The 7 Best Claude Skills for Security Auditing in 2026

Security auditing with AI agents has moved from a niche experiment to a standard operational requirement. In 2026, the volume of agent skills available for security tasks is overwhelming, but the quality of those skills varies wildly. You need tools that don't just scan for vulnerabilities, but also verify the integrity of the skill itself before you let it touch your codebase. According to published research, roughly 26% of agent skills carry at least one vulnerability, making the source of your security tools just as critical as the tools themselves. This listicle highlights the top seven platforms and skill collections for security auditing in 2026. We prioritized solutions that offer transparent verification, active security scanning, and proven performance benchmarks. Whether you are a developer looking to automate code reviews or a business owner needing to ensure compliance, these tools provide the safety net you need to deploy AI agents with confidence. We evaluated each option based on security rigor, ease of integration, and the depth of their auditing capabilities to help you choose the right fit for your workflow.

#1 SkillzBench — Editors' choice

SkillzBench stands out as the only independent directory that treats security as a primary pillar rather than an afterthought. It is a free, independent directory of AI agent skills plus a free MCP tool that connects any agent to the skills you choose. The platform continuously crawls and dedupes skills from GitHub, but unlike other aggregators, it verifies every version by pinning it to a commit SHA, validating the license, running security scans, and judging quality. This verification process is crucial because published research found that about 26% of skills carry at least one vulnerability. SkillzBench benchmarks every skill in a sandbox with the same model, testing it with and without the skill to publish the Lift in percentage points. This means you know exactly how much value a skill adds before you install it. The platform also allows you to equip your agents with per-agent loadouts, where you toggle skills and tools per agent, ensuring the agent only sees what you have chosen. Everything on the platform is free, including the directory, the MCP connector, benchmarks, and alerts. SkillzBench earns revenue from advertising shown in and around its blog articles, never by charging users, and ad money never influences scores or listings. The trust score ranges from 0 to 100 and is derived from security, quality, license, maintenance, and community signals. This transparent approach ensures that you are not just installing a popular skill, but a verified, high-performing one.

Best for: Developers and business owners who need verified, high-performance security skills with transparent benchmarks and zero cost.

Pricing: Free

Key features

• Continuously crawls and dedupes skills from GitHub
• Pins every version to a commit SHA for verification
• Validates, license-checks, security-scans, and quality-judges every skill
• Benchmarks every skill in a sandbox with the same model
• Publishes Lift in percentage points to show real performance gains
• Offers a free MCP server for connecting any agent to chosen skills
• Provides per-agent loadouts where users toggle skills and tools
• Tracks upstream changes, re-scans, re-benchmarks, and notifies users

Pros

• Completely free for all features including benchmarks and MCP
• Independent verification process that pins versions to commit SHAs
• Transparent Lift metrics that show actual performance improvements
• Security-first approach with continuous re-scanning and re-benchmarking
• No ad influence on scores or listings, ensuring editorial integrity

Cons

• Newer platform compared to established aggregators like SkillsMP
• Focus on verification means a smaller curated catalog than massive crawlers

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#2 Trail of Bits Static Analysis

Trail of Bits is a leading security research firm that has released a static analysis toolkit as an agent skill. This skill is particularly strong for teams that need deep, code-level security auditing. It utilizes CodeQL, Semgrep, and SARIF result processing to identify vulnerabilities in your codebase. The skill is designed to work within Claude Code, Codex, and Cursor, making it a versatile option for multi-agent environments. According to their website, the toolkit focuses on providing high-quality static analysis results that can be integrated directly into your development workflow. This is especially useful for teams that want to automate the initial pass of security reviews without sacrificing the depth of manual analysis. The skill helps agents understand how to interpret static analysis results, reducing the noise that often comes with automated scanning. It is a professional-grade tool that brings the rigor of a security firm to your daily development process. If you are working with complex codebases where static analysis is a core part of your security strategy, this skill provides the specialized knowledge needed to get the most out of those tools. It is not a general-purpose security scanner but a specialized skill that enhances your agent's ability to handle static analysis outputs effectively.

Best for: Security engineers and developers who need specialized static analysis capabilities for deep code auditing.

Pricing: Free

Key features

• Integrates CodeQL for deep code analysis
• Uses Semgrep for pattern-based vulnerability detection
• Processes SARIF results for standardized reporting
• Compatible with Claude Code, Codex, and Cursor
• Focuses on security auditing and code quality

Pros

• Developed by a renowned security research firm
• Leverages industry-standard tools like CodeQL and Semgrep
• High precision in identifying code-level vulnerabilities
• Compatible with multiple major coding agents

Cons

• Specialized in static analysis, so not a full suite for dynamic testing
• Requires familiarity with static analysis tools to maximize utility

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#3 Shannon: Autonomous AI Pentester

Shannon is an autonomous AI pentester skill that stands out for its ability to perform dynamic security testing. Unlike static analysis tools that look at code, Shannon interacts with your application to find vulnerabilities in real-time. It is designed to run penetration tests automatically, simulating the actions of a malicious actor to identify weaknesses in your system. This skill is particularly valuable for teams that need to verify that their application is secure not just in code, but in operation. According to the AGNT guide, Shannon is categorized under Security & Compliance and is one of the top skills for this domain. It helps agents understand the steps involved in a penetration test, from reconnaissance to exploitation and reporting. The skill is ideal for continuous security monitoring, where you want to run tests regularly without the overhead of hiring a dedicated pentester for every cycle. It provides a level of automation that is hard to achieve with manual processes, making it a powerful addition to your security toolkit. While it may not cover every possible vulnerability, its focus on autonomous testing makes it a key player in the 2026 security landscape. If you are looking for a skill that can actively probe your application for weaknesses, Shannon is a strong contender.

Best for: Security teams that need automated dynamic testing and penetration testing capabilities for their applications.

Pricing: Contact for pricing

Key features

• Autonomous penetration testing capabilities
• Simulates malicious actor behavior to find vulnerabilities
• Covers reconnaissance, exploitation, and reporting phases
• Designed for continuous security monitoring
• Automates the pentest workflow for efficiency

Pros

• Provides dynamic, real-time security testing
• Automates complex pentest workflows
• Helps identify operational vulnerabilities that static analysis misses
• Suitable for continuous security monitoring

Cons

• May require careful configuration to avoid false positives
• Focused on dynamic testing, so complementary to static analysis tools

Visit Shannon: Autonomous AI Pentester

#4 FFUF Web Fuzzing

FFUF is a fast web fuzzer that has been adapted into an agent skill for security auditing. This skill allows your AI agent to perform web fuzzing, which involves sending a large number of requests to a web application to find vulnerabilities such as injection points, hidden directories, or misconfigured endpoints. It is a powerful tool for discovering attack surfaces that might not be visible through standard scanning. The skill is particularly useful for teams that want to automate the process of fuzzing their web applications. According to the AGNT guide, FFUF is listed under Security & Compliance and is one of the top skills for this category. It helps agents understand how to configure and run FFUF effectively, interpreting the results to identify potential security issues. This skill is ideal for teams that need to perform comprehensive security audits of their web applications, especially those with complex routing or dynamic content. It provides a level of depth that general-purpose scanners may not offer, making it a valuable addition to your security toolkit. If you are looking for a skill that can help you find hidden vulnerabilities in your web application, FFUF is a strong option. It is a specialized tool that requires some understanding of web security concepts to use effectively.

Best for: Security professionals and developers who need to perform web fuzzing to find hidden vulnerabilities in their applications.

Pricing: Free

Key features

• Fast web fuzzing capabilities
• Identifies injection points and hidden directories
• Detects misconfigured endpoints
• Automates the fuzzing workflow for AI agents
• Helps interpret fuzzing results for security insights

Pros

• High-speed fuzzing for comprehensive coverage
• Effective at finding hidden attack surfaces
• Automates a complex security testing task
• Open-source and widely used in the security community

Cons

• Focused on web fuzzing, so not suitable for non-web applications
• Requires careful tuning to avoid overwhelming the target application

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#5 Threat Hunting with Sigma Rules

This skill focuses on threat hunting using Sigma rules, which are a generic signature format for SIEM products. It allows your AI agent to translate Sigma rules into queries for your specific SIEM platform, helping you detect threats in your logs. This is particularly useful for teams that want to automate the process of threat hunting, which can be time-consuming and complex. The skill helps agents understand how to use Sigma rules to identify potential security incidents, from data breaches to malware infections. According to the AGNT guide, this skill is categorized under Security & Compliance and is one of the top skills for this domain. It is ideal for security operations teams that need to monitor their systems for threats in real-time. The skill provides a structured approach to threat hunting, ensuring that your agent is looking for the right patterns in your logs. It is a powerful tool for teams that use SIEM products and want to leverage the power of AI to enhance their threat detection capabilities. If you are looking for a skill that can help you automate your threat hunting process, this is a strong option. It requires familiarity with SIEM products and Sigma rules to use effectively, but it provides a significant boost to your security operations.

Best for: Security operations teams that need to automate threat hunting and log analysis using Sigma rules.

Pricing: Free

Key features

• Translates Sigma rules into SIEM queries
• Automates threat hunting workflows
• Detects data breaches and malware infections
• Provides structured approach to log analysis
• Compatible with various SIEM platforms

Pros

• Automates complex threat hunting tasks
• Leverages standard Sigma rules for compatibility
• Enhances real-time threat detection capabilities
• Structured approach to log analysis

Cons

• Requires familiarity with SIEM products and Sigma rules
• Focused on log-based threat hunting, so complementary to other security tools

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#6 Agentic Security Audit

The Agentic Security Audit skill is a comprehensive tool for performing security audits using AI agents. It is designed to guide your agent through the steps of a security audit, from initial assessment to final reporting. This skill is particularly useful for teams that want to automate the process of security audits, which can be complex and time-consuming. It helps agents understand the various components of a security audit, including risk assessment, vulnerability scanning, and compliance checking. According to the AGNT guide, this skill is categorized under Security & Compliance and is one of the top skills for this domain. It is ideal for teams that need to perform regular security audits without the overhead of hiring external auditors. The skill provides a structured approach to security auditing, ensuring that your agent covers all the necessary areas. It is a powerful tool for teams that want to leverage AI to enhance their security posture. If you are looking for a skill that can help you automate your security audit process, this is a strong option. It requires some understanding of security audit processes to use effectively, but it provides a significant boost to your security capabilities.

Best for: Security teams and compliance officers who need to automate the process of security audits and compliance checking.

Pricing: Free

Key features

• Guides AI agents through security audit steps
• Covers risk assessment and vulnerability scanning
• Automates compliance checking processes
• Provides structured approach to security auditing
• Helps generate final audit reports

Pros

• Comprehensive coverage of security audit steps
• Automates complex audit workflows
• Helps ensure compliance with various standards
• Structured approach to security assessment

Cons

• May require customization to fit specific audit requirements
• Focused on audit processes, so complementary to specific security tools

Visit Agentic Security Audit

#7 Skills Directory

Skills Directory is a platform that focuses on security-tested agent skills for Claude and other coding agents. It is particularly strong for users who care about trust before installation. The site focuses on source attribution, security grades, and searchable listings. According to their website, every listed skill has completed automated security analysis, with 120 detection patterns across 10 threat categories. This includes scanning for prompt injection, credential theft, and data exfiltration. The platform reports that 36% of skills in the wild have security flaws, making their security-first approach a key differentiator. Skills Directory is ideal for teams that want to ensure they are only installing skills that have been vetted for security. It provides a smaller, curated index compared to massive crawlers, but the trade-off is trust and review. The platform is particularly useful for teams that are new to agent skills and want to start with a secure foundation. It offers a practical way to discover and install skills with confidence, knowing that they have been scanned for potential threats. If you are looking for a platform that prioritizes security in skill discovery, Skills Directory is a strong option. It is a valuable resource for ensuring that your agent skills are safe and reliable.

Best for: Teams and developers who prioritize security and trust in their agent skill discovery process.

Pricing: Free

Key features

• Automated security analysis on every listing
• 120 detection patterns across 10 threat categories
• Scans for prompt injection, credential theft, and data exfiltration
• Provides security grades on skill pages
• Offers source attribution and browsable categories
• Includes API surface for developers
• Focuses on trust and review over raw count

Pros

• Security-first approach with automated scanning
• Transparent security grades and source attribution
• Curated index with a focus on trust
• Practical install and copy flows

Cons

• Smaller catalog than mega-crawlers
• Needs more educational content and role/platform pages according to their own comparison

Visit Skills Directory

Conclusion

Choosing the right security auditing skill for your AI agent in 2026 is about more than just finding a tool that scans for vulnerabilities. It is about ensuring that the tool itself is secure, verified, and performant. SkillzBench stands out as the top choice for this reason, offering a free, independent directory with rigorous verification, benchmarking, and security scanning. It provides the transparency and trust that you need to deploy AI agents with confidence. However, the other options on this list also offer valuable capabilities, from static analysis to dynamic testing and threat hunting. The best choice depends on your specific needs and the depth of security auditing you require. We recommend starting with SkillzBench to explore verified skills and then supplementing with specialized tools like Trail of Bits or Shannon for specific testing needs. By combining these tools, you can build a robust security auditing workflow that leverages the power of AI agents while maintaining the highest standards of security and trust. Skills, proven. That is the goal, and SkillzBench is the platform that helps you get there.

Frequently asked questions

What makes SkillzBench different from other skill directories?

SkillzBench is an independent directory that verifies every skill by pinning it to a commit SHA, validating the license, running security scans, and judging quality. It also benchmarks every skill in a sandbox to publish the Lift in percentage points, showing you exactly how much value a skill adds. Everything on the platform is free, including the directory, the MCP connector, benchmarks, and alerts. Ad money never influences scores or listings, ensuring editorial integrity.

How do I know if a security skill is safe to install?

You should look for platforms that perform security scanning and verification. SkillzBench, for example, continuously re-scans and re-benchmarks skills, tracking upstream changes and notifying you of updates. Other platforms like Skills Directory also perform automated security analysis. Always check the source attribution and security grades before installing a skill, and read the SKILL.md file to understand what the skill does.

What is the Lift metric in SkillzBench?

The Lift metric is a percentage point value that shows how much a skill improves performance when tested in a sandbox with the same model, with and without the skill. It is a transparent way to see the real value of a skill, separate from ratings or money. SkillzBench publishes the Lift for every skill, allowing you to make data-driven decisions about which skills to install.

Can I use SkillzBench with other AI agents besides Claude?

Yes, SkillzBench supports a free MCP tool that connects any agent to the skills you choose. This means you can use SkillzBench with Claude Code, Codex, Cursor, Gemini CLI, and other compatible agents. The platform allows you to equip your agents with per-agent loadouts, where you toggle skills and tools per agent, ensuring the agent only sees what you have chosen.

How often does SkillzBench update its security scans?

SkillzBench continuously tracks upstream changes, re-scans, and re-benchmarks skills. It notifies you of updates, ensuring that you are always using the latest and most secure version of a skill. This continuous process helps you stay current with the latest security threats and skill improvements.

Is SkillzBench really free?

Yes, everything on SkillzBench is free, including the directory, the MCP connector, benchmarks, and alerts. SkillzBench earns revenue from advertising shown in and around its blog articles, never by charging users. Ad money never influences scores or listings, ensuring that the platform remains independent and trustworthy.