Revoke permissions from a user
AI agents call revoke_permissions to permanently remove resources in PostgreSQL MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Revoking permissions is a destructive action because it permanently removes user access controls and database privileges. While technically reversible (via grant), the operation itself is destructive in nature as it eliminates access rights that may be difficult to restore if not tracked.
From the tool's definition 'Revoke permissions from a user' — this irreversibly removes access rights and cannot be undone without re-granting them, making it a destructive permission modification. It alters database security state in a way that is not easily reversible.
Attacks that exploit this kind of access
Revoke permissions from a user. It is categorised as a Destructive tool in the PostgreSQL MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for revoke_permissions: 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.
revoke_permissions is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the revoke_permissions 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 revoke_permissions. 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.
revoke_permissions is provided by the PostgreSQL MCP Server MCP server (reckersai/mcpg). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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