Create a promotion/discount in VTEX
AI agents use create_promotion to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.
This tool creates new promotional/discount records in VTEX, which is a reversible write operation. Promotions can typically be modified or deleted later. It does not execute arbitrary code, delete data irreversibly, or move money. The medium severity reflects that misuse could create unintended promotional offers affecting revenue, but the impact is modifiable and not permanent.
From the tool's definition Tool name 'create_promotion' and description 'Create a promotion/discount in VTEX' indicate data creation/modification. The tool creates a new promotion record in the VTEX commerce platform.
Documented attack patterns abuse exactly the kind of access create_promotion gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for create_promotion:
{
"version": "1",
"default": "deny",
"tools": {
"create_promotion": {
"limits": [
{
"counter": "create_promotion_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_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.
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Create a promotion/discount in VTEX. It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for create_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 Ap2. Nothing to install.
create_promotion is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_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.
Set action: deny in the PolicyLayer policy for create_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.
create_promotion is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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