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.
npx skills add sourav15mukherjee/skillforge-free-skills --skill dockerfile-optimizergit clone --depth 1 https://github.com/sourav15mukherjee/skillforge-free-skillsWrote 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.
[](https://agentmods.dev/skills/sourav15mukherjee/skillforge-free-skills/dockerfile-optimizer)<a href="https://agentmods.dev/skills/sourav15mukherjee/skillforge-free-skills/dockerfile-optimizer"><img src="https://agentmods.dev/badge/skills/sourav15mukherjee/skillforge-free-skills/dockerfile-optimizer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sourav15mukherjee/skillforge-free-skills/dockerfile-optimizer"><img src="https://agentmods.dev/badge/skills/sourav15mukherjee/skillforge-free-skills/dockerfile-optimizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00063 | $0.01146 |
| Opus 5 | $0.00032 | $0.00573 |
| Sonnet 5 | $0.00013 | $0.00229 |
| Haiku 4.5 | $0.00006 | $0.00115 |
Grade A, and why
dockerfile-optimizer 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 10d 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.
- Using ADD for remote URLs instead of RUN curl How it starts
The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dockerfile Optimizer
Analyze Dockerfiles across four dimensions and produce prioritized, actionable optimizations with estimated impact.
Workflow
-
Locate and read the Dockerfile(s) Search for Dockerfile, Dockerfile.*, or *.dockerfile in the project. Read all found files. Also check for .dockerignore and docker-compose.yml for context.
-
Pass 1 — Image Size Analysis Check for:
- Using slim/alpine/distroless base images where appropriate
- Combining RUN commands to reduce layers
- Cleaning package manager caches (apt clean, apk --no-cache, pip --no-cache-dir)
- Multi-stage build usage to exclude build dependencies
- Unnecessary files copied into the image (check .dockerignore)
- Using COPY instead of ADD (ADD has implicit tar extraction)
- Installing only production dependencies (npm ci --omit=dev, pip install --no-dev) Score: 1-10. Estimate total size reduction in MB/GB.
-
Pass 2 — Layer Caching Analysis Check for:
- Ordering instructions from least to most frequently changing
- Separate dependency install step before COPY . .
- Using BuildKit cache mounts for package managers
- Avoiding COPY . . before dependency installation
- Using .dockerignore to prevent cache invalidation Score: 1-10. Estimate rebuild time improvement.
-
Pass 3 — Security Hardening Check for:
- Running as non-root user (USER directive)
- Using specific image tags, not :latest
- No secrets in ENV or ARG that leak into final image
- No unnecessary ports exposed
- Using read-only filesystem where possible
- Scanning for known CVEs in base image
- Dropping capabilities (CAP_DROP ALL)
- Using HEALTHCHECK Score: 1-10. List specific vulnerabilities found.
-
Pass 4 — Build Speed Check for:
- BuildKit syntax enabled (# syntax=docker/dockerfile:1)
- Parallel build stages where possible
- Using --mount=type=cache for apt/pip/npm caches
- Avoiding unnecessary .dockerignore exclusions that force full rebuilds
- Using ADD for remote URLs instead of RUN curl Score: 1-10. Estimate build time savings.
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.
- 10d ago First seen · 131 lines · 63 tokens per session scan A 63ffaffacb27
dockerfile-optimizer is a skill published in the GitHub repository sourav15mukherjee/skillforge-free-skills (5 stars, last pushed 5mo ago), licensed MIT. It adds 63 tokens to every session and 1,146 once invoked, about $0.0003 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 2026-08-31.
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