// MCP TOOL REFERENCE

pay_tribute

Pay a federal tribute (DARF, GPS, GRU) or other guia de arrecadação via Caixa. Input is the full 44/47-digit barcode or linha digitável plus debit account. Requires arrecadação contract.

ServerMcp Ap2
CategoryFinancial

How to control pay_tribute ↓

WHAT IT DOES

What pay_tribute does on Mcp Ap2

AI agents use pay_tribute to commit financial operations through Mcp Ap2 — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why pay_tribute needs a policy

This tool directly moves money from a debit account to government or institutional accounts in payment of federal obligations. It commits financial transactions with real monetary consequences and cannot be easily reversed.

From the tool's definition Tool name 'pay_tribute' combined with description 'Pay a federal tribute (DARF, GPS, GRU) or other guia de arrecadação via Caixa' explicitly processes financial payments.

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

POLICY

How to control pay_tribute

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 pay_tribute:

policy.json

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

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

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

More Mcp Ap2 tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial block_card Block a card temporarily (reversible). Use for lost-card or fraud-suspected flows. Card st Financial cancel_bill Cancel a pending bill Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_debit Cancel a debit-card payment by Getnet payment_id. Financial cancel_invoice Cancel/void an authorized invoice (FECancel — limited to certain types/conditions) Financial cancel_order Cancel an order, optionally restocking and refunding

All 1300 Mcp Ap2 tools →

Financial tools on other servers

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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 pay_tribute

What does the pay_tribute tool do? +

Pay a federal tribute (DARF, GPS, GRU) or other guia de arrecadação via Caixa. Input is the full 44/47-digit barcode or linha digitável plus debit account. Requires arrecadação contract. 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 pay_tribute? +

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

pay_tribute 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 pay_tribute? +

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

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

pay_tribute 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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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.