manage_blacklist · Fastly NGWAF MCP Server MCP

WHAT IT DOES

What manage_blacklist does on Fastly NGWAF MCP Server

AI agents use manage_blacklist 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_blacklist needs a policy

Managing an IP blacklist involves creating, updating, or removing entries from a blocklist—reversible write operations on firewall security configurations. While the exact operations aren't fully detailed, the capability to modify security policies carries high severity due to potential for inadvertent blocking of legitimate traffic or unblocking of malicious IPs.

From the tool's definition Tool name 'manage_blacklist' indicates modification of IP blocklist entries. Sibling tools include create_* and delete_* operations that suggest this tool performs reversible modifications to firewall rules/configurations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

manage_blacklist Rate-limited

manage_blacklist 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_blacklist": {
      "limits": [
        {
          "counter": "manage_blacklist_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_blacklist

What does the manage_blacklist tool do? +

Manage IP blacklist (blocklist). 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_blacklist? +

Register the Fastly NGWAF MCP Server MCP server in PolicyLayer and add a rule for manage_blacklist: 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_blacklist? +

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

Can I rate-limit manage_blacklist? +

Yes. Add a rate_limit block to the manage_blacklist 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_blacklist completely? +

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

manage_blacklist 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.