# Cairo Vulnerability Scanner (agent skill)

> Cairo Vulnerability Scanner is an agent skill (a SKILL.md file) from trailofbits/skills. Scans Cairo/StarkNet smart contracts for 6 critical vulnerabilities including felt252 arithmetic overflow, L1-L2 messaging issues, address conversion problems, and signature replay. It works with Claude Code and Codex and has 7,400 GitHub stars across a repository of 4 listed skills.

Scans Cairo/StarkNet smart contracts for 6 critical vulnerabilities including felt252 arithmetic overflow, L1-L2 messaging issues, address conversion problems, and signature replay. Use when auditing StarkNet projects. Systematically scan Cairo smart contracts on StarkNet for platform-specific security vulnerabilities related to arithmetic, cross-layer messaging, and cryptographic operations. This skill encodes 6 critical vulnerability patterns unique to Cairo/StarkNet ecosystem.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/trailofbits/skills |
| Skill path | plugins/building-secure-contracts/skills/cairo-vulnerability-scanner/SKILL.md |
| Skill name | cairo-vulnerability-scanner |
| GitHub stars | 7,400 |
| Installs on skills.sh | not listed |
| License | CC-BY-SA-4.0 |
| Skills in repo | 4 |
| Plugin marketplace | trailofbits |
| Official | yes |
| Works with | Claude Code, Codex |
| Category | Security |
| Last commit | Sep 28, 2026 |

## When it triggers

- Use when auditing StarkNet projects.

## Add this skill

### Claude Code

```sh
/plugin marketplace add trailofbits/skills
/plugin install building-secure-contracts@trailofbits
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/trailofbits/skills.git
cp -r skills/plugins/building-secure-contracts/skills/cairo-vulnerability-scanner .agents/skills/cairo-vulnerability-scanner   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/trailofbits/skills.git
cp -r skills/plugins/building-secure-contracts/skills/cairo-vulnerability-scanner .cursor/skills/cairo-vulnerability-scanner   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

---

Canonical page: https://appsgit.com/skills/trailofbits-cairo-vulnerability-scanner
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