Detect tables with inefficient vacuuming based on dead tuple ratio.
AI agents call PostgreSQL_get_vacuum_inefficiency_tables to retrieve information from Postgres without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a diagnostic Read operation. It retrieves and analyzes vacuum efficiency metrics from PostgreSQL system catalogs to identify problematic tables. It performs no write operations, executes no user code, deletes nothing, and has no financial implications. The low severity reflects that misuse would only expose database performance information, not enable harm.
From the tool's definition Tool name includes 'get' and description states 'Detect tables with inefficient vacuuming based on dead tuple ratio' — purely diagnostic query operation that retrieves and analyzes existing database metrics without modifying, executing on, or deleting data.
Documented attack patterns abuse exactly the kind of access PostgreSQL_get_vacuum_inefficiency_tables gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_get_vacuum_inefficiency_tables:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_get_vacuum_inefficiency_tables": {}
}
}PostgreSQL_get_vacuum_inefficiency_tables is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Detect tables with inefficient vacuuming based on dead tuple ratio. It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_get_vacuum_inefficiency_tables: 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_get_vacuum_inefficiency_tables is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the PostgreSQL_get_vacuum_inefficiency_tables 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_get_vacuum_inefficiency_tables. 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_get_vacuum_inefficiency_tables 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.
Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.