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Semgrep Rule Creator

Checked
trailofbits·vlatest·security·CC-BY-SA-4.0

Generates Semgrep code rules to identify and fix coding errors automatically, boosting developer productivity and code quality.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add trailofbits/skills --skill semgrep-rule-creator -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

trailofbits

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned trailofbits/skills at 82fe822625.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
82fe822625
Manifest
plugins/semgrep-rule-creator/skills/semgrep-rule-creator/SKILL.md
Scanned
4 files, 564 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The semgrep-rule-creator skill allows you to generate Semgrep rules based on provided code examples or descriptions. It leverages AI to translate natural language requests into functional Semgrep rule definitions, which can then be used to identify patterns and enforce coding standards in your codebase. This helps automate the process of creating custom security and quality checks.

When to use it

  • Automating Rule Creation: You need a quick way to create Semgrep rules without manually writing complex queries.
  • Enforcing Coding Standards: You want to ensure consistency across a project by generating rules based on existing code examples.
  • Security Auditing: Generate custom rules to identify potential security vulnerabilities in your codebase.
  • Rapid Prototyping: Quickly experiment with different rule patterns and refine them before full implementation.

Key capabilities

  • Generates Semgrep rules from code examples.
  • Creates Semgrep rules based on natural language descriptions of desired patterns.
  • Automates the creation of custom security checks.
  • Supports enforcing coding standards within a codebase.

Example prompts

  • "Create a semgrep rule to find all instances where print is used directly in production code."
  • "Generate a Semgrep rule that flags any function longer than 50 lines."
  • “Write a Semgrep rule based on this code snippet: [code example]”

Tips & gotchas

  • The quality of the generated rules depends heavily on the clarity and specificity of the input provided. Vague descriptions may result in inaccurate or overly broad rules.