cloud_list_activities

THE RISK

Low Risk

Why cloud_list_activities needs a policy

This tool retrieves historical activity and audit log data. It has no side effects, does not execute code, does not modify or delete data, and does not involve financial transactions. Listing audit logs is a read-only operation with minimal blast radius even if called unnecessarily by an agent.

From the tool's definition Tool name includes 'list' and description states 'List organization activities (audit log)' — retrieval of audit/activity records with no modification or deletion.

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

POLICY

How to control cloud_list_activities

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

policy.json

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

cloud_list_activities 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 MCP ClickHouse — 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

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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 cloud_list_activities

What does the cloud_list_activities tool do? +

List organization activities (audit log). It is categorised as a Read tool in the MCP ClickHouse MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on cloud_list_activities? +

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

What risk level is cloud_list_activities? +

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

Can I rate-limit cloud_list_activities? +

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

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

cloud_list_activities is provided by the MCP ClickHouse MCP server (oualib/chmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP ClickHouse tool call.

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

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