Analyze query plan cache statistics from pg_stat_statements if available.
AI agents call PostgreSQL_query_plan_cache 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 tool retrieves and analyzes existing statistical metadata about query plans from PostgreSQL's built-in monitoring system. It performs passive observation of the database state with no side effects, reversible actions, or external command execution. Misuse would have minimal security impact — an AI agent can only over-read diagnostic data, not modify or destroy anything.
From the tool's definition Tool description states it 'Analyze query plan cache statistics from pg_stat_statements' — a read-only operation that queries the PostgreSQL statistics view pg_stat_statements to retrieve diagnostic information.
Documented attack patterns abuse exactly the kind of access PostgreSQL_query_plan_cache 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_query_plan_cache:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_query_plan_cache": {}
}
}PostgreSQL_query_plan_cache is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Analyze query plan cache statistics from pg_stat_statements if available. 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_query_plan_cache: 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_query_plan_cache 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_query_plan_cache 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_query_plan_cache. 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_query_plan_cache 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.
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239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.