tiendanube_update_metafield · Tienda Nube MCP Server MCP

WHAT IT DOES

What tiendanube_update_metafield does on Tienda Nube MCP Server

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

WHY IT NEEDS A POLICY

Why tiendanube_update_metafield needs a policy

This tool modifies metadata associated with resources in Tienda Nube/Nuvemshop but does not create financial transactions, execute arbitrary operations, or permanently delete data. The impact is reversible (metafields can be updated again), making it a Write operation.

From the tool's definition Tool name contains 'update' and description states 'Update a metafield value by ID', indicating modification of existing data without deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tiendanube_update_metafield Rate-limited

tiendanube_update_metafield 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": {
    "tiendanube_update_metafield": {
      "limits": [
        {
          "counter": "tiendanube_update_metafield_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tienda Nube MCP Server, so you can run agents against it safely.

FAQ

Questions about tiendanube_update_metafield

What does the tiendanube_update_metafield tool do? +

UPDATE METAFIELD - Update a metafield value by ID. It is categorised as a Write tool in the Tienda Nube MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tiendanube_update_metafield? +

Register the Tienda Nube MCP Server MCP server in PolicyLayer and add a rule for tiendanube_update_metafield: 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 Tienda Nube MCP Server. Nothing to install.

What risk level is tiendanube_update_metafield? +

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

Can I rate-limit tiendanube_update_metafield? +

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

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

tiendanube_update_metafield is provided by the Tienda Nube MCP Server MCP server (pedrohsguimaraes/nuvem-shop-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.