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Caterpillar is a free agentic ai security tool by Alice. Onyx Platform is a commercial agentic ai security tool by Onyx Security. Compare features, ratings, integrations, and community reviews side by side to find the best agentic ai security fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
Startup and SMB security teams adopting Claude Skills or similar AI agents need Caterpillar because it's the only free CLI scanner that catches permission escalation and credential theft in agent code before installation. It installs via curl with zero API key friction and covers both the ID.RA risk assessment and PR.PS platform hardening that NIST CSF 2.0 demands. Skip this if your organization needs post-deployment agent monitoring or runtime behavior analysis; Caterpillar stops threats at the gate, not in production.
Mid-market and enterprise security teams deploying AI agents across multiple LLMs need Onyx Platform because it's the only control plane that catches shadow AI deployments and unapproved model usage before they become compliance violations. The natural language policy engine and real-time prompt injection blocking cover both governance (GV.PO) and continuous monitoring (DE.CM) without requiring security teams to become prompt engineers. Skip this if your organization runs fewer than three LLM integrations or if you need post-incident forensics more than active agent behavior enforcement; the session replay is solid but the tool's real strength is prevention during runtime, not reconstruction after the fact.
CLI scanner that detects security threats in AI agent skills before installation.
AI control plane for enterprise AI agent security, governance, and observability.
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Common questions about comparing Caterpillar vs Onyx Platform for your agentic ai security needs.
Caterpillar: CLI scanner that detects security threats in AI agent skills before installation. built by Alice. headquartered in United States. Core capabilities include Scan AI skill files and directories for security threats, Detect dangerous or excessive permission requests, Identify data exfiltration behaviors in skills..
Onyx Platform: AI control plane for enterprise AI agent security, governance, and observability. built by Onyx Security. headquartered in United States. Core capabilities include Real-time AI agent activity monitoring across LLMs and frameworks, Session replay and audit trail for compliance and forensics, Shadow AI and unapproved model deployment detection..
Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.
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