update_bill_run · Rebillia MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_bill_run does on Rebillia MCP Server

AI agents use update_bill_run 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_bill_run needs a policy

This tool modifies billing records (bill run scheduling) in a reversible manner. It does not delete data (Destructive), execute arbitrary code (Execute), move money directly (Financial), though it operates within a financial billing context. The modification of bill run dates could affect when customers are charged, but the operation itself is a data update that can theoretically be changed again.

From the tool's definition The tool description states 'Update a bill run. PUT /bill-run/{billRunId}' and modifies the dateTime of a bill run. This is a modification operation (PUT request) that changes existing billing data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_bill_run Rate-limited

update_bill_run 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_bill_run": {
      "limits": [
        {
          "counter": "update_bill_run_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 Rebillia MCP Server, so you can run agents against it safely.

FAQ

Questions about update_bill_run

What does the update_bill_run tool do? +

Update a bill run. PUT /bill-run/{billRunId}. Required: billRunId, newDateTime. Use ISO 8601: YYYY-MM-DDTHH:MM:SS or with timezone (e.g. 2026-02-26T20:05:00Z). If no timezone, Z (UTC) is appended. Note: this tool only works on bill runs with status pending. Calls against completed or error runs will fail. 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_bill_run? +

Register the Rebillia MCP Server MCP server in PolicyLayer and add a rule for update_bill_run: 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_bill_run? +

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

Can I rate-limit update_bill_run? +

Yes. Add a rate_limit block to the update_bill_run 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_bill_run completely? +

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

update_bill_run 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.