AI agents use withdraw to commit financial operations through Mcp Afip — usually the final step of a payment, billing, or trading workflow. A call moves real money.
The 'withdraw' action in a tax authority system commits financial obligations or movements of money. Even though the exact mechanism isn't fully detailed, withdrawal requests in financial systems are inherently Financial category tools. Given AFIP's role as a tax authority handling electronic invoicing and financial transactions, a withdrawal action represents a commitment to move funds.
From the tool's definition Tool named 'withdraw' on AFIP (Argentine tax authority) server with description 'Create a withdrawal request'. In financial/taxation context, withdrawal requests typically involve moving funds out of accounts or tax authority systems.
Documented attack patterns abuse exactly the kind of access withdraw gives an agent:
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 withdraw:
{
"version": "1",
"default": "deny",
"tools": {
"withdraw": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
} Any call to withdraw is blocked until a human approves it. The rest of the server keeps working.
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Create a withdrawal request. 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.
Register the Mcp Afip MCP server in PolicyLayer and add a rule for withdraw: 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.
withdraw is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the withdraw 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.
Set action: deny in the PolicyLayer policy for withdraw. 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.
withdraw 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.
Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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