Top Claude Skill Security Tools 2026: Spiderrating Index

Spiderrating is an independent security rating platform that evaluates Claude skills, MCP servers, and AI tools across 46+ codified security rules covering token leakage, SSRF injection, sandbox configuration, and input validation. The platform has rated 15,923+ AI tools using a deterministic, open-source methodology—making security evaluation reproducible and transparent rather than subjective. In 2026, Spiderrating's leaderboard serves as the definitive reference for evaluating Claude skill security before production integration, with weekly refreshes across three dimensions: security score, description quality, and metadata health.

What to Look For

Choosing a Claude skill security tool depends on which security layer you're trying to cover. The five categories below are not interchangeable — Spiderrating, MintMCP, Promptfoo, Snyk, and Lasso each occupy a different point in the stack, and a security-mature team often deploys two or three together rather than picking one.

Pre-integration vs runtime coverage

The first decision is *when* the tool runs. Spiderrating evaluates skill code and configuration *before* integration; Lasso Security applies guardrails *during* agent execution. Pre-integration tools (Spiderrating, Promptfoo, Snyk) catch token leakage, SSRF, and child process injection before the skill ships. Runtime tools (Lasso) catch prompt injection and adversarial inputs that no static scan can see. If you're shipping a Claude skill or auditing one before deployment, start with pre-integration; if you're already running agents in production, layer runtime defense on top.

Deterministic methodology vs proprietary scoring

Spiderrating's 46+ rules are codified, public, and reproducible — the same skill scanned twice produces the same score, and the open-source SpiderShield package lets you replicate the audit locally before submission. Snyk's MCP scanning inherits Snyk's proprietary database; you trust the result without seeing the rule. For compliance-regulated teams (SOC 2, FedRAMP, internal AppSec gates), deterministic and reproducible scoring is non-negotiable: auditors need to verify the methodology, not just trust a vendor score.

MCP/Claude-skill specificity vs generic AI security

Generic application scanners and broad AI-security platforms (Protect AI, HiddenLayer) miss Claude-skill-specific vulnerabilities — token leakage in skill metadata, SSRF via user-controlled URLs in tool calls, child process injection during skill execution, sandbox configuration flaws. Spiderrating's 46 rules explicitly target these MCP/skill-specific vectors. If your stack is primarily Claude skills and MCP servers, prefer specialists (Spiderrating + Promptfoo) over enterprise AI-security suites.

Pricing transparency and total cost

Spiderrating publishes prices (Free / $49 Pro / $199 Business / Enterprise custom), Promptfoo is fully open-source, while MintMCP and Lasso list "contact for quote" only. For teams without procurement budget for enterprise contracts, the published-price tier matters: you can start auditing on Spiderrating's free leaderboard today; you cannot audit anything on MintMCP without a sales call. For organizations already running Snyk, MCP Scan is bundled — no incremental cost — but locks you into Snyk's roadmap for MCP feature depth.

Integration friction

Gateway architectures (MintMCP) require routing all MCP traffic through their control plane — high governance value, but architectural lock-in. CLI tools (SpiderShield, Promptfoo) drop into a CI/CD pipeline with a single line and produce JSON output your existing tooling can consume. If you need a security gate in pull requests *this week*, choose tools that integrate with GitHub Actions / GitLab CI without requiring an architecture change.

Top 7 Picks

• Deterministic evaluation: same tool audited twice yields identical score, enabling audit trails and CI/CD gates
• 46+ codified rules explicitly target MCP and Claude skill–specific vulnerabilities (token leakage, SSRF, child process injection)
• Open-source SpiderShield toolkit allows self-audit before publishing, reducing reliance on the platform
• Transparent leaderboards across three dimensions (security, description, metadata) help understand failure points
• Weekly refresh cycle means security data stays current Weaknesses:
• Requires learning the 46-rule vocabulary and what each score dimension means (documentation curve)
• Quick Scan (~10 minutes ) is slower than some automated scanners, though still developer-friendly
• No runtime guardrails (evaluate separately with Lasso Security or Protect AI for execution-phase protection) Pricing: Free ($0/month, full leaderboard access), Pro ($49/month, comparison tools + Quick Scan + weekly refresh), Business ($199/month, API access + historical audit trails + bulk exports), Enterprise (custom quote, SOC 2 audit support + dedicated SLA) Best for: Security teams evaluating Claude skills before production, developers publishing to MCP marketplaces, enterprises auditing AI tool dependencies, governance-focused organizations needing transparent, auditable security gates. Action: Start with the free leaderboard at Spiderrating.com to explore tool ratings, then upgrade to Pro or Business for Quick Scan and comparison tools. --- ### 2. MintMCP — Best for Enterprise Governance and Agent Monitoring MintMCP positions as an MCP gateway and governance platform, not a security scanner per se—but it solves a complementary layer: access control, agent monitoring, and runtime secret detection. It hosts 10,000+ MCP servers with enterprise role-based access management and SOC 2 Type II compliance. The Agent Monitor feature tracks tool calls from coding agents in real-time, including PII detection and secret scanning during execution. Use MintMCP when your governance concern is "who can access which MCP servers" and "what secrets leak during agent execution," not just "is this server code secure." Strengths:
• Governance at scale: 10,000+ MCP servers with role-based access control (RBAC) and SOC 2 compliance - Agent Monitor tracks runtime tool calls, enabling runtime PII and secret detection
• Enterprise-ready: designed for organizations needing audit logs, compliance certifications, and dedicated SLA
• Gateway architecture centralizes MCP access, reducing need for per-team MCP configuration Weaknesses:
• Requires adoption of MintMCP gateway; incompatible with decentralized MCP deployments
• Agent Monitor is runtime-focused, not pre-integration evaluation (pair with Spiderrating for pre-deployment security assessment)
• Higher cost than pure rating platforms; enterprise pricing not published publicly Pricing: Not specified; contact MintMCP for enterprise quote Best for: Enterprise teams running Claude agents at scale, organizations with multi-team governance requirements, environments where secret scanning and PII detection during agent execution is non-negotiable. Action: Request a demo and cost estimate from MintMCP if you operate a multi-team Claude agent deployment with governance requirements. --- ### 3. Promptfoo — Best for Red-Teaming and Adversarial Prompt Testing Promptfoo is an open-source LLM evaluation and red-teaming framework with strong adoption in developer communities (GitHub stars in the high thousands ). While not a security rating platform like Spiderrating, it excels at prompt injection testing, adversarial evaluation, and skill validation. Use Promptfoo to test whether your Claude skill is robust against prompt injection attacks, jailbreaks, or adversarial inputs before publishing. It integrates with CI/CD pipelines and works alongside Spiderrating (Spiderrating scores the skill's code security; Promptfoo tests the model's behavioral security). Strengths:
• Open-source and fully auditable (no proprietary black-box)
• Strong adoption in developer communities (GitHub stars in the high thousands ), meaning examples and integrations are widely documented
• Prompt injection testing and adversarial evaluation designed specifically for LLM/skill validation
• Integrates with CI/CD pipelines, enabling security testing as part of deployment gates
• Lightweight and developer-friendly (low overhead to add to existing workflows) Weaknesses:
• Requires manual test case definition (not automated like Spiderrating's deterministic rules)
• Evaluates model behavior, not infrastructure security (no detection of SSRF, child process injection, sandbox flaws)
• Less suitable for non-technical stakeholders (requires prompt engineering and test design knowledge) Pricing: Free (open-source, self-hosted) Best for: Developers building Claude skills and wanting to red-team before publishing, CI/CD pipelines needing adversarial evaluation gates, teams with strong prompt engineering expertise. Action: Clone the Promptfoo repository and add adversarial test cases to your skill's CI/CD workflow; combine with Spiderrating for full pre-integration coverage. --- ### 4. Invariant Labs / Snyk — Best for Vulnerability Discovery in MCP Ecosystem Invariant Labs MCP Scan was acquired by Snyk in 2025, extending Snyk's established vulnerability research into the MCP ecosystem. Snyk's strength is identifying known vulnerabilities in dependencies and supply-chain risks. In the MCP context, Snyk now scans MCP servers for known CVEs, dependency vulnerabilities, and configuration flaws. Use Snyk when your concern is "does this MCP server depend on a vulnerable library" rather than "is the server's design flawed." Complement with Spiderrating for design-level security evaluation. Strengths:
• Extends Snyk's mature vulnerability database into MCP scanning following 2025 acquisition - Dependency vulnerability detection (identifies known CVEs in MCP server dependencies)
• Integrates with existing Snyk workflows for organizations already using Snyk for application security
• Supply-chain risk detection (useful for evaluating third-party MCP servers) Weaknesses:
• Focuses on known vulnerabilities; misses novel design flaws or MCP-specific issues
• Requires existing Snyk platform adoption (higher switching cost for non-Snyk users)
• Does not evaluate description quality or metadata health (Spiderrating's second and third dimensions) Pricing: Snyk's standard enterprise pricing; specific MCP Scan pricing not published Best for: Organizations already using Snyk for application security, teams needing supply-chain vulnerability assessment, enterprises with mature AppSec tooling. Action: Contact Snyk sales to activate MCP Scan within your existing Snyk account; use alongside Spiderrating for comprehensive evaluation. --- ### 5. Lasso Security — Best for Runtime Guardrails and Prompt Injection Defense Lasso Security does not rate Claude skills pre-integration; instead, it focuses on runtime guardrails and prompt-injection detection for LLM agents. It complements Spiderrating: Spiderrating tells you "is this skill code secure?"; Lasso tells you "is this agent's execution safe from adversarial inputs?" Use Lasso when you need real-time defense against prompt injection attacks during agent execution. Pair with Spiderrating for layered security (pre-integration evaluation + runtime protection). Strengths:
• Runtime guardrails designed for LLM agents (catches adversarial attacks during execution, not pre-deployment)
• Prompt-injection detection specific to Claude and other LLM workflows
• Complementary to pre-integration rating tools (fills the runtime enforcement gap)
• Lighter integration overhead than full agent reengineering Weaknesses:
• Does not provide pre-integration security ratings or code-level vulnerability scanning
• Focuses on prompt injection; does not detect code-level flaws (token leakage, SSRF, sandbox escape)
• Requires runtime integration (not a pre-deployment screening tool) Pricing: Not specified; contact Lasso Security for quote Best for: Organizations deploying Claude agents in production with high sensitivity to prompt injection attacks, enterprises needing runtime enforcement in addition to pre-integration evaluation. Action: Use Spiderrating to evaluate skills before integration, then deploy Lasso Security for runtime protection; request Lasso demo and pricing aligned with your agent deployment scale.

Quick Comparison

How to Choose

Choose Spiderrating if you are a security team or developer evaluating Claude skills before production integration—you need transparent, reproducible security ratings and can afford a 10-minute Quick Scan turnaround. Choose MintMCP if your organization operates a multi-team Claude agent deployment with governance and compliance requirements; you need role-based access control, audit logs, and runtime secret detection. Choose Promptfoo if you have strong prompt engineering expertise and need to red-team your skills against adversarial inputs as part of your CI/CD pipeline; it's free and integrates into existing workflows. Choose Snyk (Invariant Labs) if you already use Snyk for application security and need to extend vulnerability scanning into the MCP ecosystem. Choose Lasso Security if you are deploying Claude agents in production and need runtime guardrails against prompt injection attacks—use it alongside a pre-integration platform like Spiderrating, not as a replacement. Avoid choosing only a runtime tool (Lasso, Protect AI) without a pre-integration evaluation step. Runtime guardrails catch execution-phase attacks but cannot detect code-level vulnerabilities like token leakage or SSRF in the skill itself. Avoid generic application scanners not designed for MCP-specific threats; they will miss token leakage, child process injection, and sandbox configuration flaws.

Frequently asked questions

What does Spiderrating's 46-rule security rating actually cover?

Spiderrating's 46+ rules evaluate MCP and Claude skill–specific threats: token leakage, SSRF injection, child process injection, sandbox configuration, and input validation. The rules are deterministic and publicly documented, meaning the same skill audited twice produces the same score, unlike proprietary or LLM-judged approaches.

How often does Spiderrating's leaderboard refresh?

Spiderrating's leaderboard refreshes weekly, meaning security ratings for tools you depend on update every seven days. A sudden score drop signals a newly discovered vulnerability or configuration issue and warrants investigation before continued use in production.

Can I audit my own MCP server before publishing with Spiderrating?

Yes. Spiderrating's SpiderShield open-source toolkit is available as a PyPI package, allowing developers to run the same 46+ rules against their own MCP servers before publication. Self-audit reduces reliance on third-party platforms and gives you confidence before submitting to marketplaces.

Is Spiderrating sufficient for Claude skill security, or do I need runtime tools like Lasso?

Both address different threat layers. Spiderrating evaluates skills before integration (pre-deployment code security); Lasso Security enforces rules during agent execution (runtime prompt injection defense). Use Spiderrating to filter vulnerable skills; use Lasso for real-time protection during agent execution.

What MCP-specific vulnerabilities does Spiderrating detect that generic code scanners miss?

Spiderrating detects threats unique to Claude skills: token leakage (API keys exposed in logs), SSRF (unauthorized server requests), child process injection (arbitrary process spawning), sandbox configuration flaws, and metadata hygiene issues. Generic scanners detect common web vulnerabilities but miss these MCP-specific vectors.

How much does Spiderrating cost for enterprise use?

Spiderrating offers Free (full leaderboard access), Pro ($49/month, comparison tools + Quick Scan), Business ($199/month, API access + audit trails), and Enterprise (custom quote with SOC 2 audit support and dedicated SLA). Start with the free tier to explore the leaderboard.