What types of race conditions can this skill detect?

It identifies TOCTOU (Time-of-Check Time-of-Use), double-spend bugs, non-atomic counters, file system races, and shared state issues across async boundaries.

Which programming languages are supported?

While it can analyze any code through Claude's reasoning, it has specific scanner integrations for Go (go vet), Python (Bandit), and broad multi-language support via Semgrep.

How does it help with database transactions?

It checks for missing synchronization, improper isolation levels, and check-then-act patterns that could lead to data corruption or unauthorized financial transfers.

Can it suggest fixes for the vulnerabilities it finds?

Yes, every finding includes a concrete fix with a code diff and an exploit scenario to help developers understand and resolve the security risk.

Why is static analysis better for finding race conditions?

Race conditions depend on precise timing and are notoriously hard to catch in runtime tests; static analysis identifies the underlying logic flaws that create the race window.

Race Condition Security Auditor

Name: Race Condition Security Auditor
Author: florianbuetow

byflorianbuetow

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Security & Testing

Analyzes source code to detect and remediate complex concurrency vulnerabilities like TOCTOU, double-spend bugs, and non-atomic operations.

The Race Condition Security Auditor is a specialized tool for Claude Code designed to identify elusive timing-based vulnerabilities that often escape traditional testing. It performs deep static analysis and traces shared state across asynchronous boundaries to find check-then-act patterns, file system races, and improper database transaction isolation. By combining automated scanners like Semgrep, Go Vet, and Bandit with Claude's advanced reasoning, it provides high-fidelity security findings with actionable remediation steps, exploit scenarios, and CWE mapping.

Key Features

01Detection of TOCTOU (Time-of-Check Time-of-Use) vulnerabilities in file systems and business logic.

02Identification of double-spend and financial logic errors in database transactions.

036 GitHub stars

04Integration with Semgrep, Go Vet, and Bandit for multi-language security scanning.

05Analysis of shared mutable state across async/await boundaries and parallel iterations.

06Automated generation of exploit scenarios and code fixes with context-aware diffs.

Use Cases

01Auditing financial and payment processing code for transaction atomicity and row-level locking.

02Securing file-handling logic against symlink attacks and file system race conditions.

03Validating thread safety and state management in high-concurrency Node.js, Go, or Python applications.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add florianbuetow/claude-code race-conditions

For use in Claude.ai and ChatGPT

Download Skill