webpay_increase_amount

THE RISK

Critical Risk

Why webpay_increase_amount needs a policy

This tool finalizes a payment capture on a Webpay Plus transaction, which constitutes a financial commitment — it moves money from the cardholder to the merchant. Misuse could result in unauthorized or incorrect charges, making it critical severity under the Financial category.

From the tool's definition Capture a previously authorized Webpay Plus transaction (partial-capture / deferred-capture flow)

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

POLICY

How to control webpay_increase_amount

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 webpay_increase_amount:

policy.json

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

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

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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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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 webpay_increase_amount

What does the webpay_increase_amount tool do? +

Capture a previously authorized Webpay Plus transaction (partial-capture / deferred-capture flow). 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 webpay_increase_amount? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for webpay_increase_amount: 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 webpay_increase_amount? +

webpay_increase_amount 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 webpay_increase_amount? +

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

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

webpay_increase_amount 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.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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