swap_user_referral_code · Fuul MCP Server MCP: Risk & Policy

WHAT IT DOES

What swap_user_referral_code does on Fuul MCP Server

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

WHY IT NEEDS A POLICY

Why swap_user_referral_code needs a policy

The name 'swap_user_referral_code' suggests modifying or replacing a user's referral code, which is a write operation that could affect affiliate tracking and payouts. Given the server manages affiliate programs and payouts, changing a referral code could have significant downstream financial implications (e.g., mis-attributing commissions). However, since the description is empty, confidence is lowered.

From the tool's definition Tool name: swap_user_referral_code; description is empty

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

swap_user_referral_code Rate-limited

swap_user_referral_code 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": {
    "swap_user_referral_code": {
      "limits": [
        {
          "counter": "swap_user_referral_code_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Fuul MCP Server, so you can run agents against it safely.

FAQ

Questions about swap_user_referral_code

What does the swap_user_referral_code tool do? +

swap_user_referral_code. It is categorised as a Write tool in the Fuul 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 swap_user_referral_code? +

Register the Fuul MCP Server MCP server in PolicyLayer and add a rule for swap_user_referral_code: 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 Fuul MCP Server. Nothing to install.

What risk level is swap_user_referral_code? +

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

Can I rate-limit swap_user_referral_code? +

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

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

swap_user_referral_code is provided by the Fuul MCP Server MCP server (kuyen-labs/mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.