cairo-vulnerability-scanner SKILL.md skillA
cairo-vulnerability-scanner from trailofbits/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add trailofbits/skills/cairo-vulnerability-scanner@git:20260831.6feac67Pins git:20260831.6feac67 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- trailofbits/skills
- Path
plugins/building-secure-contracts/skills/cairo-vulnerability-scanner/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260831.6feac67, committed Aug 31, 2026
- First version recorded
- Jan 26, 2026
- Size
- 13,109 bytes
- Repository stars
- 7,698
- License
- CC-BY-SA-4.0
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cairo/StarkNet Vulnerability Scanner
## 1. Purpose
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.
## 2. When to Use This Skill
- Auditing StarkNet smart contracts (Cairo)
- Reviewing L1-L2 bridge implementations
- Pre-launch security assessment of StarkNet applications
- Validating cross-layer message handling
- Reviewing signature verification logic
- Assessing L1 handler functions
## 3. Platform Detection
### File Extensions & Indicators
- **Cairo files**: `.cairo`
### Language/Framework Markers
```rust
// Cairo contract indicators
#[contract]
mod MyContract {
use starknet::ContractAddress;
#[storage]
struct Storage {
balance: LegacyMap<ContractAddress, felt252>,
}
#[external(v0)]
fn transfer(ref self: ContractState, to: ContractAddress, amount: felt252) {
// Contract logic
}
#[l1_handler]
fn handle_deposit(ref self: ContractState, from_address: felt252, amount: u256) {
// L1 message handler
…Read the whole file at its exact version.
How to install
mdr add trailofbits/skills/cairo-vulnerability-scanner@sha256:2d843b87efa0775eThe line at the top of this page pins the label git:20260831.6feac67, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_or7poudyrnxvcped)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jan 26, 2026 and Aug 31, 2026, about one every 54 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260831.6feac67 latest | 2026-08-31 | 6feac67 | 13,109 B | A | view · diff |
| git:20260820.7be90d6 | 2026-08-20 | 7be90d6 | 9,933 B | A | view · diff |
| git:20260819.9e06dc6 | 2026-08-19 | 9e06dc6 | 9,925 B | A | view · diff |
| git:20260129.650f6e3 | 2026-01-29 | 650f6e3 | 9,690 B | A | view · diff |
| git:20260126.7af5b1b | 2026-01-26 | 7af5b1b | 9,712 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13109 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
trailofbits/skills · 7,698 stars · license CC-BY-SA-4.0 · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_or7poudyrnxvcped GET https://markdownregistry.com/api/v1/resolve?ref=trailofbits/skills/cairo-vulnerability-scanner GET https://markdownregistry.com/api/v1/blob/2d843b87efa0775e1147e8fce1493288267b19a3aa86efd65df6eb3085725f97
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.