preview_list

THE RISK

Low Risk

Why preview_list needs a policy

This tool retrieves a limited preview of data (up to 1000 records) from a list for inspection purposes. It performs no write, delete, or execution operations—it only reads and displays data. The 'preview' functionality is explicitly non-destructive and side-effect-free, making it a straightforward Read operation with low severity.

From the tool's definition Tool name 'preview_list' and description 'Preview up to 1000 records from a large list (CSV) before initiating a full large read request' indicate querying/retrieving data with no modifications.

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

POLICY

How to control preview_list

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

policy.json

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

preview_list 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 Anaplan MCP — 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 →

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EXPLORE

Related tools and policies

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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 preview_list

What does the preview_list tool do? +

Preview up to 1000 records from a large list (CSV) before initiating a full large read request. It is categorised as a Read tool in the Anaplan MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on preview_list? +

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

What risk level is preview_list? +

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

Can I rate-limit preview_list? +

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

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

preview_list is provided by the Anaplan MCP server (larasrinath/anaplan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Anaplan MCP tool call.

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

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