manage_lists · Fastly NGWAF MCP Server MCP: Risk & Policy

WHAT IT DOES

What manage_lists does on Fastly NGWAF MCP Server

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

WHY IT NEEDS A POLICY

Why manage_lists needs a policy

This is a Write operation because it modifies firewall configuration data (custom lists). It's not Destructive because list management typically allows updates/versioning rather than permanent deletion. Severity is high because misconfigured WAF lists can block legitimate traffic (denial of service to customers) or allow malicious traffic through.

From the tool's definition Tool name 'manage_lists' combined with description 'Manage custom lists' indicates ability to create, modify, or update custom lists (IP, country, string, etc.) in a WAF system. The verb 'manage' encompasses write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

manage_lists Rate-limited

manage_lists 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": {
    "manage_lists": {
      "limits": [
        {
          "counter": "manage_lists_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 Fastly NGWAF MCP Server, so you can run agents against it safely.

FAQ

Questions about manage_lists

What does the manage_lists tool do? +

Manage custom lists (IP, country, string, etc.). It is categorised as a Write tool in the Fastly NGWAF 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 manage_lists? +

Register the Fastly NGWAF MCP Server MCP server in PolicyLayer and add a rule for manage_lists: 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 Fastly NGWAF MCP Server. Nothing to install.

What risk level is manage_lists? +

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

Can I rate-limit manage_lists? +

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

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

manage_lists is provided by the Fastly NGWAF MCP Server MCP server (purpleax/fastlymcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.