manage_users · Fastly NGWAF MCP Server MCP: Risk & Policy

WHAT IT DOES

What manage_users does on Fastly NGWAF MCP Server

AI agents use manage_users 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_users needs a policy

User management operations can create new user accounts, modify permissions, or change authentication credentials. While potentially reversible through account deletion or modification, the security impact is significant because unauthorized user management could grant attackers administrative access to Fastly WAF infrastructure.

From the tool's definition Tool name 'manage_users' with description 'Manage corporation users' indicates create/update/modify operations on user accounts. The 'manage' verb encompasses adding, modifying, or removing user access.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

manage_users Rate-limited

manage_users 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_users": {
      "limits": [
        {
          "counter": "manage_users_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_users

What does the manage_users tool do? +

Manage corporation users. 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_users? +

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

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

Can I rate-limit manage_users? +

Yes. Add a rate_limit block to the manage_users 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_users completely? +

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

manage_users 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.