domain_buy

THE RISK

Critical Risk

Why domain_buy needs a policy

Purchasing a domain is a financial transaction that creates a monetary obligation. This falls under the Financial category as it involves spending money. The severity is critical because an AI agent misusing this tool could make unauthorized purchases, and the action may be difficult or impossible to reverse once the domain is bought.

From the tool's definition Tool name 'domain_buy' and description 'Purchase a domain' indicate a financial transaction that commits monetary obligations.

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

POLICY

How to control domain_buy

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "domain_buy": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to domain_buy is blocked until a human approves it. The rest of the server keeps working.

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

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Free to start. No card required.

EXPLORE

Related tools and policies

More eToro MCP Server tools

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All 154 eToro MCP Server tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in eToro MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about domain_buy

What does the domain_buy tool do? +

Purchase a domain. It is categorised as a Financial tool in the eToro MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on domain_buy? +

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

What risk level is domain_buy? +

domain_buy is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit domain_buy? +

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

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

domain_buy is provided by the eToro MCP Server MCP server (shlomico-tr/etoroportfoliomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every eToro MCP Server tool call.

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

CHECK YOUR STACK →