upsert_merchant_product

Create or replace a product in a Merchant Center feed — this is how a merchant

SERVERHermoso SOURCEhttps://app.hermoso.ai/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/hermoso/upsert-merchant-product.md

WHAT IT DOES

What upsert_merchant_product does on Hermoso

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

RISK

Why upsert_merchant_product is rated Medium

An AI agent can call upsert_merchant_product faster than any human can review: one bad instruction and it creates or modifies resources in Hermoso by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upsert_merchant_product safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Hermoso, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upsert_merchant_product, this is the rule to start with:

upsert_merchant_product Rate-limited

upsert_merchant_product 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": {
    "upsert_merchant_product": {
      "limits": [
        {
          "counter": "upsert_merchant_product_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Hermoso, apply this rule, and every upsert_merchant_product call is checked against it from then on.

FAQ

Questions about upsert_merchant_product

What does the upsert_merchant_product tool do? +

Create or replace a product in a Merchant Center feed — this is how a merchant. It is categorised as a Write tool in the Hermoso MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upsert_merchant_product? +

Register the Hermoso MCP server in PolicyLayer and add a rule for upsert_merchant_product: 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 Hermoso. Nothing to install.

What risk level is upsert_merchant_product? +

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

Can I rate-limit upsert_merchant_product? +

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

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

upsert_merchant_product is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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