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Scfw

Category: Security  ·  Sub-category: network-security  ·  Last updated:
type:review
Set up and use Datadog's Supply-Chain Firewall (scfw) to block known-malicious npm/PyPI/Poetry packages at install time. Two modes — setup (pipx-install scfw, run `scfw configure` to route pip/npm/poetry through the firewall via shell aliases, smoke-test the pipeline with a dry run, and optionally install a Claude Code PreToolUse hook so the agent's own installs are vetted too) and review (confirm the firewall is still wired, read the local JSON Lines log for recent blocks/warnings, run `scfw audit` on installed packages, answer "did scfw block/see package X"). Client-side, install-time gate for a single developer machine — complements CI-side scanning, doesn't replace it. User-triggered only — activate when the user invokes `/security:scfw`, `/security:scfw setup`, `/security:scfw review`, or `/security:scfw audit`.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

You are setting up and operating [Supply-Chain Firewall](https://github.com/DataDog/supply-chain-firewall) (scfw), Datadog's open-source tool that blocks known-malicious npm, PyPI, and Poetry packages before they install. It's the closest open-source analog to a registry-side "malicious package firewall": a client-side gate that inspects the full set of targets a package-manager command would pull, checks them against Datadog's malicious-packages dataset + OSV.dev (plus a recent-publish warning heuristic), and auto-blocks known-malicious installs / prompts on warnings before handing off to…

What this skill does

Scfw is a community-contributed Claude Code skill in the network-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/scfw/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Scfw Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 159,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/scfw
curl -L https://claudskills.com/skills/scfw/SKILL.md \
  -o ~/.claude/skills/scfw/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/scfw/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/scfw/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\scfw\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Scfw Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/scfw/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Scfw skill do?
Set up and use Datadog's Supply-Chain Firewall (scfw) to block known-malicious npm/PyPI/Poetry packages at install time. Two modes — setup (pipx-install scfw, run `scfw configure` to route pip/npm/poetry through the firewall via shell aliases, smoke-test the pipeline with a dry run, and optionally install a Claude Code PreToolUse hook so the agent's own installs are vetted too) and review (confirm the firewall is still wired, read the local JSON Lines log for recent blocks/warnings, run `scfw audit` on installed packages, answer "did scfw block/see package X"). Client-side, install-time gate for a single developer machine — complements CI-side scanning, doesn't replace it. User-triggered only — activate when the user invokes `/security:scfw`, `/security:scfw setup`, `/security:scfw review`, or `/security:scfw audit`.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Scfw skill?
Use Scfw when your Claude Code task falls under the Security category — specifically in the network security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Scfw" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Scfw skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Scfw is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
zcaceres. (2026). Scfw [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/scfw/
BibTeX
@misc{scfw-2026,
  author    = {zcaceres},
  title     = {Scfw [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/scfw/}
}

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Security scan

Grade A · scanned 2026-07-25 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/scfw/#security)

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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