set_tier · Run402 MCP: Risk & Policy

WHAT IT DOES

What set_tier does on Run402

AI agents use set_tier to commit financial operations through Run402 — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why set_tier needs a policy

This tool directly commits financial obligations by subscribing, renewing, or upgrading a tier. It triggers payment flows via x402, making it a Financial category tool. Misuse could result in unauthorized charges or subscription commitments, hence critical severity.

From the tool's definition Subscribe, renew, or upgrade tier... Returns success or payment details if x402 payment is needed.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_tier Approval-gated

Any call to set_tier is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_tier": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Run402, so you can run agents against it safely.

FAQ

Questions about set_tier

What does the set_tier tool do? +

Subscribe, renew, or upgrade tier. Auto-detects action based on allowance state. Returns success or payment details if x402 payment is needed. It is categorised as a Financial tool in the Run402 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on set_tier? +

Register the Run402 MCP server in PolicyLayer and add a rule for set_tier: 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 Run402. Nothing to install.

What risk level is set_tier? +

set_tier is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit set_tier? +

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

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

set_tier is provided by the Run402 MCP server (kychee-com/run402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.