get_bank_accounts

THE RISK

Low Risk

Why get_bank_accounts needs a policy

This tool queries and retrieves existing bank account information from the Omie ERP system. While the data retrieved (bank account details) is sensitive in a payment protocol context, the operation itself is non-destructive and read-only. The severity is low because listing accounts does not modify state, execute commands, or move money.

From the tool's definition Tool name is 'get_bank_accounts' and description states 'List registered bank accounts in Omie ERP' — the verb 'list' indicates a read-only retrieval operation with no data modification.

Documented attack patterns abuse exactly the kind of access get_bank_accounts gives an agent:

POLICY

How to control get_bank_accounts

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for get_bank_accounts:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_bank_accounts": {}
  }
}

get_bank_accounts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Ap2 — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_bank_accounts

What does the get_bank_accounts tool do? +

List registered bank accounts in Omie ERP. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_bank_accounts? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_bank_accounts: 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 Mcp Ap2. Nothing to install.

What risk level is get_bank_accounts? +

get_bank_accounts is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_bank_accounts? +

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

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

get_bank_accounts is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →