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What PostgreSQL_drop_index does on Postgres
AI agents call PostgreSQL_drop_index to permanently remove resources in Postgres, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why PostgreSQL_drop_index is rated Critical
Dropping an index is a destructive operation that cannot be undone without recreating it. While it doesn't delete data itself, it irreversibly removes database schema objects and can severely impact query performance if critical indexes are dropped. This warrants the Destructive category and high severity due to potential operational impact.
From the tool's definition Tool name explicitly contains 'drop_index' and description states 'Drop an index.' The DROP command in PostgreSQL is irreversible and permanently removes the index from the database.
Attacks that exploit this kind of access
The rule that runs PostgreSQL_drop_index 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_drop_index, this is the rule to start with:
PostgreSQL_drop_index is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Postgres, apply this rule, and every PostgreSQL_drop_index call is checked against it from then on.
Questions about PostgreSQL_drop_index
Drop an index. It is categorised as a Destructive tool in the Postgres MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_drop_index: 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_drop_index 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 PostgreSQL_drop_index 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_drop_index. 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_drop_index 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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