// MCP TOOL REFERENCE

pay_tax_darf

ServerMcp Ap2
CategoryFinancial

WHAT IT DOES

What pay_tax_darf does on Mcp Ap2

AI agents use pay_tax_darf 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_tax_darf needs a policy

This tool commits financial obligations by processing actual tax and fee payments. The capability to initiate payments to tax authorities without reversible recovery makes this a Financial category tool at critical severity. A misused or compromised instance could result in unauthorized tax payments, financial losses, and legal complications.

From the tool's definition Tool description explicitly states 'Pay a federal tax (DARF) or union fee (GRU)' — this moves money out on behalf of the user to government tax authorities via Bradesco Arrecadação, a Brazilian payment processor.

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

POLICY

How to control pay_tax_darf

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_tax_darf:

policy.json

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

Any call to pay_tax_darf 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

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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 pay_tax_darf

What does the pay_tax_darf tool do? +

Pay a federal tax (DARF) or union fee (GRU) via Bradesco Arrecadação. Distinct product surface from utility arrecadação because DARF/GRU require tax-code fields (código de receita, período apuração, referência). 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_tax_darf? +

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

pay_tax_darf 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_tax_darf? +

Yes. Add a rate_limit block to the pay_tax_darf 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_tax_darf completely? +

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

pay_tax_darf 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.

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