savings_goal_create · Starling Bank MCP: Risk & Policy

WHAT IT DOES

What savings_goal_create does on Starling Bank

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

WHY IT NEEDS A POLICY

Why savings_goal_create needs a policy

This tool creates a new savings goal, which is a reversible write operation that modifies the user's account data structure. While it involves financial context (a savings goal is a financial construct), it does not directly move money, charge fees, or execute trades—it merely creates a goal record that can be modified or deleted later.

From the tool's definition Tool name 'savings_goal_create' and description 'Create a new savings goal' indicate creation of a new financial record that modifies account state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

savings_goal_create Rate-limited

savings_goal_create 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": {
    "savings_goal_create": {
      "limits": [
        {
          "counter": "savings_goal_create_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 Starling Bank, so you can run agents against it safely.

FAQ

Questions about savings_goal_create

What does the savings_goal_create tool do? +

Create a new savings goal. It is categorised as a Write tool in the Starling Bank MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on savings_goal_create? +

Register the Starling Bank MCP server in PolicyLayer and add a rule for savings_goal_create: 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 Starling Bank. Nothing to install.

What risk level is savings_goal_create? +

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

Can I rate-limit savings_goal_create? +

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

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

savings_goal_create is provided by the Starling Bank MCP server (starling-bank-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.