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Create Semgrep Rule

Category: Security  ·  Sub-category: appsec-tools  ·  Last updated:
Create custom Semgrep rules for vulnerability detection. Use when writing new rules for specific vulnerability patterns, creating org-specific detections, or building rules for novel attack vectors discovered during bug bounty hunting.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Expert workflow for creating high-quality, low-false-positive Semgrep rules for security vulnerability detection.

What this skill does

Create Semgrep Rule is a community-contributed Claude Code skill in the appsec-tools sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/create-semgrep-rule/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when writing new rules for specific vulnerability patterns, creating org-specific detections, or building rules for novel attack vectors discovered during bug bounty hunting.

Who uses this skill

The Create Semgrep Rule 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 115,000+ 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/create-semgrep-rule
curl -L https://claudskills.com/skills/create-semgrep-rule/SKILL.md \
  -o ~/.claude/skills/create-semgrep-rule/SKILL.md

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

Skills live at ~/.claude/skills/create-semgrep-rule/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\create-semgrep-rule\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 Create Semgrep Rule Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/create-semgrep-rule/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Create Semgrep Rule skill do?
Create custom Semgrep rules for vulnerability detection. Use when writing new rules for specific vulnerability patterns, creating org-specific detections, or building rules for novel attack vectors discovered during bug bounty hunting.
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 Create Semgrep Rule skill?
Use Create Semgrep Rule when your Claude Code task falls under the Security category — specifically in the appsec tools 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 Create Semgrep Rule" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Create Semgrep Rule 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. Create Semgrep Rule 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
org. (2026). Create Semgrep Rule [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/create-semgrep-rule/
BibTeX
@misc{create-semgrep-rule-2026,
  author    = {org},
  title     = {Create Semgrep Rule [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/create-semgrep-rule/}
}

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Security scan

Grade A · scanned 2026-06-13 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (execution), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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

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

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