Partially update a listing item for the seller by SKU using a JSON Patch list of operations. Use this to change specific attributes without replacing the full listing.
AI agents use patch_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 modifies data reversibly by applying JSON Patch operations to update listing attributes. It falls under Write rather than Destructive (not irreversible deletion) or Execute (not arbitrary code execution). Severity is high because modifying seller listings can have significant business impact (pricing, availability, product information), and misuse could affect customer visibility and sales.
From the tool's definition Tool description states 'Partially update a listing item' and 'change specific attributes' without replacement. The 'patch' operation is a reversible modification (PATCH HTTP method semantics), not a deletion. Context is e-commerce/seller product listings.
Documented attack patterns abuse exactly the kind of access patch_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 patch_listings_item:
{
"version": "1",
"default": "deny",
"tools": {
"patch_listings_item": {
"limits": [
{
"counter": "patch_listings_item_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}patch_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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Partially update a listing item for the seller by SKU using a JSON Patch list of operations. Use this to change specific attributes without replacing the full listing. 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 patch_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.
patch_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 patch_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 patch_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.
patch_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.
1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.