AI agents invoke lynis_audit to trigger actions in SAST MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Lynis is a system hardening and security audit tool that actively probes system configuration, running processes, installed software, and security settings. In the context of this SAST server that runs security scanning tools remotely on dedicated VMs, lynis_audit would execute a system-level audit. This falls under Execute due to active system interrogation and potential side effects.
From the tool's definition Tool name 'lynis_audit' combined with server context of SAST/security scanning tools; Lynis is a well-known system security auditing tool that executes deep system scans
Documented attack patterns abuse exactly the kind of access lynis_audit gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SAST MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for lynis_audit:
{
"version": "1",
"default": "deny",
"tools": {
"lynis_audit": {
"limits": [
{
"counter": "lynis_audit_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}lynis_audit stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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lynis_audit. It is categorised as a Execute tool in the SAST MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the SAST MCP Server MCP server in PolicyLayer and add a rule for lynis_audit: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches SAST MCP Server. Nothing to install.
lynis_audit is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the lynis_audit rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for lynis_audit. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
lynis_audit is provided by the SAST MCP Server MCP server (sengtocxoen/sast-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SAST MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
39 SAST MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.