container-security

container-security is a skill for Claude Code, Codex from snyk/studio-recipes. It costs 88 tokens per session (2,675 once invoked), scanned A, original, Apache-2.0.

A security scanner for container images, which are packaged applications designed to run in containers. It checks operating-system packages, application dependencies, and Dockerfile practices.

In plain words
What is it for?
Use it to scan local images, registry images, or image archives, identify vulnerabilities, and get guidance for fixing the Dockerfile or image.
Why use it?
It helps find known security problems and unsafe image settings before a container is deployed.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/snyk/studio-recipes/container-security
Any agent
npx skills add snyk/studio-recipes --skill container-security
Clone the repo
git clone --depth 1 https://github.com/snyk/studio-recipes

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for container-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/snyk/studio-recipes/container-security.svg)](https://agentmods.dev/skills/snyk/studio-recipes/container-security)
Your own site
<a href="https://agentmods.dev/skills/snyk/studio-recipes/container-security"><img src="https://agentmods.dev/badge/skills/snyk/studio-recipes/container-security.svg" alt="Measured on agentmods" height="20"></a>
Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,675 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00088 $0.02675
Opus 5 $0.00044 $0.01337
Sonnet 5 $0.00018 $0.00535
Haiku 4.5 $0.00009 $0.00267

Measured 5d ago against content hash eed5d55b1d15, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

container-security scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

RUN apt-get install -y --no-install-recommends curl
command_directives/synchronous_remediation/skills/container-security/SKILL.md · 360 lines

How it starts

The opening of the file, as written. The whole thing — 360 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Container Security Scanner

Guide for comprehensive container image security analysis, covering OS vulnerabilities, application dependencies, and Dockerfile best practices.

Core Principle: Secure containers from the base up - secure base image, minimal packages, no vulnerabilities.


Quick Start

1. Identify image to scan (local, registry, or archive)
2. Run snyk_container_scan with image name
3. Analyze results: OS packages + application deps
4. Provide remediation guidance
5. Optionally fix Dockerfile issues

Phase 1: Image Identification

Step 1.1: Parse User Input

Extract the image reference from the user's request (e.g., myapp:latest, nginx:1.25, gcr.io/project/app:v1, sha256:abc123..., or ./image.tar).

Step 1.2: Determine Scan Scope

Ask or infer:

  • App vulns: Include application dependencies? (default: yes for v1.1090.0+)
  • Base image: Separate base image vulns? (useful for understanding what you control)
  • Platform: For multi-arch images, which platform? (linux/amd64, linux/arm64)

Phase 2: Execute Scan

Step 2.1: Basic Scan

Invoke mcp_snyk_snyk_container_scan with:

  • image: the image name or path

Step 2.2: Advanced Scan Options

For more comprehensive analysis, invoke mcp_snyk_snyk_container_scan with:

  • image: the image name
  • file: path to Dockerfile (enables better remediation advice)
  • app_vulns: true (scan app dependencies)
  • severity_threshold: "high" (filter to high/critical only)

Step 2.3: Base Image Analysis

To isolate inherited vs. added vulnerabilities:

  1. Invoke mcp_snyk_snyk_container_scan with image and exclude_base_image_vulns: true — shows only vulnerabilities your layers added.
  2. Invoke again without that flag — shows the full picture including base OS.

Phase 3: Analyze Results

Step 3.1: Categorize Findings

Source Description Your Control
Base OS packages Installed by base image Change base image
Additional OS packages Installed via apt/yum Update or remove
App dependencies Node modules, Python packages Update versions
Dockerfile issues Misconfigurations Direct fix

Read the full file on GitHub · 360 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 360 lines · 88 tokens per session scan A eed5d55b1d15

Subscribe to this mod's changes

container-security is a skill published in the GitHub repository snyk/studio-recipes (62 stars, last pushed 2d ago), licensed Apache-2.0. It adds 88 tokens to every session and 2,675 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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