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10 Repos That Make Claude Code 10x Safer (Security Audits, Secret Scanners, Skill Checkers)

9 minute readUpdated October 2026Explore more

TL;DR

Claude writes code fast. These 10 free GitHub repos make sure that code is safe before it ships. Three of them audit and review code (Cloudflare's Security Audit Skill, Anthropic's Claude Code Security Review, Trail of Bits Skills). Two check skills before you install them (NVIDIA's SkillSpector and the Agent Skills Registry). Two catch leaked API keys (Gitleaks and TruffleHog). Semgrep finds bug patterns across your whole repo, Cybersecurity Skills adds 817 security skills, and Claude Review Loop makes a second AI review Claude's work until it passes. Each section has the GitHub link, live star count and the install steps from the repo's own README.

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The 10 repos that make Claude Code 10x safer

Star counts below were pulled from GitHub on October 2, 2026, so they will be higher by the time you read this. The list covers four jobs: audit your code, check skills before you install them, catch leaked API keys and review every change. You don't need all 10. Start with the one that matches the risk you worry about most.

1. Security Audit Skill: Cloudflare-grade audits of your code

cloudflare/security-audit-skill

23,772 stars on October 2, 2026. MIT license.

What it does: a skill from Cloudflare that runs a multi-phase security audit on your codebase. Every finding is independently verified before it lands in the report, so you get fewer false alarms.

How to install it:

bashnpx skills add https://github.com/cloudflare/security-audit-skill --skill security-audit

Add `--global` to install it for every project. Then open Claude Code in your project and ask:

promptsecurity audit this codebase

2. SkillSpector: check any skill before you install it

NVIDIA/SkillSpector

19,106 stars on October 2, 2026. Apache 2.0 license.

What it does: NVIDIA's scanner for AI agent skills. It looks for malicious patterns, prompt injection, data exfiltration and supply-chain risks in Claude Code, Codex and MCP skills before you install them.

How to install it: you need uv (a Python tool installer).

bashuv tool install git+https://github.com/NVIDIA/skillspector.git

Then scan a skill folder. Setting the provider to claude_cli uses your existing Claude Code login, so no extra API key is needed:

bashexport SKILLSPECTOR_PROVIDER=claude_cli
skillspector scan ./my-skill/

3. Claude Code Security Review: a security check on every pull request

anthropics/claude-code-security-review

6,290 stars on October 2, 2026. MIT license. Made by Anthropic.

What it does: Anthropic's GitHub Action that uses Claude to review every pull request for security problems and leaves comments on the PR.

Fastest way to try it: Claude Code already ships the same review as a slash command. Type this in any project with changes:

prompt/security-review

To run it on every pull request: add this file as .github/workflows/security.yml in your repo, and add your Claude API key as a repo secret named CLAUDE_API_KEY.

yamlname: Security Review

permissions:
  pull-requests: write
  contents: read

on:
  pull_request:

jobs:
  security:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha || github.sha }}
          fetch-depth: 2

      - uses: anthropics/claude-code-security-review@main
        with:
          comment-pr: true
          claude-api-key: ${{ secrets.CLAUDE_API_KEY }}

4. Cybersecurity Skills: 817 security skills for your agent

mukul975/Anthropic-Cybersecurity-Skills

33,716 stars on October 2, 2026. Apache 2.0 license. Community project, not made by Anthropic.

What it does: 817 structured cybersecurity skills across 29 security domains, mapped to frameworks like MITRE ATT&CK and NIST CSF 2.0. Works with Claude Code, Codex, Cursor, Gemini CLI and more.

How to install it:

bashnpx skills add mukul975/Anthropic-Cybersecurity-Skills

5. Gitleaks: catch a leaked API key before it costs you money

gitleaks/gitleaks

29,620 stars on October 2, 2026. MIT license.

What it does: scans your code and your whole git history for secrets like API keys, passwords and tokens. A leaked key that someone finds can run up a real bill on your account.

How to install and run it (Mac):

bashbrew install gitleaks
gitleaks git -v

Or scan a folder that is not a git repo with `gitleaks dir -v path/to/folder`. The README also shows how to run it as a pre-commit hook, so a key never gets committed in the first place.

promptInstall Gitleaks, run it on this repo, and explain each finding in plain English. For any real secret, tell me how to rotate it.

6. TruffleHog: find out which leaked keys are actually live

trufflesecurity/trufflehog

28,244 stars on October 2, 2026. AGPL 3.0 license.

What it does: finds leaked credentials and then verifies them, so you know which keys still work and need rotating right now.

How to install and run it (Mac):

bashbrew install trufflehog
trufflehog git file://. --results=verified,unknown

To scan plain files or folders, use `trufflehog filesystem path/to/dir`.

7. Semgrep: catch bug patterns across your whole repo in seconds

semgrep/semgrep

16,843 stars on October 2, 2026. LGPL 2.1 license.

What it does: fast static analysis for many programming languages. It finds risky code patterns, like injection bugs, across your entire codebase without running it.

How to install it:

bashbrew install semgrep
# or: python3 -m pip install semgrep

Then go to your project folder and run `semgrep ci`. The README lists `semgrep login` as optional: it is free and unlocks extra rules and dependency scanning.

promptRun Semgrep on this project, group the findings by severity, and fix the high ones first. Show me each diff before applying it.

8. Trail of Bits Skills: pro auditor techniques for Claude Code

trailofbits/skills

7,346 stars on October 2, 2026. CC BY-SA 4.0 license.

What it does: a Claude Code plugin marketplace from Trail of Bits, one of the best-known security research firms. The skills cover security analysis, vulnerability detection and audit workflows.

How to install it: inside Claude Code, type:

prompt/plugin marketplace add trailofbits/skills

Then type `/plugin menu` and pick the skills you want.

9. Agent Skills Registry: install only skills that were already checked

tech-leads-club/agent-skills

7,023 stars on October 2, 2026.

What it does: a curated registry of agent skills. Every skill is scanned with Snyk Agent Scan before it is published, and installs are locked with content hashes. It works with Claude Code, Cursor, Copilot and more.

How to install it: run this and follow the wizard. It asks which skills you want, which agents to install them for, and whether to install globally or just for this project.

bashnpx @tech-leads-club/agent-skills

Its security-best-practices skill is a good first pick: it reviews code for your language and framework and suggests secure fixes.

10. Claude Review Loop: Claude's code gets reviewed until it passes

hamelsmu/claude-review-loop

724 stars on October 2, 2026. The smallest repo on this list, from Hamel Husain.

What it does: a Claude Code plugin that hands Claude's finished work to OpenAI's Codex for an independent review, then has Claude address the findings. A second model catches what the first one missed.

How to install it: you need jq (`brew install jq`) and the Codex CLI (`npm install -g @openai/codex`). Then:

bashclaude plugin marketplace add hamelsmu/claude-review-loop
claude plugin install review-loop@hamel-review

Start a task with the loop on:

prompt/review-loop Add user authentication with JWT tokens and test coverage

Quick start

  1. 1Run Gitleaks on your projects today. A leaked key is the most expensive mistake on this list.
  2. 2Type /security-review in Claude Code before your next push. It is already installed.
  3. 3Before you install any new skill, scan it with SkillSpector or install from the Agent Skills Registry.
  4. 4Add Cloudflare's Security Audit Skill and run a full audit on anything that handles logins or payments.
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Common questions

  • Are these 10 repos free?

    Yes. All 10 are free and open source. Some use AI to do their work: Claude Code Security Review uses your Claude API credits, SkillSpector's deeper scan uses your Claude usage, and Claude Review Loop runs reviews on your Codex account.

  • Which one should I install first?

    Gitleaks. It installs with one command, scans your whole git history in seconds, and catches the mistake that costs the most: a leaked API key.

  • Do I need to be a security expert to use these?

    No. Run the tool, then ask Claude Code to explain each finding in plain English and fix the important ones. Ask it to show you each change before applying it.

  • Is the Cybersecurity Skills repo made by Anthropic?

    No. Despite the name, it is a community project. The official Anthropic repo on this list is Claude Code Security Review.

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