Create or fully replace a listing item for the seller by SKU. Body must be a Listings Items submission (productType + attributes).
AI agents use put_listings_item 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 or updates listing items (product information) in what appears to be an e-commerce system. While this is a write operation (not destructive, since listings can be updated/replaced again), the severity is elevated to 'high' because unauthorized or incorrect listing modifications could impact seller inventory visibility, customer purchases, pricing, and business operations.
From the tool's definition Tool description states "Create or fully replace a listing item" which explicitly indicates creating or modifying data. The phrase "fully replace" indicates write operations on seller inventory/product listings.
Documented attack patterns abuse exactly the kind of access put_listings_item 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 put_listings_item:
{
"version": "1",
"default": "deny",
"tools": {
"put_listings_item": {
"limits": [
{
"counter": "put_listings_item_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}put_listings_item 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 or fully replace a listing item for the seller by SKU. Body must be a Listings Items submission (productType + attributes). 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 put_listings_item: 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.
put_listings_item 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 put_listings_item 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 put_listings_item. 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.
put_listings_item 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.
Free to start. No card required.
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