get_variable_history

THE RISK

Low Risk

Why get_variable_history needs a policy

This tool retrieves historical monetary data (such as exchange rates, tax coefficients, or inflation indices maintained by AFIP) based on variable IDs and optional date ranges. It performs pure data retrieval with no side effects, no code execution, and no state changes. While the data may be sensitive in a financial context, the tool itself cannot modify records, execute operations, or create financial obligations.

From the tool's definition Tool name 'get_variable_history' and description 'Get the historical series for any monetary variable by id' indicate retrieval of historical data.

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

POLICY

How to control get_variable_history

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_variable_history:

policy.json

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

get_variable_history 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.

CAP THIS TOOL →

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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_variable_history

What does the get_variable_history tool do? +

Get the historical series for any monetary variable by id, with optional date range. Use list_variables to discover ids. 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_variable_history? +

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

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

Can I rate-limit get_variable_history? +

Yes. Add a rate_limit block to the get_variable_history 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_variable_history completely? +

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

get_variable_history 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 →