mikrotik_create_filter_rule · MikroTik MCP: Risk & Policy

WHAT IT DOES

What mikrotik_create_filter_rule does on MikroTik MCP

AI agents use mikrotik_create_filter_rule to create or update resources in MikroTik MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MikroTik MCP environment.

WHY IT NEEDS A POLICY

Why mikrotik_create_filter_rule needs a policy

This tool creates a new firewall filter rule, which is a write operation (reversible — rules can be deleted). However, misconfiguration of firewall rules can block legitimate traffic, cause network outages, or open security vulnerabilities, making the blast radius high if misused by an AI agent.

From the tool's definition Creates a firewall filter rule on MikroTik device

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mikrotik_create_filter_rule Rate-limited

mikrotik_create_filter_rule 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mikrotik_create_filter_rule": {
      "limits": [
        {
          "counter": "mikrotik_create_filter_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MikroTik MCP, so you can run agents against it safely.

FAQ

Questions about mikrotik_create_filter_rule

What does the mikrotik_create_filter_rule tool do? +

Creates a firewall filter rule on MikroTik device. It is categorised as a Write tool in the MikroTik MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mikrotik_create_filter_rule? +

Register the MikroTik MCP server in PolicyLayer and add a rule for mikrotik_create_filter_rule: 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 MikroTik MCP. Nothing to install.

What risk level is mikrotik_create_filter_rule? +

mikrotik_create_filter_rule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mikrotik_create_filter_rule? +

Yes. Add a rate_limit block to the mikrotik_create_filter_rule 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.

How do I block mikrotik_create_filter_rule completely? +

Set action: deny in the PolicyLayer policy for mikrotik_create_filter_rule. 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.

What MCP server provides mikrotik_create_filter_rule? +

mikrotik_create_filter_rule is provided by the MikroTik MCP server (tarcisiodier/mcp-mikrotik). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.