create_price_rule

Create a price rule (the policy that governs discounts — percentage/fixed amount, prerequisites, entitlements, usage caps). Pair with create_discount_code to mint a usable code.

ServerMcp Afip
CategoryWrite

How to control create_price_rule ↓

WHAT IT DOES

What create_price_rule does on Mcp Afip

AI agents use create_price_rule to create or update resources in Mcp Afip — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Afip environment.

THE RISK

Medium Risk

Why create_price_rule needs a policy

This tool creates new pricing rules and discount policies, which is a reversible data modification (Write category). Severity is medium because misconfiguration or malicious use could affect pricing logic and revenue, but it does not directly execute transactions, delete data irreversibly, or move money.

From the tool's definition Tool description states 'Create a price rule' and mentions creating policies for discounts, percentages, amounts, and usage caps. This is clearly a creation operation that modifies data (adding new pricing rules to the system).

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

POLICY

How to control create_price_rule

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_price_rule:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_price_rule": {
      "limits": [
        {
          "counter": "create_price_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

create_price_rule stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create_price_rule

What does the create_price_rule tool do? +

Create a price rule (the policy that governs discounts — percentage/fixed amount, prerequisites, entitlements, usage caps). Pair with create_discount_code to mint a usable code. It is categorised as a Write tool in the Mcp Afip MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_price_rule? +

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

create_price_rule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_price_rule? +

Yes. Add a rate_limit block to the create_price_rule 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_price_rule completely? +

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

create_price_rule 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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