list_catalogs

THE RISK

Low Risk

Why list_catalogs needs a policy

This tool performs a read-only query to enumerate service catalogs. It has no side effects, does not create, modify, delete, or execute operations. The blast radius of misuse is minimal — an agent could only discover what catalogs exist, which is informational only. Severity is low due to lack of destructive or operational impact.

From the tool's definition Tool name is 'list_catalogs' and description states it 'Lists the available service catalogs in the instance' — a pure retrieval operation with no modification or execution.

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

POLICY

How to control list_catalogs

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

policy.json

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

list_catalogs 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 Snow — 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

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All 88 Snow tools →

Read tools on other servers

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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_catalogs

What does the list_catalogs tool do? +

Lists the available service catalogs in the instance. It is categorised as a Read tool in the Snow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_catalogs? +

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

What risk level is list_catalogs? +

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

Can I rate-limit list_catalogs? +

Yes. Add a rate_limit block to the list_catalogs 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_catalogs completely? +

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

list_catalogs is provided by the Snow MCP server (shunyaai/snow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Snow tool call.

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

CHECK YOUR STACK →