PostgreSQL_get_subscription_info

THE RISK

Low Risk

Why PostgreSQL_get_subscription_info needs a policy

This tool retrieves metadata about PostgreSQL logical replication subscriptions. It performs a read-only query to obtain subscription configuration and status information. There are no side effects, no data modifications, no code execution, and no irreversible operations. The blast radius of misuse is minimal—an attacker could only gain visibility into replication configuration, which is informational.

From the tool's definition Tool name contains 'get' and description states 'Get logical replication subscription information', indicating a retrieval operation without data modification.

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

POLICY

How to control PostgreSQL_get_subscription_info

PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_get_subscription_info:

policy.json

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

PostgreSQL_get_subscription_info 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 Postgres — 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

Read 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.
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 PostgreSQL_get_subscription_info

What does the PostgreSQL_get_subscription_info tool do? +

Get logical replication subscription information. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on PostgreSQL_get_subscription_info? +

Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_get_subscription_info: 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 Postgres. Nothing to install.

What risk level is PostgreSQL_get_subscription_info? +

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

Can I rate-limit PostgreSQL_get_subscription_info? +

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

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

PostgreSQL_get_subscription_info is provided by the Postgres MCP server (mukul975/postgres-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 Postgres tool call.

Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →