// MCP TOOL REFERENCE

pay_tax_darf

ServerMcp Afip
CategoryFinancial

WHAT IT DOES

What pay_tax_darf does on Mcp Afip

AI agents use pay_tax_darf to commit financial operations through Mcp Afip — 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 directly moves money by processing tax payments through a financial institution (Bradesco Arrecadação). Financial transactions represent the highest severity category. The specific mention of 'Pay' combined with 'federal tax' and 'union fee' with reference to a Brazilian payment processor confirms this is a financial operation that commits monetary obligations.

From the tool's definition Pay a federal tax (DARF) or union fee (GRU) via Bradesco Arrecadação. Tool explicitly performs payment transactions for tax obligations.

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 Afip, 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 Afip — 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 Afip tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

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Go deeper

Critical-risk tools in Mcp Afip → 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 Afip 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 Afip 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 Afip. 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 Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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