PostgreSQL_create_user
A write tool on the Postgres MCP server.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-create-user.md
What PostgreSQL_create_user does on Postgres
AI agents use PostgreSQL_create_user to create or update resources in Postgres, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Postgres environment.
Why PostgreSQL_create_user is rated Medium
Creating a user is a reversible Write operation—new user accounts can be deleted or modified. However, severity is elevated to 'high' because creating unauthorized database users could grant access to sensitive data, enable privilege escalation, or facilitate lateral movement within a database system. The tool affects database security posture materially.
From the tool's definition Tool name 'PostgreSQL_create_user' indicates creation of a database user account. Description is empty, but the name and server context (PostgreSQL database management) make the intent clear.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_create_user safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Postgres, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For PostgreSQL_create_user, this is the rule to start with:
PostgreSQL_create_user 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Postgres, apply this rule, and every PostgreSQL_create_user call is checked against it from then on.
Questions about PostgreSQL_create_user
PostgreSQL_create_user is a write tool on the Postgres MCP server. It is categorised as a Write tool in the Postgres MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_create_user: 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.
PostgreSQL_create_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the PostgreSQL_create_user 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.
Set action: deny in the PolicyLayer policy for PostgreSQL_create_user. 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.
PostgreSQL_create_user 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.
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