waf_enable_rule · WAF MCP Server MCP: Risk & Policy

WHAT IT DOES

What waf_enable_rule does on WAF MCP Server

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

WHY IT NEEDS A POLICY

Why waf_enable_rule needs a policy

This tool modifies ModSecurity rule configuration by re-enabling rules. It is reversible (rules can be disabled again), so it is Write rather than Destructive. The severity is medium because misconfiguring WAF rules can degrade security posture and potentially allow malicious traffic through, but the impact is limited to WAF configuration and reversible.

From the tool's definition waf_enable_rule 'Re-enable a previously disabled ModSecurity rule by ID' is a modification action that changes the operational state of a WAF rule.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

waf_enable_rule Rate-limited

waf_enable_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": {
    "waf_enable_rule": {
      "limits": [
        {
          "counter": "waf_enable_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 WAF MCP Server, so you can run agents against it safely.

FAQ

Questions about waf_enable_rule

What does the waf_enable_rule tool do? +

Re-enable a previously disabled ModSecurity rule by ID. It is categorised as a Write tool in the WAF MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on waf_enable_rule? +

Register the WAF MCP Server MCP server in PolicyLayer and add a rule for waf_enable_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 WAF MCP Server. Nothing to install.

What risk level is waf_enable_rule? +

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

Can I rate-limit waf_enable_rule? +

Yes. Add a rate_limit block to the waf_enable_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 waf_enable_rule completely? +

Set action: deny in the PolicyLayer policy for waf_enable_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 waf_enable_rule? +

waf_enable_rule is provided by the WAF MCP Server MCP server (kratosuae/waf_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.