pg_role_revoke

Revoke role membership from a user, or revoke specific privileges on objects from a role. For membership: provide role + user. For privileges: provide role + privileges + table/schema.

SERVERPostgreSQL MCP Server SOURCE@neverinfamous/postgres-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-role-revoke.md

WHAT IT DOES

What pg_role_revoke does on PostgreSQL MCP Server

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

RISK

Why pg_role_revoke is rated Medium

Revoking privileges or role membership is a reversible access control modification (grants can be re-issued), so it falls under Write rather than Destructive. However, the blast radius is high because misuse could strip critical permissions from users or roles, potentially breaking application access or escalating/de-escalating security boundaries across the database.

From the tool's definition Revoke role membership from a user, or revoke specific privileges on objects from a role

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_role_revoke safely

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

pg_role_revoke Rate-limited

pg_role_revoke 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": {
    "pg_role_revoke": {
      "limits": [
        {
          "counter": "pg_role_revoke_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_role_revoke call is checked against it from then on.

FAQ

Questions about pg_role_revoke

What does the pg_role_revoke tool do? +

Revoke role membership from a user, or revoke specific privileges on objects from a role. For membership: provide role + user. For privileges: provide role + privileges + table/schema. It is categorised as a Write tool in the PostgreSQL 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 pg_role_revoke? +

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

What risk level is pg_role_revoke? +

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

Can I rate-limit pg_role_revoke? +

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

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

pg_role_revoke is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

What pg_role_revoke does on PostgreSQL MCP Server

Why pg_role_revoke is rated Medium

The rule that runs pg_role_revoke safely

Questions about pg_role_revoke

More on PostgreSQL MCP Server, and thousands of servers like it.