OWASP Security Skill for Claude Code

A Claude Code skill providing the latest OWASP security best practices (2025-2026) for developers building secure applications.

Quick Install

The skill is a directory (SKILL.md plus on-demand reference/ files), so install the whole folder. The easiest way is degit, which copies a GitHub subdirectory without the .git history:

npx degit agamm/claude-code-owasp/.claude/skills/owasp-security .claude/skills/owasp-security

Or install globally for all projects:

npx degit agamm/claude-code-owasp/.claude/skills/owasp-security ~/.claude/skills/owasp-security

What's Included

Claude Code Skill

Location: .claude/skills/owasp-security/

SKILL.md (the always-loaded core):

OWASP Top 10:2025 quick reference table
Security code review checklists for input handling, auth, access control, data protection, and error handling
Secure code patterns with unsafe/safe examples
OWASP Top 10 for LLM Applications (2025) - LLM01-LLM10 risks for chatbots, RAG, and tool-calling apps
OWASP Agentic AI Security (2026) - ASI01-ASI10 risks for AI agent systems
ASVS 5.0 key requirements by verification level
Deep security analysis mindset for any language

reference/ (loaded on demand, following Claude Code progressive-disclosure best practices):

languages.md - language-specific security quirks for 20+ languages with unsafe/safe examples
owasp-report.md - comprehensive deep-dive on every OWASP 2025-2026 standard

Usage

Once installed, Claude Code automatically activates this skill when you:

Review code for security vulnerabilities
Implement authentication or authorization
Handle user input or external data
Work with cryptography or password storage
Design API endpoints
Build AI agent systems

Example Prompts

"Review this code for security issues"
"Is this authentication implementation secure?"
"What are the security risks in this Python code?"
"Help me implement secure session management"
"Check this AI agent for OWASP agentic risks"

Covered Standards

Standard	Version	Focus
OWASP Top 10	2025	Web application vulnerabilities
OWASP ASVS	5.0.0	Security verification requirements
OWASP Top 10 for LLM Apps	2025	LLM/RAG/tool-calling app risks
OWASP Agentic	2026	AI agent security risks

Language Coverage

Security quirks for 20+ languages including:

Web	Systems	Mobile	Scripting
JavaScript/TypeScript	C/C++	Swift	Python
PHP	Rust	Kotlin	Ruby
Java	Go	Dart	Perl
C#			Shell

Each language section includes common vulnerabilities, unsafe/safe code patterns, and key functions to watch for.

Alternative Installation

Clone Full Repository

git clone https://github.com/agamm/claude-code-owasp.git
cp -r claude-code-owasp/.claude/skills/owasp-security YOUR_PROJECT/.claude/skills/

Contributing

Contributions welcome! Please:

Fork the repository
Create a feature branch
Submit a pull request

Sources

License

MIT License - See LICENSE file for details.

Keywords: OWASP, security, Claude Code, AI security, application security, ASVS, secure coding, vulnerability, injection, XSS, CSRF, authentication, authorization