get_users

THE RISK

Low Risk

Why get_users needs a policy

This tool retrieves user metadata (online status and roles) from the FoundryVTT server. It performs no side effects, creates no data, executes no commands, modifies nothing, and involves no financial transactions. The blast radius is minimal—knowing who is online and what roles users have does not enable an AI agent to cause harm through misuse of this tool alone.

From the tool's definition Tool name 'get_users' and description 'Get the list of users with their online status and roles' indicate a read-only query operation that retrieves user information without modifying any data.

Documented attack patterns abuse exactly the kind of access get_users gives an agent:

POLICY

How to control get_users

PolicyLayer is an MCP gateway — it sits between your AI agents and FoundryVTT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_users:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_users": {}
  }
}

get_users is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register FoundryVTT MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 25 FoundryVTT MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_users

What does the get_users tool do? +

Get the list of users with their online status and roles. It is categorised as a Read tool in the FoundryVTT MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_users? +

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

What risk level is get_users? +

get_users is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_users? +

Yes. Add a rate_limit block to the get_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 get_users completely? +

Set action: deny in the PolicyLayer policy for get_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 get_users? +

get_users is provided by the FoundryVTT MCP Server MCP server (laurigates/foundryvtt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every FoundryVTT MCP Server tool call.

Start from FoundryVTT MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →