grant_items_to_users · Playfab MCP: Risk & Policy

WHAT IT DOES

What grant_items_to_users does on Playfab

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

WHY IT NEEDS A POLICY

Why grant_items_to_users needs a policy

This tool writes new item grants to player inventories. It is reversible in principle (items can be removed), so it falls under Write rather than Destructive. However, the blast radius is high because a misuse could grant valuable in-game items (potentially with real-money value) to arbitrary players at scale, affecting game economy and fairness.

From the tool's definition 'Grants items to one or more players' - creates/adds inventory items for players

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

grant_items_to_users Rate-limited

grant_items_to_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": {
    "grant_items_to_users": {
      "limits": [
        {
          "counter": "grant_items_to_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 Playfab, so you can run agents against it safely.

FAQ

Questions about grant_items_to_users

What does the grant_items_to_users tool do? +

Grants items to one or more players. Works for both single and bulk operations. It is categorised as a Write tool in the Playfab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on grant_items_to_users? +

Register the Playfab MCP server in PolicyLayer and add a rule for grant_items_to_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 Playfab. Nothing to install.

What risk level is grant_items_to_users? +

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

Can I rate-limit grant_items_to_users? +

Yes. Add a rate_limit block to the grant_items_to_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 grant_items_to_users completely? +

Set action: deny in the PolicyLayer policy for grant_items_to_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 grant_items_to_users? +

grant_items_to_users is provided by the Playfab MCP server (@akiojin/playfab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.