list_parent_segments

THE RISK

Low Risk

Why list_parent_segments needs a policy

This tool queries and returns a list of parent segments/audiences from the CDP without modifying, deleting, or executing any operations. It is a pure data retrieval function with minimal blast radius if misused—worst case being information disclosure of audience names.

From the tool's definition Tool name 'list_parent_segments' with description 'List all parent segments' indicates a retrieval operation. The phrase 'No parameters required' and the context of listing existing data confirm read-only behavior with no side effects.

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

POLICY

How to control list_parent_segments

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

policy.json

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

list_parent_segments 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 Treasure Data 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.

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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 →
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FAQ

Questions about list_parent_segments

What does the list_parent_segments tool do? +

[EXPERIMENTAL] List all parent segments (audiences) in Customer Data Platform. No parameters required. It is categorised as a Read tool in the Treasure Data MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_parent_segments? +

Register the Treasure Data MCP Server MCP server in PolicyLayer and add a rule for list_parent_segments: 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 Treasure Data MCP Server. Nothing to install.

What risk level is list_parent_segments? +

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

Can I rate-limit list_parent_segments? +

Yes. Add a rate_limit block to the list_parent_segments 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_parent_segments completely? +

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

list_parent_segments is provided by the Treasure Data MCP Server MCP server (treasure-data/td-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 Treasure Data MCP Server tool call.

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

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