AI agents call defense_effectiveness to retrieve information from Novyx without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool measures or queries the effectiveness of an existing defense—a read-only operation that retrieves information about defense performance. It has no side effects, does not modify data, does not execute external operations with variable consequences, and does not delete or move money.
From the tool's definition Tool name 'defense_effectiveness' and description 'Measure the effectiveness of a deployed defense' indicates data retrieval and measurement/analysis with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access defense_effectiveness gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Novyx, and nothing reaches the server without passing your rules. This is the rule we recommend for defense_effectiveness:
{
"version": "1",
"default": "deny",
"tools": {
"defense_effectiveness": {}
}
}defense_effectiveness is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Measure the effectiveness of a deployed defense. It is categorised as a Read tool in the Novyx MCP Server, which means it retrieves data without modifying state.
Register the Novyx MCP server in PolicyLayer and add a rule for defense_effectiveness: 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 Novyx. Nothing to install.
defense_effectiveness is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the defense_effectiveness 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 defense_effectiveness. 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.
defense_effectiveness is provided by the Novyx MCP server (novyxlabs/novyx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 120 Novyx tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
120 Novyx tools catalogued and risk-classified — across an index of 42,500+ MCP servers.