Honest comparison

Guardrails block. Snare catches what gets through.

Prevention tools block known-bad behavior before it executes. Snare detects the moment a credential gets used after something slips through: novel attacks, zero-days, sophisticated prompt injections. You want both layers.

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Prevention reduces attack surface. Detection catches the rest.
AI Agent security stack live
Guardrail blocks known-bad prompt or tool request
Novel attack bypasses prevention logic
Snare catches attempted credential use after bypass
Defense in depth Prevention plus detection
Guardrails

What guardrail tools do well.

Tools like LlamaFirewall, Lakera, Prompt Security, and Rampart exist for good reason. They block known-bad prompts, reduce prompt injection risk, enforce output and tool policies, and make security and compliance teams much more comfortable with agent deployment.

Known-bad behavior blocking.

They are good at catching patterns you already understand: prompt injection indicators, unsafe tool use, policy violations, and sensitive output paths.

Control and policy.

They let teams express what is allowed, what is denied, and what should be reviewed. That is operationally valuable even before you talk about attack prevention.

Compliance-friendly posture.

Prevention tooling creates an explicit control plane around agents, which helps with internal reviews and external trust.

The gap

The gap.

Prevention tools work on known threat patterns and policy definitions. Novel attacks, zero-days in agent behavior, and sophisticated prompt injections can bypass guardrails. Detection catches what prevention misses.

01 / known patterns

Guardrails stop a lot of real attacks.

That matters. The point is not that they fail, but that they cannot perfectly model every future attack or every weird agent edge case.

02 / bypass

Novel behavior still happens.

Attackers iterate. Agent frameworks change. The thing that gets through is often the one you did not already encode into a rule or model.

03 / detect

Snare trips on credential use.

If the compromised workflow reaches for the bait and tries to authenticate, Snare gives you the signal even though prevention already failed upstream.

Rampart + Snare

Rampart plus Snare.

Rampart at rampart.sh is the prevention companion to Snare. Rampart blocks. Snare catches what gets through.

Rampart Stops dangerous agent behavior.

Policy enforcement for commands, exfiltration, persistence, and tool execution.

Snare Confirms attempted credential exploitation.

Tripwires the moment the bait is actually used, with context around the event.

Principle

The security principle.

Defense in depth is boring because it works. Prevention reduces attack surface. Detection catches the attacks that still land. AI agents are too messy to bet everything on one layer.

quickstart
$ curl -fsSL https://snare.sh/install | sh [ok] installed snare $ snare arm --webhook https://hooks.slack.com/services/... [ok] planted 3 precision canaries (awsproc, ssh, k8s)