// MCP TOOL REFERENCE

create_conversion

Execute an FX conversion between wallet currencies (e.g. swap USD received into BRL before settling locally). Pass quote_id for a locked quoted rate, or omit for a market rate.

ServerMcp Afip
CategoryFinancial

How to control create_conversion ↓

WHAT IT DOES

What create_conversion does on Mcp Afip

AI agents use create_conversion 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 create_conversion needs a policy

This tool performs a foreign exchange (FX) currency conversion between wallet balances, which constitutes a financial transaction involving the movement and conversion of funds. Misuse could result in unintended currency conversions at unfavorable rates or significant financial loss, warranting critical severity.

From the tool's definition Execute an FX conversion between wallet currencies... swap USD received into BRL before settling locally... locked quoted rate... market rate

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

POLICY

How to control create_conversion

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 create_conversion:

policy.json

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

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

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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 create_conversion

What does the create_conversion tool do? +

Execute an FX conversion between wallet currencies (e.g. swap USD received into BRL before settling locally). Pass quote_id for a locked quoted rate, or omit for a market rate. 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 create_conversion? +

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

create_conversion 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 create_conversion? +

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

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

create_conversion 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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