create_postgres_database · CloudNativePG MCP Server MCP

WHAT IT DOES

What create_postgres_database does on CloudNativePG MCP Server

AI agents use create_postgres_database to create or update resources in CloudNativePG MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CloudNativePG MCP Server environment.

WHY IT NEEDS A POLICY

Why create_postgres_database needs a policy

Creating a database is a reversible write operation that modifies cluster configuration and state. It does not irreversibly delete data (not Destructive), does not execute arbitrary code (not Execute), and does not involve financial transactions (not Financial). However, it has high severity because an LLM agent could create many databases consuming resources, potentially impacting cluster stability and availability.

From the tool's definition Tool name is 'create_postgres_database' and description states 'Create a new database using Database CRD' — this creates new data structures and modifies cluster state by adding a database resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_postgres_database Rate-limited

create_postgres_database 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches CloudNativePG MCP Server, so you can run agents against it safely.

FAQ

Questions about create_postgres_database

What does the create_postgres_database tool do? +

Create a new database using Database CRD. It is categorised as a Write tool in the CloudNativePG MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_postgres_database? +

Register the CloudNativePG MCP Server MCP server in PolicyLayer and add a rule for create_postgres_database: 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 CloudNativePG MCP Server. Nothing to install.

What risk level is create_postgres_database? +

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

Can I rate-limit create_postgres_database? +

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

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

create_postgres_database is provided by the CloudNativePG MCP Server MCP server (wateim/cnpg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.