subscribe_to_fund

THE RISK

Critical Risk

Why subscribe_to_fund needs a policy

This tool subscribes to a financial fund on BTG (a major investment bank), which constitutes committing financial obligations by investing/allocating money into a fund. This is a Financial category action with critical severity since misuse could result in unauthorized fund subscriptions and significant monetary loss.

From the tool's definition Subscribe (aplicar) to a fund on BTG

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

POLICY

How to control subscribe_to_fund

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 subscribe_to_fund:

policy.json

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

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

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Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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All 1300 Mcp Ap2 tools →

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Go deeper

Critical-risk tools in Mcp Ap2 → 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 subscribe_to_fund

What does the subscribe_to_fund tool do? +

Subscribe (aplicar) to a fund on BTG. It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on subscribe_to_fund? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for subscribe_to_fund: 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 subscribe_to_fund? +

subscribe_to_fund 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 subscribe_to_fund? +

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

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

subscribe_to_fund 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.

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