update_gateway · Rebillia MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_gateway does on Rebillia MCP Server

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

WHY IT NEEDS A POLICY

Why update_gateway needs a policy

This is a Write operation that modifies payment gateway configuration, which is reversible but sensitive. It affects how transactions are processed and credentials are stored. While it modifies configuration rather than moving money directly, unauthorized updates could redirect payments or compromise payment security.

From the tool's definition Tool performs PUT operation on gateway resource to update company gateway configuration, including optional credentials and settings. Description states 'Update a company gateway' with gateway ID parameter.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_gateway Rate-limited

update_gateway 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_gateway": {
      "limits": [
        {
          "counter": "update_gateway_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about update_gateway

What does the update_gateway tool do? +

Update a company gateway. PUT /gateways/{gatewayId}. Optional: displayName, setting (credentials key-value object). It is categorised as a Write tool in the Rebillia 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 update_gateway? +

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

What risk level is update_gateway? +

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

Can I rate-limit update_gateway? +

Yes. Add a rate_limit block to the update_gateway 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_gateway completely? +

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

update_gateway is provided by the Rebillia MCP Server MCP server (rhinosaas/rebillia-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.