cloud_create_invitation

THE RISK

Medium Risk

Why cloud_create_invitation needs a policy

This tool creates a new invitation object in the ClickHouse Cloud organization, modifying the organization's state by adding an invitation record. This is reversible (invitations can be deleted, as evidenced by the sibling tool 'cloud_delete_invitation'), so it qualifies as Write rather than Destructive.

From the tool's definition Tool name 'cloud_create_invitation' and description 'Create an invitation to join the organization' indicate this creates a new record (invitation) in the system.

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

POLICY

How to control cloud_create_invitation

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_create_invitation:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cloud_create_invitation": {
      "limits": [
        {
          "counter": "cloud_create_invitation_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

cloud_create_invitation stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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.

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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 →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about cloud_create_invitation

What does the cloud_create_invitation tool do? +

Create an invitation to join the organization. It is categorised as a Write tool in the MCP ClickHouse MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on cloud_create_invitation? +

Register the MCP ClickHouse MCP server in PolicyLayer and add a rule for cloud_create_invitation: 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_create_invitation? +

cloud_create_invitation is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit cloud_create_invitation? +

Yes. Add a rate_limit block to the cloud_create_invitation 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_create_invitation completely? +

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

cloud_create_invitation 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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