list_custom_collections

THE RISK

Low Risk

Why list_custom_collections needs a policy

This tool retrieves and displays existing collection data without creating, modifying, deleting, or executing any changes. It is purely informational, with no side effects or destructive potential. The low blast radius reflects that listing collections cannot harm the system or data.

From the tool's definition Tool name 'list_custom_collections' and description 'List custom (manual) collections' indicate a retrieval operation with no modification capability. Intended use is to 'browse collections', a read-only action.

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

POLICY

How to control list_custom_collections

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

policy.json

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

list_custom_collections 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 Sapo — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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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_custom_collections

What does the list_custom_collections tool do? +

List custom (manual) collections. For SEO/content team: use to browse collections. It is categorised as a Read tool in the Sapo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_custom_collections? +

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

What risk level is list_custom_collections? +

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

Can I rate-limit list_custom_collections? +

Yes. Add a rate_limit block to the list_custom_collections 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_custom_collections completely? +

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

list_custom_collections is provided by the Sapo MCP server (nguyennguyenit/sapo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sapo tool call.

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

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