update_inventory_variant · Huly MCP: Risk & Policy

WHAT IT DOES

What update_inventory_variant does on Huly

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

WHY IT NEEDS A POLICY

Why update_inventory_variant needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_inventory_variant Rate-limited

update_inventory_variant 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": {
    "update_inventory_variant": {
      "limits": [
        {
          "counter": "update_inventory_variant_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 Huly, so you can run agents against it safely.

FAQ

Questions about update_inventory_variant

What does the update_inventory_variant tool do? +

Rename and/or change the SKU of an inventory variant. variant accepts ID, exact name, or exact SKU; pass product when needed. Rejects duplicate names or SKUs in the same product. It is categorised as a Write tool in the Huly MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_inventory_variant? +

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

What risk level is update_inventory_variant? +

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

Can I rate-limit update_inventory_variant? +

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

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

update_inventory_variant is provided by the Huly MCP server (@firfi/huly-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.