crow_actual_transactions

THE RISK

Low Risk

Why crow_actual_transactions needs a policy

The tool lists/reads financial transaction data (amounts, expenses, income) but does not move money or modify records. However, it exposes sensitive financial information, warranting medium severity. The description clearly states it is a listing operation with optional filters.

From the tool's definition "List transactions with optional filters" — retrieves transaction data with no stated side effects

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

POLICY

How to control crow_actual_transactions

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

policy.json

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

crow_actual_transactions 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 Crow — 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

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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 crow_actual_transactions

What does the crow_actual_transactions tool do? +

List transactions with optional filters. Amounts in cents (negative = expense, positive = income). It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on crow_actual_transactions? +

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

What risk level is crow_actual_transactions? +

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

Can I rate-limit crow_actual_transactions? +

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

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

crow_actual_transactions is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

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

CHECK YOUR STACK →