pg_role_grant

Grant privileges (SELECT, INSERT, UPDATE, DELETE, ALL, etc.) on tables, schemas, sequences, or functions to a PostgreSQL role.

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-grant.md

WHAT IT DOES

What pg_role_grant does on PostgreSQL MCP Server

AI agents use pg_role_grant 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_grant is rated Medium

Granting privileges modifies access control permissions in the database. This is a Write operation (modifying security configuration) rather than Destructive since it is reversible via REVOKE. However, severity is high because misuse could allow an AI agent to escalate privileges for a role, potentially granting ALL privileges on critical objects, leading to broad unauthorized data access or modification.

From the tool's definition Grant privileges (SELECT, INSERT, UPDATE, DELETE, ALL, etc.) on tables, schemas, sequences, or functions to a PostgreSQL role

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_role_grant 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_grant, this is the rule to start with:

pg_role_grant Rate-limited

pg_role_grant 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_grant": {
      "limits": [
        {
          "counter": "pg_role_grant_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_grant call is checked against it from then on.

FAQ

Questions about pg_role_grant

What does the pg_role_grant tool do? +

Grant privileges (SELECT, INSERT, UPDATE, DELETE, ALL, etc.) on tables, schemas, sequences, or functions to a PostgreSQL role. 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_grant? +

Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_role_grant: 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_grant? +

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

Can I rate-limit pg_role_grant? +

Yes. Add a rate_limit block to the pg_role_grant 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_grant completely? +

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

pg_role_grant 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_grant does on PostgreSQL MCP Server

Why pg_role_grant is rated Medium

The rule that runs pg_role_grant safely

Questions about pg_role_grant

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