Create a new PostgreSQL database instance
AI agents use create_postgresql_instance to create or update resources in Linode MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linode MCP Server environment.
Creating a PostgreSQL instance provisions cloud infrastructure and incurs costs, but the action is reversible via deletion. It does not execute arbitrary code, delete data irreversibly, or move money directly. The Write category applies because it creates/provisions a new managed resource.
From the tool's definition Tool name 'create_postgresql_instance' and description 'Create a new PostgreSQL database instance' indicate creation of a new database resource. This is a Write operation—it creates data/infrastructure but is reversible (the instance can be deleted).
Documented attack patterns abuse exactly the kind of access create_postgresql_instance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Linode MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_postgresql_instance:
{
"version": "1",
"default": "deny",
"tools": {
"create_postgresql_instance": {
"limits": [
{
"counter": "create_postgresql_instance_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_postgresql_instance 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.
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Create a new PostgreSQL database instance. It is categorised as a Write tool in the Linode MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Linode MCP Server MCP server in PolicyLayer and add a rule for create_postgresql_instance: 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 Linode MCP Server. Nothing to install.
create_postgresql_instance is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_postgresql_instance 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.
Set action: deny in the PolicyLayer policy for create_postgresql_instance. 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.
create_postgresql_instance is provided by the Linode MCP Server MCP server (takashito/linode-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Linode 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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416 Linode MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.