update_fee · Smokeball MCP: Risk & Policy

WHAT IT DOES

What update_fee does on Smokeball

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

WHY IT NEEDS A POLICY

Why update_fee needs a policy

The tool updates an existing fee entry in the billing system. This is a write operation (modification of existing data) rather than destructive (no deletion) or financial (no money movement, just record modification). Misuse could alter billing records incorrectly, hence medium severity.

From the tool's definition 'Update a fee entry' - modifies an existing billing/fee record reversibly

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_fee Rate-limited

update_fee 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": {
    "update_fee": {
      "limits": [
        {
          "counter": "update_fee_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 Smokeball, so you can run agents against it safely.

FAQ

Questions about update_fee

What does the update_fee tool do? +

Update a fee entry. billable: 'true' or 'false' to set; leave empty to skip. It is categorised as a Write tool in the Smokeball MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_fee? +

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

What risk level is update_fee? +

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

Can I rate-limit update_fee? +

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

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

update_fee is provided by the Smokeball MCP server (rosenadvertising/smokeball-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.