create_shipment · UPS MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_shipment does on UPS MCP Server

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

WHY IT NEEDS A POLICY

Why create_shipment needs a policy

This tool creates shipment records and generates shipping labels, which are reversible actions (shipments can be voided via the sibling void_shipment tool). It commits financial obligations by generating charges, but does not directly transfer funds—that typically happens at payment reconciliation.

From the tool's definition Tool description states it will "Create a UPS shipment and generate a shipping label" and "Returns tracking number, charges, and label image". The verb "create" combined with generation of tracking numbers and billing charges indicates data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_shipment Rate-limited

create_shipment 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": {
    "create_shipment": {
      "limits": [
        {
          "counter": "create_shipment_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 UPS MCP Server, so you can run agents against it safely.

FAQ

Questions about create_shipment

What does the create_shipment tool do? +

Create a UPS shipment and generate a shipping label. Supports all UPS domestic and international services. Returns tracking number, charges, and label image (base64-encoded GIF by default). Common service codes: 03=Ground, 02=2nd Day Air, 01=Next Day Air, 13=Next Day Air Saver, 12=3 Day Select, 07=Express (intl), 11=Standard (intl). It is categorised as a Write tool in the UPS 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 create_shipment? +

Register the UPS MCP Server MCP server in PolicyLayer and add a rule for create_shipment: 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 UPS MCP Server. Nothing to install.

What risk level is create_shipment? +

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

Can I rate-limit create_shipment? +

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

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

create_shipment is provided by the UPS MCP Server MCP server (roscoej/ups-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.