upc_lookup

Look up a product by UPC/EAN barcode number.

SERVERUnClick SOURCE@unclick/mcp-server

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/upc-lookup.md

WHAT IT DOES

What upc_lookup does on UnClick

AI agents call upc_lookup to retrieve information from UnClick without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`upc`	string	Yes	UPC or EAN barcode number.

Parameters from the server's own tool schema.

RISK

Why upc_lookup is rated Low

This tool retrieves product information based on a barcode identifier. It performs a query operation that returns data without creating, modifying, deleting, or executing any external operations. The lookup is informational only, making it a Read category tool with low severity.

From the tool's definition Tool is named 'upc_lookup' and described as 'Look up a product by UPC/EAN barcode number.' The verb 'look up' and the read-only nature of querying a barcode database indicate data retrieval with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upc_lookup safely

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

upc_lookup Allowed

upc_lookup is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "upc_lookup": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about upc_lookup

What does the upc_lookup tool do? +

Look up a product by UPC/EAN barcode number. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.

What parameters does upc_lookup accept? +

upc_lookup accepts 1 parameter: upc. Required: upc. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on upc_lookup? +

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

What risk level is upc_lookup? +

upc_lookup is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit upc_lookup? +

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

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

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

KEEP EXPLORING

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