cloud_update_service_state

THE RISK

High Risk

Why cloud_update_service_state needs a policy

This tool executes a lifecycle operation (start/stop) on a ClickHouse Cloud service. It is not merely a data read or write; it triggers an external system operation. Misuse could cause service outages (stopping a production service) or unexpected costs (starting idle services), making severity high.

From the tool's definition 'Start or stop a service' — triggers an operational state change on a cloud infrastructure service

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

POLICY

How to control cloud_update_service_state

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_update_service_state:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cloud_update_service_state": {
      "limits": [
        {
          "counter": "cloud_update_service_state_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

cloud_update_service_state stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP ClickHouse tools

Destructive cloud_delete_api_key Delete an API key. Destructive cloud_delete_clickpipe Delete a ClickPipe. Destructive cloud_delete_invitation Delete/cancel an invitation. Destructive cloud_delete_query_endpoint_config Delete query endpoint configuration for a service (experimental). Destructive cloud_delete_reverse_private_endpoint Delete a reverse private endpoint (beta). Destructive cloud_delete_service Delete a service (must be stopped first). Destructive cloud_remove_member Remove a member from the organization. Execute run_query Run a query in a ClickHouse database.

All 55 MCP ClickHouse tools →

Execute tools on other servers

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Go deeper

High-risk tools in MCP ClickHouse → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about cloud_update_service_state

What does the cloud_update_service_state tool do? +

Start or stop a service. It is categorised as a Execute tool in the MCP ClickHouse MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cloud_update_service_state? +

Register the MCP ClickHouse MCP server in PolicyLayer and add a rule for cloud_update_service_state: 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_update_service_state? +

cloud_update_service_state is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cloud_update_service_state? +

Yes. Add a rate_limit block to the cloud_update_service_state 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_update_service_state completely? +

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

cloud_update_service_state 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.

CHECK YOUR STACK →