get_postgresql_instance

THE RISK

Low Risk

Why get_postgresql_instance needs a policy

This tool retrieves information about an existing PostgreSQL database instance. It performs a query operation to fetch metadata or configuration details, which is a read-only action. There is no capability to modify, delete, execute code, or trigger financial actions. The blast radius of misuse is minimal - an attacker could learn about database configurations but cannot alter or damage resources.

From the tool's definition Tool name is 'get_postgresql_instance' and description states 'Get details for a specific PostgreSQL database instance' - the verb 'Get' and action 'details' indicate data retrieval with no modification or side effects.

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

POLICY

How to control get_postgresql_instance

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 get_postgresql_instance:

policy.json

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

get_postgresql_instance 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 Linode MCP Server — 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

More Linode MCP Server tools

Destructive cancel_account Cancel your account Destructive cancel_backups Cancel backups for a Linode instance Destructive cancel_object_storage Cancel Object Storage service Destructive delete_alert_definition Delete an alert definition Destructive delete_api_token Delete an API token Destructive delete_config_interface Delete an interface from a configuration profile Destructive delete_domain Delete a domain Destructive delete_domain_record Delete a domain record

All 416 Linode MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

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 get_postgresql_instance

What does the get_postgresql_instance tool do? +

Get details for a specific PostgreSQL database instance. It is categorised as a Read tool in the Linode MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_postgresql_instance? +

Register the Linode MCP Server MCP server in PolicyLayer and add a rule for get_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.

What risk level is get_postgresql_instance? +

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

Can I rate-limit get_postgresql_instance? +

Yes. Add a rate_limit block to the get_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.

How do I block get_postgresql_instance completely? +

Set action: deny in the PolicyLayer policy for get_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.

What MCP server provides get_postgresql_instance? +

get_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.

Enforce policy on every Linode MCP Server tool call.

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.

CHECK YOUR STACK →