get_uva_value

THE RISK

Low Risk

Why get_uva_value needs a policy

This tool retrieves a read-only economic data point (UVA inflation index) with no side effects, data modification, code execution, or financial transactions. It is a simple data lookup similar to fetching a currency exchange rate or inflation figure. The severity is low because misuse would only allow an agent to read this public information, which carries minimal risk.

From the tool's definition Tool name 'get_uva_value' and description 'Get UVA...used for inflation-adjusted mortgage calculations' indicate a retrieval operation that queries a publicly available economic index value.

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

POLICY

How to control get_uva_value

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 get_uva_value:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_uva_value": {}
  }
}

get_uva_value is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_uva_value

What does the get_uva_value tool do? +

Get UVA (Unidad de Valor Adquisitivo) — used for inflation-adjusted mortgage calculations. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_uva_value? +

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

get_uva_value is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_uva_value? +

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

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

get_uva_value 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.

CHECK YOUR STACK →