.

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    Security scanned

    Passed our 8-point scan before listing

    2 installs

    Downloaded by developers to date

    30-day refund

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    Trust & safety

    Security scanned

    Verified clean 3 months ago

    • Passed all security checks, Safe to install

    Listed3 months ago
    Updated2 days ago

    What's inside

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