PostgreSQL_grant_privileges
A write tool on the Postgres MCP server.
This record as markdown: /tools/mukul975-postgres-mcp-server/postgresql-grant-privileges.md
What PostgreSQL_grant_privileges does on Postgres
AI agents use PostgreSQL_grant_privileges 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_grant_privileges is rated Medium
Granting privileges modifies access control settings in PostgreSQL, which is a write/modification operation. It is reversible (privileges can be revoked), but misuse could allow unauthorized users to gain elevated access to the database, making the blast radius high. The description is empty, so confidence is reduced, but the tool name strongly implies privilege assignment.
From the tool's definition Tool name 'PostgreSQL_grant_privileges' — the word 'grant' implies assigning permissions/privileges to database users or roles.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_grant_privileges 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_grant_privileges, this is the rule to start with:
PostgreSQL_grant_privileges 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_grant_privileges call is checked against it from then on.
Questions about PostgreSQL_grant_privileges
PostgreSQL_grant_privileges 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_grant_privileges: 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_grant_privileges 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_grant_privileges 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_grant_privileges. 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_grant_privileges 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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