Snyk alternative
A Snyk alternative for Claude skills and MCP servers
If you're trying to use Snyk to vet a community MCP server before claude plugin install, you'll get a green badge that means almost nothing. SkillAudit grades the tool-handler code itself — the surface MCP introduced and traditional SCA scanners weren't built for.
TL;DR
Snyk is excellent at flagging CVEs in your package.json and recognising OWASP patterns in conventional web app code. It does not, today, model the threat surface of an MCP server: untrusted-content prompt injection through tool responses, fetch(url) SSRF in dynamically-constructed tool handlers, credential echo from environment variables back through tool output, or per-repo grading that buyers can read at install time. We scanned 101 of the most-installed MCP servers and found 50% had SSRF and 38% had credential-handling findings. Snyk passed most of them clean. SkillAudit was built specifically for that gap.
Why teams look for a Snyk alternative when adopting MCP
Snyk's value proposition is "find known vulnerabilities in your application's open-source dependencies." Its core engines — Snyk Open Source (SCA), Snyk Code (SAST), Snyk Container, Snyk IaC — were built around the threat model of conventional web application development: a CVE is filed in a public database, a dependency tree includes the vulnerable version, you upgrade. That works because the vulnerable code is in someone else's package, the fix is published, and the scanner is essentially a fast lookup table over Software Bill of Materials.
An MCP server is a different shape of risk. The dangerous code is usually in the handler body of a tool the server registers — a function the LLM will be allowed to call with arguments derived from untrusted input. The vulnerabilities are mostly first-party: an SSRF written into server.tool('fetch_url', async ({url}) => await fetch(url)), a credential echoed back through tool output because the developer logged it for debugging, a prompt-injection payload smuggled inside a tool response that a downstream model will read as instructions. None of those leave a CVE; they're just code, written this week, by someone who hasn't shipped to a public marketplace before.
Three shifts that drive the search for a Snyk alternative for the MCP stack:
- The dangerous surface is in tool handlers, not in dependencies. A Snyk scan of an MCP repo will tell you the right things about
expressoraxiosversions and stay quiet about thefetch(template_url)in your tool code. The Heroku official MCP server has 10 template-stringfetchcall sites in its tool handlers — a textbook SSRF primitive — and reads as a clean "no high vulnerabilities" repo on a conventional SAST scan. - Buyers want a single buyer-readable grade. A team lead deciding whether to allow an indie skill into their agent fleet does not want to read a 60-finding Snyk report. They want "A" or "F" and a one-paragraph reason. SkillAudit's report cards are written for that decision.
- Prompt injection is a first-class threat for LLM tool use. Snyk doesn't model it. SkillAudit runs an LLM-assisted prompt-injection probe against extracted tool handlers as a separate axis.
How SkillAudit is different
SkillAudit is a six-axis static + LLM-assisted scanner built specifically for Claude skills and MCP servers. The six axes — security, permissions hygiene, credential exposure, maintenance, client compatibility, documentation — were chosen by reading the actual code of vendor-official MCP releases that shipped vulnerabilities, not by porting a generic SAST taxonomy. The output is a single A–F grade plus a public report card at a stable URL the author can embed as a badge on their README.
Where Snyk runs as part of your CI on your own code, SkillAudit runs against any public GitHub repo, npm package, or uploaded ZIP — including code you don't own and might be considering installing. That's the buyer-side use case Snyk doesn't try to serve.
Side by side
| Snyk | SkillAudit | |
|---|---|---|
| Threat model focus | Dependency CVEs, OWASP web patterns, container/IaC misconfig | MCP tool-handler SSRF, prompt injection, credential echo, permission scope |
| Scans your own code or third-party? | Primarily your own code in CI | Any public repo, npm, or ZIP — including code you're about to install |
| LLM-assisted prompt-injection probe | No | Yes — extracts tool handlers, red-teams them via Claude Haiku 4.5 |
SSRF detection in fetch(url) tool handlers | Generic SAST; misses dynamic URL construction patterns common in MCP | Pattern-based static check tuned to MCP idioms (template-string fetch, dynamic baseURL, etc.) |
| Credential-echo detection (env var → tool response) | Not a primary check | First-class axis; flags process.env.X in handler return paths |
| Single A–F buyer grade | Severity-bucketed finding list | One letter grade + per-axis pass/warn/fail |
| Public report card URL (buyer-readable) | No (private dashboard) | Yes (e.g. /audits/owner-repo/) |
| Public embed badge for authors | Snyk badge is dependency-vuln focused | Skill-grade badge written for marketplace listings |
| Free tier scope | 200 tests/month, limited repos | 3 audits/month on public repos, unlimited public reports |
| Starting paid price | $25/mo (Team), enterprise quote required for scale | $19/mo (Pro), $99/mo (Team, 10 seats) |
| CI integration | Mature: GitHub Actions, GitLab, Jenkins, Bitbucket, Azure | GitHub Action with min-grade gate (Pro) |
| Org-wide policy & reporting | Mature, large customer base | Team plan: SSO, policy export, min-grade CI gate, SBOM |
What the data says
We ran SkillAudit against 101 of the most-installed Claude skills and MCP servers — the full live board is public and growing. The corpus includes vendor-official releases (Stripe, PayPal, MongoDB, Redis, Cloudflare, AWS, Azure, GCP, Heroku, Elastic, Notion, Snowflake, Pinecone, Couchbase, and the nine official Anthropic MCP language SDKs), popular indie frameworks (FastMCP, mcp-use, mcp-agent), and community releases.
Results: 50% (50/101) shipped SSRF findings, 38% (38/101) had credential-handling findings, 10% (10/101) had command-exec findings, and only 19% (19/101) earned an A grade. The full grade distribution is 19 A · 30 C · 10 D · 42 F. The methodology and named per-repo grades are written up in our research post: The state of MCP server security, 2026.
The relevant point for the Snyk comparison: most of the F-grade vendor repos on that list pass conventional SCA + SAST cleanly. Their package.json trees are healthy. The findings are in tool-handler bodies, not in dependencies — which is exactly where the threat moved when MCP shipped.
When Snyk is still the right choice
Snyk is the right scanner for plenty of work — even for MCP authors. We have no incentive to be dishonest about that and you'd disbelieve us if we tried. Specifically:
- You need broad SAST + SCA + container + IaC coverage across a polyglot codebase. Snyk's coverage is wide and mature. SkillAudit is narrow on purpose: skill and MCP code only. Run both.
- You're an enterprise buyer with strict procurement, audit-log, and on-prem deployment requirements. Snyk has the SOC 2 / FedRAMP / on-prem story. SkillAudit Team plan covers SSO + policy export + audit log; we're not yet positioned as an enterprise replacement for Snyk's full suite.
- Your priority is dependency CVE remediation in long-running production services. That's Snyk's home turf. SkillAudit doesn't try to compete.
- Your code is conventional web/API code, not LLM tool handlers. A Rails app or a Node API server gets more value from Snyk than from SkillAudit; SkillAudit's checks are tuned to MCP-specific surface.
The most useful framing: Snyk is for the library and the framework; SkillAudit is for the tool surface MCP introduced. They sit alongside each other in CI, not in opposition.
Switching cost
SkillAudit isn't a replacement for Snyk — it's the second scanner you add when you ship MCP. Both can coexist in CI. A typical adoption path:
- Keep your existing Snyk integration unchanged for dependency CVEs and SAST.
- Add the SkillAudit GitHub Action with a minimum-grade gate (e.g. fail PR if grade falls below B).
- Drop the SkillAudit badge into your MCP server's README so reviewers and team buyers can read your grade at a glance before installing.
If you're an indie developer publishing a skill to a public marketplace, the calculation is even simpler: Snyk's free tier covers your dependency hygiene; SkillAudit's free tier covers your skill grade. Use both, free, until your audit volume exceeds three a month.
Try SkillAudit on your repo — free
Paste any GitHub URL on the home page, get a graded report card in 60 seconds. Your repo joins the public board only if you opt in; private repos audit through a single-repo OAuth scope, never org-wide.