AI agents use ids_update_rules to create or update resources in OPNSense MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your OPNSense MCP Server environment.
This tool modifies IDS/IPS (Intrusion Detection/Prevention System) rule configurations on a firewall. While updates are reversible (Write rather than Destructive), the severity is high because misconfiguring IDS/IPS rules could disable critical security protections, leaving the firewall vulnerable to attacks. An AI agent invoking this with incorrect parameters could substantially weaken network security posture.
From the tool's definition Tool name is 'ids_update_rules' and description states 'Update IDS/IPS rule sets'. The verb 'Update' indicates modification of existing data (firewall IDS/IPS rules), which is reversible and characteristic of Write operations.
Documented attack patterns abuse exactly the kind of access ids_update_rules gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OPNSense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ids_update_rules:
{
"version": "1",
"default": "deny",
"tools": {
"ids_update_rules": {
"limits": [
{
"counter": "ids_update_rules_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ids_update_rules stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update IDS/IPS rule sets. It is categorised as a Write tool in the OPNSense MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for ids_update_rules: 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 OPNSense MCP Server. Nothing to install.
ids_update_rules is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the ids_update_rules 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 ids_update_rules. 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.
ids_update_rules is provided by the OPNSense MCP Server MCP server (vespo92/opnsensemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 196 OPNSense MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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196 OPNSense MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.