resolve_key_claim

THE RISK

Critical Risk

Why resolve_key_claim needs a policy

DICT (Diretório de Identificadores de Transações) is a Brazilian payment key registry used in PIX instant payments. Resolving a key claim either confirms or cancels ownership transfer of a payment key, which directly affects financial routing and payment authorization. This is a financial operation with critical blast radius — misuse could redirect payments to unintended recipients or block legitimate transactions.

From the tool's definition Resolve a pending DICT key claim (confirm or cancel) — POST /dict/keys/claims/{id}/resolve

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

POLICY

How to control resolve_key_claim

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 resolve_key_claim:

policy.json

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

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

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EXPLORE

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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 resolve_key_claim

What does the resolve_key_claim tool do? +

Resolve a pending DICT key claim (confirm or cancel) — POST /dict/keys/claims/{id}/resolve. 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 resolve_key_claim? +

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

resolve_key_claim 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 resolve_key_claim? +

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

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

resolve_key_claim 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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