COMPARISON
How Sigil compares
Sigil focuses on AI agent supply chain threats — the attack surface that traditional security tools were not designed for.
What makes Sigil different
AI-first
Built for MCP servers, Claude skills, and AI agent packages — attack surfaces traditional tools were never designed to analyse.
Quarantine model
Code is unpacked into an isolated quarantine directory and analysed before anything can execute. Nothing runs until you approve it.
Eight-phase analysis
Behavioural static detection across install hooks, code patterns, network calls, credentials, obfuscation, provenance, prompt injection, and skill security.
MCP server
Runs as an MCP server with 6 tools. AI agents can scan packages, repos, and MCP servers autonomously without leaving the agent loop.
Open source
Full CLI is free forever under Apache 2.0. All eight scan phases available locally with no account required.
Feature comparison
Sigil vs. npm audit, Snyk, and Socket
| Feature | Sigil | npm audit | Snyk | Socket |
|---|---|---|---|---|
| AI agent package scanning | Yes | No | No | Partial |
| MCP server security (Phase 8) | Yes | No | No | No |
| Prompt injection detection (Phase 7) | Yes | No | No | No |
| Install hook detection | Yes | No | Partial | Yes |
| Obfuscation detection | Yes | No | No | Yes |
| Quarantine before execute | Yes | No | No | No |
| MCP server integration (6 tools) | Yes | No | No | No |
| Free & open source CLI | Yes | Yes (limited) | Freemium | Freemium |
| CI/CD integration | Yes (Team) | Yes | Yes | Yes |
| Known CVE database | No | Yes | Yes | Yes |
Sigil focuses on behavioural static analysis, not CVE lookups. For CVE coverage, pair Sigil with npm audit or Snyk.
When to use Sigil
- You're building AI agents that install packages autonomously
- You want to scan MCP servers before connecting them
- You need to scan ClawHub skills, PyPI AI packages, or npm AI tools
- You want quarantine-first security — nothing runs until approved
When to use something else
- You need CVE/vulnerability database lookups — use Snyk or npm audit
- You're scanning non-AI packages with no supply chain risk — use npm audit
- You need license compliance scanning — use FOSSA or Snyk
Use Sigil alongside other tools
Sigil + npm audit catches both behavioural threats and known CVEs. Sigil + Snyk gives you supply chain analysis plus vulnerability coverage.
These tools complement each other — use them together.
Ready to scan your first package?
Free CLI. All eight scan phases. No account required.
