create_waf_rule_tool · MCP Cloudflare MCP: Risk & Policy

WHAT IT DOES

What create_waf_rule_tool does on MCP Cloudflare

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

WHY IT NEEDS A POLICY

Why create_waf_rule_tool needs a policy

Creating a WAF rule modifies security configuration but does not irreversibly delete data or move money. It is reversible (can be deleted via delete_waf_rule_tool), making it Write rather than Destructive. WAF rules affect traffic filtering and security posture, warranting high severity due to potential for misconfiguration causing service disruption or security weakening.

From the tool's definition Tool name 'create_waf_rule_tool' indicates creation of a WAF (Web Application Firewall) rule. The sibling tools include destructive operations (delete_dns_record_tool, delete_page_rule_tool, delete_waf_rule_tool) and other write operations…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_waf_rule_tool Rate-limited

create_waf_rule_tool 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": {
    "create_waf_rule_tool": {
      "limits": [
        {
          "counter": "create_waf_rule_tool_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 MCP Cloudflare, so you can run agents against it safely.

FAQ

Questions about create_waf_rule_tool

What does the create_waf_rule_tool tool do? +

create_waf_rule_tool. It is categorised as a Write tool in the MCP Cloudflare MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_waf_rule_tool? +

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

What risk level is create_waf_rule_tool? +

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

Can I rate-limit create_waf_rule_tool? +

Yes. Add a rate_limit block to the create_waf_rule_tool 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 create_waf_rule_tool completely? +

Set action: deny in the PolicyLayer policy for create_waf_rule_tool. 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 create_waf_rule_tool? +

create_waf_rule_tool is provided by the MCP Cloudflare MCP server (pypi:mcp-cloudflare-crunchtools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.