semgrep-rule-creator

Semgrep Rule Creator

Create production-quality Semgrep rules for detecting bug patterns and security vulnerabilities.

Author: Maciej Domanski

Skills Included

Skill	Purpose
semgrep-rule-creator	Guide creation of custom Semgrep rules with testing

When to Use

Use this skill when you need to:

• Create custom Semgrep rules for detecting specific bug patterns
• Write rules for security vulnerability detection
• Build taint mode rules for data flow analysis
• Develop pattern matching rules for code quality checks

What It Does

• Guides test-driven rule development (write tests first, then iterate)
• Analyzes AST structure to help craft precise patterns
• Supports both taint mode (data flow) and pattern matching approaches
• Includes comprehensive reference documentation from Semgrep docs
• Provides common vulnerability patterns by language

Prerequisites

• Semgrep installed (pip install semgrep or brew install semgrep)

Installation

/plugin install trailofbits/skills/plugins/semgrep-rule-creator

Related Skills

• semgrep-rule-variant-creator - Port existing Semgrep rules to new target languages
• static-analysis - General static analysis toolkit with Semgrep, CodeQL, and SARIF parsing
• variant-analysis - Find similar vulnerabilities across codebases