postgres_query

Run a PostgreSQL query as postgres.

SERVERMcp Control Plane SOURCEalbertik322-sudo/mcp-control-plane

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-control-plane/postgres-query.md

WHAT IT DOES

What postgres_query does on Mcp Control Plane

AI agents invoke postgres_query to trigger actions in Mcp Control Plane. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why postgres_query is rated High

This tool runs arbitrary SQL queries with superuser (postgres) privileges. It spans Execute, Destructive (DROP/DELETE/TRUNCATE), and potentially Financial categories depending on the database contents. Since it permits arbitrary SQL as a superuser, it is at minimum Execute with Destructive potential, making it critical severity. An AI agent could issue DROP TABLE, DELETE FROM, or exfiltrate sensitive data.

From the tool's definition 'Run a PostgreSQL query as postgres' — executes arbitrary SQL as the superuser postgres account

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs postgres_query safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Control Plane, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For postgres_query, this is the rule to start with:

postgres_query Rate-limited

postgres_query stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "postgres_query": {
      "limits": [
        {
          "counter": "postgres_query_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Control Plane, apply this rule, and every postgres_query call is checked against it from then on.

FAQ

Questions about postgres_query

What does the postgres_query tool do? +

Run a PostgreSQL query as postgres. It is categorised as a Execute tool in the Mcp Control Plane MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on postgres_query? +

Register the Mcp Control Plane MCP server in PolicyLayer and add a rule for postgres_query: 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 Control Plane. Nothing to install.

What risk level is postgres_query? +

postgres_query is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit postgres_query? +

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

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

postgres_query is provided by the Mcp Control Plane MCP server (albertik322-sudo/mcp-control-plane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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