pg_role_assign

Assign (grant) a role to a user/role, establishing role membership. Optionally with ADMIN OPTION to allow re-granting.

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-assign.md

WHAT IT DOES

What pg_role_assign does on PostgreSQL MCP Server

AI agents use pg_role_assign 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_assign is rated Medium

pg_role_assign creates or modifies role membership (a reversible change to database state) without destroying data. While it affects access control and could escalate privileges if misused, it is not irreversible (roles can be revoked) and does not execute arbitrary code or move money. This makes it Write rather than Execute or Destructive.

From the tool's definition Tool description: 'Assign (grant) a role to a user/role, establishing role membership. Optionally with ADMIN OPTION to allow re-granting.' This modifies access control by creating or altering role membership, which changes user permissions within the database.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pg_role_assign 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_assign, this is the rule to start with:

pg_role_assign Rate-limited

pg_role_assign 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_assign": {
      "limits": [
        {
          "counter": "pg_role_assign_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_assign call is checked against it from then on.

FAQ

Questions about pg_role_assign

What does the pg_role_assign tool do? +

Assign (grant) a role to a user/role, establishing role membership. Optionally with ADMIN OPTION to allow re-granting. 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_assign? +

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

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

Can I rate-limit pg_role_assign? +

Yes. Add a rate_limit block to the pg_role_assign 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_assign completely? +

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

pg_role_assign 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_assign does on PostgreSQL MCP Server

Why pg_role_assign is rated Medium

The rule that runs pg_role_assign safely

Questions about pg_role_assign

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