---
title: "Semgrep Custom Pattern Builder"
description: "Builds custom Semgrep rules using the Semgrep pattern syntax and semgrep CLI. Generates YAML rule files with metavariable patterns, taint tracking, and autofix transformations."
verification: "security_reviewed"
source: "https://github.com/semgrep/semgrep"
category:
  - "Code Quality & Review"
framework:
  - "Codex"
tool_ecosystem:
  github_repo: "semgrep/semgrep"
  github_stars: 14794
---

# Semgrep Custom Pattern Builder

Builds custom Semgrep rules using the Semgrep pattern syntax and semgrep CLI. Generates YAML rule files with metavariable patterns, taint tracking, and autofix transformations.

## Installation

Choose whichever fits your setup:

1. Copy this skill folder into your local skills directory.
2. Clone the repo and symlink or copy the skill into your agent workspace.
3. Add the repo as a git submodule if you manage shared skills centrally.
4. Install it through your internal provisioning or packaging workflow.
5. Download the folder directly from GitHub and place it in your skills collection.

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/semgrep-custom-pattern-builder/)