request_key_portability

THE RISK

Medium Risk

Why request_key_portability needs a policy

This tool initiates a Pix key portability request, which creates/modifies a financial identity record (Pix key ownership) across Payment Service Providers. It is a Write operation (initiating a portability flow, not directly moving money), but carries high severity because misuse could hijack a user's Pix key routing, redirecting future payments to an attacker-controlled account.

From the tool's definition Request portability of a Pix key from another PSP into this PSP (DICT portability flow)

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

POLICY

How to control request_key_portability

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 request_key_portability:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "request_key_portability": {
      "limits": [
        {
          "counter": "request_key_portability_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

request_key_portability 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.

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.

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EXPLORE

Related tools and policies

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All 1300 Mcp Ap2 tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about request_key_portability

What does the request_key_portability tool do? +

Request portability of a Pix key from another PSP into this PSP (DICT portability flow). It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on request_key_portability? +

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

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

Can I rate-limit request_key_portability? +

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

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

request_key_portability 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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