pg_drop_index
Drop an index from a table. Supports IF EXISTS, CASCADE, and CONCURRENTLY options.
This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-drop-index.md
What pg_drop_index does on PostgreSQL MCP Server
AI agents call pg_drop_index 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.
Why pg_drop_index is rated Critical
The DROP INDEX operation in PostgreSQL permanently removes an index from the database. While indexes can be recreated, the action itself is irreversible and destructive. Dropping an index without proper planning can severely degrade query performance or cause operational issues. The tool supports CASCADE semantics which could affect dependent objects, increasing the blast radius.
From the tool's definition Tool name 'pg_drop_index' and description 'Drop an index from a table' directly indicate irreversible deletion of a database index.
Attacks that exploit this kind of access
The rule that runs pg_drop_index 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_drop_index, this is the rule to start with:
pg_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 PostgreSQL MCP Server, apply this rule, and every pg_drop_index call is checked against it from then on.
Questions about pg_drop_index
Drop an index from a table. Supports IF EXISTS, CASCADE, and CONCURRENTLY options. 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 pg_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 PostgreSQL MCP Server. Nothing to install.
pg_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 pg_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 pg_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.
pg_drop_index 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.
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