list_categories

ServerCoolPC MCP Server
CategoryRead

WHAT IT DOES

What list_categories does on CoolPC MCP Server

AI agents call list_categories to retrieve information from CoolPC MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_categories needs a policy

This tool retrieves catalog metadata (categories, counts, markers) for informational purposes. It has no side effects, does not execute code, modify data, or trigger external operations. It is a straightforward read operation aligned with browsing and understanding available product types.

From the tool's definition Tool description states it 'Get[s] a complete list' and 'Shows category names, product counts, and special markers'. These are query/retrieval operations with no modification or execution.

Documented attack patterns abuse exactly the kind of access list_categories gives an agent:

POLICY

How to control list_categories

PolicyLayer is an MCP gateway — it sits between your AI agents and CoolPC MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_categories:

policy.json

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

list_categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register CoolPC MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More CoolPC MCP Server tools

Read get_category_products Browse all products within a specific category. Useful for exploring all options in a prod Read get_product_by_model Get detailed specifications and pricing for a specific product by exact model number. Use Read search_cpu Specialized CPU/processor search tool. Find CPUs by socket compatibility, core count, and Read search_gpu Specialized graphics card (VGA) search tool. Find GPUs by chipset model, VRAM capacity, an Read search_motherboard Specialized motherboard (MB/mainboard) search tool. Find motherboards by CPU socket, chips Read search_products General search across all computer components. Use this for broad searches or when compone Read search_ram Specialized memory (RAM) search tool. Find desktop or laptop memory by DDR generation, tot Read search_ssd Specialized SSD/solid-state drive search tool. Find storage drives by interface type, capa

All 9 CoolPC MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_categories

What does the list_categories tool do? +

Get a complete list of all product categories with statistics. Shows category names, product counts, and special markers (hot items, discounts). Useful for browsing available product types or understanding the catalog structure. It is categorised as a Read tool in the CoolPC MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_categories? +

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

What risk level is list_categories? +

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

Can I rate-limit list_categories? +

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

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

list_categories is provided by the CoolPC MCP Server MCP server (shyuan/coolpc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CoolPC MCP Server tool call.

Start from CoolPC MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

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9 CoolPC MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.