vtex_update_promotion · MCP VTEX Server MCP: Risk & Policy

WHAT IT DOES

What vtex_update_promotion does on MCP VTEX Server

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

WHY IT NEEDS A POLICY

Why vtex_update_promotion needs a policy

This tool modifies existing promotion records (discounts, rules, conditions) which are business-critical data affecting pricing and revenue. While reversible (can be updated again), unauthorized changes to promotions could cause significant financial impact through unintended discounts or pricing errors.

From the tool's definition Tool name is 'vtex_update_promotion' with description 'Update an existing promotion'. The verb 'update' indicates modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vtex_update_promotion Rate-limited

vtex_update_promotion 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP VTEX Server, so you can run agents against it safely.

FAQ

Questions about vtex_update_promotion

What does the vtex_update_promotion tool do? +

Update an existing promotion. It is categorised as a Write tool in the MCP VTEX Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vtex_update_promotion? +

Register the MCP VTEX Server MCP server in PolicyLayer and add a rule for vtex_update_promotion: 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 VTEX Server. Nothing to install.

What risk level is vtex_update_promotion? +

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

Can I rate-limit vtex_update_promotion? +

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

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

vtex_update_promotion is provided by the MCP VTEX Server MCP server (leosepulveda/mcp-vtex). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.